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Question (11)

QN004680

Water vapour itself is

(A) visible
(B) white in colour
(C) invisible
(D) blue in colour

Correct Answer: C

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Question (12)

QN004681

Which of the following is an example of evaporation?

(A) Formation of ice cubes
(B) Drying of wet clothes
(C) Melting of candle wax
(D) Formation of dew

Correct Answer: B

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Question (13)

QN004682

Which process is responsible for sweat disappearing from our body?

(A) Condensation
(B) Freezing
(C) Evaporation
(D) Melting

Correct Answer: C

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Question (14)

QN004683

A steel plate contains 15 mL of water. After some hours the water disappears and the plate remains dry underneath. The most reasonable conclusion is that the water

(A) entered the steel
(B) evaporated
(C) froze
(D) changed into dust

Correct Answer: B

Explanation:

Water cannot seep through steel; it changes into water vapour.

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Question (15)

QN004684

If puddles disappear faster on a sunny day than on a cloudy day, the best explanation is

(A) more freezing occurs
(B) more evaporation occurs
(C) more condensation occurs
(D) more absorption by air occurs

Correct Answer: B

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Question (16)

QN004685

A student leaves equal amounts of water on a steel plate and a plastic plate. Both dry after some time. This suggests that water can

(A) evaporate from different surfaces
(B) only disappear from steel
(C) only disappear from plastic
(D) become solid on all surfaces

Correct Answer: A

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Question (17)

QN004686

Which of the following observations would support Thirav’s idea?

(A) Water disappears from a steel plate without passing through it
(B) Water appears beneath the steel plate
(C) Water becomes ice
(D) Water changes colour

Correct Answer: A

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Question (18)

QN004687

If 40 mL of water is kept on a steel plate and no water is found underneath, the most likely fate of the water is

(A) absorption into steel
(B) evaporation into water vapour
(C) conversion into soil
(D) freezing

Correct Answer: B

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Question (19)

QN004688

Why was the water observed at regular intervals in Activity 8.2?

(A) To measure colour changes
(B) To investigate how water disappears over time
(C) To check freezing
(D) To compare different plates

Correct Answer: B

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Question (20)

QN004689

Which statement about evaporation at room temperature is correct?

(A) It does not occur
(B) It occurs continuously
(C) It occurs only in sunlight
(D) It occurs only at night

Correct Answer: B

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Question (11)

Water vapour itself is

Explanation:

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Question (12)

Which of the following is an example of evaporation?

Explanation:

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Question (13)

Which process is responsible for sweat disappearing from our body?

Explanation:

Link:

Question (14)

A steel plate contains 15 mL of water. After some hours the water disappears and the plate remains dry underneath. The most reasonable conclusion is that the water

Explanation:

Link:

Question (15)

If puddles disappear faster on a sunny day than on a cloudy day, the best explanation is

Explanation:

Link:

Question (16)

A student leaves equal amounts of water on a steel plate and a plastic plate. Both dry after some time. This suggests that water can

Explanation:

Link:

Question (17)

Which of the following observations would support Thirav’s idea?

Explanation:

Link:

Question (18)

If 40 mL of water is kept on a steel plate and no water is found underneath, the most likely fate of the water is

Explanation:

Link:

Question (19)

Why was the water observed at regular intervals in Activity 8.2?

Explanation:

Link:

Question (20)

Which statement about evaporation at room temperature is correct?

Explanation:

Link:

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