Grade 10 - Chapter 10: Heat and modes of Transfer Solved MCQs

Chapter 10: Heat and Modes of Transfer

Solved MCQs with Explanations

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1. Why is water used as a radiator in automobiles?

A. It is easily available

B. It has large specific heat ✅

C. It is low cost / free

D. It has oxygen

Explanation: Water’s large specific heat means it can absorb more heat without a significant temperature increase, making it ideal for cooling engines.

2. Which of the following situations is the best example of conduction?

A. Metal pan becomes hot when placed in boiling water ✅

B. Microwave oven heating food

C. Sunlight warming the surface of the Earth

D. Warm air rising becomes hot

Explanation: Conduction occurs when heat is transferred through direct contact, such as a metal pan getting hot in boiling water.

3. Which combination of heat transfer methods would be dominant when you place your hands near, but not touching, a fire?

A. Conduction and radiation

B. Radiation and convection ✅

C. Convection and conduction

D. Conduction and insulation

Explanation: Radiation transfers heat through electromagnetic waves and convection carries heat through moving air.

4. What is symbol and what is unit for the heat capacity of an object?

A. J°C⁻¹

B. J·kg·K⁻¹

C. J·K⁻¹ ✅

D. J·kg⁻¹·K⁻¹

Explanation: Heat capacity is the amount of heat required to change an object’s temperature per degree; its SI unit is Joules per Kelvin (J·K⁻¹).

5. If the same amount of heat energy is supplied to equal masses of water and copper, why does the temperature of copper increase faster?

A. Copper has lower specific heat capacity ✅

B. Water is a poor conductor of heat

C. Convection in water dissipates heat energy quickly

D. Radiation from water is stronger

Explanation: Copper heats up faster because it has a lower specific heat capacity, meaning it requires less heat to raise its temperature.

6. The transfer of heat that takes place because of density difference in fluids is:

A. Conduction

B. Radiation

C. Convection ✅

D. Conduction and insulation

Explanation: Convection occurs in fluids when warmer, less dense areas rise and cooler, denser areas sink, transferring heat.

7. Why does Earth experience a warmer climate than the Moon, despite being nearly the same distance from the Sun?

A. Earth is better conductor than the Moon

B. The Moon reflects most of the Sun’s radiation

C. The Earth has greenhouse gases ✅

D. Moon traps heat effectively

Explanation: Greenhouse gases in Earth's atmosphere trap heat and maintain temperature, unlike the Moon which lacks such an atmosphere.

8. Dull black colour on a surface is the best absorber of radiation, which of the following is the best radiator?

A. Dull black surface ✅

B. Shining silver surface

C. Red coloured surface

D. White surface

Explanation: A dull black surface is both a good absorber and a good radiator of heat, according to radiation principles.

9. How does the enhanced greenhouse effect contribute to global warming?

A. It increases Earth’s ability to reflect solar radiation

B. It traps more heat in the Earth’s atmosphere ✅

C. It blocks ultraviolet rays from entering the atmosphere

D. It increases Earth’s rotation speed

Explanation: Greenhouse gases like CO₂ trap more infrared radiation in the atmosphere, increasing global temperatures.

10. What is the primary driving force behind the movement of tectonic plates?

A. Gravitational pull of the Moon

B. Solar radiation

C. Mantle convection currents ✅

D. Magnetic field of the Earth

Explanation: Heat within Earth causes mantle convection currents, which drive tectonic plate movement.

11. Which layer of the Earth is composed of partially molten rock that can flow slowly?

A. Lithosphere

B. Asthenosphere ✅

C. Mesosphere

D. Outer core

Explanation: The asthenosphere is the soft, partially molten layer below the lithosphere allowing plate motion.

12. Which of the following extreme weather events is most directly associated with rising sea levels?

A. Tornadoes

B. Wildfires

C. Hurricanes ✅

D. Earthquakes

Explanation: Rising sea levels lead to more severe storm surges and flooding during hurricanes, especially in coastal areas.

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