MCQ Questions

Question No. 1

Use the molecular theory of matter to explain how a gas exerts pressure on the walls of its containing vessel.

Answer :

Question No. 2

Use the molecular theory of matter to explain why the pressure of a fixed mass of gas increases when the volume of the gas is decreased at constant temperature.

Answer :

Question No. 3

Give two examples of situations where the adhesive forces are stronger than the cohesive forces.

Answer :

Question No. 4

Explain why mercury does not display capillary action.

Answer :

Question No. 5

Some crystals of copper sulphate are dropped into a beaker of water.

Answer :

a) Use the molecular theory of matter to explain why the water becomes blue in colour after some time.

b) What is the name of the phenomenon which causes the change in colour?

c) What effect on the colour change will occur if the water was hot?

Question No. 6

The molecular theory of matter is based on: (i) the random motion of the molecules in a solid (ii) very weak forces of attraction between the molecules of gases (iii) small spaces between the molecules of a liquid. Which is/are true?

Answer :

(i), (ii), and (iii)

(i) and (ii) only

(ii) and (iii) only

(i) and (iii) only

Question No. 7

When you blow up a balloon:

Answer :

The volume of the balloon increases and the pressure inside the balloon decreases.

The pressure inside the balloon increases because the number of air molecules inside it increases.

The volume of the balloon increases but the pressure inside the balloon is always equal to atmospheric pressure.

The pressure inside the balloon remains constant because the temperature of the balloon remains constant.

Question No. 8

When the cohesive forces are smaller than the adhesive forces, a liquid will: (i) wet the surface on which it is dropped (ii) form a convex meniscus (iii) rise up a narrow capillary tube. Which is/are true?

Answer :

(i), (ii) and (iii)

(i) and (ii) only

(ii) and (iii) only

(i) and (iii) only

Question No. 9

The diagrams show three capillary tubes in liquids: pure water, soap solution, mercury. (i) (ii) (iii) The corresponding liquids are:

Answer :

(i)=water, (ii)=soap solution, (iii)=mercury

(i)=water, (ii)=mercury, (iii)=soap solution

(i)=mercury, (ii)=soap solution, (iii)=water

(i)=soap solution, (ii)=mercury, (iii)=water

Question No. 10

In which situation will the rate of diffusion be greatest?

Answer :

Ammonia and fumes of hydrochloric acid diffusing into each other.

Naphthalene diffusing into the atmosphere.

Crystals of potassium permanganate diffusing into water.

Metallic gold and metallic lead diffusing into each other.

Chapter

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