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Question (31)

QN004700

A steel plate loses 18 mL water through evaporation. If it originally had 72 mL, what percentage evaporated?

(A) 20%
(B) 25%
(C) 30%
(D) 35%

Correct Answer: B

Explanation:

(18/72) × 100 = 25%

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Question (32)

QN004701

Water in a utensil decreases from 100 mL to 70 mL due to evaporation. What fraction remains?

(A) 1/4
(B) 1/3
(C) 2/3
(D) 7/10

Correct Answer: D

Explanation:

Remaining fraction = 70/100 = 7/10

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Question (33)

QN004702

A student places 50 mL water on a plate. After 5 hours, 10 mL remains. How much water evaporated?

(A) 30 mL
(B) 35 mL
(C) 40 mL
(D) 45 mL

Correct Answer: C

Explanation:

50 − 10 = 40 mL

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Question (34)

QN004703

If 12 mL water evaporates every 2 hours, how much evaporates in 8 hours?

(A) 24 mL
(B) 36 mL
(C) 48 mL
(D) 60 mL

Correct Answer: C

Explanation:

8 hours = 4 intervals; 12 × 4 = 48 mL

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Question (35)

QN004704

A puddle loses half of its 200 mL water due to evaporation. Water remaining is

(A) 50 mL
(B) 75 mL
(C) 100 mL
(D) 150 mL

Correct Answer: C

Explanation:

Half of 200 mL = 100 mL

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Question (36)

QN004705

Hand sanitiser disappears when rubbed on hands mainly because it

(A) freezes
(B) evaporates
(C) condenses
(D) melts

Correct Answer: B

Explanation:

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Question (37)

QN004706

Which statement best explains the disappearance of water from washed utensils?

(A) Water is absorbed by steel
(B) Water evaporates into the air
(C) Water changes into ice
(D) Water becomes metal

Correct Answer: B

Explanation:

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Question (38)

QN004707

A student claims that all disappearing water must soak into the surface below it. Which observation directly challenges this claim?

(A) Water disappears from a steel plate
(B) Water is colourless
(C) Water is liquid
(D) Water can freeze

Correct Answer: A

Explanation:

Steel does not absorb water, yet the water disappears.

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Question (39)

QN004708

Which situation involves both observation and investigation as used in the chapter?

(A) Seeing water disappear and testing it on a steel plate
(B) Memorising definitions only
(C) Reading a chapter without activities
(D) Drawing a picture only

Correct Answer: A

Explanation:

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Question (40)

QN004709

The most suitable explanation for water disappearing from puddles after rain is

(A) only seepage into the ground
(B) only freezing
(C) evaporation and sometimes seepage together
(D) conversion into dust

Correct Answer: C

Explanation:

Water may evaporate into air and some may also seep into the ground.

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Question (31)

A steel plate loses 18 mL water through evaporation. If it originally had 72 mL, what percentage evaporated?

Explanation:

Link:

Question (32)

Water in a utensil decreases from 100 mL to 70 mL due to evaporation. What fraction remains?

Explanation:

Link:

Question (33)

A student places 50 mL water on a plate. After 5 hours, 10 mL remains. How much water evaporated?

Explanation:

Link:

Question (34)

If 12 mL water evaporates every 2 hours, how much evaporates in 8 hours?

Explanation:

Link:

Question (35)

A puddle loses half of its 200 mL water due to evaporation. Water remaining is

Explanation:

Link:

Question (36)

Hand sanitiser disappears when rubbed on hands mainly because it

Explanation:

Link:

Question (37)

Which statement best explains the disappearance of water from washed utensils?

Explanation:

Link:

Question (38)

A student claims that all disappearing water must soak into the surface below it. Which observation directly challenges this claim?

Explanation:

Link:

Question (39)

Which situation involves both observation and investigation as used in the chapter?

Explanation:

Link:

Question (40)

The most suitable explanation for water disappearing from puddles after rain is

Explanation:

Link:

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