Class 9

Balbharti Maharashtra State Board Class 9 Science Solutions Chapter 5 Acids, Bases and Salts Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 9 Science Solutions Chapter 5 Acids, Bases and Salts

Class 9 Science Chapter 5 Acids, Bases and Salts Textbook Questions and Answers

1. Identify the odd one out and justify.

(a) Chloride, nitrate, hydride, ammonium
Answer:
Ammonium is the odd one out as it is a basic radical and rest all are acidic radicals. Generally, basic radicals are formed by the removal of electrons from the atom of metals such as Na⁺, Cu²⁺. But there are some exceptions, such as NH₄⁺.

(b) Hydrogen chloride, sodium hydroxide, calcium oxide, ammonia
Answer:
Hydrogen chloride is the odd one out. It is acidic and rest all are basic.

(c) Acetic acid, carbonic acid, hydrochloric acid, nitric acid
Answer:
Carbonic acid is the odd one out. It is a dibasic acid and rest are all monobasic acids.

(d) Ammonium chloride, sodium chloride, potassium nitrate, sodium sulphate
Answer:
Ammonium chloride is the odd one out, as it is made up of a strong acid and weak base and rest all are formed from strong acid and strong base.

(e) Sodium nitrate, sodium carbonate, sodium sulphate, sodium chloride
Answer:
Sodium carbonate is the odd one out, as it is made up of a weak acid and strong base, and rest all are formed from strong acid and strong base.

(f) Calcium oxide, magnesium oxide, zinc oxide, sodium oxide.
Answer:
Zinc oxide is the odd one out, as it is an amphoteric oxide, and rest all are basic oxides.

(g) Crystalline blue vitriol, crystalline common salt, crystalline ferrous sulphate, crystalline sodium carbonate.
Answer:
Crystalline common salt is the odd one out, as it does not contain water of crystallisation. It is an ionic compound and ionic compounds are crystalline in nature and rest all have their crystalline structure because of their water of crystallization.

(h) Sodium chloride, potassium hydroxide, acetic acid, sodium acetate.
Answer:
Acetic acid is the odd one out. It is an acid, the rest are all salts.

2. Write down the changes that will be seen in each instance and explain the reason behind it.

(a) 50ml water is added to 50ml solution of copper sulphate.

Answer:

• Copper sulphate solution is blue. It is a concentrated solution.
• When 50 ml of water is added to this concentrated solution, it becomes a diluted solution.
• The intensity of the blue colour is now different in this homogenous mixture.

(b) Two drops of the indicator phenolphthalein were added to 10ml solution of sodium hydroxide.

Answer:

• Sodiumhy droxide is a base and phenolphthalein is a synthetic indicator.
• Sodium hydroxide solution will turn pink if phenolphthalein is added to it.
• It is a test for identifying bases.

(c) Two or three filings of copper were added to 10ml dilute nitric acid and stirred.
Answer:
When copper metal reacts with dilute nitric acid, the metal does not displace hydrogen from the acid like reaction with other metals. Instead the reaction produces nitric oxide, (NO).

(d) A litmus paper was dropped into 2ml dilute HCl. Then 2ml concentrated NaOH was added to it and stirred.
Answer:
Blue litmus Paper:

• HCl is hydrochloric acid, so the blue litmus turns red.
• When equal amount of NaOH is added the colour again changes to blue and remains the same.

Red litmus paper:

• Red litmus paper shows no colour change in hydrochloric acid.
• When some amount of NaOH is added the colour changes to blue initially but when the amount of NaOH is sufficient the blue colour dissappears.
• Equal amounts of HC1 and NaOH results in the formation of NaCl, a salt, and the solvent water. This reaction is called the neutralization reaction.

(e) Magnesium oxide was added to dilute HCl and magnesium oxide was a added to dilute NaOH.
Answer:
(i) Magnesium oxide + dil HCl.
This is a neutralization reaction. Magnesium oxide is an insoluble base, it reacts with dilute HCl to produce a soluble salt MgCl₂ and water H₂O.
\(\mathrm{MgO}_{(\mathrm{s})}+2 \mathrm{HCl}_{(\mathrm{aq})} \longrightarrow \mathrm{MgCl}_{2(\mathrm{aq})}+\mathrm{H}_{2} \mathrm{O}_{(n)}\)

(ii) Magnesium oxide + NaOH.
No chemical reaction takes place between magnesium oxide and sodium hydroxide.

(f) Zinc oxide was added to dilute HCl and zinc oxide was added to dilute NaOH.
Answer:

• Zinc oxide reacts with dilute hydrochloric acid to form zinc chloride and water. It is a neutralization reaction.
  \(\mathrm{ZnO}_{(\mathrm{s})}+2 \mathrm{HCl}_{(\mathrm{aq})} \longrightarrow \mathrm{ZnCl}_{2(\mathrm{aq})}+\mathrm{H}_{2} \mathrm{O}_{(\mathrm{l})}\)
• Zinc oxide reacts with sodium hydroxide to form sodium zincate and water.
  \(\mathrm{ZnO}_{(\mathrm{s})}+2 \mathrm{NaOH}_{(\mathrm{aq})} \longrightarrow \mathrm{Na}_{2} \mathrm{ZnO}_{2(\mathrm{aq})}+\mathrm{H}_{2} \mathrm{O}_{(\mathrm{t})}\)

(g) Dilute HCl was added to limestone.
Answer:

• When hydrochloric acid is added to limestone, carbon dioxide is liberated. Limestone is calcium carbonate.
  CaCO₃ + 2 HCl → CaCl₂ + CO₂ + H₂O
• Carbon dioxide is prepared in the laboratory using these chemicals.

(h) Pieces of blue vitriol were heated in a test tube. On cooling, water was added to it.
Answer:

• On heating, the crystalline structure of blue vitriol breaks down to form a colourless powder and water is released.
• This water is part of the crystal structure of blue vitriol.
• It is called water of crystallization.
• On adding water to the white powder, a solution was formed which has the same colour as the copper sulphate salt solution.

(i) Dilute H₂SO₄ was taken in an electrolytic cell and electric current was passed through it.
Answer:

• If pure water is used in the electrolytic cell, current does not flow even on putting on the switch.
• Pure water is a bad conductor of electricity. Dilute H₂SO₄ is acidulated water.
• The electrical conductivity of water increases on mixing with strong acid or base in it due to their dissociation and electrolysis of water takes place.
• H₂SO₄ is fully dissociated in aqueous solution. \(\mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow 2 \mathrm{H}^{+}+\mathrm{SO}_{4}^{2-}\)
• H₂O is a weak electrolyte and is only slightly dissociated \(\mathrm{H}_{2} \mathrm{O} \longrightarrow \mathrm{H}^{+}+\mathrm{OH}^{-}\)
• During electrolysis, the hydrogen ions migrate towards the cathode and are discharged there.

[H+ ions gains electrons and are converted to hydrogen gas]
\(2 \mathrm{H}^{+}+2 \mathrm{e}^{-} \longrightarrow \mathrm{H}_{2(\mathrm{~g})}\)
Cathode reaction:
\(2 \mathrm{H}_{2} \mathrm{O}_{(\mathrm{i})}+2 \mathrm{e}^{-} \longrightarrow \mathrm{H}_{2(\mathrm{~g})}+2 \mathrm{OH}_{(\mathrm{aq})}^{-}\)
Anode reaction:
\(2 \mathrm{H}_{2} \mathrm{O}_{(\mathrm{l})} \longrightarrow \mathrm{O}_{2(\mathrm{~g})}+4 \mathrm{H}_{(\mathrm{aq})}^{+}+4 \mathrm{e}\)

• For every hydrogen ion discharged at the anode, another hydrogen ion is formed at the cathode.
• The net result is that the concentration of the sulphuric acid remains constant and electrolysis of water is overall reaction. \(2 \mathrm{H}_{2} \mathrm{O} \longrightarrow 2 \mathrm{H}_{2}+\mathrm{O}_{2}\)
• The volume of the hydrogen gas formed near the cathode is double that of the oxygen gas formed near the anode.

3. Classify the following oxides into three types and name the types.
CaO, MgO, CO₂, SO₃, Na₂O, ZnO, Al₂O₃, Fe₂O₃
Answer:
There are three types of oxides : Basic oxides, Acidic oxides and Amphoteric oxides.

Generally metal oxides are basic in nature.
Exception : Al₂O₃ and ZnO are amphoteric oxides.
Generally non-metal oxides are acidic in nature.

4. Explain by drawing a figure of the electronic configuration.

a. Formation of sodium chloride from sodium and chlorine.
Answer:

b. Formation of a magnesium chloride from magnesium and chlorine.
Answer:

5. Show the dissociation of the following compounds on dissolving in water, with the help of chemical equation and write whether the proportion of dissociation is small or large.
Hydrochloric acid, Sodium chloride, Potassium hydroxide, Ammonia, Acetic acid, Magnesium chloride, Copper sulphate.
Answer:
(a) Hydrochloric acid (HCl)

• \(\mathrm{HCl}_{(g)} \frac{\text { Water }}{\text { dissociation }}>\mathrm{H}_{(\mathrm{aq})}^{+}+\mathrm{Cl}_{(\mathrm{aq})}^{-}\)
• Hydrochloric acid is a strong acid, as on dissolving in water, it dissociates almost completely and the resulting aqueous solution contains mainly H ions and the concerned acidic radical.
• The proportion of dissociation is large.

(b) Sodium chloride (NaC1)

• \(\mathrm{NaCl}_{(s)} \frac{\text { Water }}{\text { dissociation }}>\mathrm{Na}_{(\mathrm{aq})}^{+}+\mathrm{Cl}_{\text {(aq) }}^{-}\)
• When an ionic compound begins to dissolve in water, the water molecules push themselves in between the positive and negative ions of the compound and separate them from each other.
• The proportion of dissociation is large.

(c) Potassium hydroxide (KOH)

• \(\mathrm{KOH}_{(n)} \frac{\text { Water }}{\text { dissociation }} \mathrm{K}_{(\mathrm{aq})}^{+}+\mathrm{OH}_{(\mathrm{aq})}\)
• Potassium hydroxide is a strong base, as on dissolving in water, it dissociates almost completely and the resulting aqueous solution contains mainly OH⁺ ions and the concerned basic radical.
• The proportion of dissociation is large.

(d) Ammonia (NH₃)
(i) \(\mathrm{NH}_{3(\mathrm{~g})}+\mathrm{H}_{2} \mathrm{O}_{(\mathrm{n}}-\frac{\text { Water }}{\text { uissociation }}>\mathrm{NH}_{4 \text { (aq) }}^{+}+\mathrm{OH}_{\text {(aq) }}^{-}\)
(ii) Ammonia dissolves in water to form NH₄OH (ammonium hydroxide). NH₄OH does not dissociate completely as it is a weak base. The aqueous solution contains a small proportion of OH^– ions and the concerned basic radical along with a large proportion of undissociated molecules of the base i.e. NH₄OH.
(iii) The proportion of dissociation is small.

(e) Acetic acid (CH₃COOH)

• \(\mathrm{CH}_{3} \mathrm{COOH}_{(l)} \frac{\text { Water }}{\text { dissociation }} \mathrm{CH}_{3} \mathrm{COO}_{(\text {aq) }}+\mathrm{H}_{(a z)}+{ }^{+}\)
• Acetic acid is a weak acid, on dissolving in water it does not dissociate completely, and the resulting aqueous solution contains H⁺ ion and the concerned acidic radical in small proportion along with large proportion of the undissociated molecules of the acid.
• The proportion of dissociation is small.

(f) Magnesium chloride (MgCl₂)

• \(\mathrm{MgCl}_{2(\mathrm{~s})} \frac{\text { Water }}{\text { dissociation }}>\mathrm{Mg}^{2+} \text { (aq) }+2 \mathrm{Cl}^{-} \text {(aq) }\)
• Magnesium chloride dissolves in water and forms magnesium ions and chloride ions. When an ionic compound begins to dissolve in water, the water molecules push themselves in between the ions of the compound and separate them from each other.
• The proportion of dissociation is large.

(g) Copper sulphate (CuSO₄)

• \(\mathrm{CuSO}_{4(s)} \frac{\text { Water }}{\text { dissociation }}>\mathrm{Cu}_{(\mathrm{aq})}^{2+}+\mathrm{SO}_{4}^{2-}\)
• When Copper sulphate is dissolved in water it forms copper ions and sulphate ions. When an ionic compound begins to dissolve in water, water molecules push themselves in between the ions of the compound and separate them from each other.
• The proportion of dissociation is large.

6. Write down the concentration of each of the following solutions in g/L and mol/L.

a. 7.3g HCl in 100ml solution
b. 2g NaOH in 50ml solution
c. 3g CH₃COOH in 100ml solution
d. 4.9g H₂SO₄ in 200ml solution
Answer:
To find : The concentration in g/L.
Solution:

7. Obtain a sample of rainwater. Add to it a few drops of universal indicator. Meausre its pH. Describe the nature of the sample of rainwater and explain the effect if it has on the living world.
Answer:

• pH of rain water is 6.5 that means rain water is slightly acidic.
• When we add universal indicator to rain water it turns orangish red, indicating pH value is between 0 to 7, which tells us that rain water is acidic in nature.
• Most of the plants grow best when pH of soil is close to 7. If the soil is too acidic or too basic, it affects plant growth.

8. Answer the following questions.

a. Classify the acids according to their basicity and give one example of each type.
Answer:

• Basicity of acids : The number of H⁺ ions obtainable by the dissociation of one molecule of an acid is called its basicity. The acids are classified as monobasic, dibasic and tribasic acids based on the number of H⁺ ions present.
• Examples of monobasic acid : HCl, HNO₃, CH₃COOH
• Examples of dibasic acid: H₂SO₄, H₂CO₃
• Examples of tribasic acid: H₃BO₃, H₃PO₄

b. What is meant by neutralization? Give two examples from everyday life of the neutralization reaction.
Answer:

• In neutralization reaction, an acid reacts with a base to form salt and water.
• In a neutralisation reaction the acid dissociates to form H⁺ ions and base dissociates to form OH ions.
• They combine to form H₂O molecules which mixes with the solvent.

Examples in daily life:

• When people suffer from acidity, they take some antacids to neutralise the acid in their stomach.
• If an ant stings us the pain is due to formic acid. It is neutralised by rubbing moist baking soda which is basic in nature.

c. Explain what is meant by electrolysis of water. Write the electrode reactions and explain them.
Answer:
Electrolysis of water:

• Electrolysis of water is the decomposition of water into oxygen and hydrogen gas due to an electric current being passed through acidified water.
• Cathode reaction:
  \(2 \mathrm{H}_{2} \mathrm{O}_{(l)}+2 \mathrm{e}^{-} \longrightarrow \mathrm{H}_{2(\mathrm{~g})}+2 \mathrm{OH}_{(\mathrm{aq}}\)
• Anode reaction:
  \(2 \mathrm{H}_{2} \mathrm{O}_{(l)} \longrightarrow \mathrm{O}_{2(\mathrm{~g})}+4 \mathrm{H}_{(\mathrm{aq})}^{+}+4 \mathrm{e}^{-}\)
• It is found that the volume of gas formed near the cathode is double that of the gas formed near the anode.
• Hydrogen gas is formed near the cathode and oxygen gas near the anode.
• From this, it is clear that electrolysis of water has taken place and its constituent element have been released.

9. Give a reason for the following.

a. Hydronium ions are always in the form H₃O⁺.
Answer:

• Acids in water gives H⁺ ions. These H⁺ ions do not exist freely in water.
• This is because H⁺ is a single proton, a hydrogen atom has only one proton and one electron.
• If the electron is removed to make H⁺, all that is left is an extremely tiny positively charged nucleus.
• This H ion will immediately combine with the surrounding water (H₂O) molecules to form (H₃O₄) hydronium ion.

b. Buttermilk spoils if kept in a copper or brass container.
Answer:

• Buttermilk contains an organic acid called as lactic acid.
• The lactic acid reacts with copper and brass and forms toxic compounds which are not fit for consumption.
• They are harmful and may cause food poisoning.
• So it is not advisable to keep buttermilk in brass or copper containers.

10. Write the chemical equations for the following activities.

(a) NaOH solution was added to HCl solution.
Answer:
When NaOH reacts with HCl, it gives NaCl and water.

(b) Zinc dust was added to dilute H₂SO₄.
Answer:
When zinc reacts with dilute sulphuric acid, it forms zinc sulphate and hydrogen gas is liberted.

(c) Dilute nitric acid was added to calcium oxide.
Answer:
When dilute nitric acid reacts with calcium oxide, it forms calcium nitrate and water.

(e) Carbon dioxide gas was passed through KOH solution.

(f) Dilute HCl was poured on baking soda.

11. State the differences.

a. Acids and bases
Answer:

b. Cation and anion
Answer:

c. the Negative electrode and the positive electrode.

Answer:

12. Classify aqueous solutions of the following substances according to their pH into three groups : 7, more than 7, less than 7.

Common salt, sodium acetate, hydrochloric acid, carbon dioxide, potassium bromide, calcium hydroxide, ammonium chloride, vinegar, sodium carbonate, ammonia, sulphur dioxide.
Answer:

Class 9 Science Chapter 5 Acids, Bases and Salts Intext Questions and Answers

Question 1.
How are the following substances classified into three groups with the help of litmus?
Lemon, tamarind, baking soda, buttermilk, vinegar, orange, milk, lime, tomato, milk of magnesia, water, alum.
Answer:

Question 2.
Fill in the columns in the part of the following table:
Answer:

Question 3.
Complete the following table of the concentration of various aqueous solutions.
Answer:

Question 4.
Complete the following table of neutralization reactions and also write down the names of the acids, bases and salts in it.
Answer:

Question 5.
What are the names of the following compounds? NH₃, Na₂O, CaO.
Answer:
NH₃ : Ammonia
Na₂O : Sodium oxide
CaO : Calcium oxide

Question 6.
Into which type will you classify the above compounds, acid, base or salt?
Answer:
NH₃ : base
Na₂O : base
CaO : base

Question 7.
ive examples of monobasic, dibasic and tribasic acids.
Answer:
Monobasic acid examples: HNO₃, HCl, CH₃COOH
Dibasic acid examples: H₂SO₄, H₂CO₃
Tribasic acid examples: H₃BO₃, H₃PO₄

Question 8.
Give the three types of bases with their examples.
Answer:
Types of bases:
Monoacidic base examples : NaOH, KOH, NH₄OH
Diacidic base examples: Ca(OH)₂, Ba(OH)₂
Triacidic base examples: A(OH)₃, Fe(OH)₃

Question 9.
What are the colours of the following natural and synthetic indicators in acidic and basic solutions? Litmus, turmeric, jamun, methyl orange, phenolphthalein?
Answer:

Question 10.
On mixing the substances as shown here, what are the resulting mixtures formed by mixing the following substances called?
(a) Water and salt
(b) Water and sugar
(c) Water and sand
(d) Water and sawdust
Answer:
(a) Water and salt – Homogeneous mixture
(b) Water and sugar – Homogeneous mixture
(c) Water and sand – Heterogeneous mixture
(d) Water and sawdust – Heterogeneous mixture

Question 11.
What would be the definition of an acid and a base with reference to the neutralization reaction?
Answer:

• Acid: An acid is a substance which neutralises a base to form salt and water.
• Base: A base is a substance which neutralises an acid to form salt and water.

Answer the following questions:

Question 1.
Take aqueous solution of sodium chloride, copper sulphate, glucose, urea, dil.H₂SO₄ and dil.NaOH in a beaker and test the electrical conductivity of the solutions. Answer the given below questions.

(a) With which solutions did the bulb glow?
Answer:
Solutions with which bulb glows: Aqueous solution of NaCl, CuSO₄, H₂SO₄ and NaOH.

(b) Which solutions are electrical conductors?
Answer:
Solutions which are electrical conductors:
NaCl, CuSO₄, H₂SO₄ and NaOH.

Question 2.
During electrolysis of copper sulphate, if electric current is passed through the electrolytic cell for a long time, what change would be seen at the anode?
Answer:

• When electricity is passed for a long time through copper sulphate solution, the following reaction is seen at the anode: Anode Reaction: Cu(s) → Cu²⁺(aq) + 2e^–
• All the copper atoms will get converted into copper ions and get deposited on the cathode. This process continues till the copper anode exists.

Question 3.
Would water be a good conductor of electricity?
Answer:
Pure water is not a good conductor of electricity.

Answer the following questions:

Question 1.
(i) With which solutions did the bulb glow?
(ii) Which solutions are electrical conductors?

Answer:
(i) The bulbs glows when the wire are immersed in NaCl solution.
(ii)

Question 2.
What would be the definition of an acid and a base with reference to the neutralization reaction?
Answer:

• Acid: An acid is a substance which neutralises a base to form salt and water.
• Base: A base is a substance which neutralises an acid to form salt and water.

Question 3.
Dissolve 2g salt in 500ml pure water. Take 250 ml of this solution in a 500ml capacity beaker. Connect two electrical wires to the positive and negative terminals of a power supply. Remove the insulating cladding from about 2cm portions at the other ends of the wires. These are the two electrodes. Fill two test tubes upto the brim with the prepared dilute salt solution. Invert them on the electrodes without allowing any air to enter. Start the electric current under 6V potential difference from the power supply. Observe what happens in the test tubes after some time.
(a) Did you see the gas bubbles forming near the electrodes in the test tubes?
(b) Are these gases heavier or lighter than water?
(c) Are the volumes of the gases collected over the solution in the two test tubes the same or different?
(d) Test the solutions in the two test tubes with litmus paper, what do you see?
(e) Repeat the activity by using dilute H₂SO₄ as well as dilute NaOH as the electrolyte.
Answer:
(a) Yes, gas bubbles can be seen forming near the electrodes in the test tube.
(b) These gases are lighter than water.

(c) The volumes of gases collected over the solution in the two test tubes are different.
(d) The solution in the cathode turns red litmus blue while solution in anode turns blue litmus red.
(e) When the above experiment is repeated with dil H₂SO₄ and dil NaOH, Hydrogen gas is liberated at cathodes and oxygen gas is liberated at anode.

Answer the following questions:

Question 1.
Cut a lemon into two equal parts. Take the juice of each part into two separate beakers. Pour 10 ml of drinking water in one beaker and 20 ml in the second. Stir the solutions in both the beakers and taste them. Is there any difference in the tastes of the solutions in the two beakers? What is that difference?
Answer:

• In the above activity, the sour taste of the solutions is because of the solute, lemon juice in them.
• The quantity of the lemon juice is the same in both the solutions. Yet their tastes are different.
• The solution in the first beaker is more sour than the one in the second.
• Although the quantity of the solute is the same in both the solutions, the quantity of the solvent is different.
• Ratio of the quantity of the solute to the quantity of the resulting solution is different. This ratio is larger for the solution in the first beaker and therefore that solution tastes more sour.
• On the other hand, the proportion of the lemon juice in the total solution in the second beaker is smaller and taste is less sour.
• The taste of foodstuff depends upon the nature of the taste-giving ingredient and its proportions in the foodstuff.
• Similarly, all the properties of a solution depend on the nature of the solute and solvent and also on the proportion of the solute in a solution
• The proportions of a solute in a solution is called the concentration of the solute in the solution.

Question 2.
Take a big test tube. Choose a rubber stopper in which a gas tube can be fitted. Take a few pieces of magnesium ribbon in the test tube and add some dilute HCl to it. Take a lighted candle near the end of the gas tube and observe. What did you observe?

Answer:

• Magnesium metal reacts with dilute HCl and an inflammable gas, hydrogen, is formed.
• During this reaction, the reactive metal displaces hydrogen from the acid to release hydrogen gas.
• At the same time, the metal is converted into basic radical which combines with the acidic radical from the acid to form the salt.
  \(\mathrm{Mg}_{(\mathrm{s})}+2 \mathrm{HCl}_{(\mathrm{aq}) \longrightarrow} \underset{\rightarrow}{\mathrm{MgCl}_{2(\mathrm{aq})}}+\mathrm{H}_{2(\mathrm{~g})}\)

Question 3.
Take some water in a test tube and add a little red oxide (the primer used before painting iron articles) to it. Now add a small quantity of dilute HCl to it, shake the test tube and observe.
(a) Does the red oxide dissolve in water?
(b) What change takes place in the particles of red oxide on adding dilute HCl?
Answer:
(a) The chemical formula of red oxide is Fe₂O₃. It is insoluble in water.
(b) The water-insoluble red oxide reacts with HCl to produce a water-soluble salt FeCl₃.

• This gives a yellowish colour to the water.
• The following chemical equation can be written for this chemical change.
  \(\mathrm{Fe}_{2} \mathrm{O}_{3(\mathrm{~s})}+6 \mathrm{HCl}_{(\mathrm{aq})} \longrightarrow 2 \mathrm{FeCl}_{3(\mathrm{aq})}+3 \mathrm{H}_{2} \mathrm{O}_{(\mathrm{l})}\)

Question 4.
Fit a bent tube in a rubber cork. Take some lime water in a test tube and keep it handy. Take some baking soda in another test tube and add some lemon juice to it. Immediately fit the bent tube over it. Insert its other end into the lime water. Note down your observations of both the test tubes. Repeat the procedure using washing soda, vinegar and dilute HC1 properly. What do you see?
Answer:

• In this activity, when limewater comes in contact with the gas released in the form of an effervescence, it turns milky.
• This is a chemical test for carbon dioxide gas.
• When lime water turns milky, we infer that the effervescence is of CO₂.
• This gas is produced on the reaction of acids with carbonate and bicarbonate salts of metals.
• A precipitate of CaCO₃ is produced on its reaction with the lime water Ca(OH)₂.
• This reaction can be represented by the following chemical equation.
  \(\mathrm{Ca}(\mathrm{OH})_{2(\mathrm{aq})}+\mathrm{CO}_{2(\mathrm{~g})} \longrightarrow \mathrm{CaCO}_{3(\mathrm{~s})}+\mathrm{H}_{2} \mathrm{O}_{(\mathrm{l})}\)
• Washing soda is sodium carbonate Na2CO₃. It will react same as baking soda (NaHCO₃).
• Vinegar and HCl are acids, they do not react chemically with lemon juice.

Class 9 Science Chapter 5 Acids, Bases and Salts Additional Important Questions and Answers

Select the correct option

Question 1.
…………………. acid is present in lemon.
(a) malic acid
(b) tartaric acid
(c) citric acid
(d) butyric acid
Answer:
(c) Citric acid

Question 2.
Tamarind contains …………………. acid.
(a) Lactic acid
(b) tartaric acid
(c) matlic acid
(d) butyric acid
Answer:
(b) tartaric

Question 3.
Butter milk contains …………………. acid.
(a) butyric acid
(b) Lactic acid
(c) matlic acid
(d) citric acid
Answer:
(a) Butyricacid

Question 4.
If the basic radical is H+ the type of compound is ………………… .
(a) neutral
(b) base
(c) acid
(d) alkali
Answer:
(c) Acid

Question 5.
The name of compound NH3 is ………………… .
(a) nitric acid
(b) ammonium
(c) nitride
(d) ammonia
Answer:
(b) ammonia

Question 6.
The bases which are soluble in water are called as ………………… .
(a) indicators
(b) acids
(c) alkalis
(d) salts
Answer:
(c) alkalis

Question 7.
H₃PO₄ is a …………………. acid.
(a) monobasic
(b) tribasic
(c) tetrabasic
(d) dibasic
Answer:
(b) tribasic

Question 8.
According to pH scale pure water has a pH of ………………… .
(a) 6
(b) 7
(c) 5
(d) 8
Answer:
(b) 7

Question 9.
With reference to neutralization, metallic oxides are ………………… in nature.
(a) basic
(b) neutral
(c) acidic
(d) saline
Answer:
(a) basic

Question 10.
Molecular formula of blue vitriol is ………………… .
(a) CuSO₃ 5H₂O
(b) CuSO₄ 4H₂O
(c) CUSO₃ 4H₂O
(d) CUSO₄ 5H₂O
Answer:
(d) CUSO₄ 5H₂O

Question 11.
Molecular formula of crystalline alum is ………………… .
(a) KSO₄, AISO₄, 24H₂O
(b) K₂SO₄, ALSO₄, 24H₂O
(c) K₂SO₄, AL₂(SO₄)₃, 24H₂O
(d) KSO₄, Al₂(SO₄)₃, 24H₂O
Answer:
(c) K₂SO₄, AL₂(SO₄)₃, 24H₂O

Question 12.
Molecular formula for sodium oxide is ………………… .
(a) Na₂O
(b) NaO₂
(c) NaO
(d) Na₂O₂
Answer:
(a) Na₂O

Question 13.
H₂CO₃ is …………………. acid.
(a) monobasic
(b) dibasic
(c) tribasic
(d) tetrabasic
Answer:
(b) dibasic

Question 14.
Molecular formula of Red oxide is ………………… .
(a) Fe₂O₃
(b) CuO
(c) Fe₃O₄
(d) Na₂O
Answer:
(a) Fe₂O₃

Question 15.
The positive terminal electrode is called as ………………… .
(a) anode
(b) cathode
(c) anion
(d) cation
Answer:
(a) anode

Question 16.
…………………. produced in stomach helps in digestion.
(a) Hydrochloric acid
(b) Oxalic acid
(c) Sulphuric acid
(d) Nitric acid?
Answer:
(a) Hydrochloric acid

Question 17.
The solution turns blue litmus red, its pH is likely to be ………………… .
(a) 7
(b) 4
(c) 14
(d) 9
Answer:
(b) 4

Question 18.
An ionic compound NaCl is formed by ………………… .
(a) Na⁺ and Cl^–
(b) Na⁺ and Cl⁺
(c) Na^– and Cl^–
(d) Na^– and Cl⁺
Answer:
(a) Na⁺ and Cl^–

Question 19.
pH of strong acid is ………………… .
(a) 0
(b) 7
(c) 8
(d) 14
Answer:
(a) 0

Question 20.
HCl + NaOH → NaCl + H₂O is a …………………. reaction.
(a) neutralization
(b) crystallisation
(c) electrolysis
(d) dissociation
Answer:
(a) neutralization

Question 21.
Adding water to acid is an …………………. reaction.
(a) endothermic
(b) exothermic
(c) neutralisation
(d) crystallisation
Answer:
(b) exothermic

Find the odd one out:

(a) Rose Petal, Turmeric, Phenolphthalein, Indigo.
Answer:
Phenolphthalein is odd one out as rest are natural indicators while phenolphthalein is a synthetic indicator.

(b) Lime water, Vinegar, Acetic acid, Tartaric acid.
Answer:
Lime water is odd one out as this is basic in nature while rest are acidic.

(c) NaHCO₃, HCl, H₂SO₄, HNO₃
Answer:
NaHCO₃ is odd one out as it is base while rest are acids.

(d) Oxalic acid, Nitric acid, Citric acid, acetic acid.
Answer:
Nitric acid is odd one out as others are weak acids while Nitric acid is a strong acid.

(e) Crystalline, Liquid, Gases, Solid.
Answer:
Crystalline is odd one out as this is nature of a compound while others are physical states of compounds.

(f) Ca(OH)₂, Mg (OH)₂, NaOH, NH₄OH.
Answer:
NaOH is odd one out even though all are bases but NaOH is highly soluble in water compared to others.

Name the following:

Question 1.
Name the three types of ionic compounds.
Answer:
The three types of ionic compounds are acids, bases and salts.

Question 2.
Name the two constituents of molecule of an ionic compound.
Answer:

• Cation (positive ion/ basic radical)
• Anion (negative ion/acidic radical).

Question 3.
Name any three acids with their molecular formula.
Answer:

• Hydrochloric acid – HC1
• Sulphuric acid – H₂SO₄
• Nitric acid – HNO₃

Question 4.
Name any three bases with their molecular formula.
Answer:

• Sodium hydroxide – NaOH
• Potassium hydroxide – KOH
• Calcium hydroxide – Ca(OH)₂

Question 5.
Name any three salts with their molecular formula.
Answer:

• Sodium chloride – NaCl
• Potassium sulphate – K₂ SO₄
• Calcium chloride – CaCl₂

Question 6.
Name any two strong acids.
Answer:

• Hydrochloric acid – HC1
• Sulphuric acid – H₂ SO₄

Question 7.
Name any two weak acids.
Answer:

• Acetic acid – CH₃ COOH
• Carbonic acid – H₂ CO₃

Question 8.
Name any two strong bases.
Answer:

• Sodium hydroxide – NaOH
• Potassium hydroxide – KOH

Question 9.
Name a weak base.
Answer:
Ammonium hydroxide – NH₄OH

Question 10.
Name any two alkalis.
Answer:

• Sodium hydroxide – NaOH
• Potassium hydroxide – KOH

Question 11.
Name any two acids with their basicity 1 (monobasic)
Answer:

• Hydrochloric acid – HC1
• Nitric acid – HNO₃

Question 12.
Name any two acids with their basicity 2 (dibasic)
Answer:

• Sulphuric acid – H₂ SO₄
• Carbonic acid – H₂CO₃

Question 13.
Name any two acids with their basicity 3 (tribasic)
Answer:

• Boric acid – H₃BO₃
• Phosphoric acid – H₃PO₄

Question 14.
Name any two bases with their acidity 1 (monoacidic)
Answer:

• Sodium hydroxide – NaOH
• Potassium hydroxide – KOH

Question 15.
Name any two bases with their acidity 2 (diacidic)
Answer:

• Calcium hydroxide – Ca(OH)₂
• Barium hydroxide – Ba(OH)₂

Question 16.
Name any two bases with their acidity 3 (triacidic)
Answer:

• Aluminium hydroxide – Al(OH)₃
• Ferric hydroxide – Fe(OH)₃

Question 17.
Name the two units to express the concentration of the solution.
Answer:

• mass of solute in grams dissolved in one litre of the solution grams per litre, (g/L).
• Number of moles of the solute dissolved in one litre of the solution. Molarity (M) of the solution.

Match the columns:

Question 1.

Answer:
(1-d),
(2- c),
(3 – a),
(4 – b)

Question 2.

Answer:
(1-d),
(2- c),
(3 – a),
(4 – b)

Question 3.

Answer:
(1-d),
(2- c),
(3 – a),
(4 – b)

Question 4.

Answer:
(1 – b),
(2 – c),
(3 – d),
(4 – a)

Question 5.

Answer:
(1-c),
(2- a),
(3 – d),
(4 – b)

State whether the following statements are true or false and if false. Correct the false statement:

(1) The separation of H and CI in HCI is in absence of water.
(2) \(\mathrm{NaOH}_{(\mathrm{s})} \frac{\text { Water }}{\text { dissociation }}>\mathrm{Na}_{(\mathrm{aq})}^{+}+\mathrm{OH}_{(\mathrm{aq})}^{-}\)
(3) H₂SO₄ is a strong acid.
(4) NaC1 is an ionic compound.
(5) Turmeric is synthetic indicator.
(6) Metal + Dilute acid forms salt and water.
(7) Copper oxide is called red primer.
(8) Oxide of non-metal + Acid → Salt + Water.
(9) Zinc oxide reacts with sodium hydroxide to form sodium zincate.
(10) Al₂O₃ is an amphoteric oxide.
(11) Blue vitriol ZnSO₄. 7H₂O.
(12) Molecular formula for crystalline Ferrous sulphate is Fe5O₄. 5H₂O.
(13) NaCl in water does not conduct electricity.
(14) Phenolphthalein is colourless in base.
Answer:
(1) False. The separation of H⁺ and Cl^– in HC1 is in presence of water.
(2) True
(3) True
(4) True
(5) False. Turmeric is a natural indicator.
(6) False. Metal + Dilute acid forms salt and hydrogen gas.
(7) False. Iron oxide is called red primer.
(8) False. Oxide of izan-metal + Base → Salt + Wafer.
(9) True
(10) True
(11) False. Blue Vitriol is CuSO₄. 5H₂O.
(12) False. Molecular formula for crystalline Ferrous sulphate is FeSO₄. 7H₂O.
(13) False. NaCl in water conducts electricity.
(14) False, Phenolphthalein is colourless in acid and pink in base.

Define the following:

Question 1.
Acid
Answer:
An acid is a substance which on dissolving in water gives rise to H ion as the only cation. For example, HC1, H₂ SO₄, H₂CO₃.

Question 2.
Base
Answer:
A base is a substance which on dissolving in water gives rise to the OW ion as the only anion. For, NaOH, Ca(OH)₂

Question 3.
Strong Acid
Answer:
On dissolving in water, a strong acid dissociates almost completely, and the resulting aqueous solution contains mainly H ions and the concerned acidic radical. e.g. HC1, HBr, HNO₃, H₂SO₄.

Question 4.
Weak Acid
Answer:
On dissolving in water a weak acid does not dissociate completely, and the resulting aqueous solution contains H+ ion and the concerned acidic radical in small proportion along with large proportion of the undissociated molecules of the acid, e.g., H₂CO₃ (Carbonic acid), CH₃COOH (Acetic acid)

Question 5.
Strong Base
Answer:
On dissolving in water, a strong base dissociates almost completely and the resulting aqueous solution contains mainly OH ions and the concerned basic radicals, e.g. NaOH, KOH, Ca(OH)₂, Na₂O.

Question 6.
Weak Base
Answer:
On dissolving in water, a weak base does not dissociate completely and the resulting aqueous solution contains a small proportion of OH ions and the concerned basic radical along with a large proportion of undissociated molecules of the base. e.g. NH₄ OH.

Question 7.
Alkali
Answer:
The bases which are highly soluble in water are called alkali, e.g. NaOH, KOH, NH3. Here, NaOH and KOH are strong alkalis while NH₃ is a weak alkali.

Question 8.
Basicity of acids
Answer:
The number of H⁺ ions obtainable by the dissociation of one molecule of an acid is called its basicity.

Question 9.
Acidity of bases
Answer:
The number of OH ions obtainable by the dissociation of one molecule of a base is called its acidity.

Question 10.
Concentration of solute in the solution.
Answer:
The proportion of a solute in a solution is called the concentration of the solute in the solution.

Question 11.
Concentrated solution.
Answer:
When the concentration of a solute in its solution is high, it is a concentrated solution.

Question 12.
Dilute solution
Answer:
When the concentration of a solute in its solution is low, it is a dilute solution.

Question 13.
Neutralization
Answer:
A reaction in which an acid reacts with a base to form salt and water is called a neutalization reaction.
NaOH + HC1 → NaCl + H₂O
Base + Acid → Salt + Water

Question 14.
Cathode
Answer:
The electrode connected to the negative terminal of a battery by means of a conducting wire is called a cathode.

Question 15.
Anode
Answer:
The electrode connected to the positive terminal of a battery by means of a conducting wire is called an anode.

Question 16.
Cations
Answer:
Cations are positively charged ions which are attracted towards negative electrode (cathode) when electricity is passed into a solution of an ionic compound.

Question 17.
Anions
Answer:
Anions are negatively charged ions which are attracted towards the positive electrode (anode) when electricity is passed into a solution of an ionic compound.

Question 18.
Electrolytic cell
Answer:
An assembly that consists of a container with an electrolyte and the electrodes dipped in it, is called an electrolytic cell.

Question 19.
Molarity of a solution
Answer:
The number of moles of the solute dissolved in one litre of the solution is called the molarity of that solution. The molarity of a solute is indicated by writing its molecular formula inside a square bracket for example [NaCl] = 1

Question 20.
Acid – base indicators
Answer:
Some natural and synthetic dyes show two different colours in acidic and basic solution, and such dyes are acid base indicators.

Explain the following chemical reactions with the help of balanced equations:

Question 1.
Magnesium reacts with dilute hydrochloric acid.
Answer:
When magnesium reacts with dilute hydrochloric acid, it forms magnesium chloride and hydrogen gas is liberated.

Question 2.
When copper reacts with nitric acid.
Answer:
When copper reacts with nitric acid, it forms copper nitrate and hydrogen gas is liberated.

Question 3.
When ferric oxide reacts with diluted hydrochloric acid.
Answer:
When Ferric oxide reacts with diluted hydrochloric acid, it forms ferric chloride and water.

Question 4.
When calcium oxide reacts with dilute hydrochloric acid.
Answer:
When calcium oxide reacts with dilute hydrochloric acid, it forms calcium chloride and water.

Question 5.
When Magnesium oxide reacts with dilute hydrochloric acid.
Answer:
When magnesium oxide reacts with dilute hydrochloric acid, it forms magnesium chloride and water.

Question 6.
When zinc oxide reacts with dilute hydrochloric acid.
Answer:
When zinc oxide reacts with dilute hydrochloric acid, it forms zinc chloride and water.

Question 7.
When aluminium oxide reacts with hydrogen fluoride
Answer:
When aluminium oxide reacts with hydrogen fluoride, it forms Aluminium fluoride arid water.

Question 8.
When carbon dioxide reacts with sodium hydroxide.
Answer:
When carbon dioxide reacts with Sodium hydroxide, it forms Sodium carbonate and water.

Question 9.
When carbon dioxide reacts with potassium hydroxide.
Answer:
When carbon dioxide reacts with potassium hydroxide, it forms potassium carbonate and water.

Question 10.
When sulphur trioxide reacts with sodium hydroxide.
Answer:
When sulphur trioxide reacts with sodium hydroxide, it forms sodium sulphate and water.

Question 11.
When calcium hydroxide reacts with carbon dioxide.
Answer:
When calcium hydroxide reacts with carbon dioxide, it forms calcium carbonate and water.

Question 12.
When sodium carbonate reacts with hydrochloric acid.
Answer:
When sodium carbonate reacts with hydrochloric acid, it forms sodium chloride, carbon dioxide and water.

Question 13.
When sodium carbonate reacts with sulphuric acid.
Answer:
When sodium carbonate reacts with sulphuric acid, it forms sodium sulphate, carbon dioxide and water.

Question 14.
When calcium carbonate reacts with nitric acid.
Answer:
When calcium carbonate reacts with nitric acid, it forms calcium nitrate, carbon dioxide and water.

Question 15.
When potassium carbonate reacts with sulphuric acid.
Answer:
When potassium carbonate reacts with sulphuric acid, it forms potassium sulphate, carbon dioxide and water.

Question 16.
When sodium bicarbonate reacts with hydrochloric acid. OR Dilute HC1 was poured on baking soda
Answer:
When sodium bicarbonate reacts with hydrochloric acid, it forms sodium chloride, carbon dioxide and water.

Question 17.
When potassium bicarbonate reacts with nitric acid.
Answer:
When potassium bicarbonate reacts with nitric acid, it forms potassium nitrate, carbon dioxide and water.

Question 18.
When sodium bicarbonate reacts with acetic acid.
Answer:
When sodium bicarbonate reacts with acetic acid, it forms sodium acetate, carbon dioxide and water.

Question 19.
When copper sulphate is heated.
Answer:
When copper sulphate is heated it loses it’s water of crystallization to form white anhydrous copper sulphate.

Question 20.
When Ferrous sulphate is heated.
Answer:
When ferrous sulphate is heated it loses its water of crystallization to form white anhydrous ferrous sulphate.

Q.2. (B)-3. Complete the following table.

Question 1.
Complete the following table.
Answer:

Complete the following reactions.

Question 1.
Answer:

Question 2.
Metal + Dilute acid → Salt + Hydrogen
Answer:

Question 3.
Metal oxide + Dilute acid → SaIt + Water
Answer:

Question 4.
Oxide of non-metal + base → salt + water
Answer:

Question 5.
Carbonate salt of metal + dilute acid → Another salt of metal + Carbon dioxide + water
Answer:

Question 6.
Bicarbonate salt of metal + dilute acid → Another salt of metal + carbon dioxide + water
Answer:

Give scientific reasons:

Question 1.
Ionic compound NaCl has very high stability.
Answer:

• The outermost shell of both Na⁺ and Cl^– ions is a complete octet.
• An electronic configuration with a complete octet indicates a stable state.
• A molecule of NaCl has Na⁺ and Cl^– ions. An ionic bond is formed between these ions.
• The force of attraction between them is very strong as it is formed between the oppositely charged Na⁺ and Cl^– ions.
• Therefore NaCl, an ionic compound has very high stability.

Question 2.
Ionic compound dissociates while forming an aqueous solution.
Answer:

• On dissolving in water, an ionic compound forms an aqueous solution.
• In the solid state, the oppositely charged ions in the ionic compound are sitting side by side.
• When an ionic compound being to dissolve in water, the water molecules push themselves in between the ions of the compound and it separates them from each other, that is to say, an ionic compound dissociates while forming an aqueous solution.

Question 3.
Blue coloured copper sulphate crystals become colourless on heating.
Answer:

• Copper sulphate crystals are blue in colour and crystalline in form due to presence of water of crystallisation.
• Each molecule of crystalline copper sulphate contains five molecules of water of crystallisation (CuSO₄.5H₂O).
• On heating, the copper sulphate crystals lose the water of crystallisation and turns into white amorphous powder called as anhydrous copper sulphate.
• Therefore, blue coloured copper sulphate crystals become colourless on heating.

Question 4.
During electrolysis of water, a few drops of sulphuric acid are added to it.
Answer:

• Pure water is a covalent compound and hence it is a non-electrolyte and does not conduct electricity.
• When a few drops of sulphuric acid (H₂SO₄) are added to water.
• Being a strong acid it dissociates almost completely in its solution forming H⁺ cations and \(\mathrm{SO}_{4}^{2-}\) anions.
• The movement of these ions in the solution towards the respective electrodes amount to the conduction of electricity through the solution.
• Therefore, during electrolysis of water, a few drops of sulphuric acid are added to it.

Question 5.
Glucose is a non-electrolyte.
Answer:

• Glucose is a covalent compound
• It does not form any ions in its aqueous solution.
• Due to this aqueous solution of glucose does not conduct electronic current.
• Hence, glucose is a non-electrolyte.

Question 6.
Pure water is a poor conductor of electricity but aqueous solution of sodium chloride conducts electricity.
Answer:

• Pure water does not contain any free ions.
• Sodium chloride (NaCl) is an ionic compound made up of sodium cation (Na⁺) and chloride anion (Cl)
• When sodium chloride is dissolved in water , these ions dissociates in its aqueous solution. ‘
• These ions are free to move in the solution and conduct electricity.
• Therefore, pure water is a poor conductor of electricity but aqueous solution of sodium Chloride conducts electricity.

Question 7.
When carbon dioxide gas is passed through freshly prepared lime water, the limewater turns milky.
Answer:

• Limewater traditionally means a weak solution of the alkali calcium hydroxide Ca(OH)₂.
• When CO₂ is passed through limewater, it reacts with calcium hydroxide to form insoluble particulates (precipitate of calcium carbonate (CaCO₃).
• Calcium carbonate is weak basic salt and this gives a milky white precipitate.
  
• Hence, lime water turns milky when CO₂ gas is passed through it.

Q.3.1. Answer the following:

Question 1.
Write down chemical equations for
(a) Zinc oxide reacts with sodium hydroxide
(b) Aluminium oxide reacts with sodium hydroxide.
Answer:
(a) When zinc oxide reacts with sodium hydroxide, it forms sodium zincate and water

(b) When Aluminium oxide reacts with sodium hydroxide, it forms sodium aluminate and water.

Question 2.
Can we call Al₂O₃ and ZnO acidic oxides on the basis of above reactions.
Answer:

• No, because they also react with acids to form their respective salts and water.
• So, they show the properties of basic oxides also.

Question 3.
Define ‘amphoteric oxides’ and give two examples.
Answer:

• Amphoteric oxides are those oxides which react with both adds as well as bases to form their respective salts and water.
• Amphoteric oxides show the properties of both acidic oxides as well as basic oxides. ZnO and Al₂ O₃ are amphoteric oxides.?

Question 4.
Take a solution of 1g copper sulphate in 50ml water in a 100 ml capacity beaker. Use a thick plate of copper as anode and a carbon rod as cathode. Arrange the apparatus as shown in the figure and pass an electric current through the circuit for some time. Do you see any changes?
Answer:

• A thin film of copper metal is deposited on cathode which is immersed in solution. There is no change in colour of solution
• The electrons from cathode combines with Cu²⁺ ion from the solution forming Cu atoms which were then deposited on the cathode.

Q.3.5. Answer in brief:

Question 1.
What are acids, bases and salts?
Answer:

• Compounds having H⁺ as the basic radical in their molecules are called Acids.
• Compounds having OH^– as the acidic radical in their molecule are called Bases.
• Ionic compounds which have a basic radical other than H⁺ and an acidic radical other than OH^– are called salts.

Question 2.
What is an ionic bond?
Answer:

• The molecule of an ionic compound has two constituents namely cation (positive ion / basic radical) and anion (negative ion / acidic radical).
• There is a force of attraction between these ions as they are oppositely charged, and that is called the ionic bond.
• The force of attraction between one positive charge on a cation and one negative charge on an anion makes one ionic bond.

Question 3.
Give examples to show that proportions of H⁺ and OH^– ions in aqueous solution determines the properties of those solutions.
Answer:
The examples to show that proportions of H⁺ and OH^– ions in aqueous solution determines the properties of those solutions are :

• The proportions of H⁺ and OH ions divides soil into the acidic, neutral and basic, types of soil.
• It is necessary for blood, cell sap etc to have H⁺ and OH^– ions in certain definite proportions for their proper functioning.
• Fermentation carried out with the help of micro-organisms, other biochemical processes and also many chemical processes require the proportion of H⁺ and OH^– ions to be maintained within certain limits.

Question 4.
What is pH scale?
Answer:

1. In 1909, the Danish scientist Sorensen introduced a convenient new scale of expressing H⁺ ion concentration which is found to be useful in chemical and biochemical processes.
2. It is the pH scale (pH: power of hydrogen). The pH scale extends from 0 to 14. According to this scale pure water has a pH of 7. pH 7 indicates a neutral solution. This pH is the midpoint of the scale.
3. The pH of an acidic solution is less than 7 and?

Question 5.
Give the pH of following solutions.
Answer:

Question 6.
What is universal indicator? Which is the most accurate method of measuring the pH of a solution?
Answer:

• In the pH scale, the pH of solutions varies from 0 to 14 in accordance with the strength of the acid or base.
• To show these variations in pH, a universal indicator is used.
• A universal indicator shows different colours at different values of pH. A universal indicator is made by mixing several synthetic indicators in specific proportions.
• The pH of a solution can be determined by means of a universal indicator solution or the pH paper made from it.
• However, the most accurate method of measuring the pH of a solution is to use an electrical instrument called pH meter.
• In this method, pH is measured by dipping electrodes into the solution.

Answer in detail:

Question 1.
Explain the Arrhenius theory of acids and bases.
Answer:
The Swedish scientist Arrhenius put forth a theory of acids and bases in the year 1887. This theory gives definitions of acids and bases as follows:
Acid : An acid is a substance which on dissolving in water gives rise to H ion as the only cation. For example, HCl, H₂SO₄, H₂CO₃

Base: Abase is a substance which on dissolving in water gives rise to the OH ion as the only anion, For example, NaOH, Ca(OH)₂

Question 2.
Write a short note on Neutralization.
Answer:

• Take 10 ml of dilute HCl in a beaker, go on adding dilute NaOH drop by drop and record the pH.
• Stop adding the NaOH when the green colour appears on the pH paper, that is when the pH of solution becomes 7.
• Both HCl and NaOH dissociate in their aqueous solutions.
• Addition of NaOH to HCl solution is like adding a large concentration of OH ions to a large concentration of H⁺ ions.
• However water dissociates into H⁺ and OH ions to a very small extent.
• Therefore on mixing the excess OH^– ions combines with excess H⁺ ions and forms H₂O molecules which mix with solvent water.
• This change can be represented by the ionic equation shown as follows. H⁺ + Cl^– + Na⁺ + OH^– → Na⁺ + Cl^– + H₂O
• It can be observed that Na⁺ and CT ions are there on both the sides. Therefore the net ionic reaction is H⁺ + OH^– → H₂O
• As NaOH solution is added drop by drop to the HCl solution, the concentration of ff goes on decreasing due to combination with added OH ions, and that is how the pH goes on increasing.
• When enough NaOH is added to HCl, the resulting aqueous solution contains only Na⁺ and Cl^– ions, that is, NaCl, a salt, and the solvent water. The only source of H⁺ and OH^– ions in this solution is a dissociation of water.
• Therefore, this reaction is called the Neutralization reaction. The Neutralization reaction is also represented by the following simple equation.
  

Question 3.
Explain the water of Crystallization.
Answer:

• Take some crystals of blue vitriol (CuSO₄. 5H₂O) in a test tube. Heat the test tube on a low flame of a burner.
• It was observed that on heating, the crystalline structure of blue vitriol broke down to form a colourless powder and water came out.
• This water was part of the crystal structure of blue vitriol. It is called water of crystallization.
• On adding water to the white powder a solution
  
  was formed which had the same colour as the solution in the first test tube.
• From this we come to know that no chemical change has occurred in the crystals of blue vitriol due to heating.
• Losing water on heating blue vitriol, breaking down of the crystal structure, losing blue colour and regaining blue colour on adding water are all physical changes.
  
• Similarly, ferrous Sulphate crystals also contain 7 molecules of water of crystallization which are lost on heating.
• The reaction is represented as
  
• Ionic compounds are crystalline in nature. These crystals are formed as a result of definite arrangement of ions.
• In the crystals of some compounds, water molecules are also included in this arrangement.
• That is the water of crystallization. The water of crystallization is present in a definite proportion of the chemical formula of the compound.

Question 4.
Explain the conduction of electricity through solutions of ionic compounds
Answer:

1. Electrons conduct electricity through electrical wires, and ions conduct electricity through a liquid or a solution.
2. Electrons leave the battery at the negative terminal, complete the electric circuit and enter the battery at the positive terminal.
3. When there is a liquid or a solution in the circuit, two rods, wires or plates are immersed in it. These are called electrodes.
4. Electrodes are made of conducting solid. The electrode connected to negative terminal of a battery by means of a conducting wire is called a cathode and the electrode connected to the positive terminal of a battery is called anode.
5. We have seen that salts, strong acids and strong bases dissociates almost completely in their aqueous solutions.
6. Therefore the aqueous solutions of all these three contain large number of cations and anions.
7. A characteristic of liquid state is the mobility of its particles. Due to its mobility the positive charged ions of the solution are attracted to the negative electrode or cathode.
8. On the other hand, the negative charged ions of the solution are attracted to the positive electrode or anode.
9. The movement of ions in the solution towards the respective electrodes accounts to the conduction of electricity through the solution.
10. From this we can understand that those liquids or solutions which contain a large number of dissociated ions conduct electricity.
    

Balbharti Maharashtra State Board Class 9 Geography Solutions Chapter 11 Transport and Communication Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 9 Geography Solutions Chapter 11 Transport and Communication

Class 9 Geography Chapter 11 Transport and Communication Textbook Questions and Answers

1. Differentiate between:

(A) Railways and roadways
Answer:

(B) Transportation and communication
Answer:

(C) Conventional and modern means of communication.
Answer:

2. Answer in detail:

Question 1.
‘Newspapers are used for communication’. Explain the statement.
Answer:

• The news related to economic events, politics, social issues, culture, education, etc. are published in newspapers.
• Newspapers arecheap means of communication. Through newspapers information gets spread to masses at a time.
• Newspapers are published in various languages.
• In this way, newspapers are used for communication.

Thus, newspapers are used for communication.

Question 2.
Explain how T.V. is a cheap means of communication.
Answer:

• Various programs, serials, etc. related to entertainment, social issues, culture, education, politics, economic events, sports, weather conditions, etc. are broadcasted on television.
• Through television the information is exchanged to masses at a time with high speed.
• Television can broadcast both audio and video for communication. In this way, television is a cheap means of communication.

Thus, TV is a cheap means of communication.

Question 3.
What types of communications can be done through mobiles?
Answer:

• Calling and SMS (Short message system) facilitates easy one-to-one communication, using mobiles anywhere and at any time.
• Video conferencing and applications like ‘Whatsapp’ allow one to communicate with many people simultaneously.
• Various functions like, money transfer, payment of bills, purchase of goods and services and online trading can be done using smart phones’ various apps like BHIM, SBI anywhere, etc.
• Internet and social media can also be accessed through mobile phones.

3. Name them on the basis of the given information:

Question 1.
Five cities with airways services in Maharashtra
Answer:
Mumbai, Pune, Nagpur, Kolhapur, Aurangabad, Nashik and Nanded.

Question 2.
Services available in post offices
Answer:

• Financial Services: Saving schemes, insurance services and mutual fund.
• Mail services: Speed post, postcard, parcel and courier.

Question 3.
National Highways near your area
Answer:

• Mumbai- Goa Highway (NH 66)
• Mumbai- Bangaluru highway (NH 04)
• Mumbai- Agra Highway (NH 08)
  Note: Answer may vary.

Question 4.
Ports along the coast of Maharashtra
Answer:

• Malvan
• Venture
• Vasai
• Dahanu
• Gharapuri

4. Identify the relation and match the columns making a chain

Answer:

5. Read the following maps and answer the questions:

Question 1.
In which region do you find a dense network of transport routes in the map?
Answer:
The central part of the district has dense network of transport routes.

Question 2.
How is the physiography of the region with dense network?
Answer:
The central part of the district has lower and medium elevation as compared to the Western part.

Question 3.
Which region has a sparse network of transport routes?
Answer:
The transport network is sparse in the Eastern part of the district.

Question 4.
How is the physiography of this region?
Answer:
The region with sparse network of transport . routes is comparatively of lower and medium elevations.

Question 5.
Look for the region lacking transport routes.
Answer:
The Western region lacks transport routes.

Question 6.
What kind of obstruction can you find there?
Answer:
Sahyadri Mountains and Shivsagar reservoir of Koyna dam are the obstructions found here.

Class 9 Geography Chapter 11 Transport and Communication Intext Questions and Answers

Let’s Recall

Complete the following table:

Answer:

Can you tell?

We have given some specific conditions. In this context, tell with reasons which means of transport route will you take?

Question 1.
You have to reach Bhopal from Nagpur due to some emergency.
Answer:
Airways : As it is the fastest mode of transport.

Question 2.
You have to reach Kanyakumari carrying the message of cleanliness. There is no time limit for it.
Answer:
Roadways : Since roadways connect even the remotest places the message can reach to all persons.

Question 3.
Send the Alphonso mangoes from Konkan to Arab countries.
Answer:
Airways – Since mango is a perishable commodity, the fastest mode of transportation is used. ,

Question 4.
Indrayani variety of rice has to be exported from Pune to Cape Town of South Africa at low expenditure.
Answer:
In such conditions, we will choose waterways as a route and ship as a means of transport. Because rice is comparatively durable agricultural good in the given situation it has to be transported at low cost.

Question 5.
Large-scale production of vegetables in Nandurbar has taken place but is not fetching a good price. The Nagpur-Surat National Highway and the Surat-Bhusawal Railway line passes through the district.
Answer:
In a given situation, we will choose roadways and railways as a route and truck and goods’ ways/train respectively as a means of transport. Because the highway and railway line that pass through the district, connects the important towns and cities from the district.

Question 6.
You have to go to Singapore from your village/ town. You have 10 days to do the same.
Answer:
Roadway and Airways: I will first reach the nearest airport of a city by road and then take an Airway. It is the fastest mode of transport.

Can you tell?

Question 1.
Make a list of various means of communication you are aware of.
Answer:
Letters, radio, television, telephones, mobile phones, newspaper, internet, satellites etc. are the various means of communication.

Question 2.
How many of these do you actually use? Make a box around them.
Answer:

Question 3.
For what do you use them ?
Answer:
We use these means of communication to exchange important information, ideas, opinions etc. with friends, parents, relatives and teachers.

Question 4.
Who uses the remaining means ?
Answer:
The remaining means are used by parents, other relatives, businessmen from locality and government agencies.

Can you do it?

Observe the image and the instructions given on page 87 of the textbook and answer the following questions:

Question 1.
Which are the dates mentioned in the image?
Answer:
The dates mentioned are 15/5/2017 and 19/5/2017

Question 2.
What does the information in the image tell?
Answer:
The image informs that the person’s email account has been hacked. He cannot access his important files as they have been encrypted and to recover his files, he will have to pay a certain amount to the hacker.

Question 3.
What is the price asked for recovering the files and in what currency?
Answer:
The price asked for recovering the files is 300 US dollars in bitcoins.

Question 4.
What is the type of crime here?
Answer:
This is a cyber crime.

Give it a try
Think about the transport issues you come across during your journeys. Write the innovative changes you would suggest in the transport routes or means in your copy.

Question 1.
Congested city roads and Pollution
Answer:
Electric cars which are smaller and smarter.

Question 2.
Time-consuming travel
Answer:
Dedicated bus corridors, carpooling, more number of Expressways.

Give it a try

Question 1.
Look for the other uses of artificial satellites? Try to understand how they are related to your daily life?
Answer:
(a) The other uses of artificial satellites are as follows:

• Studying about other planets.
• Live broadcasting of a program/event from any region of the earth.
• Studying the resources on the earth’s surface.
• Regional planning.
• Planning defense strategies.
• Forecasting weather etc.

(b) The artificial satellites are directly or indirectly related to personal, social, educational, economic, cultural, political aspects in everyone’s daily life. For eg. through artificial satellites, one can enjoy a live program like award functions/cricket match, etc. on television.

Class 9 Geography Chapter 11 Transport and Communication Additional Important Questions and Answers

Complete the statement choosing the correct option from the bracket:

Question 1.
The price of the goods can be kept low if the transportation is ………….. .
(a) feasible
(b) expensive
(c) costly
(d) affordable
Answer:
(d) affordable

Question 2.
…………… growth gets a boost due to transportation.
(a) Physical
(b) Culture
(c) Economic
(d) Political
Answer:
(c) Economic

Question 3.
Freight transport through …………… is costlier than railways.
(a) trucks
(b) horses
(c) bullock-cart
(d) yak
Answer:
(a) trucks

Question 4.
The western part of Satara district is occupied by the …………… of its off shoots.
(a) Vindhyas
(b) Satpudas
(c) Sahyadris
(d) Aravallis
Answer:
(c) Sahyadris

Question 5.
The use of RORO (Roll on Roll off) services started in …………… railways in India.
(a) Goa
(b) Maharashtra
(c) Konkan
(d) Pune
Answer:
(c) Konkan

Question 6.
In the modem age, man-made …………… are an important and effective means of communication.
(a) planets
(b) asteroids
(c) satellites
(d) rockets
Answer:
(c) satellites

Question 7.
Satellite images obtained by …………… facilitate study of resources on Earth’s surface and help in regional planning.
(a) GPS
(b) radio
(c) remote sensing1
(d) drones
Answer:
(c) remote sensing

Question 8.
Communication is not just limited to talking on telephones or sending messages but …………… is also available now.
(a) tele-calling
(b) STD-Calling
(c) video-calling
(d) Local-calling
Answer:
(c) Video-calling

Question 9.
There is a correlation between transport routes and the …………… of region.
(a) soil type
(b) rainfall
(c) climate
(d) physiography2
Answer:
(d) physiography

Question 10.
Transport facilities can develop well in …………… region.
(a) mountainous
(b) plain
(c) forest
(d) plateau
Answer:
(b) plain

Question 11.
Shiv sagar reservoir of the …………… dam is located in the Satara district.
(a) Ram Krishna
(b) Bhakra-Nagal
(c) Koyna
(d) Tehri
Answer:
(c) Koyna

Question 12.
The …………… part of Satara district has a dense transport network.
(a) Western
(b) Central
(c) Eastern
(d) Southern
Answer:
(b) central.

Write answers in one sentence

Question 1.
What is transportation?
Answer:
The movement of goods and people from one place to another is called transportation.

Question 2.
Which are the different kinds of transport routes?
Answer:
Roadways, railways, waterways, airways and pipelines are the different kinds of transport routes.*

Question 3.
For what reasons does a region become devoid of any transport route?
Answer:
Due to mountains, valleys, rivers, reservoirs

1. remote sensing – obtaining information regarding any place or an object without actually establishing direct contact with it is called remote sensing.
2. physiography – nature and slope of land and undulating1 topography2 a region becomes devoid of any transport route.

Question 4.
Why does a dense network of transportation develop in some regions?
Answer:
A dense network of transportation develops in some regions due to lower and medium elevation, plains, flat and regular topography, etc.

Question 5.
What does Ro-Ro transport stand for?
Answer:
Ro-Ro transport is Roll-on, Roll-off transport.

Question 6.
Why was the Ro-Ro transport introduced?
Answer:
Freight transport by trucks is costlier than railways, so as a solution the Ro-Ro transport has been introduced.

Question 7.
What are Cyber Crimes?
Answer:
Crimes like website/email hacking, theft of information, economic frauds, wars, terrorism, etc. that are committed by using computers and internet are called ‘cyber crimes’.

Question 8.
How are BHIM app, SBI anywhere app useful?
Answer:
BHIM App, SBI Anywhere app, helps us to pay various bills, sell, buy and carry out various transactions through mobile phones.

Question 9.
Where was Ro-Ro service introduced for the first time in India?
Answer:
Ro-Ro service, was introduced for the first time in India by the Konkan Railway.

Give Reasons:

Question 1.
The development of transportation is an indicator of the development of that region.
Answer:

• With development of transportation there is an increase in the movement of freight and passengers of that region.
• Development of transportation develops industries and markets.
• Per capita Income (PCI) and Gross Domestic product (GDP) increases leading to economic growth.
• So it is said that development of transportation is an indicator of the development of that region.

Question 2.
Green Corridor saves many lives.
Answer:

1. Green Corridor is a route cleared of all traffic obstacles, so that a dead person’s (donor’s) organs can be speedily transported to the receiver
2. It is called ‘green’ corridor because the traffic lights are turned green for the speedy movement of the vehicle carrying the organ.
3. Thus, Green Corridor saves many lives.

Question 3.
Ro-Ro Transport helps to reduce cost of transport.
Answer:

• In Ro-Ro (Roll-on, Roll-off) transport, the trucks loaded with goods are transported to desired railway stations through a goods train.
• From there the trucks take the goods ahead to the desired locations.
• Ro-Ro transport helps to reduce the cost of transport as railways are used for the part of the distance.
• Ro-Ro transport also reduces cost of fuel and pollution caused by trucks.

Answer in details:

Question 1.
Give the Importance of transportation.
Answer:
Transportation is a basic infrastructure.
The development of transportation infrastructure is an indicator of the development of the particular region or a country.

The importance of transportation can be explained with the help of the following points :

• Extending trade and network.
• Rapid industrialisation.
• Availability of employment opportunities.
• Regional connectivity.
• Utility of the site.
• Overcoming scarcity (deficit).
• Decreasing regional imbalance1.
• Tourism development.

Question 2.
Give the Importance of a communication system.
Answer:

• Communication or exchange of information is an important process in today’s era. Communication is basic infrastructure.
• Man-made satellites are an important and effective means of communication.
• The exchange of messages through mobiles, watching progammes on television, getting updates of climatic condition etc. is possible simultaneously through man-made satellites.
• Satellite images obtained by remote sensing facilitate study of resources on earth’s surface and helps in regional planning.
• Many apps which can be used on mobile phones have been developed for the same.
• For e.g. BHIM app, SBI anywhere, etc. By using these communicational facilities, we can pay various bills, sell and buy goods and services and carry other such transactions.
• Nowadays, communication is not just limited to talking on telephone or sending messages but also video calling is available now.

Explain:

Question 1.
Factors to be kept in mind while selecting the route way and the means of transport.
Answer:
The following factors should be kept in mind while selecting the route way and means of transport:

• Distance
• Duration
• Cost
• Time
• Products
• Climate
• Market
• Routes and means
• Physiography

Question 2.
Importance of Transportation.
Answer:

1. The development of transportation infrastructure is an indicator of the development of the country or that region.
2. The reforms in the transport sector enhance the dynamicity of freight and passengers in a region.
3. Industries and markets develop. Economic growth gets a boost. Per Capita Income (PCI) and Gross Domestic Product (GDP) increases too.
4. Transportation leads to –
   • Extending trade and network
   • Rapid industrialisation
   • Availability of employment opportunities
   • Regional connectivity
   • Utility of the site
   • Overcoming scarcity (weakness)
   • The decrease in regional imbalance
   • Tourism development

Question 3.
Importance of man-made satellites.
Answer:

• In the modern age, man-made satellites are an important and effective means of communication.
• The exchange of messages through mobiles, watching programmes on TV and getting updated information regarding climatic conditions is possible simultaneously through man-made satellites.
• Satellite images obtained by remote sensing facilitate study of resources on earth’s surface and help in regional planning.

Thus, man-made satellites are important.

Question 4.
Green Corridor.
Answer:

• It happens that sometimes a dead person has donated his organs.
• In such cases, such organs need to be transported from the donor’s location to the receiver urgently.
• For this organ transfer, all types of routes are cleared of all obstacles. This is called Green Corridor.
• Consequently, this kind of rapid transport corridor can save the receiver’s life.

Question 5.
Threats associated with means of communication.
Answer:

• Besides facilities, means of communication have a few threats associated with them.
• Many crimes are happening through the internet like website/email hacking, fraud, theft, attack, wars and terrorism. Possibilities of threats like theft of information, economic frauds, attacking important websites etc. arise.
• Therefore, one should take precautions while using social networks.
• One should not reveal personal information before ensuring safety.
• One should not put any sensitive information or personal information on social networking sites, blogs, etc.

Balbharti Maharashtra State Board Class 9 History Solutions Chapter 9 Changing Life 1 Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 9 History Solutions Chapter 9 Changing Life 1

Class 9 History Chapter 9 Changing Life 1 Textbook Questions and Answers

1. Choose the proper option and rewrite the completed statements:

Question 1.
The first open-heart surgery under the leadership of Dr N Gopinath was successfully performed in the city of _____.
(a) Chennai
(b) Vellore
(c) Hyderabad
(d) Mumbai
Answer:
(b) Vellore

Question 2.
_______is known as the father of the ‘Jaipur foot’.
(a) Dr N. Gopinathan
(b) Dr Pramod Sethi
(c) Dr Mohan Rao
(d) None of the above
Answer:
(b) Dr Pramod Sethi

2. Identify the wrong pair and rewrite the corrected one:

Question 1.
(1) Dr N. Gopinath – open heart surgery
(2) Ramchandra Sharma – a skilled craftsman
(3) Dr Subhash Mukhopadhyaya – test tube baby
(4) Dr Mohan Rao – polio
Answer:
Wrong Pair: Dr Mohan Rao – polio

3. Explain the concepts:

Question 1.
The institution of the family.
Answer:
The institution of family can be explained as follows:

• During the pre-independence period, the institution of the family was an important identifying feature of Indian society.
• India was known all over the world as the country of joint families.
• However, the wave of globalisation has now given an impetus to the system of nuclear families.

Question 2.
Jaipur Foot technology
Answer:
(i) Dr Pramod Sethi designed and manufactured artificial limbs, noses and ears, with the help of the skilled craftsman Ramchandra Sharma.

(ii) These artificial body parts manufactured with the help of the Jaipur foot technology have made it easy for the differently-abled to walk bare-foot on rough surfaces, run, go cycling, work in the fields, climb trees, and even climb mountains, etc.

Question 3.
Urbanization
Answer:
(i) Urbanisation is a process of the concentration of population in a city or urban area. Increasing population is one major reason for urbanisation.

(ii) A few other factors affecting urbanisation are air, water and the economic as well as social organisations necessary for community life.

(iii) In the context of post-independence India, the increase in urban population is also due to factors such as a reduction in the mortality rate, industrialisation, unavailability of means of livelihood in rural areas, job opportunities in cities and the resulting migration.

Question 4.
Changing economic life
Answer:
(i) Earlier, every village was economically self-sufficient. A majority of the villagers were dependent on farming. Farm produce used to be distributed among artisans as payment for their work.
(ii) Now this situation has changed. Rural areas are engaged in agriculture and occupations ancillary to farming while urban society is engaged in non-agricultural production and the service sector.

4. Give reasons:

Question 1.
The campaign for pulse polio immunisation was initiated.
Answer:
The campaign of pulse polio immunisation was initiated because:

• Before 1978, every year, six Indian infants out of every 10 who were bom faced fatal health problems in the very first year of their birth.
• The immunisation programme was taken up to overcome the threat of polio, measles, tetanus, TB, diphtheria, and whooping cough.
• The ‘pulse polio’ immunisation programme started in 1995 has controlled polio.

Question 2.
The Rural Water Supply Scheme was started.
Answer:
The State started the Rural Water Supply Scheme for sinking wells and providing piped water because:

(i) It is necessary to give priority to facilities for public hygiene and health-care. However even today, the rural population faces problems related to year-round provision of drinking water, toilets, open drainage, narrow roads, inadequate electrification and lack of facilities for medical treatment.

(ii) There is a lack of good quality educational facilities from primary level to higher education, centres for recreation and libraries.

(iii) The collective development scheme had an important place in all the first four five year plans of the government of India. The State of Maharashtra registered remarkable achievements under this scheme. By 1971,1677 small dams had also been built.

5. Answer the following questions in 25-30 words:

Question 1.
Which kinds of discrimination does the Constitution prohibit?
Answer:
(i) According to our Constitution, all Indians are equal before the law, and they cannot be discriminated against on the basis of religion, race, caste, gender or place of birth.

(ii) All citizens have the right to freedom of speech and expression, freedom to assemble peacefully without arms, freedom to form associations, freedom to move, to live and settle down anywhere on Indian territory and to practice any occupation.

(iii) Indian citizens living anywhere in India enjoy the right to nurture their language, script and culture.

Question 2.
What is the aim of the social welfare programme?
Answer:
(i) The objective to establish the welfare state has been incorporated in the Constitution itself.

(ii) The social welfare programmes aim to make opportunities for full-time employment, health care, education and development available to all Indian citizens. Indian society is riddled with large scale economic, social, educational and cultural inequalities.

(iii) However, it is necessary that opportunities for development reach women, children, the differently-abled, the scheduled castes and tribes as well as other minorities.

(iv) Hence on 14th June 1964, the government of India constituted the Ministry of Social Welfare. Under this ministry, various programmes are implemented for nutrition and child- development, social security and social protection, women’s welfare and development.

Question 3.
What are the challenges facing rural development?
Answer:

(i) In 1961, 82% of India’s population resided in villages. In 1971, the percentage was 80.01%.
(ii) So far, the rural area has shouldered the responsibility of providing food grains and other raw material to urban areas, supplying labour to the industrial sectors of the city, and taking care of natural resources.
(iii) However there are three major challenges with reference to rural development, namely, bringing about economic development, developing facilities to meet social needs and finally bringing about a change of attitude in matters concerning society, culture and ways of thinking.
(iv) It is also equally necessary to expedite irrigation projects and bring about land reforms.

6. Write a brief review of the significant events in the field of public health in India.
Answer:
The Constitution of India states that the primary duty of the government is to raise the people’s standard of living, to ensure proper nutrition and to improve public health. The Ministry of Health and Social Welfare at the Centre helps the state governments in this regard.

(i) To make primary health services as well as medical care available to rural people, the tribals and the poor was an objective of the Sixth Five Year plan. Efforts were made towards helping people maintain good health by giving recognition to Unani, Homoeopathy, Ayurveda and Naturopathy in addition to Allopathy.

(ii) In 1962, the first successful open heart surgery was performed under the leadership of Dr N. Gopinath at Christian Medical College Hospital at Vellore in Tamil Nadu. Hence, it is no longer necessary to go abroad for such treatment.

(iii) The invention of the ‘Jaipur Foot’ has transformed the lives of the disabled in India.

(iv) Before 1968, if a person lost a leg in an accident, he had to suffer for the rest of his life. In order to remedy the situation, Dr Pramod Sethi designed and manufactured artificial limbs, noses and ears, with the help of the skilled craftsman Ramchandra Sharma.

(v) These artificial body parts manufactured with the help of the Jaipur foot technology have made it easy for the differently-abled to walk bare-foot on rough surfaces, run, go cycling, work in the fields, climb trees, and even climb mountains, etc.

(vi) They save on the expenses on shoes as there is no need for footwear on these artificial limbs. They can bend their legs at the knees and sit cross-legged.

(vii) These feet are also convenient while working in water or under wet conditions.

Class 9 History Chapter 9 Changing Life 1 Additional Important Questions and Answers

Choose the correct option from the given options and rewrite the statements:

Question 1.
On 14th June 1964, the government of India constituted the Ministry of ________.
(a) Home Affairs
(b) Social Justice
(c) Social Welfare
(d) Education
Answer:
(c) Social Welfare

Question 2.
According to the 1971 Census, _____ people in India belonged to scheduled castes.
(a) 21%
(b) 22%
(c) 23%
(d) 24%
Answer:
(b) 22%

Question 3.
UNESCO awarded its international prize for the spread of literacy to ______ in 1972 and tribes.
(a) Gujarat
(b) Bengal
(c) Maharashtra
(d) Karnataka
Answer:
(c) Maharashtra

Question 4.
‘Sinhagad Express’ on the Pune-Mumbai route and ‘ _____’ on the Mumbai-Kolkata route were started which had no class divisions.
(a) Karmabhoomi Express
(b) Howrah Mail
(c) Shalimar Express
(d) Gitanjali Express
Answer:
(d) Gitanjali Express

Question 5.
A _______ was formed to help the development of industry in rural areas.
(a) Village Industries Planning Committee
(b) Co-operative Credit Societies
(c) Industrial Development Association
(d) Rural Industrial Council
Answer:
(a) Village Industries Planning Committee

Question 6.
A settlement smaller than a village is called a _____.
(a) Town
(b) Taluka
(c) Hamlet
(d) Locality
Answer:
(c) Hamlet

Identify and write the wrong pair in the following sets:

Question 1.
(1) Kothari Commission – Agricultural Universities
(2) Durga – Open heart surgery
(3) Pramod Sethi – Artifical limbs
(4) Dr Mohan Rao – Kidney transplant
Answer:
Wrong Pair : Durga – Open heart surgery

Question 2.
(1) Christian Medical College – Tamil Nadu
(2) Vidya Niketan – Chikhaldara
(3) Gitanjali Express – Pune-Mumbai route
(4) First successful artificial conception – Kolkata
Answer:
Wrong Pair : Gitanjali Express – Pune-Mumbai route

Question 3.
(1) Ministry of Social welfare established in -1962
(2) Pulse polio immunisation started – 1995
(3) Maharashtra received a prize for literacy in Maharashtra -1972
(4) Rural Electrification Corporation – 1969
Answer:
Wrong Pair : Ministry of Social welfare established in -1962

Question 4.
(1) Village Industries Planning Committee – Development of Industries in rural areas
(2) Vidya Niketan – residential highschools
(3) Rural water supply schemes – sinking wells
(4) Objective of Sixth Five Year Plan – Advanced technology
Answer:
Wrong Pair : Objective of Sixth five year plan – Advanced technology

Do as Directed:

Complete the table

Question 1.
Answer:

Question 2.
Answer:

Complete the web diagram

Question 1.
Answer:

Question 2.
Answer:

Write short notes:

Question 1.
Rural Development
Answer:
(i) In 1961, 82% of India’s population resided in villages.

(ii) In 1971, the percentage was 80.01%. So far, the rural area has shouldered the responsibility of providing food grains and other raw material to urban areas, supplying labour to the industrial sectors of the city, and taking care of natural resources.

(iii) There are three major challenges with reference to rural development, namely, bringing about economic development, developing facilities to meet social needs and finally bringing about a change of attitude in matters concerning society, culture and ways of thinking.

(iv) It is equally necessary to expedite irrigation projects and bring about land reforms.

Question 2.
Social Welfare
Answer:
(i) The objective to establish the welfare state has been incorporated in the Constitution itself. India is the first country in the world to do so.

(ii) The social welfare programmes aim to make opportunities for full-time employment, health care, education and development available to all Indian citizens.

(iii) It is necessary that opportunities for development reach women, children, the differently abled, the scheduled castes and tribes as well as other minorities.

(iv) This was the greatest challenge facing the government during the post-independence period

(v) That is why, on 14 June 1964, the government of India constituted the Ministry of Social Welfare.

(vi) Under this ministry various programmes are implemented for nutrition and child development, social security and social protection, women’s welfare and development.

Question 3.
Kidney transplant
Answer:
(i) Since kidney transplant can now be performed in India, doctors have succeeded in saving patients’ lives. Such surgeries were not so common in India till 1971.

(ii) But in 1971, it was successfully performed at the Christian Medical College hospital at Vellore in Tamil Nadu.

(iii) Dr. Johny and Dr. Mohan Rao transplanted the kidney donated by a living person into the patient’s body.

(iv) Nowadays, patients from underdeveloped countries come to India for such surgeries.

Question 4.
Test-tube baby
Answer:
(i) Right from early times, having a baby is considered to be of utmost importance in the Indian family system.
(ii) The support of ‘test-tube baby’ technology has been available to childless couples since 1978.
(iii) It was under the supervision of Dr. Subhash Mukhopadhyaya that the experiment of the test-tube baby was successfully carried out at Kolkata.
(iv) This was the first successful attempt at artificial conception. A girl named Durga was born.
(v) This technology helped to solve the problem of childless couples who wanted children.

Explain statements with reason:

Question 1.
Rural electrification is essential.
Answer:
Rural electrification is essential because:

(i) Electricity is essential for the development of rural areas. Automatic pumps are needed to water the fields.

(ii) Electricity is also needed to preserve perishable food items such as milk, eggs, fruits, and vegetables, to run fertilizer projects and for fans and TV, and for lights for studying at night.

(iii) During the first five-year plan, electricity had been provided to three thousand villages in India. By 1973, it reached 1,38,646 villages. From 1966, it was decided to supply more electricity for pumps and borewells.

(iv) ‘Rural Electrification Corporation’ was established in 1969.

Question 2.
It is necessary to give special attention to rural areas.
Answer:
(i) It is necessary to give priority to facilities for public hygiene and health-care.

(ii) Even today the rural population faces problems related to year round provision of drinking water, toilets, open drainage, narrow roads, inadequate electrification and lack of facilities for medical treatment.

(iii) There is a lack of good quality educational facilities from primary level to higher education, centres for recreation and libraries. That is why it is necessary to give special attention to rural areas.

Question 3.
The Rural Local Self-Government was empowered with more authority.
Answer:
(i) Keeping in mind the goal of rural development, the collective development scheme has come into force.

(ii) Plans were made for improving farming technology, increasing the area of irrigated land, extending educational facilities, enacting the laws for land reform under this scheme.

(iii) It also aimed at increasing agricultural produce as well as expanding the means of transport, health services and scope for education in the rural areas.

(iv) The government undertook this work through the medium of Gram Panchayats which included the people from all castes and tribes.

(v) To achieve this, the Gram Panchayats, Panchayat Samitis and Zilla Parishads were empowered with more authority.

Read the following passage and answer the questions below:

Public health: The Constitution of India states that ‘ the primary duty of the government is to raise the people’s standard of living, to ensure proper nutrition i and to improve public health. The ministry of health i and Social Welfare at the Centre helps the state governments in this regard. To make primary health services as well as medical care available to rural people, the tribals and the poor was an objective of the Sixth Five Year plan. Efforts were made towards helping people maintain good health by giving recognition to Unani, Homoeopathy, Ayurveda and Naturopathy in addition to Allopathy, Progress in the medical field has made the life of Indians relatively free of health concerns. In 1962, the first successful open heart surgery was performed under the leadership of Dr. N. Gopinath at Christian Medical College Hospital at Vellore in Tamil Nadu, Hence, it is no longer necessary to go abroad for such treatment.

Question 1.
Prepare a concept map of recognised health care and medical treatments in India.
Answer:

Question 2.
Who was Dr. N. Gopinath? State his achievement?
Answer:
Dr. N. Gopinath was an experienced surgeon at Christian Medical College Hospital of Vellore under whose leadership an Open Heart Surgery was performed for the first time in India in 1962.

Question 3.
Which disease among children do you consider most threatful? Why?
Answer:
I would consider Polio as one of the most threatening diseases. It renders an infant physically impaired or incapacitated for life. Without physical development, it is not possible for a child to lead a normal life. He/she becomes dependent on others for daily chores and cannot become self-reliant.

Answer the following questions in detail:

Question 1.
State the achievements of Christian Medical College Hospital.
Answer:
(i) In 1962, the first successful open heart surgery was performed under the leadership of Dr. N. Gopinath at Christian Medical College Hospital at Vellore in Tamil Nadu.

(ii) In 1971, kidney transplant was successfully performed at the Christian Medical College hospital at Vellore in Tamil Nadu. Dr Johny and Dr Mohan Rao transplanted the kidney donated by a living person into the patient’s body.

Question 2.
Explain, how ‘Jaipur Foot’ has transformed the lives of the disabled in India?
Answer:
(i) The invention of the ‘Jaipur Foot’ has transformed the lives of the disabled in India. Before 1968, if a person lost a leg in an accident, he had to suffer for the rest of his life.

(ii) In order to remedy the situation, Dr Pramod Sethi designed and manufactured artificial limbs, noses and ears, with the help of the skilled craftsman Ramchandra Sharma.

(iii) These artificial body parts manufactured with the help of the Jaipur foot technology have made it easy for the differently abled to walk bare-foot on rough surfaces, rim, go cycling, work in the fields, climb trees, and even climb mountains, etc.

(iv) They save on the expenses on shoes as there is no need for footwear on these artificial limbs. They can bend their legs at the knees and sit cross-legged.

(v) These feet are also convenient while working in water or wet conditions.

Question 3.
What measures were taken up to uplift the scheduled castes and tribes?
Answer:
(i) According to the 1971 Census, 22% people in India belonged to scheduled castes and tribes.

(ii) Laws were enacted so that they got educational scholarships, and representation in Parliament as well State Assemblies. Some seats are also reserved for them in Government services.

Question 4.
Give an account of the collective development scheme that was featured in the first four Five Year Plans.
Answer:
(i) The collective development scheme had an important place in all the first four five year plans of the government of India.

(ii) The State of Maharashtra registered remarkable achievements under this scheme. For example, ‘Zilla Parishads’ was established in 1962.

(iii) Nutritious diet scheme was launched in 1970-1971. The State also started the ‘Rural Water Supply Scheme’ for sinking wells and providing piped water.

(iv) By 1971,1677 small dams had also been built.

Balbharti Maharashtra State Board Class 9 Science Solutions Chapter 3 Current Electricity Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 9 Science Solutions Chapter 3 Current Electricity

Class 9 Science Chapter 3 Current Electricity Textbook Questions and Answers

1. The accompanying figure shows some electrical appliances connected in a circuit in a house. Answer the following questions.

A. By which method are the appliances connected?
Answer:
Appliances are connected in parallel.

B. What must be the potential difference across individual appliances?
Answer:
The potential difference across all appliances is same in parallel connection.

C. Will the current passing through each appliance be the same? Justify your answer.
Answer:
No, as every appliance has a different load (resistance), the current flowing through each appliance will be different.

D. Why are the domestic appliances connected in this way?
Answer:
The domestic appliances are connected in parallel as the potential difference remains same.

E. If the T.V. stops working, will the other appliances also stop working? Explain your answer.
Answer:
No, the other devices will not stop working as the current flowing through them is along different paths.

2. The following figure shows the symbols for components used in the accompanying electrical circuit.

Which law can you prove with the help of the above circuit?
Answer:

(b) This circuit can be used to prove Ohm’s law.
(c) V = 1R is the expression of Ohm’s law

3. Umesh has two bulbs having resistances of 15 W and 30 W. He wants to connect them in a circuit, but if he connects them one at a time the filament gets burnt. Answer the following.

A. Which method should he use to connect the bulbs?
B. What are the characteristics of this way of connecting the bulbs depending on the answer of A above?
C. What will be the effective resistance in the above circuit?

4. The following table shows current in Amperes and potential difference in Volts.

a. Find the average resistance.
b. What will be the nature of the graph between the current and potential difference? (Do not draw a graph.)
c. Which law will the graph prove? Explain the law.

5. Match the pairs

‘A’ Group – ‘B’ Group
1. Free electrons – a. V/ R
2. Current – b. Increases the resistance in the circuit
3. Resistivity – c. Weakly attached
4. Resistances in series – d. VA/LI

6. The resistance of a conductor of length x is r. If its area of crosssection is a, what is its resistivity? What is its unit?

7. Resistances R₁, R₂, R₃ and R₄ are connected as shown in the figure. S₁ and S₂ are two keys. Discuss the current flowing in the circuit in the following cases.

a. Both S₁ and S₂ are closed.
b. Both S₁ and S₂ are open.
c. S₁ is closed but S₂ is open.
Answer:
(a) When both S₁ and S₂ are dosed, the effective resistance of the circuit decreases and hence, current will increase.
(b) When both S₁ and S₂ are open, the effective resistance of the rircuit increases and hence, current will decrease.
(c) When S₂ is closed and S₂ is open, the effective resistance of the tircuit decreases and hence current will increase. [Current will be more than case (b) but less than in case (a)]

8. Three resistances x₁, x₂ and x₃ are connected in a circuit in different ways. x is the effective resistance. The properties observed for these different ways of connecting x₁, x₂ and x₃ are given below. Write the way in which they are connected in each case. (I-current, V-potential difference, x-effective resistance)

a. Current I flows through x₁, x₂ and x₃
b. x is larger than x₁, x₂ and x₃
c. x is smaller than x₁, x₂ and x₃
d. The potential difference across x₁, x₂and x₃ is the same
e. x = x₁ + x₂ + x₃
\(\text { f. } x=\frac{1}{\frac{1}{x_{1}}+\frac{1}{x_{2}}+\frac{1}{x_{3}}}\)

9. Solve the following problems.

A. The resistance of a 1m long nichrome wire is 6Ω. If we reduce the length of the wire to 70 cm. what will its resistance be? (Answer : 4.2Ω)
Answer:
The resistance of 70cm wire will be 4.2 Ω

B. When two resistors are connected in series, their effective resistance is 80Ω. When they are connected in parallel, their effective resistance is 20Ω. What are the values of the two resistances? (Answer : 40Ω, 40Ω)
Answer:
The values of the two resistances R₁ and R₂ are 40Ω and 40Ω.

C. If a charge of 420 C flows through a conducting wire in 5 minutes what is the value of the current? (Answer : 1.4 A)
Answer:
Given: Electric charge (Q) = 420 C
Time (t) = 5 min = 5 x 60
= 300 sec.
To find: Electric current (1) = ?
Formula:
\(I=\frac{Q}{t}\)
Solution:
\(I=\frac{Q}{t}\)
The current in the circuit is 1.4 A.

Class 9 Science Chapter 3 Current Electricity Intext Questions and Answers

Can you recall?

Question 1.
You must have seen a waterfall. Which way does the water flow?
Answer:
Water flows from a certain height of a mountain towards the ground.

Question 2.
Material: Copper and aluminium wires, glass rod, rubber.
Make connection as shown in figure 3.8. First connect a copper wire between points A and B and measure the current in the circuit. Then in place of the copper wire, connect the aluminium wire, glass rod, rubber, etc one at a time and measure the current each time. Compare the values of the current in different cases.

Also take different metal strips (Iron, Copper, Zinc, and Aluminium) and connect it in slot AB. Now observe the difference in the resistance using Ohm meter.
Answer:
When copper and aluminium wires are connected to the circuit, current flows through it, as both are good conductors of electricity. When glass rod or rubber was connected to the circuit, current does not flow through it, as both are bad conductors of electricity.

Copper displays lowest resistance while the resistance increases with aluminium, zinc and iron respectively.

Question 3.
Set up the experiment as shown in figure. Then remove the clamp from the rubber tube.

(a) What happens when the clamp is removed?
Answer:
When the clamp is removed, water flows from higher level to lower level.

(b) Does the water stop flowing? Why?
Answer:
Yes, the water stops flowing. This happens when the level of water becomes equal in both the bottles, i.e., there is no difference in the water levels.

(c) What will you do to keep the water flowing for a longer duration?
Answer:
The difference in the water level has to be maintained till that time. The difference must never be zero.

Question 4.
Point out the mistakes in the figure below:

Answer:
A: Wire is broken at the negative terminal. Bulb will not glow as the circuit is incomplete.
B: Wire is disconnected at the negative terminal. Bulb will not glow as the circuit is incomplete.
C: The circuit is complete. Therefore, bulb will glow.
D: Rubber is a bad conductor of electricity. Hence, it will not allow current to flow and the bulb will not glow.

Question 5.
Why are the bulbs in Figures B, C and D not lighting up?

Answer:

• In B, the blue wire is broken. Hence circuit is incomplete and current does not flow. Therefore, bulb will not light up.
• In C, the red wire is broken. Hence circuit is incomplete and current does not flow. Therefore, bulb will not light up.
• In D, both wires are connected to the same terminal. Hence, there is no potential difference and current does not flow. Therefore, bulb will not light up.

Class 9 Science Chapter 3 Current Electricity Additional Important Questions and Answers

Choose and write the correct option:

Question 1.
1mA = …………… A.
(a) 10³
(b) 10^-3
(c) 10⁶
(d) 10^-6
Answer:
(a) 10³

Question 2.
To increase the effective resistance in a circuit the resistors are connected in ………….. .
(a) Series
(b) Parallel
(c) Both ways
(d) None of these
Answer:
(a) series

Question 3.
1 kilowatt hr = …………… joules.
(a) 4.6 x 10⁶
(b) 3.6 x 10⁶
(c) 30.6 x 10⁶
(d) 3.6 x 1O⁵
Answer:
(b) 3.6 x 10⁶

Question 4.
The voltage difference in India between the live and neutral wires is about ………….. .
(a) 110 V
(b) 220 V
(c) 440 V
(d) 60 V
Answer:
(b) 220 V

Question 5.
Resistivity is the specific property of a ………….. .
(a) Area of cross-section
(b) Temperature
(c) Length
(d) Material
Answer:
(d) material

Question 6.
If a P.D. of 12 V is applied across a 3Ω resistor then the current passing through it is ………….. .
(a) 36 A
(b) 4 A
(c) 0.25 A
(d) 15 A
Answer:
(b) 4 A.

Question 7.
In order to measure the electric current flowing through a circuit, we connect …………… with the circuit.
(a) a voltmeter in parallel
(b) a voltmeter in series
(c) an ammeter in parallel
(d) an ammeter in series
Answer:
(d) an ammeter in series

Question 8.
P and Q are two wires of same length and different cross-sectional areas and made of same material. Name the property which is same for both the wires.
(a) Resistivity
(b) Resistance
(c) Current
(d) Both (a) and (b)
Answer:
(a) Resistivity

Question 9.
The following is true for identical bulbs connected in parallel.
(a) All bulbs glow with unequal brightness.
(b) If one bulb is non-functional, all will stop working.
(c) All bulbs glow with equal brightness.
(d) Bulbs function for longer time.
Answer:
(c) All bulbs glow with equal brightness

Question 10.
The …………… wire is either yellow or green in colour.
(a) Live
(b) Neutral
(c) Earth
(d) Fuse
Answer:
(c) earth

Question 11.
A current flows through a circuit due to the difference in …………… between two points in the conductor.
(a) Gravity
(b) Potential
(c) Resistance
(d) Fuse
Answer:
(b) potential

Question 12.
…………… is the amount of charge flowing through a particular cross sectional area in unit time.
(a) Electric current
(b) Ampere
(c) Volt
(d) Force
Answer:
(a) Electric current

Question 13.
The flow of …………… constitutes the electric current in a wire.
(a) Protons
(b) Neutrons
(c) Electrons
(d) Gravitons
Answer:
(c) electrons

Question 14.
The conventional direction of flow of current is from …………… terminal to …………… terminal.
(a) Negative to positive
(b) Neutral to positive
(c) Positive to negative
(d) Positive to neutral
Answer:
(c) positive, negative

Question 15.
Current stops flowing when potential difference between two ends of a wire becomes ………….. .
(a) Zero
(b) Positive
(c) Negative
(d) Higher
Answer:
(a) zero

Question 16.
Resistances are connected in …………… so as to pass the same current through them.
(a) Series
(b) Parallel
(c) Reversed
(d) Disconnect
Answer:
(a) series

Question 17.
To decrease the effective resistance in a circuit, the resistances are connected in ………….. .
(a) Series
(b) Parallel
(c) Reversed
(d) Disconnect
Answer:
(b) parallel

Question 18.
1μV = …………… V
(a) 10²
(b) 10^-6
(c) 10⁶
(d) 10³
Answer:
(b) 10^-6

Question 19.
Good conductors contain a large number of ………….. .
(a) Protons
(b) Neutrons
(c) Electrons
(d) Gravitons
Answer:
(c) free electrons

Question 20.
Electrons flow from …………… terminal to …………… terminal in a conductor when a potential difference is applied.
(a) Negative to positive
(b) Neutral to positive
(c) Positive to negative
(d) Positive to neutral
Answer:
(a) negative, positive

Find the odd one out:

Question 1.
Voltmeter, Ammeter, Galvanometer, Thermometer
Answer:
Thermometer

Question 2.
Rubber, Silver, Copper, Gold
Answer:
Rubber

Question 3.
Wood, Glass, Steel, Rubber
Answer:
Steel

Question 4.
Graphite, Diamond, Fullerenes, Coal
Answer:
Fullerenes

Distinguish between:

Question 1.
Voltmeter and Ammeter
Answer:

Question 2.
Ohmic conductors and Non-Ohmic conductors
Answer:

Question 3.
Conductors and Insulators
Answer:

Question 4.
Resistance in Series and Resistance in Parallel
Answer:

Question 5.
Answer:

Make pair:

Question 1.
Copper : Conductor :: Rubber : ……………….
Answer:
Insulator

Question 2.
Aluminium : ………………. :: Indium oxide : Super Insulator
Answer:
Super conductor

Question 3.
Parallel Connection : \(\frac{1}{\mathrm{R}_{p}}=\frac{1}{\mathrm{R}_{1}}+\frac{1}{\mathrm{R}_{2}}\) :: Series Connection : ……………….
Answer:
R_s = R₁ + R₂

(4) Electric Current : ………………. :: Electric charge : Coulomb
Answer:
Ampere

(5) Electric resistance : Ohm :: Potential difference : ……………….
Answer:
Volt

State whether the following statements are true or false. Correct the false statements:

(1) The SI unit of charge is volt.
(2) Voltmeter is always connected in series with the device.
(3) The conventional direction of flow of current is from positive terminal to negative terminal.
(4) Silver and copper are good conductors.
(5) Resistivity of pure metals is more than alloys.
(6) Resistance in series arrangement is used to decrease resistance of circuit.
(7) A conducting wire offers less resistance to flow of electrons.
(8) Charges are measured in ampere.
(9) The unit of potential difference is ampere.
(10) Resistance of a conductor is inversely proportional to the length of the conductor.
(11) Ammeter is connected in parallel to the cell to measure current.
(12) Fuse is made of wire having high melting point.
Answer:
(1) False. The SI unit of charge is coulomb.
(2) False. Voltmeter is ahvays connected in parallel with the device.
(3) True
(4) True
(5) False. Resistivity of pure metals is less than alloys.
(6) False. Resistance in series arrangement is used to increase resistance of circuit.
(7) True
(8) False. Charges are measured in coulomb.
(9) False. The unit of potential difference is volt.
(10) False. Resistance of a conductor is directly proportional to the length of the conductor.
(11) False. Ammeter is connected in series to the cell to measure current.
(12) False. Fuse is made of wire having low melting point.

Answer the following in one sentence:

Question 1.
Which is the unit used to measure large voltages?
Answer:
Kilovolts and Megavolts are the units used to measure large voltages.

Question 2.
What is the SI unit of potential difference?
Answer:
The SI unit of potential difference is volt (V).

Question 3.
What is lightning?
Answer:
Lightning is the electric discharge travelling from clouds at high potential to earth’s surface which is at zero potential.

Question 4.
What is the unit of resistivity.
Answer:
The unit of resistivity is ohm metre (Qm).

Question 5.
Which substances are called conductors of electricity?
Answer:
Those substances which have very low electrical resistance are called conductors of electricity.

Question 6.
What is Earth wire?
Answer:
Earth wire is generally yellow or green colour, it is connected to a metal plate buried deep underground near the house and is for safety purpose.

Write formula:
(1) E1ectriccurrent \(=\frac{Q}{t}\)
(2) Electric charge = It
(3) Potential difference = IR
(4) Electric resistance \(=\frac{V}{I}\)
(5) Current \(=\frac{V}{R}\)
(6) Resistivity \(=\frac{RA}{L}\)

Give scientific reasons:

Question 1.
Free electrons are required for conduction of electricity.
Answer:

• Every atom of a metallic conductor has one or more outermost electrons which are very weakly bound to the nucleus.
• These are called free electrons. These electrons can easily move from one part of a conductor to its other parts. The negative charge of the electrons also gets transferred as a result of this motion.
• The free electrons in a conductor are the carriers of negative charge. Hence, free electrons are required for conduction of electricity.

Question 2.
Wood and glass are good insulators.
Answer:

• Those substances which have infinitely high electrical resistance are called insulators.
• Wood and glass have high resistance and negligible free electrons for conduction of electricity.
• Hence, wood and glass are good insulators.

Question 3.
Connecting wires in a circuit are made of copper and aluminium.
Answer:

• Copper and aluminum are good conductors of electricity.
• They have low electrical resistance and large number of free electrons.
• As they are malleable and ductile, they can be drawn into thin wires. Hence, connecting wires in a circuit are made of copper or aluminum.

Question 4.
A thick wire has a low resistance.
Answer:

• The resistance (R) of a wire is inversely proportional to the cross-sectional area (A) of a wire. i.e., R i
• Thus, greater is the cross-sectional area of a conductor (wire), lower is its resistance. Hence, a thick wire has a low resistance.

Question 5.
A series combination of resistances is used to increase the resistance of a circuit.
Answer:

• When resistances are connected in series, the effective resistance of the resistors is equal to the sum of their individual resistances. R_s = R₁ + R₂ ………….. R_n
• The effective resistance is larger than each of the individual resistances. Hence, This arrangement is used to increase the resistance in a circuit.

Question 6.
A parallel combination of resistances decreases the effective resistance of the circuit.
Answer:

• In a parallel combination, the inverse of the effective resistance is equal to the sum of the inverses of individual resistances. \(\frac{1}{\mathrm{R}_{\mathrm{p}}}=\frac{1}{\mathrm{R}_{1}}+\frac{1}{\mathrm{R}_{2}} \ldots \ldots \cdot \frac{1}{\mathrm{R}_{\mathrm{n}}}\)
• The effective resistance of resistors connected in parallel is less than the individual resistors.
• Due to this, any addition of an individual resistance in parallel combination will decrease the overall resistance of the circuit. Hence, a parallel combination of resistance decreases the effective resistance of the circuit.

Question 7.
Lightning occurs from sky to earth.
Answer:

• Lightning is the electric discharge travelling from clouds at high potential to the earth’s surface, which is at zero potential.
• The earth is always at lower potential as compared to the clouds.
• Hence, lightning occurs from sky to earth.

Question 8.
In streetlights, bulbs are connected in parallel.
Answer:

1. Even if any one of the several bulbs connected in parallel becomes non-functional because of some damage to its filament, the circuit does not break as the current flows through the other paths, and the rest of the bulbs light up.
2. When several bulbs are connected in parallel, they emit the same amount of light as when they are connected individually in the circuit, while bulbs connected in series emit less light than when connected individually. Hence, streetlights are connected in parallel.

Numerical:
Numericals based on the formula: (1) Q= It (2) W= VQ

Question 1.
A current of 0.4 A flows through a conductor for 5 minutes. How much charge would have passed through the conductor?
Answer:
Given: Current (I) = 0.4 A
Time (t) = 5 min = 5 x 60 = 300 s
To find: Charge (Q) =?
Formula: Q = 1 x
Solution: Q = 0.4 x 300
Q= 120 C.
Charge passing through the conductor is 120

Question 2.
Find the amount of work done if 3 C of charge is moved through a potential difference of 9 V.
Answer:

The work done is 27 joule.

Question 3.
The resistance of the filament of a bulb is 1000Ω. It is drawing a current from a source of 230 V. How much current is flowing through it?
Answer:

The current flowing through the filament of bulb is 0.23 A.

Question 4.
The length of a conducting wire is 50 cm and its radius is 0.5 mm. If its resistance is 30Ω, what is the resistivity of its material?
Answer:


The resistivity of the wire is 4.71 x 10^-5 Qm.

Question 5.
A current of 0.24 A flows through a conductor when a potential difference of 24 V is applied between its two ends. What is its resistance?
Answer:

The resistance of a conductor is 100Ω.

Question 6.
If three resistors 15Ω, 3Ω and 4Ω each are connected in series, what is the effective resistance in the circuit?
Answer:
Given:
R₁ =15Ω
R₂ = 3Ω
R₃ = 4Ω
Effective resistance in series (R_s) = ?
R_s = R₁ + R₂ + R₃
R_s = 15 + 3 + 4
R_s = 22Ω
The effective resistance in the circuit is 22Ω.

Question 7.
Three resistances 15Ω, 20Ω and 10Ω are connected in parallel. Find the effective resistance of the circuit.
Answer:


The effective resistance of the circuit is 4.615 Ω. It is less than the least of the three i.e., 10Ω.

Write a note on the following:

Question 1.
Electric current
Answer:
An electric current is the flow of electrons through a conductor. Quantitatively, current
(I) is defined as the charge passing through a conductor in unit time.
\(T=\frac{Q}{t}\)

Question 2.
1 ampere
Answer:
One ampere current is said to flow in a conductor if one coulomb charge flows through it every second.
\(1 \mathrm{~A}=\frac{1 \mathrm{C}}{1 \mathrm{~s}}\)

Question 3.
1 volt
Answer:
The potential difference between two points is said to be 1 volt if 1 joule of work is done in moving 1 coulomb of electric charge from one point to another.
\(1 \mathrm{~V}=\frac{1 \mathrm{~J}}{1 \mathrm{C}}\)

Question 4.
Potential Difference
Answer:
The amount of work done to carry a unit positive charge from point A to point B is called the electric potential difference between the two points.
\(V=\frac{W}{Q}\)

Question 5.
Conductor
Answer:
Those substances which have very low resistance are called conductors. Current can flow easily through such materials.

Question 6.
Insulators
Answer:
Those substances which have extremely high resistance and through which current cannot flow are called insulators.

Question 7.
1 ohm
Answer:
If one Ampere current flows through a conductor when one Volt potential difference is applied between its ends, then the resistance of the conductor is one Ohm.
\(\frac{1 \text { Volt }}{1 \text { Ampere }}=1 \mathrm{Ohm}\)

Question 8.
Potential
Answer:
The level of electric charge present is known as potential.

Question 9.
Ohm’s Law
Answer:
If the physical state of a conductor remains constant, the current (I) flowing through it is directly proportional to the potential difference (V) between its two ends.
V = IR

Question 10.
Superconductors
Answer:
The resistance of some conductors becomes nearly zero if their temperature is decreased up to a certain value close to 0 K. Such conductors are called superconductors.

Question 11.
Non-ohmic conductors
Answer:
Conductors which do not obey Ohm’s law are called non-ohmic conductors.

Complete the flow charts:

(1) Protection from Electricity

(2) Resistance

(3) Resistivity

Write properties/characteristics/advantages of the following:

Superconductors
Answer:
The resistance of these conductors becomes nearly zero if their temperature is decreased up to a certain value close to 0 K. Aluminium is an example of Super Conductor. Superconductors can be used in space missions to increase/ boost the signal strength. They are also used i in the data fibres to increase the speed of data transfer.

Give explanations of the given statements:

Question 1.
Safety precautions are to be taken while using electricity.
Answer:

• Electric switches and sockets should be fitted at a height at which small children cannot reach and put pins or nails inside. Plug wires should not be pulled while removing a plug from its socket.
• Before cleaning an electrical appliance it should be switched off and its plug removed from the socket.
• One’s hands should be dry while handling an electrical appliance, and, as far as possible, one should use footwear with rubber soles.
• As rubber is an insulator, it prevents the current from flowing’ through our body, thereby protecting it.
• If a person gets an electric shock, you should not touch that person. You should switch off the main switch or remove the plug from the socket if possible.
• If not, then you should use a wooden pole to push the person away from the electric wire.

Question 2.
In a domestic circuit colour code is followed while setting up electrical wiring.
Answer:

• The electricity in our homes is brought through the main conducting cable either from the electric pole or from underground cables.
• Usually, there are three wires in the cable.
  (a) Live wire which brings in the current. It has a red or brown insulation.
  (b) Neutral wire through which the current returns. It is blue or black.
  (c) Earth wire is of yellow or green colour. This is connected to a metal plate buried deep underground near the house and is for safety purposes.
• In India, the voltage difference between the live and neutral wires is about 220 V.
• Live and neutral wires are connected to the electric meter through a fuse.
• They are connected through a main switch, to all the conducting wires inside the home so as to provide electricity to every room.
• In each separate circuit, various electrical appliances are connected between the live and neutral wires.
• The different appliances are connected in parallel and the potential difference across every appliance is the same.

Question 3.
Fuse used in electrical circuit can save electrical objects from damage.
Answer:

• Fuse wire is used to protect domestic appliances.
• It is made of a mixture of substances and has a specific melting point.
• It is connected in series to the electric appliances. If for some reason, the current in the circuit increases excessively, the fuse wire gets heated and melts.
• The circuit gets broken and the flow of current stops, thus protecting the appliance.
• This wire is fitted in a groove in a body of porcelain-like non-conducting material. For domestic use, fuse wires with upper limits of 1 A, 2 A, 3 A, 4 A, 5 A and 10 A are used.

Question 4.
Bulbs arranged in parallel glow brighter than bulbs arranged in series.
Answer:

• The amount of light given out by bulbs in parallel combination will be more than that in series combination.
• In parallel combination the resistance of the overall circuit decreases whereas in series it increases, so the current flowing through the bulbs in parallel circuit is more.
• Due to this, intensity of light given out by bulbs in parallel combination is more than the bulbs in series combination.

Complete the following table:
Answer:

Solve the numerical:

Question 1.
The length of a conducting wire is 50 cm and its radius is 0.5 mm. If its resistance is 30Ω, what is the resistivity of its material?
Answer:

The resistivity of the wire is 4.71 x 10^-5 Ωm.

Question 2.
Determine the current that will flow when a potential difference of 33 V is applied between two ends of an appliance having a resistance of 110 Ω. If the same current is to flow through an appliance having a resistance of 500 Ω, how much potential difference should be applied across its two ends?
Answer:

The current is 0.3 A and potential difference to be applied is 150 V.

Question 3.
Determine the resistance of a copper wire having a length of 1 km and diameter of 0.5 mm.
Answer:
Given: Resistivity of copper (p)
= 1.7 x 10^-8 Ω m
Converting all measures into metres.
Length of wire (L) = 1 km
= 1000 m = 10³ m
Diameter of wire (d) = 0.5 mm
= 0.5 x 10^-3m
To find: Resistance of wire (R) = ?
Formula:
\(R=\rho \frac{L}{A}\)
Solution:
If d is the diameter of the wire then, its area of cross-section

The resistance of a copper wire is 85Ω and area of cross section is 0.2 x 10^-6 m²

Question 5.
Two resistors having resistance of 16 and 14 are connected in series. If a potential difference of 18 V Is applied across them, calculate the current flowing through the circuit and the potential difference across each individual resistor.
Answer:


The current in the circuit is 0.6 A and potential across 16 Ω retor is 9.6 volt and 14 Ω resistor is 8.4 voIt.

Question 6.
If the resistors 5 Ω, 10 Ω and 30 Ω are connected in parallel to battery of 12 V, find the effective resistance in the circuit. Calculate the total current and current in each resistor.
Answer:


(a) The total current is 4 A and current in each resistor is 2.4 A, 1.2 A and 0.4 A respectively.
(b) The effective resistance in the circuit is 3Ω.

Complete the diagram and answer the questions:

Question 1.
The following figure shows the symbols for components used in the accompanying electrical circuit.

(a) Place them at proper places and complete the circuit.
(b) Which law can you prove with the help of the above circuit?
(c) State expression for Ohm’s law
Answer:

(b) This circuit can be used to prove Ohm’s law.
(c) V = IR is the expression of Ohm’s law

Question 3.
Explain with the help of a diagram, what are free electrons and how they move through the conductor?

Answer:

• Every atom of a metallic conductor has one or more outermost electrons which are very weakly bound to nucleus.
• These are called free electrons.
• These electrons can easily move from one part of a conductor to its other parts.

Complete the paragraph:

Question 1.
If resistors are connected in series,
Answer:
The same current flows through each resistor. The effective resistance of the resistors is equal to the sum of their individual resistances. The potential difference between the two extremes of the arrangement is equal to the sum of the potential differences across individual resistors. The effective resistance is larger than each of the individual resistances. This arrangement is used to increase the resistance in a circuit. This type of connection is used in electrical heating equipment like geysers, iron, and hair dryers.

Question 2.
If a number of resistors are connected in parallel,
Answer:
The inverse of the effective resistance is equal to the sum of the inverses of individual resistances. The current flowing through an individual resistor is proportional to the r inverse of its resistance and the total current flowing through the circuit is the sum of the currents flowing through individual resistors. The potential difference across all r resistors is the same. The effective resistance of resistors connected in parallel is less than r the least resistance of individual resistors.

This arrangement is used to reduce the resistance in a circuit. Even if any one of the several bulbs connected in parallel becomes non-functional because of some damage to its filament, the circuit does not break as the current flows, through the other paths, and the rest of the bulbs light up. When several bulbs are connected in parallel, they emit the same amount of light as when they are connected individually in the circuit, while bulbs connected in series emit less light than when connected individually.

Read the paragraph and answer the questions.

Electric switches and sockets should be fitted at a height at which small children cannot reach and put pins or nails inside. Plug wires should not be pulled while removing a plug from its socket. Before cleaning an electrical appliance it should be switched off and its plug removed from the socket. One’s hands should be dry while handling an electrical appliance, and, as far as possible, one should use footwear with rubber soles. As rubber is an insulator, it prevents | the current from flowing through our body, thereby protecting it. If a person gets an electric shock, you should not touch that person. You should switch off the main switch and if the switch is too far or you do not know where it is located, then you should remove the plug from the socket if possible. If not, then you should use a wooden pole to push the person away from the electric wire.

(i) Why should the electrical sockets be fitted at a certain height?
Answer:
Electric switches and sockets should be fitted at a height at which small children cannot reach and put pins or nails inside.

(ii) Why plug wires should not be pulled out while removing any electrical device?
Answer:
Plug wires should not be pulled out while removing any electrical device as it may cause the wire to break causing short circuit which can lead to fire or death.

(iii) Why should a person wear footwear with rubber soles while handling electrical appliances. .
Answer:
As rubber is an insulator, it prevents the current from flowing through our body, thereby protecting it. Hence a person should wear footwear with rubber soles while handling electrical appliances.

(iv) Saee is touching an electrical button socket with wet hands what will you advise her and why?
Answer:
We will advise her to dry her hands before touching any electrical sockets or devices as water on the hands can cause an electrical short circuit producing shock to the person touching it.

(v) Sneha is getting an electrical shock what will you do the save her life?
Answer:
We should switch off the main switch and if the switch is too far or we do not know where it is located, then we should remove the plug from the socket if possible. If not, then we should use a wooden pole to push the person away from the electric wire.

(vi) Give a title to the above passage.
Answer:
Precautions to be taken while using electricity

Answer the questions in details:

Question 1.
Find the expression (i.e., derive the expression) for the resistors connected in series.
Answer:
Expression for the resistance connected in series:
(i) Let R₁, R₂ and R₃ be three resistances connected in series between C and D.
(ii) Let R_s be the effective resistance in circuit and V₁, V₂ and V₃ be the potential difference across R₁, R₂ and R₃ respectively.
(iii) Let the potential difference across CD be V.

(iv) In series combination.
v = v₁ + v₂ + v₃ ……………………(i)
By using Ohm’s law
V = IR_s
∴ V₁= IR₁, V₂ = IR₂ and V₃ = 1R₃
Substituting these values in equation (j) we get
IR_s = IR₁ + IR₂ + IR₃
∴ R_s = R₁ + R₂ + R₃
For ‘n’ number of resistors conneded in series we get
R_s = R₁ + R₂ + R₃ + …………………. + R_n

Question 2.
Find the expression (i.e., derive the expression) for the resistors connected in parallel.
Answer:
Expression for the resistance connected in parallel.
(i) Let R₁, R₂ and R₃ be the three resistances connected in parallel combination between points C and D and let R be their effective resistance.
(ii) Let I₁, I₂ and I₃ be the currents flowing through resistances R₁, R₂ and R₃ respectively. Let I be the current flowing through the circuit and V be the potential difference of the cell.

(iii) For parallel combination of resistances,

(iv) Substituting the values of (I, I₁, I₂ and I₃) in equation (i) we get

Question 3.
Find the expression for resistivity of a material.
Answer:
(i) At a given temperature, the resistance (R) of a conductor depends on its length (L), area of cross-section (A) and the material it is made of. If the resistance of a conductor is R, then

(ii) p is the constant of proportionality and is called the resistivity of the material.
(iii) The unit of resistivity in SI units is Ohm metre (Ω m).
(iv) Resistivity is a specific property of a material and different materials have different resistivity. ’

Make the concept diagram and explain:

Question 1.
Make the concept diagram of an electrical circuit and explain the working of a fuse.

Answer:

• Fuse wire is used to protect domestic appliances.
• It is made of a mixture of substances and has a specific melting point.
• It is connected in series to the electric appliances. If for some reason, the current in the circuit increases excessively, the fuse wire gets heated and melts. The circuit gets broken and the flow of current stops, thus protecting the appliance.
• This wire is fitted in a groove in a body of porcelain-like non-conducting material. For domestic use, fuse wires with upper limits of 1A, 2A, 3A, 4A, 5A, and lO Aareused.

(2) Show motion of electrons in an circuit and explain precautions while using an electrical device.
Answer:

• Electric switches and sockets should be fitted at a height at which small children cannot reach and put pins or nails inside. Plug wires should not be pulled while removing a plug from its socket.
• Before cleaning an electrical appliance it should be switched off and its plug removed from the socket.
• One’s hands should be dry while handling an electrical appliance, and, as far as possible, one should use footwear with rubber soles.
• As rubber is an insulator, it prevents the current from flowing through our body, thereby protecting it.
• If a person gets an electric shock, you should not touch that person. You should switch off the main switch or remove the plug from the socket if possible.
• 1f not, then you should use a wooden pole to push the person away from the electric wire.

Q.4.4.Complete the incomplete figure and give an explanation:

Answer:

If the physical state of a conductor remains constant, the current (I) flowing through it is directly proportional to the potential difference (V) between its two ends.

I α V
I = kV (k = constant of proportionality)

This is known as Ohm’s law.
We can obtain the SI unit of resistance from the above formula, Potential difference and current are measured in Volts and Amperes respectively. The unit o resistance is called Ohm. It is indicated by the symbol Ω.

The resistance of one Ohm : If one Ampere current flows through a conductor when one Volt potential difference is applied between its ends, then the resistance of the conductor is one Ohm.

Balbharti Maharashtra State Board Class 9 Political Science Solutions Chapter 2 India’s Foreign Policy Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 9 Political Science Solutions Chapter 2 India’s Foreign Policy

Class 9 Political Science Chapter 2 India’s Foreign Policy Textbook Questions and Answers

1. Choose the right option and rewrite the sentence:

Question 1.
This was the main objective behind establishing the Indian Atomic Energy Commission ________.
(a) Enhance military capacity
(b) Conduct nuclear tests
(c) To stop the proliferation of nuclear weapons
(d) Production of atomic energy
Answer:
(a) Enhance military capacity

Question 2.
The following is now the objective of all the nations of the world _____.
(a) atomic development
(b) economic development
(c) nuclear test
(d) security system
Answer:
(b) economic development

Question 3.
The is an important aspect of India’s foreign policy _______.
(a) free economic policy
(b) interdependence
(c) non-alignment
(d) nuclear development
Answer:
(c) non-alignment

Question 4.
India coriducted nuclear tests in 1974 at ______.
(a) Sriharikota
(b) Thumba
(c) Pokharan
(d) Jaitapur
Answer:
(c) Pokharan

2. Explain with reasons whether the following statements are true or false:

Question 1.
Pandit Nehru contributed towards improving Sino-Indian relations.
Answer:
True.
Self-opinion based

• Pandit Nehru formulated Panchsheel which was a treatise of the five principles of peaceful coexistence to govern relations between India and China. The first formal codification in the form of a treaty was an agreement between China and India in 1954.
• Mutual non-interference in internal affairs, mutual non-aggression, equality of mutual benefit, mutual respect, and peaceful co-existence were the principles for seeking peace with China.
• Nehru backed China’s permanent membership in the United Nations Security Council.
• Though Nehru had a policy of improving Sino- Indian relations, China attacked India in 1962.

Question 2.
Atal Bihari Vajpayee took lead in improving relations with Pakistan.
Answer:
True.
Evaluative, self-opinion based

• In an effort to develop friendly relations, India and Pakistan have started a bus service called ‘Sada-e-Sarhad’ (Call of the border) between Delhi and Lahore when Atal Bihari Vajpayee was the Prime Minister. He also revived the train called Samjhauta Express (Friendship Express).
• Atal Bihari Vajpayee rendered help to the earthquake victims of Pakistan during the rule of Pervez Musharraf.
• In 1999, there was another war between India and Pakistan in the Kargil region over the Kashmir issue. India defeated Pakistan in this war as well.
• Atal Bihari Vajpayee tried to establish a dialogue with Pakistan but was not successful.

3. Explain the following concepts:

Question 1.
India’s Foreign Policy.
Answer:
(i) India got independence in 1947 and from then onwards India started shaping its Foreign Policy independently.
(ii) Article 51 among the Directive Principles of State Policy lay down the broad framework for Foreign Policy.
(iii) According to it, India should give priority to safeguard international peace and security, and resolve our international problems and disputes by peaceful means.
(iv) The objectives of our Foreign Policy should be to maintain friendly relations with other nations and respect international law.

Question 2.
National Interest
Answer:
(i) National interest implies the means through which the independence and sovereignty of our country can be safeguarded.

(ii) National interest also includes efforts to achieve our economic development and to take steps towards increasing our national power.

(iii) When decisions are taken after giving careful thought to what is beneficial and good for our country, we say that we are nurturing our national interest.

Question 3.
World Peace
Answer:
(i) World peace is an ideal state of freedom, peace, and happiness among and within all nations and people.
(ii) This idea of world non-violence provides a basis for peoples and nations to willingly co-operate.
(iii) Either voluntarily or by virtue of a system of governance, that prevents warfare.
(iv) India has been consistently supporting efforts for disarmament because it is India’s policy that there should be peace and security.

4. What is your opinion about the fact that world peace is threatened due to nuclear preparedness?
Answer:
Nuclear preparedness leads to an Arm’s Race. It increases the possibilities of wars.
(i) If a nuclear bomb exploded in a major city, the blast center would be hotter than the surface of the sun.
(ii) Survivors would have no electricity, no transportation, no phones, and hospitals would be overwhelmed if they were still standing
(iii) India is now a country that has nuclear weapons. We have accepted the role of a responsible nuclear power. India has been consistently supporting efforts for disarmament because it is India’s position that there should be peace and security in the world.

5. Answer the following questions in brief:

Question 1.
On what principles is India’s foreign policy based?
Answer:
(i) India got independence in 1947 and from then onwards we started shaping our foreign policy independently.

(ii) The Directive Principles of State Policy have laid down guidelines about how to shape Foreign Policy. Article 51 among the Directive Principles of State Policy lay down the broad framework for foreign policy.

(iii) According to it, India should give priority to safeguard international peace and security, and resolve our international problems and disputes by peaceful means.

(iv) The objectives of our foreign policy should be to maintain friendly relations with other nations and respect international law. India’s Foreign Policy till now has been developed in this framework.

Question 2.
Who has contributed to improving Sino- Indian relations?
Answer:
(i) Prime Minister Atal Bihari Vajpayee contributed a great deal to improving Sino-Indian relations.
(ii) The President, the Prime Minister, the Foreign Minister, the Defence Minister, the Finance Minister, and the Home Minister have a role in deciding foreign policy.
(iii) The persons holding these positions try to maintain the continuity in Foreign Policy and to improve upon it.

Question .3
Write the objectives of India’s Foreign Policy.
Answer:
Objectives of India’s Foreign Policy are as follows:

• While maintaining friendly relations with neighboring countries, ensure that the defense and security of India are not affected.
• Not to compromise about the geographical boundaries of the nation.
• Protect the unity and integrity of the country.
• Protect the interests of India’s citizens living in other countries. This responsibility is fulfilled by the Indian embassies there.
• To establish economic and commercial relations with other countries for achieving the economic development of India.

6. Prepare the following concept map:

Question 1.

Answer:

Class 9 Political Science Chapter 2 India’s Foreign Policy Additional Important Questions and Answers

Choose the correct option from the given options and rewrite the sentence:

Question 1.
Prime Minister ______ shaped India’s Foreign Policy during the early period.
(a) Pandit Jawaharlal Nehru
(b) Dr. Manmohan Singh
(c) Atal Bihari Vajpayee
(d) Rajiv Gandhi
Answer:
(a) Pandit Jawaharlal Nehru

Question 2.
Foreign policy is framed to establish economic and _____ relations with other countries for achieving economic development of India,
(a) Social
(b) Commercial
(c) Economic
(d) All of above
Answer:
(b) Commercial

Question 3.
The period from independence to ____ can be considered as the first stage.
(a) 1984
(b) 1990
(c) 1992
(d) 2011
Answer:
(b) 1990

Question 4.
Peace and ______ became the fundamental principles of Non-Aligned Policy.
(a) justice
(b) freedom
(c) relations
(d) power
Answer:
(b) freedom

Question 5.
The first Chairman of the Indian Atomic Energy Commission was ______.
(a) Dr. Vikram Sarabhai
(b) Dr. A.P.J.Abdul Kalam
(c) Dr. Homi Bhabha.
(d) Dr. Manmohan Singh.
Answer:
(c) Dr. Homi Bhabha.

Question 6.
After ________, India reduced the government controls over the economy and adopted the free-market policy.
(a) 1992
(b) 1991
(c) 1984
(d) 1957
Answer:
(b) 1991

Question 7.
In the decade after 1990, our relations with the South Asian countries like ______, Thailand, Vietnam, etc. became stronger.
(a) China
(b) Japan
(c) Indonesia
(d) Singapore
Answer:
(d) Singapore

State whether the following statements are true or false with reasons:

Question 1.
Foreign Policy is always dynamic.
Answer:
True.

• Foreign Policy is drawn up to foster the national interest of defence and economic development.
• National interest is considered to be the goal and foreign policy is considered to be the means to achieve it.
• Goals of nations change with changes in conditions and time.
• Accordingly, national interest also changes.
• These changes are reflected in foreign policy. Therefore, foreign policy is always dynamic.

Question 2.
India has not signed NNPT or CTBT.
Answer:
True.

• Nuclear weapons are extremely destructive.
• Hence, it is necessary to, make consistent efforts so that they are never used. Two treaties have been made to stop the spread of nuclear weapons.

1. Nuclear Non-Proliferation Treaty (NNPT)
2. Comprehensive Test Ban Treaty (CTBT).

• The conditions of both these treaties are of benefit to big nuclear powers and they put unfair restrictions on developing countries, hence India has not signed either of these treaties.

Explain the concept:

Question 1.
Objectives of India’s Foreign Policy.
Answer:
(i) While maintaining friendly relations with neighboring countries, ensure that the defense and security of India are not affected.
(ii) Protecting the unity and integrity of the country.
(iii) Protecting the interests of India’s citizens living in other countries. This responsibility is fulfilled by the Indian embassies there.
(iv) To establish economic and commercial relations with other countries for achieving economic development.

Question 2.
Role of Economy in Foreign Policy.
Answer:
(i) Foreign policy is shaped by the need to establish economic relations with other countries, import-export, participation in world trade, all aimed at strengthening the economy of the country.
(ii) In today’s world, the issues of economic security are as important as national security.
(iii) A country is recognized to be powerful in proportion to the economic security it enjoys.
(iv) Countries having a strong economy are less dependent on others, and they can have an independent foreign policy as well.

Question 3.
National leadership
Answer:
(i) The President, the Prime Minister, the Foreign Minister, the Defence Minister, the Finance Minister and the Home Minister have a role in deciding foreign policy.
(ii) The persons holding these positions try to maintain continuity in foreign policy and to improve upon it.
(iii) For example, Pandit Jawaharlal Nehru contributed the policy of non-alignment to India’s foreign policy.
(iv) Prime Minister Atal Bihari Vajpayee contributed a great deal to improving Sino-Indian relations.

Question 4.
Write about Article 51 of the Indian Constitution.
Answer:
(i) India got independence in 1947, and from then onwards we started shaping our foreign policy independently.
(ii) The Directive Principles of State Policy have laid down guidelines about how to shape foreign policy.
(iii) Article 51 among the Directive Principles of State Policy lay down the broad framework for foreign policy. According to it, India should give priority to safeguard international peace and security, and resolve our international problems and disputes by peaceful means.
(iv) The objectives of our foreign policy should be to maintain friendly relations with other nations and respect international law.

Do as directed:

Complete the list:

Question 1.
Complete the list by writing the contribution made by the following leaders. For example, Lai Bahadur Shastri: Tashkent Agreement
(i) Indira Gandhi: ____
(ii) Rajiv Gandhi : ____
(iii) Atal Bihari Vajpayee : _______
Answer:
(i) Indira Gandhi: Pokhran Nuclear Test.
(ii) Rajiv Gandhi: Science and Technology
(iii) Atal Bihari Vajpayee: Sino-Indian Relations

Question 2.
Name the Prime Minister who followed these policies?
(i) _____ : Look East
(ii) ______ : Efforts to increase Foreign Direct Investment
Answer:
(i) Pandit Jawaharlal Nehru: Look East
(ii) P. V. Narasimha Rao: Efforts to increase Foreign Direct Investment

Answer the following questions in brief:

Question 1.
Name the three things that influenced India’s foreign policy in the early phase.
Answer:
(i) Three things that influenced India’s foreign policy in this period.
(ii) We made an effort to understand all international events and developments independently, without any pressure from any power. Peace has always been a central feature of India’s foreign policy.
(iii) The threats from China and Pakistan were also taken into account.
(iv) One more feature of India’s foreign policy at this time was the insistence on self-reliance.

Question 2.
Flow did India promote the concept at regional development in the beginning?
Answer:
(i) In the beginning, India decided to improve relations with countries in Asia.

(ii) Efforts were taken to cooperate with Asian countries in order to achieve development and to keep our independence intact.

(iii) This concept of regional development later expanded to include Africa, as well.

(iv) But some Asian-African countries participated in the military pacts led either by America or the Soviet Union.

(v) This stopped the process of regional development. After this, countries of Asia and Africa, which did not participate in these military pacts supported the concept of non-alignment.

(vi) Peace and freedom became the fundamental principles of non-aligned policy.

Question 3.
Describe India’s relations with foreign nations post-1970.
Answer:
(i) In the decade of the 1970s, there came about some stability in India’s Foreign Policy.

(ii) India had risen as a powerful regional power in South Asia.

(iii) By conducting nuclear tests in 1974, India had also proved its nuclear capability.

(iv) From 1980, however, some changes began to take place. In order to increase cooperation among South Asian countries, South Asian Association for Regional Cooperation (SAARC) was established.

(v) India initiated a dialogue to improve relations with China. India also started interaction with America for cooperation in the field of security.

Question 4.
Name the three factors that influenced India’s foreign policy in the early phase.
Answer:
Three factors that influenced India’s foreign policy in the early period are:

1. We made an effort to understand all international events and developments independently, without any pressure from any power. Peace has always been a central feature of India’s foreign policy.
2. The threats from China and Pakistan were also taken into account.
3. One more feature of India’s foreign policy at this time was the insistence on self-reliance.

Question 5.
Write about Pandit Nehru’s contribution to India’s foreign policy in the early phase.
Answer:
Prime Minister Pandit Nehru shaped India’s foreign policy in the early period. He opposed colonialism through India’s foreign policy. He took an internationalist position and gave priority to global peace and security.

Question 6.
Describe the conflicts India had to face in its early phase of foreign policy.
Answer:
In the early period, India had to face conflict with neighbouring countries. Wars happened between India and Pakistan over the Kashmir question in 1947-48 and 1965. In the third war, which happened in 1971, Pakistan broke apart and independent Bangladesh was created.

Question 7.
Describe the important changes that took place in India’s foreign policy from the 1980s.
Answer:
From 1980, some important changes began to take place. In order to increase cooperation among South Asian countries, the South Asian Association for Regional Cooperation (SAARC) was established. India initiated a dialogue to improve relations with China. India also started interaction with America for cooperation in the field of security.

Question 8.
What is India’s role in regional development?
Answer:
(i) In the beginning, India decided to improve relations with countries in Asia.

(ii) Efforts were taken to cooperate with Asian countries in order to achieve development and to keep our independence intact.

(iii) This concept of regional development later expanded to include Africa as well.

(iv) But some Asian-African countries participated in the military pacts led either by America or the Soviet Union. This stopped the process of regional development.

(v) After this, countries of Asia and Africa, which did not participate in these military pacts supported the concept of Non-alignment.

Question 9.
Write about the Political system as a factor influencing India’s small Foreign Policy.
Answer:
(i) In a democratic political system, the nation’s Parliament plays a major role in evolving Foreign Policy.

(ii) When different aspects come up for discussion in Parliament, the opposition parties try to regulate the Foreign Policy by raising questions about the same.

(iii) Federal political systems have to take into account the inclinations of the constituent states while shaping Foreign Policy because the affairs in neighbouring nations affect constituent states.

(iv) For example, events in Sri Lanka may affect Tamil Nadu, and those in Bangladesh may affect West Bengal and the North-East Indian States.

Question 10.
Write about the administrative factors of India’s Foreign Policy.
Answer:
(i) Ministry of External Affairs, Foreign Secretary, embassies in different countries, Diplomatic officers, etc. are the administrative factors involved in creating Foreign Policy.

(ii) Even though the final decisions about Foreign Policy are taken by the Prime Minister and the Minister for External Affairs, the administrative machinery helps to arrive at that decision.

(iii) The administrative officers collect information needed to shape the foreign policy, analyze it and give appropriate advice based on it.

(iv) The National Security Advisor also completes this task.

Question 11.
Write a note on the first stage of India’s Foreign Policy 1947-1990.
Answer:
(i) India adopted the policy of non-alignment in the context of the cold war. As a result, priority was given to maintaining friendly relations with all nations and to taking the help required for development from different countries. Due to the policy of non-alignment, India could get aid from both the superpowers.

(ii) There was a lot of stress on improving/ strengthening India’s defence. The technology required for this was imported. Soviet Union, France, and Germany helped India in this matter.

(iii) In this period, India had to face some challenges. These included the conflict with Pakistan, the creation of Bangladesh, and the conflict with China.

(iv) India proved its nuclear capability by conducting nuclear tests in 1974.

Question 12.
Write a note on Geographical Location.
Answer:
(i) In the globe or map of the world. We see the geographical location of any nation of the world.

(ii) Some countries are far away from other countries, while there are several neighbouring countries around some countries. Some nations have a long coastline, while some have plenty of mineral wealth.

(iii) In sum, the size, population, topography, coastline, availability of natural resources, all these factors need to be considered while deciding the foreign policy of any country.

Question 13.
Describe the factors included in National interest in any country.
Answer:
The following factors are included in the national interest of any country.

• Defence, i.e. the protection of our country’s independence, sovereignty, and integrity is the highest national interest.
• Economic development is also an important national interest.
• An economically weak nation will not be able to maintain its independence.
• Hence, economic development is understood to be an important national interest, next only to defense.

Question 14.
Consider the developments of India’s Foreign Policy from 1991 till date.
Answer:
(i) India’s Foreign Policy became more comprehensive and dynamic in the second stage.

(ii) In the post-cold war period, the priority no longer remained on political and military relations.

(iii) Several other dimensions like the economy, trade, education, and technology got included in foreign policy.

(iv) After 1991, India reduced the government controls over the economy and adopted the free-market policy.

(v) In the decade after 1990, our relations with South Asian countries like Singapore, Thailand, Vietnam, etc. became stronger.

(vi) Our trade exchange with Israel, Japan, China, and European Union increased.

(vii) India began to participate in organizations at the international and regional levels more than before.

(viii) For example, G-20 and BRICS (Brazil, Russia, India, China, South Africa).

(ix) Our relations with America strengthened.

(x) India’s nuclear policy is an important part of India’s foreign policy. India undertook the nuclear energy program immediately after independence. India built nuclear weapons and conducted nuclear tests in 1998. India is now a country that has nuclear weapons.

Question 15.
State the importance of foreign policy.
Answer:
(i) Interdependence being a key feature in the international system each country has to decide the nations with which it should be friendly, in which bloc it should participate or what position it should take in international relations.

(ii) Such decisions should be made thoughtfully.

(iii) The theoretical framework in which such decisions are taken is called Foreign Policy.

(iv) Every sovereign and independent country decides its own Foreign Policy.

(v) Hence in the discipline of international politics, which studies international relations between nations, Foreign Policy has an important place.

Balbharti Maharashtra State Board Class 9 Political Science Solutions Chapter 1 Post World War Political Developments Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 9 Political Science Solutions Chapter 1 Post World War Political Developments

Class 9 Political Science Chapter 1 Post World War Political Developments Textbook Questions and Answers

1A. Choose the right option and rewrite the sentence:

Question 1.
A system of independent and sovereign states ___.
(a) Political system
(b) International system
(c) Social system
(d) None of these
Answer:
(b) International system

Question 2.
The main responsibility of the United Nations ____.
(a) to avoid war
(b) independence of colonies
(c) improving the economics of different nations
(d) disarmament
Answer:
(a) to avoid war

Question 3.
The Cold War ended with the event, _____.
(a) Establishment of the United Nations
(b) Disintegration of the Soviet Union
(c) Creation of Military Organisations
(d) Cuban Missile Crisis
Answer:
(b) Disintegration of the Soviet Union

2. Explain with reasons whether the following statements are true or false:

Question 1.
The League of Nations was established after the First World War.
Answer:
True.

• At the end of the First World War, all the nations felt that such a war should not happen again and some measures need to be taken to achieve that end.
• An international organisation called the League of Nations was established out of this thinking.
• It became an important platform to solve international disputes and carry out negotiations.
• The main responsibility of the League of Nations was understood to be to avoid war.

Question 2.
The world became unipolar due to the Cold War.
Answer:
False.

• During the Cold War, most countries of the world joined either of the two super power blocs (USA or USSR).
• Such a division of the nations of the world in two groups is bipolarisation.

Question 3.
The policies of Mikhail Gorbachev gave an impetus to democratisation.
Answer:
True.

• The Soviet Union adopted the policy of opening up the economy. The state loosened up its control of the economy.
• The then President of the Soviet Union Mikhail Gorbachev implemented the policies of Perestroika (Restructuring) and Glasnost (Openness).
• Due to these policies, the control over the media reduced.
• Important changes took place in political and economic spheres, i.e. these spheres, were restructured. This gave impetus to democracy.

3. Explain the following concepts:

Question 1.
Cold War
Answer:
(i) America and the Soviet Union, who were allies in the Second World War became competitors, as soon as the war was over.

(ii) The cooperation between them gave way to rivalry. This rivalry occupied a period of 40-45 years of international politics

(iii) There was no open war between these two countries; but there was such tension in their relations, that it seemed that a war would erupt any time.

(iv) The concept of Cold War is used to describe the condition where there is no actual war, but there are such tensions in the circumstances, that they may be responsible to cause war.

(v) In this period, America was already a super power, but the Soviet Union also tried to become a super power by making nuclear weapons and by increasing its military might.

(vi) The struggle for power, arms race, differences in ideologies, attitude of checkmating each other by strategies and counter-strategies gave rise to the Cold War.

Question 2.
Non-Aligned Movement
Answer:
(i) In the period of the Cold War, while the world was becoming bipolar, there were some countries which did not want to join the super power rivalry. Such nations decided to stay out of the cold war rivalry. Their policy is known as non-alignment.

(ii) The Asian and African countries, which became independent after the Second World War supported the idea of non-alignment.

(iii) This movement started from 1961 under the leadership of India’s Prime Minister Pandit Jawaharlal Nehru, President of Yugoslavia Marshall Tito, President of Egypt Gamal Abdal Nasser, President of Indonesia Dr. Sukarno and Prime Minister of Ghana Dr. Kwame Nkrumah.

(iv) The non-aligned Movement has opposed colonialism, imperialism and racism. It has encouraged the resolution of international disputes by peaceful means.

(v) India led this movement under the guidance of Pandit Jawaharlal Nehru. India continued to actively support the movement afterwards as well.

(vi) Even after the end of the Cold War, the importance of the movement has not reduced. The non-aligned movement is based on eternal principles of humanism, global peace and equality.

(vii) It has inspired the less developed countries to come together. It has encouraged the resolution of international disputes by peaceful means.

(viii) While taking a firm stand on disarmament, fostering human rights, the non-aligned movement put forth the problems of poor, undeveloped countries firmly. This movement made a demand of a New International Economic Order (NIEO).

Question 3.
Interdependence
Answer:
(i) All the countries of the world are dependent on each other for one reason or the other. However big, prosperous or developed a nation may be, it can never be self-sufficient to fulfill all its needs.

(ii) Even big nations have to depend upon other big and small nations. Thus, interdependence is an important feature of the international system, i.e. today’s global system.

Question 4.
Bipolarisation
Answer:
During the Cold War, most countries of the world joined either of the two super power blocks. Such a division of the nations of the world in two groups is bipolarisation.

Question 5.
Globalization
Answer:
(i) After the end of the Cold War, trade and economic relations between countries became more open. As it has been mentioned before, capital, labour, markets and information began circulating globally.

(ii) The give and take of ideas among people all over the world grew.

(iii) Due to the revolution in information technology, different events and developments began to be known everywhere.

(iv) The boundaries between nations did not remain as sacrosanct as they were before. All these processes are together called globalisation.

(v) Just as globalisation has brought us benefits, it has also caused losses. For example, as the economies of different countries got linked with each other, trade increased, economic unification grew, plenty of products became available in the markets; but (at the same time) the gap between the poor and rich nations did not reduce.

4. Give your opinion on the following topics:

Question 1.
What measures should the League of Nations have taken to avoid the Second World War?
Answer:
(i) League of Nations should have organised a military wing with the help of member nations to keep a check over the aggressors like Germany and Japan.

(ii) League should have reconsidered implementation of harsh term of treaties imposed on the losers to avoid the revengeful policies of dictators like Adolf Hitler.

Question 2.
Non-Alignment was necessary during the Cold War.
Answer:
(i) Yes. This was important to keep newly independent countries of Asia and Africa away from the super power rivalry.

(ii) Since these countries did not officially show allegiance to any super power, they freed themselves from the dominance of USA and USSR and could independently frame their foreign policies.

(iii) This further promoted peace and co-operation.

Question 3.
Human welfare was neglected due to the Cold War.
Answer:
(i) Yes, due to military alliances the world was gripped in the fear of a possible Third World War, which would have annihilated the entire human race.

(ii) Moreover the Arms Race diverted the resources and harnessed science for destruction rather than human welfare.

Question 4.
Which countries can emerge as super powers, in competition with America in present times?
Answer:
India and China could be future super powers.

5. Write brief answers:

Question 1.
Compare the First World War and the Second World War with the help of the following points.

Answer:

Question 2.
What were the factors responsible for the end of Cold War?
Answer:
The factors responsible for the end of Cold War are:

(i) The Soviet Union adopted the policy of opening up the economy. The State loosened up its control of the economy.

(ii) The then President of the Soviet Union Mikhail Gorbachev implemented the policies of Perestroika (Restructuring) and Glasnost (Openness). Due to these policies, the control over the media reduced.

(iii) As the East European countries under the influence of the Soviet Union adopted the capitalist and democratic paths, the Soviet Union disintegrated and several new nations were created out of it.

Question 3.
What major changes occurred in global politics after the end of the Cold War?
Answer:
(i) Major changes took place in world politics after the end of the Cold War. For example, America remained the only super power in world politics.

(ii) A conducive atmosphere prevailed for the growth in trade and economic relations between and among nations.

(iii) As all nations of the world decided to give priority to trade relations, the idea of giving ‘aid’ to other nations fell behind.

(iv) The United Nations now had to take more concrete steps to maintain global peace and security.

(v) Environmental protection, fostering of human rights, gender equality and management of natural calamities now acquired a global dimension.

Class 9 Political Science Chapter 1 Post World War Political Developments Additional Important Questions and Answers

Choose the correct option from the given options and rewrite the sentence:

Question 1.
President of Soviet Union who implemented ‘Perestroika’ and ‘Glasnost’ ______.
(a) Nikita Khrushchev
(b) Mikhail Gorbachev
(c) General Molotov
(d) Vladimir Lenin
Answer:
(b) Mikhail Gorbachev

Question 2.
Military organisation formed under dominance of USA ______.
(a) North Atlantic Treaty Organisation
(b) Warsaw Pact
(c) New International Economic Order
(d) Non-Aligned Movement
Answer:
(a) North Atlantic Treaty Organisation

Question 3.
Division of world into two power blocs is called ______.
(a) Globalisation
(b) Nuclear Escalation
(c) Bipolarisation
(d) Internationalism
Answer:
(c) Bipolarisation

Question 4.
Among the following ________ is not an Axis Power.
(a) Germany
(b) Italy
(c) Belgium
(d) Japan
Answer:
(c) Belgium

Question 5.
______ is an important event of the Cold War.
(a) Fashoda Incident
(b) Cuban Missile Crisis
(c) Wall Street Crash
(d) Red Menace
Answer:
(b) Cuban Missile Crisis

Question 6.
Non-aligned movement is opposed to ____.
(a) Racism
(b) Capitalism
(c) McCarthyism
(d) Nepotism
Answer:
(a) Racism

Question 7.
Non-aligned movement demanded establishment of _______.
(a) Association of South East Asian Nations
(b) League of Nations
(c) New International Economic Order (NIEO)
(d) European Union (EU)
Answer:
(c) New International Economic Order (NIEO)

Question 8.
The policy of Perestroika means restructuring and Glasnost means ______.
(a) strictness
(b) oneness
(c) massiveness
(d) openness
Answer:
(d) openness

State whether the following statements are True or False, with reasons:

Question 1.
A system of Independent States is called International System.
Answer:
True.

• Our social life and well being is dependent on others and mutual co-operation has a very important place in it.
• The same is true about society, and it applies to different nations as well. There are many independent nations in the world, like India.
• Some exchange and interaction goes on among these nations on a regular basis. These independent states also enter into treaties with each other.
• A system of all these independent, sovereign states that emerges is called an International System.

Question 2.
Interdependence is not an important feature of the International System.
Answer:
False.

• All the countries of the world are dependent on each other for one reason or the other. However big, prosperous or developed a nation may be, it can never be self-sufficient to fulfill all its needs.
• Even big nations have to depend upon each other and on smaller nations. Thus, interdependence is an important feature of the international system, i.e. today’s global system.

Question 3.
The Second World War proved to be far more destructive than the First World War.
Answer:
True.

• The Second World War was fought between 1939 and 1945. It proved to be far more destructive than the First World War.
• Not only was it more widespread compared to the First World War, but far more advanced technology was employed in this war.
• Countries which took part in the Second World War once again faced a situation of economic crisis.

Question 4.
Efforts towards arms control and disarmament happened during the Cold War.
Answer:
True.

• The Super Powers started producing arms on a large scale to outsmart each other.
• There started a rivalry to make more and more destructive weapons and to acquire the technology required for the same.
• But soon, both the Super Powers realised that the arms race may endanger international peace.
• Hence, efforts towards arms control and disarmament also happened during this period.

Question 5.
Non-alignment was an important movement during the Cold War.
Answer:
True.

• In the period of the Cold War, while the world was becoming bipolar, there were some countries which did not want to join the super power rivalry.
• Such nations decided to stay out of the cold war rivalry. Their policy is known as Non-alignment.
• Non-alignment was an important movement during the Cold War.
• The Asian and African countries, which became independent after the Second World War supported the idea of non-alignment.

Explain the concept:

Question 1
Military Organisation
Answer:
(i) During the Cold War, power struggle between USSR and USA created need for nations who will support their ideologies.

(ii) Thus, organisations were created for helping nations militarily and thus dragging them into either of the super power blocs for their hegemony.

(iii) The respective super powers took up the responsibility of the security of the countries joining the military organisations led by them.

(iv) NATO (North Atlantic Treaty Organisation) was a military organisation under the dominance of America, while the Warsaw Pact was a military organisation, under the command of the Soviet Union.

Do as directed/instructed:

Complete the charts.

Question 1.

Answer:

Question 2.

Answer:

Question 3.

Answer:

Answer in brief:

Question 1.
What were the effects of World War I?
Answer:
(i) The First World War was fought between 1914 and 1918. The war caused a tremendous loss of life and property. The countries which joined the war suffered tremendous economic losses.

(ii) Even the countries which did not join the war were impacted by the war. The economies of the victorious as well as the losing countries collapsed.

(iii) Earlier empires in Europe collapsed and new nations came into being.

(iv) Independence movements in European colonies changed hegemony of European Nations.

(v) League of Nations was established.

(vi) Autocratic regime came up in Germany Spain, Italy and other countries.

Question 2.
Describe America’s role in the Second World War.
Answer:
(i) America played a major role in the Second World War. It had manufactured nuclear weapons.

(ii) In order to end the war, it dropped two nuclear weapons on two cities of Japan – Hiroshima and Nagasaki on 6th and 9th August 1945 respectively.

Question 3.
What gave rise to the Cold War?
Answer:
(i) America was already a super power, but the Soviet Union also tried to become one, by making nuclear weapons and by increasing its military might.

(ii) The struggle for power, arms race, differences in ideologies, attitude of checkmating each other by strategies and counter-strategies gave rise to the Cold War.

Question 4.
Describe extreme differences among USA and USSR.
Answer:
(i) The U.S.A was a democratic State, advocating capitalism, while the Soviet Union advocated socialism and a one party authoritarian system.
(ii) Both the super powers wanted to expand their own dominance in the world.
(iii) America wanted to spread capitalism, while the Soviet Union wanted to spread socialism.

Question 5.
What is meant by Non-Aligned Movement and who were its founding fathers?
Answer:
(i) The Asian and African countries, which became independent after the Second World War supported the idea of non-alignment.

(ii) This movement started from 1961 under the leadership of India’s Prime Minister Pandit Jawaharlal Nehru, President of Yugoslavia Marshall Tito, President of Egypt Gamal Abdal Nasser, President of Indonesia Dr. Sukarno and Prime Minister of Ghana Dr. Kwame Nkrumah.

Question 6.
Evaluate the Non-Aligned Movement.
Answer:
(i) The Non-Aligned Movement has opposed colonialism, imperialism and racism.
(ii) It has encouraged the resolution of international disputes by peaceful means.
(iii) The Non-Aligned movement is based on eternal principles of humanism, global peace and equality.
(iv) It has inspired the less developed countries to come together.
(v) While taking a firm stand on disarmament, fostering human rights, the Non-Aligned movement put forth the problems of poor, undeveloped countries firmly.
(vi) This movement made a demand of a New International Economic Order (NIEO).

Balbharti Maharashtra State Board Class 9 History Solutions Chapter 10 Changing Life 2 Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 9 History Solutions Chapter 10 Changing Life 2

Class 9 History Chapter 10 Changing Life 2 Textbook Questions and Answers

1. Choose the proper option and rewrite the completed sentences:

Question 1.
India won the cricket world cup under the captainship of ______.
(a) Sunil Gavaskar
(b) Kapil Dev
(c) Sayyad Kirmani
(d) Sandip Patil
Answer:
(b) Kapil Dev

Question 2.
The _____ language is gaining importance in India due to the process of globalisation.
(a) Punjabi
(b) French
(c) English
(d) Hindi
Answer:
(c) English

2. Complete the information in the following table:

Question 1.

Answer:

3. Give reasons for the following statements:

Question 1.
Cricket began to be played all over India, to a greater or smaller extent.
Answer:
Cricket began to be played all over India, to a greater or smaller extent because:-

• In 1983, the Indian team won the World Cup for cricket, under the captainship of Kapil Dev. It was a historic victory.
• Cricket instantly won great popularity across the country.
• In the same year, Sunil Gavaskar broke the earlier record of maximum centuries in test cricket.
• In 1985, India won the ‘Benson and Hedges’ World Championship of cricket. As a result, cricket came to be played in all States to a lesser or greater extent, but at the cost of indigenous Indian games.

Question 2.
The economy of movies is changing.
Answer:
(i) Movies in foreign languages are now translated. Even during the screening of English movies, a short Hindi translation now appears on the screen as sub-titles.

(ii) Hindi movies now compete with ‘global’ movies as they have reached every nook and comer of the world. We see a reflection of politics, social events, industry and technology in the movies.

(iii) Movies which were 3-4 hours long are now of only one or one and a half hours. Moreover, the concept of one screen and one cinema hall has given way to multiplexes.

(iv) The days of a movie running for 100 weeks in one cinema hall are over. Now one movie runs in thousands of cinema halls in India and abroad simultaneously.

(v) This development has changed the economy of movies. Production of movies has attained the status of industry.

(vi) The industry now employs crores of people. The movie industry in regional languages is also thriving.
Therefore the economy of movies is changing.

4. Answer the following questions in 25-30 words:

Question 1.
Why is it necessary to keep alive the dialects of Indian languages?
Answer:
(i) Hindi, Assamese, Bengali, Gujarati, Kannad, Kashmiri, Malayalam, Marathi, Odiya, Punjabi, Sanskrit, Tamil, Telugu, Urdu, Konkani,
Manipuri, Nepali and Sindhi are the official languages in India.
(ii) These Indian languages also have dialects, but their number is now on the decline.
(iii) Timely steps should be taken to nurture them, otherwise we will lose an important part of our heritage.
(iv) Nevertheless, Hindi, which has reached everywhere through the medium of Hindi movies, has served to unite the country by language.

Question 2.
Elaborate upon the changing scope of newspapers.
Answer:
(i) During early post-independence period, the newspapers were expected to not only give the news of daily events, but also give impetus to industry and commerce by printing advertisements.

(ii) Earlier, newspapers were black and white. With the changing times, colour printing became common.

(iii) Earlier, newspapers were thought to be the mouthpieces of the taluka or district. Now they have to face tough competition from the State level newspaper chains. But on the whole, newspapers are now becoming more active.

(iv) Their scope has enlarged to include raising funds for drought affected and flood affected people, helping meritorious students from lower income groups to go for higher education and organizing or sponsoring cultural programmes. This is how newspapers have now become an inseparable part of our lives.

Question 3.
What changes have taken place in the medium of television?
Answer:
(i) Television came to India during the post-independence period. Earlier it was black and white. Now it is coloured. Earlier it was limited to some selected programmes and fixed time-slots.

(ii) Gradually its scope was enlarged to include educational programmes, news bulletins, detailed reporting of the tours of the President and the Prime Minister.

(iii) During the telelcast of Ramayana and Mahabharat, a majority of the people used to sit glued to the television set. These serials proved the popularity of this medium. Then in 1991, CNN channel showed to the entire world a live visual reporting of the Iraq war.

(iv) In 1998, STAR (Satellite Television Asia Region) a private media house entered India, and the uninteresting, monotonous and propagandist news telecasts of the early period underwent a sea change.

(v) The language, the technique of presentation, studios equipped with the latest technology and the use of OB (outdoor broadcasting) vans have expanded the scope of Indian T.V. channels still further, and brought in transparency and variety. Now, every nook and corner of the country is connected.

Class 9 History Chapter 10 Changing Life 2 Additional Important Questions and Answers

Choose the correct option from the given options and rewrite the statements:

Question 1.
_____ won the national championship of billiards for teenagers at the age of 15.
(a) Milkha Singh
(b) Rafael Nadal
(c) Geet Sethi
(d) Prakash Padukone
Answer:
(c) Geet Sethi

Question 2.
In________ STAR (Satellite Television Asia Region) a private media house entered India.
(a) 1995
(b) 1996
(c) 1997
(d) 1998
Answer:
(d) 1998

Question 3.
In 1991, _______ showed to the entire world a live visual reporting of the Iraq War.
(a) CNN
(b) CNBC
(c) HBO
(d) NDTV
Answer:
(a) CNN

Question 4.
The Kohima Radio station had to make its broadcast in __________ languages which included English, Hindi and Naga dialects.
(a) 28
(b) 26
(c) 24
(d) 25
Answer:
(d) 25

Identify and write the wrong pair in the following sets:

Question 1.
(1) Karnam Malleshwari – Weight lifting
(ii) Sunil Gavaskar – Ace Indian Cricketer
(iii) CNN – Iraq War
(iv) Star Television – Sponsoring cultural programmes
Answer:
Wrong Pair: Star Television – Sponsoring cultural programmes

Question 2.
(i) Kapil Dev -1983 World Cup
(ii) Geet Sethi – Benson and Hedges
(iii) Karnam Malleshwari – First woman to win a medal at Olympics
(iv) Sunil Gavaskar – Maximum centuries in test cricket
Answer:
Wrong Pair: Geet Sethi – Benson and Hedges

Question 3.
(i) India won Cricket World Cup – 1983
(ii) Karnam Malleshwari won a medal at Olympics – 2000 ’
(iii) Live telecast of Iraq War -1991
(iv) Star T.V. entered India -1992
Answer:
Wrong Pair: Star T.V. entered India -1992

Do as directed:

Question 1.
Complete the following concept:

Answer:

Explain the statements with reason.

Question 1.
Hindi Movies have reached every nook and corner of the world.
Answer:
(i) In the field of entertainment, the place of Hindi movies is incomparable.
(ii) Now movies reflect contemporary themes. Film shooting locales have moved abroad.
(iii) So, viewers can now see many different places in foreign countries. Movies in foreign languages are now translated.
(iv) During the screening of English movies, a short Hindi translation now appears on the screen as sub-titles.
(v) Hindi movies now compete with ‘global’ movies as they have reached every nook and corner of the world.

Read the following passage and answer the questions:

Sports: During the pre-independence period, only a few selected games were known to people in general. Some sports persons changed this situation. This enhanced the status of both – the sports, and the sportspersons. For example, Geet Sethi achieved , global excellence in snooker, a variation of billiards. He won the national championship of billiards for teenagers at the age of 15. Later, he went on to win national and international championships. At the , global level, he won the amateur billiards competition thrice, and the professional one five times. His success made the game popular, and newspapers began to report news about billiards. Thus he made a new field available to rising sportspersons in India, It was in 1983, that the Indian team won the World , Cup for cricket, under the captainship of Kapil Dev. It was a historic victory. Cricket instantly won great , popularity across the country. In the same year, ‘Sunil Gavaskar broke the earlier record of maximum centuries in test cricket. In 1985, India won the ‘Benson and Hedges’ World Championship of cricket. As a , result, cricket came to be played in all States to a lesser or greater extent, but at the cost of indigenous Indian games. A few movies were also produced around the , theme of cricket. Live telecasts of the full five days or , one day of the matches also became available.
India had been participating in Asiad and Olympic of year 2000, Karnam Malleshwari won a medal for, weight-lifting. She was the first Indian woman to win , a medal at the Olympics. India’s representation began to rise in various Olympic games such as hockey, badminton, tennis, swimming, weightlifting and archery.

Question 1.
Which two cricket tournaments mentioned in the passage records a victory for India?
Answer:
World Cup 1983 and Benson and Hedges -1985 are the two tournaments mentioned in the passage that recorded victory for India.

Question 2.
Who was the first Indian woman to win a medal at the Olympics? Which sport did she represent?
Answer:
Karnam Malleshwari was the first Indian Women to win a medal for India at Olympic. She represented India in Women’s Weight Lifting.

Question 3.
Why do you think cricket has overshadowed other indigenous Indian Games?
Answer:
Cricket was introduced in India by the British. In the post independence period this game was mostly played by the elite. In times to come, cricket gained glamour and popularity across the nation gradually giving a setback to other indigenous games in India. Since cricketers received more professional coaching, funding and infrastructural facilities as compared to players of other games, it became inevitable that other games in India were overshadowed.

Answer the following questions in detail:

Question 1.
Do you think English has threatened our indigenous languages? How?
Answer:
(i) Hindi, which has reached everywhere through the medium of Hindi movies, has served to unite the country by language.
(ii) However, English language has been gaining ground in India due to the process of globalisation which began after 1990.
(iii) English opens the doors to multiple job opportunities. Moreover, Indians are at the forefront in learning English.
(iv) However, it is necessary to ensure that this process does not endanger the very existence of regional languages.

Question 2.
Explain the contribution of Geet Sethi and Kamam Malleswari to the field of sports.
Answer:
(i) Geet Sethi:

• Geet Sethi achieved global excellence in snooker, a variation of billiards.
• He won the national championship of billiards for teenagers at the age of 15.
• Later, he went on to win national and international championships.
• At the global level, he won the amateur billiards competition thrice, and the professional one five times.
• His success made the game popular, and newspapers began to report news about billiards.

(ii) Karnam Malleswari: At the Olympics of the year 2000, Karnam Malleswari won a medal for weightlifting. She was the first Indian woman to win a medal at the Olympics.