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Question (21)

QN00201

Which statement about water and soil is correct?

(A) Water heats and cools faster than soil
(B) Soil heats and cools faster than water
(C) Both heat equally fast
(D) Water cools faster but heats slowly

Correct Answer: B

Explanation:

Soil changes temperature faster than water.

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Question (22)

QN00202

Windows in many coastal houses face the sea because —

(A) sea water is beautiful
(B) sea breeze provides cooling
(C) sunlight enters directly
(D) sea breeze carries moisture only

Correct Answer: B

Explanation:

Sea breeze keeps houses cooler.

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Question (23)

QN00203

In the convection process inside a beaker, heated water at the bottom first becomes —

(A) colder
(B) denser
(C) lighter
(D) solid

Correct Answer: C

Explanation:

Heated water expands and becomes lighter.

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Question (24)

QN00204

Which of the following situations mainly involves convection?

(A) A metal rod becoming hot
(B) Sunlight reaching Earth
(C) Boiling water circulating in a pan
(D) Heat transfer through a wall

Correct Answer: C

Explanation:

Circulation of boiling water is convection.

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Question (25)

QN00205

Why does hot air balloon rise upward?

(A) Hot air becomes lighter
(B) Cold air rises faster
(C) Hot air becomes heavier
(D) Air stops moving

Correct Answer: A

Explanation:

Heated air inside the balloon is lighter.

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Question (26)

QN00206

Which process causes warm air above land to rise during daytime?

(A) Conduction
(B) Radiation
(C) Convection
(D) Reflection

Correct Answer: C

Explanation:

Warm air rises by convection.

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Question (27)

QN00207

A room heater placed near the floor warms the room effectively because —

(A) heat moves downward
(B) convection currents circulate warm air
(C) walls conduct heat quickly
(D) air becomes solid

Correct Answer: B

Explanation:

Warm air rises and circulates through the room.

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Question (28)

QN00208

The coloured water in the beaker comes down from the sides because it is —

(A) hotter and lighter
(B) cooler and heavier
(C) evaporated completely
(D) pushed by the flame

Correct Answer: B

Explanation:

Cooler water is denser and sinks.

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Question (29)

QN00209

Which observation proves that heated air expands?

(A) Iron nail rusting
(B) Balloon growing larger in sunlight
(C) Water freezing in winter
(D) Steam condensing on glass

Correct Answer: B

Explanation:

Air expands on heating.

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Question (30)

QN00210

During daytime at a beach, which surface is generally hotter?

(A) Sea water
(B) Sand on land
(C) Both equally hot
(D) Air only

Correct Answer: B

Explanation:

Land heats faster than water.

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Question (21)

Which statement about water and soil is correct?

Explanation:

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Question (22)

Windows in many coastal houses face the sea because —

Explanation:

Link:

Question (23)

In the convection process inside a beaker, heated water at the bottom first becomes —

Explanation:

Link:

Question (24)

Which of the following situations mainly involves convection?

Explanation:

Link:

Question (25)

Why does hot air balloon rise upward?

Explanation:

Link:

Question (26)

Which process causes warm air above land to rise during daytime?

Explanation:

Link:

Question (27)

A room heater placed near the floor warms the room effectively because —

Explanation:

Link:

Question (28)

The coloured water in the beaker comes down from the sides because it is —

Explanation:

Link:

Question (29)

Which observation proves that heated air expands?

Explanation:

Link:

Question (30)

During daytime at a beach, which surface is generally hotter?

Explanation:

Link:

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