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Question (1)

QN004826

What is the main reason water in an earthen pot feels cooler than water in a steel pot?

(A) Steel absorbs heat faster
(B) Water evaporates through tiny pores of earthen pot causing cooling
(C) Earthen pot produces cold energy
(D) Steel reacts with water

Correct Answer: B

Explanation:

Water evaporates through pores of earthen pot and causes cooling due to loss of heat.

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Question (2)

QN004827

Which everyday activity best demonstrates cooling due to evaporation?

(A) Burning paper
(B) Sprinkling water on a roof in summer
(C) Mixing salt in water
(D) Freezing ice in a fridge

Correct Answer: B

Explanation:

Sprinkled water evaporates and cools the surface.

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Question (3)

QN004828

When sanitiser is rubbed on hands, the cooling sensation is mainly due to:

(A) Freezing of sanitiser
(B) Melting of sanitiser
(C) Rapid evaporation of liquid
(D) Condensation on skin

Correct Answer: C

Explanation:

Sanitiser evaporates quickly and absorbs heat from skin.

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Question (4)

QN004829

In a pot-in-pot cooler, the cooling effect is mainly due to evaporation from:

(A) Inner pot surface
(B) Sand layer surrounding the pots
(C) Lid surface
(D) Water inside food containers

Correct Answer: B

Explanation:

Water in sand evaporates and produces cooling.

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Question (5)

QN004830

Which of the following is NOT an example of cooling effect by evaporation?

(A) Drying of wet clothes
(B) Cooling of water in earthen pot
(C) Boiling of water in a kettle
(D) Sweating of human body

Correct Answer: C

Explanation:

Boiling involves heating, not evaporative cooling effect.

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Question (6)

QN004831

Why is water in an earthen pot cooler during summer?

(A) Water inside freezes slightly
(B) Heat is absorbed from surrounding air during evaporation
(C) Water becomes heavier
(D) Steel pots heat water more

Correct Answer: B

Explanation:

Evaporation absorbs heat from surroundings, cooling water.

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Question (7)

QN004832

Which material is used in the gap of a pot-in-pot cooler to enhance cooling?

(A) Plastic
(B) Sand
(C) Glass pieces
(D) Rubber

Correct Answer: B

Explanation:

Sand holds water and supports evaporation.

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Question (8)

QN004833

Cooling effect due to evaporation can be defined as:

(A) Heating of water during evaporation
(B) Cooling caused when a liquid changes into vapour
(C) Freezing of water into ice
(D) Condensation of water vapour

Correct Answer: B

Explanation:

Liquid changes to vapour and absorbs heat causing cooling.

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Question (9)

QN004834

Evaporation is the process in which:

(A) Gas becomes liquid
(B) Liquid becomes solid
(C) Liquid changes into vapour
(D) Solid changes into liquid

Correct Answer: C

Explanation:

Liquid changes into vapour.

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Question (10)

QN004835

Which statement best describes cooling effect?

(A) Heat is released during evaporation
(B) Heat is absorbed during evaporation causing cooling
(C) Water becomes heavier after evaporation
(D) Air becomes liquid

Correct Answer: B

Explanation:

Evaporation absorbs heat from surroundings.

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Question (1)

What is the main reason water in an earthen pot feels cooler than water in a steel pot?

Explanation:

Link:

Question (2)

Which everyday activity best demonstrates cooling due to evaporation?

Explanation:

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Question (3)

When sanitiser is rubbed on hands, the cooling sensation is mainly due to:

Explanation:

Link:

Question (4)

In a pot-in-pot cooler, the cooling effect is mainly due to evaporation from:

Explanation:

Link:

Question (5)

Which of the following is NOT an example of cooling effect by evaporation?

Explanation:

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Question (6)

Why is water in an earthen pot cooler during summer?

Explanation:

Link:

Question (7)

Which material is used in the gap of a pot-in-pot cooler to enhance cooling?

Explanation:

Link:

Question (8)

Cooling effect due to evaporation can be defined as:

Explanation:

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Question (9)

Evaporation is the process in which:

Explanation:

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Question (10)

Which statement best describes cooling effect?

Explanation:

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