Practice MCQs For Thermal Physics

This quiz contains practice questions for GCE ‘O’ level topic: Thermal Physics. There are explanations for some of the questions after you submit the quiz. If you could not figure out why a particular option is the answer, feel free to drop a comment below or ask a question in ‘O’ & ‘A’ Level Discussion section of the forum. If you wish to contribute questions to this quiz, please contact us.

The quiz comprises of 10 questions, which are randomly selected from a large pool of questions. After completion, you can refresh the page and try the quiz again for a new set of 10 questions.

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1. Which of the following statements is true in relation to the transfer of energy?

During heating and cooling, energy always flows from a body of low temperature to a body of high temperature.

During heating and cooling, energy always flows from a body with more energy to a body with less energy.

During heating and cooling, energy always flows from a body of high temperature to a body of low temperature.

During heating and cooling, temperature always flows from a body with high temperature to a body with low temperature.

2. What will not affect the rate of evaporation from the surface of a liquid?

Draughts above the surface of the liquid

Surface area of the liquid

Temperature of the liquid

Depth of the liquid

3. A substance that flows under the action of an external pressure may be:

a gas or a solid, but not a liquid.

a liquid or a solid, but not a gas.

a gas or a liquid, but not a solid.

a gas, but not a liquid or solid.

4. A swimmer climbs out of a swimming pool on a warm, dry day. Almost immediately he begins to feel cold.

Why is this?

The water prevents infra-red radiation from reaching the body.

The water on his skin is a good conductor of heat.

The water allows a convection current to remove heat from his skin.

The water takes latent heat from his body in order to evaporate.

5. A fixed mass of gas in a syringe at $0^{\circ}\text{C}$ is heated at constant pressure.

Which graph shows the variation of volume V with temperature T, measured in $^{\circ}\text{C}$?

D

C

A

B

6. A substance consists of particles that are close together and moving past each other at random. The average speed of the particles is gradually increasing.

What best describes the substance?

a liquid being heated

a solid being heated

a solid being melted to form a liquid

a liquid being boiled to form a gas

7. The diagram shows a cross-section through a rain-water puddle formed in a shallow hole in a road surface.

Over a period of time, air temperature, wind speed and win direction remains constant.

What happens to the rate of evaporation of water from the puddle?

It remains constant.

It decreases, because the surface area decreases.

It increases, because the surface area decreases.

It increases, because the puddle gets shallower.

8. In a Brownian motion experiment involving smoke particles in air, heavy smoke particles settle quickly but very small smoke particles remain suspended for long periods of time.

Which statement explains why the small smoke particles do not settle?

Air pressure has a greater effect on smaller particles.

The small smoke particles have the same density as the air.

Random molecular bombardments by air molecules keep the particles suspended.

The Earth's gravitational field does not act on very small particles.

9. A liquid evaporates rapidly. Why does it cool?

Some of the most energetic molecules leave the liquid.

Fewer molecules are left in the liquid.

Energy is lost by convection currents.

Air molecules remove heat by contact with the liquid surface.

10. Which of the following DOES NOT result in faster speed of response of a thermometer?

Using a smaller bulb.

Using mercury instead of alcohol.

Using a bore with a larger diameter.

Using a bulb with a thinner glass.

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