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Question (21)

QN004690

Which pair shows examples of evaporation?

(A) Wet clothes drying and sweat drying
(B) Ice melting and water freezing
(C) Dew formation and rain
(D) Steam condensing and ice melting

Correct Answer: A

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Question (22)

QN004691

A spoonful of water disappears from a steel plate kept indoors. What is the most scientific explanation?

(A) The plate absorbed it
(B) It leaked through the plate
(C) It changed into water vapour
(D) It changed into oxygen

Correct Answer: C

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Question (23)

QN004692

Which investigation best tests whether water seeps through a steel plate?

(A) Heating the plate strongly
(B) Looking for water on the underside of the plate
(C) Freezing the plate
(D) Measuring the colour of water

Correct Answer: B

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Question (24)

QN004693

If water disappeared because of seeping through steel, what should be observed?

(A) Water below the plate
(B) Steam above the plate
(C) Ice on the plate
(D) A lighter plate

Correct Answer: A

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Question (25)

QN004694

A puddle contains 500 mL water in the morning and 300 mL in the evening. Assuming no seepage, how much water evaporated?

(A) 100 mL
(B) 150 mL
(C) 200 mL
(D) 300 mL

Correct Answer: C

Explanation:

500 − 300 = 200 mL

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Question (26)

QN004695

A steel plate has 25 mL water. After evaporation, 0 mL remains. What percentage of water evaporated?

(A) 25%
(B) 50%
(C) 75%
(D) 100%

Correct Answer: D

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Question (27)

QN004696

A student observes 60 mL water reducing to 45 mL after some time due to evaporation. How much water disappeared?

(A) 10 mL
(B) 15 mL
(C) 20 mL
(D) 25 mL

Correct Answer: B

Explanation:

60 − 45 = 15 mL

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Question (28)

QN004697

If a puddle loses 30 mL of water every hour by evaporation, how much water disappears in 4 hours?

(A) 60 mL
(B) 90 mL
(C) 120 mL
(D) 150 mL

Correct Answer: C

Explanation:

30 × 4 = 120 mL

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Question (29)

QN004698

A plate initially contains 80 mL water. After evaporation, 20 mL remains. What fraction of the original water evaporated?

(A) 1/4
(B) 1/2
(C) 3/4
(D) 4/5

Correct Answer: C

Explanation:

Evaporated = 60 mL; 60/80 = 3/4

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Question (30)

QN004699

A puddle contains 120 mL water. If 25% evaporates, how much water remains?

(A) 30 mL
(B) 60 mL
(C) 90 mL
(D) 100 mL

Correct Answer: C

Explanation:

Remaining = 75% of 120 = 90 Ml

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Question (21)

Which pair shows examples of evaporation?

Explanation:

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Question (22)

A spoonful of water disappears from a steel plate kept indoors. What is the most scientific explanation?

Explanation:

Link:

Question (23)

Which investigation best tests whether water seeps through a steel plate?

Explanation:

Link:

Question (24)

If water disappeared because of seeping through steel, what should be observed?

Explanation:

Link:

Question (25)

A puddle contains 500 mL water in the morning and 300 mL in the evening. Assuming no seepage, how much water evaporated?

Explanation:

Link:

Question (26)

A steel plate has 25 mL water. After evaporation, 0 mL remains. What percentage of water evaporated?

Explanation:

Link:

Question (27)

A student observes 60 mL water reducing to 45 mL after some time due to evaporation. How much water disappeared?

Explanation:

Link:

Question (28)

If a puddle loses 30 mL of water every hour by evaporation, how much water disappears in 4 hours?

Explanation:

Link:

Question (29)

A plate initially contains 80 mL water. After evaporation, 20 mL remains. What fraction of the original water evaporated?

Explanation:

Link:

Question (30)

A puddle contains 120 mL water. If 25% evaporates, how much water remains?

Explanation:

Link:

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