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Question (21)

QN004846

If air movement increases, evaporation rate will:

(A) Decrease
(B) Increase
(C) Stop
(D) Become zero always

Correct Answer: B

Explanation:

Wind speeds up evaporation.

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Question (22)

QN004847

In humid weather, evaporation becomes slower because:

(A) Air has less water vapour
(B) Air already contains more water vapour
(C) Temperature is always low
(D) Wind is absent always

Correct Answer: B

Explanation:

Air is already saturated with moisture.

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Question (23)

QN004848

A wet cloth takes longer to dry in rainy season because:

(A) High humidity slows evaporation
(B) High temperature stops drying
(C) Cloth absorbs rainwater only
(D) Sunlight is stronger

Correct Answer: A

Explanation:

High humidity reduces evaporation rate.

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Question (24)

QN004849

Two equal amounts of water are placed: one in sunlight and one in shade. The difference in evaporation is due to:

(A) Shape of container only
(B) Temperature difference
(C) Colour of water
(D) Salt content

Correct Answer: B

Explanation:

Higher temperature increases evaporation.

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Question (25)

QN004850

A student observes cooling is maximum when water is spread thinly. Reason is:

(A) Less surface area
(B) More surface area increases evaporation
(C) Water becomes solid
(D) Air stops movement

Correct Answer: B

Explanation:

Larger surface area increases evaporation.

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Question (26)

QN004851

Which condition will speed up cooling of wet floor most?

(A) No air movement
(B) Closed room
(C) Windy condition
(D) Cold container only

Correct Answer: C

Explanation:

Wind increases evaporation rate.

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Question (27)

QN004852

A wet earthen pot cools water faster than a sealed plastic bottle because:

(A) Plastic allows evaporation
(B) Earthen pot allows evaporation through pores
(C) Plastic absorbs water
(D) Bottle freezes water

Correct Answer: B

Explanation:

Porous pot allows evaporation.

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Question (28)

QN004853

If sand in pot-in-pot cooler is kept dry, cooling effect will:

(A) Increase
(B) Decrease
(C) Remain same
(D) Become zero instantly

Correct Answer: B

Explanation:

Less water reduces evaporation.

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Question (29)

QN004854

Which scenario shows strongest cooling effect?

(A) Wet cloth in closed room
(B) Wet cloth in windy sunlight
(C) Wet cloth in humid closed room
(D) Dry cloth in shade

Correct Answer: B

Explanation:

High temperature and wind increase evaporation.

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Question (30)

QN004855

When sweat evaporates from our body, we feel cool because:

(A) Heat is released
(B) Heat is absorbed from body
(C) Sweat becomes solid
(D) Air becomes cold

Correct Answer: B

Explanation:

Evaporation absorbs body heat.

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Question (21)

If air movement increases, evaporation rate will:

Explanation:

Link:

Question (22)

In humid weather, evaporation becomes slower because:

Explanation:

Link:

Question (23)

A wet cloth takes longer to dry in rainy season because:

Explanation:

Link:

Question (24)

Two equal amounts of water are placed: one in sunlight and one in shade. The difference in evaporation is due to:

Explanation:

Link:

Question (25)

A student observes cooling is maximum when water is spread thinly. Reason is:

Explanation:

Link:

Question (26)

Which condition will speed up cooling of wet floor most?

Explanation:

Link:

Question (27)

A wet earthen pot cools water faster than a sealed plastic bottle because:

Explanation:

Link:

Question (28)

If sand in pot-in-pot cooler is kept dry, cooling effect will:

Explanation:

Link:

Question (29)

Which scenario shows strongest cooling effect?

Explanation:

Link:

Question (30)

When sweat evaporates from our body, we feel cool because:

Explanation:

Link:

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