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Question (11)

QN004836

The pot-in-pot cooler works mainly because of:

(A) Magnetic force
(B) Evaporation of water from sand
(C) Boiling of water inside pot
(D) Condensation inside pot

Correct Answer: B

Explanation:

Cooling occurs due to evaporation from wet sand.

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Question (12)

QN004837

A student wants to cool a hot mobile cover quickly. What should be done?

(A) Keep it under sunlight
(B) Wipe with dry cloth only
(C) Wipe with wet cloth and allow evaporation
(D) Wrap in plastic

Correct Answer: C

Explanation:

Water evaporates from wet cloth and cools the surface.

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Question (13)

QN004838

Which arrangement will give maximum cooling effect?

(A) Water in closed bottle
(B) Water in steel glass
(C) Water spread on a plate
(D) Water in sealed container

Correct Answer: C

Explanation:

Larger surface area increases evaporation rate.

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Question (14)

QN004839

To improve cooling in a pot-in-pot system, which material is BEST to use around pots?

(A) Dry sand
(B) Plastic beads
(C) Dry cotton only
(D) Metal shavings

Correct Answer: A

Explanation:

Dry sand supports controlled evaporation.

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Question (15)

QN004840

Which action will reduce cooling effect in an earthen pot?

(A) Keeping pot in wind
(B) Keeping pot in shade
(C) Blocking pores with paint
(D) Adding water regularly

Correct Answer: C

Explanation:

Blocking pores prevents evaporation.

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Question (16)

QN004841

If evaporation is faster, cooling effect will be:

(A) Less
(B) No change
(C) Greater
(D) Zero

Correct Answer: C

Explanation:

Faster evaporation increases cooling.

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Question (17)

QN004842

A wet floor dries faster on a windy day because:

(A) Wind reduces temperature
(B) Wind increases evaporation rate
(C) Wind freezes water
(D) Wind stops evaporation

Correct Answer: B

Explanation:

Wind carries away vapour, increasing evaporation.

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Question (18)

QN004843

Two identical wet cloths are kept, one in sun and one in shade. The cloth in sun dries faster because:

(A) Less air movement
(B) Higher evaporation rate due to heat
(C) More humidity
(D) Less sunlight energy

Correct Answer: B

Explanation:

Higher temperature increases evaporation.

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Question (19)

QN004844

A student observes 50 ml water in plate and 50 ml in bottle cap. Which evaporates faster?

(A) Bottle cap
(B) Plate
(C) Both same
(D) None evaporates

Correct Answer: B

Explanation:

Plate has larger surface area.

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Question (20)

QN004845

Reason for faster cooling in a wet hand compared to dry hand is:

(A) Dry hand absorbs heat
(B) Water on wet hand evaporates absorbing heat
(C) Dry hand produces heat
(D) Wet hand freezes

Correct Answer: B

Explanation:

Evaporation absorbs heat from skin.

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Question (11)

The pot-in-pot cooler works mainly because of:

Explanation:

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Question (12)

A student wants to cool a hot mobile cover quickly. What should be done?

Explanation:

Link:

Question (13)

Which arrangement will give maximum cooling effect?

Explanation:

Link:

Question (14)

To improve cooling in a pot-in-pot system, which material is BEST to use around pots?

Explanation:

Link:

Question (15)

Which action will reduce cooling effect in an earthen pot?

Explanation:

Link:

Question (16)

If evaporation is faster, cooling effect will be:

Explanation:

Link:

Question (17)

A wet floor dries faster on a windy day because:

Explanation:

Link:

Question (18)

Two identical wet cloths are kept, one in sun and one in shade. The cloth in sun dries faster because:

Explanation:

Link:

Question (19)

A student observes 50 ml water in plate and 50 ml in bottle cap. Which evaporates faster?

Explanation:

Link:

Question (20)

Reason for faster cooling in a wet hand compared to dry hand is:

Explanation:

Link:

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