10th class Physics, Chapter 11: Transfer of Thermal Energy MCQs

1. Which method of heat transfer requires direct contact between particles?

1. (A) Convection
2. (B) Radiation
3. (C) Conduction ✓
4. (D) Evaporation

2. What causes convection currents in liquids and gases?

1. (A) The continuous movement of particles in all directions
2. (B) The rising of warm regions and sinking of cooler regions ✓
3. (C) The conduction of heat through the medium
4. (D) The reflection of heat waves

3. The natural phenomenon caused by convection currents is:

1. (A) earthquakes
2. (B) land and sea breezes ✓
3. (C) magnetic fields
4. (D) solar eclipses

4. How does heat transfer occur through radiation?

1. (A) Through direct contact between objects
2. (B) Through the movement of heated fluid
3. (C) Through electromagnetic waves without needing a medium ✓
4. (D) Through the absorption of water molecules

5. The surface which absorbs and emits the most radiation is:

1. (A) smooth and shiny surfaces
2. (B) dark and rough surfaces ✓
3. (C) transparent and thin surfaces
4. (D) polished and white surfaces

6. What is the role of the greenhouse effect in Earth's temperature regulation?

1. (A) It allows all heat to escape into space
2. (B) It blocks heat from entering the atmosphere
3. (C) It traps heat to maintain a stable temperature ✓
4. (D) It causes immediate cooling of Earth's surface

7. The Sun's heat reaches the Earth:

1. (A) through conduction between air particles
2. (B) through convection in space
3. (C) through radiation via electromagnetic waves ✓
4. (D) through reflection by the moon

8. Heat flows from one object to another until:

1. (A) their masses become equal
2. (B) their volumes become equal
3. (C) one of them melts
4. (D) thermal equilibrium is reached ✓

9. Conduction of heat is most efficient in:

1. (A) a vacuum
2. (B) metals ✓
3. (C) liquids
4. (D) gases

10. Heat travels faster in metals than in non-metals because metals have:

1. (A) free electrons ✓
2. (B) more neutrons
3. (C) lower density always
4. (D) no atoms

11. Which of the following is the best conductor of heat?

1. (A) Diamond ✓
2. (B) Copper
3. (C) Silver
4. (D) Wood

12. Temperature tells us:

1. (A) how hot or cold an object is ✓
2. (B) the energy transferred to an object
3. (C) the mass of heat in an object
4. (D) the speed of heat flow

13. Convection occurs in:

1. (A) a vacuum
2. (B) metals only
3. (C) liquids and gases ✓
4. (D) solids only

14. Convection currents in air are caused by differences in air:

1. (A) density ✓
2. (B) colour
3. (C) electrical charge
4. (D) magnetism

15. At night, the breeze blows from:

1. (A) sea to land
2. (B) up to down
3. (C) sea to sky only
4. (D) land to sea ✓

16. During the day, the land becomes hotter than the sea because the land has a:

1. (A) higher specific heat capacity
2. (B) higher density of water
3. (C) larger volume
4. (D) lower specific heat capacity ✓

17. Rising currents of warm air used by gliders and birds are called:

1. (A) jet streams of water
2. (B) trade waves
3. (C) thermals ✓
4. (D) tides

18. Convection currents in the ocean help marine life by:

1. (A) carrying oxygen down and nutrients up ✓
2. (B) stopping all water movement
3. (C) removing salt from the sea
4. (D) heating the ocean floor

19. In a storage tank water heater, the hot water outlet is at the top because hot water:

1. (A) stops moving
2. (B) is less dense and rises ✓
3. (C) is denser and sinks
4. (D) is heavier than cold water

20. The part which keeps the water in a hot-water tank at a set temperature is the:

1. (A) cold water inlet
2. (B) hot water outlet
3. (C) pipe
4. (D) thermostat ✓