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Question (11)

QN00321

Radiation can transfer heat through —

(A) solids only
(B) liquids only
(C) gases only
(D) vacuum

Correct Answer: D

Explanation:

Radiation can travel through empty space.

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Question (12)

QN00322

Which of the following materials absorbs heat radiation the most?

(A) Polished aluminium
(B) White paper
(C) Black cloth
(D) Mirror

Correct Answer: C

Explanation:

Black surfaces absorb maximum radiation.

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Question (13)

QN00323

The warmth felt around a burning candle is mainly due to —

(A) radiation
(B) evaporation
(C) condensation
(D) freezing

Correct Answer: A

Explanation:

Heat from the flame spreads by radiation.

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Question (14)

QN00324

Which statement about radiation is correct?

(A) It requires moving particles
(B) It requires a material medium
(C) It can occur through empty space
(D) It occurs only in liquids

Correct Answer: C

Explanation:

Radiation can travel without a medium.

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Question (15)

QN00325

A black car becomes hotter in sunlight than a white car because black colour —

(A) reflects more heat
(B) absorbs more heat
(C) stops radiation
(D) produces radiation

Correct Answer: B

Explanation:

Black surfaces absorb more radiant heat.

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Question (16)

QN00326

Which object mainly transfers heat by radiation?

(A) Sun
(B) Iron rod
(C) Boiling water
(D) Wooden plank

Correct Answer: A

Explanation:

The Sun transfers heat through radiation.

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Question (17)

QN00327

Why are white roofs used in hot regions?

(A) They absorb more heat
(B) They reflect most heat radiation
(C) They produce cool air
(D) They conduct heat rapidly

Correct Answer: B

Explanation:

White surfaces reflect most radiation.

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Question (18)

QN00328

A student stands near a heater and feels warm without touching it. This demonstrates —

(A) convection
(B) conduction
(C) radiation
(D) evaporation

Correct Answer: C

Explanation:

Heat reaches the body by radiation.

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Question (19)

QN00329

Which of the following surfaces is the best absorber of heat radiation?

(A) Smooth white surface
(B) Shiny silver surface
(C) Dull black surface
(D) Transparent glass surface

Correct Answer: C

Explanation:

Dull black surfaces absorb maximum heat.

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Question (20)

QN00330

Heat transfer by radiation travels in the form of —

(A) particles
(B) waves
(C) liquids
(D) gases

Correct Answer: B

Explanation:

Radiation travels as waves.

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Question (11)

Radiation can transfer heat through —

Explanation:

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Question (12)

Which of the following materials absorbs heat radiation the most?

Explanation:

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Question (13)

The warmth felt around a burning candle is mainly due to —

Explanation:

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Question (14)

Which statement about radiation is correct?

Explanation:

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Question (15)

A black car becomes hotter in sunlight than a white car because black colour —

Explanation:

Link:

Question (16)

Which object mainly transfers heat by radiation?

Explanation:

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Question (17)

Why are white roofs used in hot regions?

Explanation:

Link:

Question (18)

A student stands near a heater and feels warm without touching it. This demonstrates —

Explanation:

Link:

Question (19)

Which of the following surfaces is the best absorber of heat radiation?

Explanation:

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Question (20)

Heat transfer by radiation travels in the form of —

Explanation:

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