PHYSICS FORM 1

ONLINE TESTS SERIES

MATTER, THERMAL EXPANSION AND HEATING

1. Evaporation occurs when molecules escape from a liquid surface into the air above it. During this process the temperature of the liquid falls.

Why does the temperature of the liquid fall?

2. A thermometer bulb is covered by a piece of damp absorbent cloth

Air at room temperature is blown across the damp cloth.

What happens to the thermometer reading?

3. Some air is trapped inside a small balloon. The average kinetic energy of the air molecules in the balloon is increased. What remains the same?

4. When ice melts to become water, which force must be overcome

5. To mark the lower fixed point of a Celsius scale on a thermometer, the thermometer should be placed in

6. At regular intervals along a railway line there is a gap between the rail sections.

What is the reason for the gap between the rail sections?

7. The diagram shows a liquid-in-glass thermometer

At 0 °C, the length of the liquid column is 2.0 cm. At 100 °C, the length of the liquid column is 22.0 cm. What is the length of the liquid column at 40 °C?

8. The diagram shows a liquid-in-glass thermometer

At 0 0C, the length of the liquid column is 2.0 cm. At 100 0C, the length of the liquid column is 22.0 cm. What is the length of the liquid column at 40 0C?

9. To mark the lower fixed point of a Celsius scale on a thermometer, the thermometer should be placed in

10. A glass beaker contains water. When the centre of the base of the beaker is heated, a convection current is set up.

Which statement explains this?

11. Two identical copper cans are filled with boiling water.

One can is insulated with wool. The temperature of the water in each can is taken every minute for several minutes. Graphs of the results are plotted.

Which graph shows the results obtained?

12. The diagram shows a cooling unit in a refrigerator

Why is the cooling unit placed at the top?

13. The diagram shows an electric heater being used to heat a beaker of water and an identical beaker of oil for several minutes

The temperature of the water and the temperature of the oil increase constantly.The rise in temperature of the oil is much greater than that of the water.Why is this?

14. The diagram shows the cross-section of a vacuum flask containing a hot liquid in a cold room. X and Y are points on the inside surfaces of the walls of the flask.

How is thermal energy transferred between X and Y?

15. In a vacuum flask, which methods of heat transfer are prevented by the vacuum?

16. In a vacuum flask, which methods of heat transfer are prevented by the vacuum?

 17 What does the Kinetic Theory of Gases describe?

 18 What does the kinetic energy of the particles in a system depend on?

19. As a substance changes state from a liquid to a gas, the amount of energy the particles have …

 20 The particles in the system are always in what kind of motion?

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