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Question (11)

QN0031358

A family stores drinking water in two containers—an earthen pot (matka) and a stainless steel pot. After a few hours, the water in the earthen pot is cooler. What is the correct explanation?

(A) Clay produces cold water naturally.
(B) Water seeps through tiny pores of the earthen pot and evaporates, causing cooling.
(C) The earthen pot absorbs heat permanently.
(D) Stainless steel converts water into steam.

Correct Answer: B

Explanation:

Water seeping through the tiny pores of the earthen pot evaporates and removes heat, producing a cooling effect.

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Question (12)

QN0031359

A student wants to make water evaporate as slowly as possible. Which set of conditions should be chosen?

(A) Large exposed area, hot day, strong wind
(B) Small exposed area, cool place, still air
(C) Large exposed area, fan, sunlight
(D) Small exposed area, sunlight, strong wind

Correct Answer: B

Explanation:

Evaporation is slow when the exposed area is small, the temperature is low and the air is still.

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Question (13)

QN0031360

Which sequence correctly represents the formation of rain?

(A) Evaporation → Condensation → Cloud formation → Rain
(B) Freezing → Melting → Rain
(C) Condensation → Evaporation → Rain
(D) Melting → Evaporation → Snow

Correct Answer: A

Explanation:

Water first evaporates, then condenses into clouds and finally falls as rain.

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Question (14)

QN0031361

A teacher performs an activity using two identical bottle caps containing equal amounts of water. One is kept in sunlight and the other in shade. Which observation is expected?

(A) Water in the shade evaporates faster.
(B) Water in sunlight evaporates faster due to higher temperature.
(C) Both evaporate at the same rate.
(D) Water in sunlight freezes first.

Correct Answer: B

Explanation:

Higher temperature in sunlight increases the rate of evaporation.

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Question (15)

QN0031362

Which of the following is NOT an example of condensation?

(A) Dew drops on grass in the morning
(B) Water droplets on the outside of a cold glass
(C) Water droplets on the lid while boiling water
(D) Wet clothes becoming dry in sunlight

Correct Answer: D

Explanation:

Drying of clothes is due to evaporation, not condensation.

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Question (16)

QN0031363

A student observes the following: P. Ice retains its shape when transferred to another container. Q. Water takes the shape of its container. R. Water vapour spreads throughout the available space. Which conclusion is correct?

(A) Only P is correct.
(B) P and Q are correct.
(C) Q and R are correct.
(D) P, Q and R are all correct.

Correct Answer: D

Explanation:

Ice has a fixed shape, water takes the shape of its container and water vapour spreads to fill available space.

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Question (17)

QN0031364

During a science activity, a plastic bottle containing water is squeezed repeatedly. Clouds become visible only after a small burnt piece of newspaper is added. Why?

(A) The burnt paper increases the water level.
(B) Dust particles from the burnt paper provide surfaces for water vapour to condense.
(C) The paper changes water into ice.
(D) Smoke itself is the cloud.

Correct Answer: B

Explanation:

Tiny dust particles act as centres for condensation, leading to cloud formation.

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Question (18)

QN0031365

Which situation will result in the fastest drying of washed clothes?

(A) A humid rainy day without wind
(B) A cool room with closed windows
(C) A hot, sunny and windy day
(D) A shaded place with still air

Correct Answer: C

Explanation:

High temperature, moving air and lower humidity increase the rate of evaporation.

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Question (19)

QN0031366

Which statement about the water cycle is correct?

(A) Water is permanently lost after evaporation.
(B) Water continuously changes state and circulates between the Earth's surface and the atmosphere.
(C) Clouds are formed only from sea water.
(D) Rainwater never reaches rivers or oceans.

Correct Answer: B

Explanation:

The water cycle is the continuous circulation of water through evaporation, condensation and precipitation.

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Question (20)

QN0031367

A student wants to verify that water droplets on the outside of a cold glass are formed due to condensation and not because water leaks through the glass. Which observation provides the strongest evidence?

(A) The glass feels cold to touch.
(B) The amount of water inside the glass remains unchanged while droplets continue to collect outside.
(C) Ice cubes slowly melt.
(D) The outside surface becomes wet after some time.

Correct Answer: B

Explanation:

Since the water level inside the glass does not decrease, the droplets are formed by condensation of water vapour from the surrounding air.

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Question (11)

A family stores drinking water in two containers—an earthen pot (matka) and a stainless steel pot. After a few hours, the water in the earthen pot is cooler. What is the correct explanation?

Explanation:

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Question (12)

A student wants to make water evaporate as slowly as possible. Which set of conditions should be chosen?

Explanation:

Link:

Question (13)

Which sequence correctly represents the formation of rain?

Explanation:

Link:

Question (14)

A teacher performs an activity using two identical bottle caps containing equal amounts of water. One is kept in sunlight and the other in shade. Which observation is expected?

Explanation:

Link:

Question (15)

Which of the following is NOT an example of condensation?

Explanation:

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Question (16)

A student observes the following: P. Ice retains its shape when transferred to another container. Q. Water takes the shape of its container. R. Water vapour spreads throughout the available space. Which conclusion is correct?

Explanation:

Link:

Question (17)

During a science activity, a plastic bottle containing water is squeezed repeatedly. Clouds become visible only after a small burnt piece of newspaper is added. Why?

Explanation:

Link:

Question (18)

Which situation will result in the fastest drying of washed clothes?

Explanation:

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Question (19)

Which statement about the water cycle is correct?

Explanation:

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Question (20)

A student wants to verify that water droplets on the outside of a cold glass are formed due to condensation and not because water leaks through the glass. Which observation provides the strongest evidence?

Explanation:

Link:

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