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Question (31)

QN00341

A silver-coloured water bottle remains cooler in sunlight because silver colour —

(A) absorbs more heat
(B) reflects most radiation
(C) increases evaporation
(D) traps warm air

Correct Answer: B

Explanation:

Silver surfaces reflect radiant heat.

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Question (32)

QN00342

Which of the following is the best example of heat loss by radiation?

(A) A metal spoon becoming hot in soup
(B) Water circulating during boiling
(C) A hot cup cooling on a table
(D) Steam rising upward

Correct Answer: C

Explanation:

Hot objects radiate heat to surroundings.

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Question (33)

QN00343

During winter, which curtain colour would help keep a room warmer in sunlight?

(A) White
(B) Cream
(C) Black
(D) Silver

Correct Answer: C

Explanation:

Black absorbs more heat radiation.

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Question (34)

QN00344

Which statement is true for all objects?

(A) Only hot objects radiate heat
(B) Only black objects radiate heat
(C) All objects exchange heat through radiation
(D) Radiation occurs only in sunlight

Correct Answer: C

Explanation:

All objects emit and absorb radiation.

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Question (35)

QN00345

Why are desert tents often light coloured from outside?

(A) To absorb heat quickly
(B) To reflect heat radiation
(C) To conduct heat faster
(D) To increase convection

Correct Answer: B

Explanation:

Light colours reflect most heat.

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Question (36)

QN00346

Which of the following combinations is correctly matched?

(A) Radiation — requires medium
(B) Radiation — transfer by waves
(C) Radiation — occurs only in liquids
(D) Radiation — transfer by particle movement

Correct Answer: B

Explanation:

Radiation transfers energy in wave form.

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Question (37)

QN00347

A shiny metal surface is often used in thermos flasks because it —

(A) absorbs more heat
(B) reflects radiant heat
(C) increases convection
(D) melts quickly

Correct Answer: B

Explanation:

Shiny surfaces reflect heat radiation.

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Question (38)

QN00348

Which object will heat up fastest in sunlight?

(A) White polished plate
(B) Silver foil
(C) Black iron sheet
(D) Transparent glass sheet

Correct Answer: C

Explanation:

Black surfaces absorb maximum heat.

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Question (39)

QN00349

The Sun’s heat reaches mountain regions and plains through —

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

Correct Answer: C

Explanation:

Solar heat reaches Earth through radiation.

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Question (40)

QN00350

Which condition is essential for radiation to occur?

(A) Presence of liquid particles
(B) Presence of air
(C) Presence of vacuum only
(D) No material medium is necessary

Correct Answer: D

Explanation:

Radiation does not require any medium.

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Question (31)

A silver-coloured water bottle remains cooler in sunlight because silver colour —

Explanation:

Link:

Question (32)

Which of the following is the best example of heat loss by radiation?

Explanation:

Link:

Question (33)

During winter, which curtain colour would help keep a room warmer in sunlight?

Explanation:

Link:

Question (34)

Which statement is true for all objects?

Explanation:

Link:

Question (35)

Why are desert tents often light coloured from outside?

Explanation:

Link:

Question (36)

Which of the following combinations is correctly matched?

Explanation:

Link:

Question (37)

A shiny metal surface is often used in thermos flasks because it —

Explanation:

Link:

Question (38)

Which object will heat up fastest in sunlight?

Explanation:

Link:

Question (39)

The Sun’s heat reaches mountain regions and plains through —

Explanation:

Link:

Question (40)

Which condition is essential for radiation to occur?

Explanation:

Link:

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