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Question (21)

QN004922

In the diagram of state changes, which process connects liquid water to solid ice?

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

Correct Answer: A

Explanation:

Freezing converts liquid water into solid ice.

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Question (22)

QN004923

In the diagram of state changes, which process connects solid ice to liquid water?

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

Correct Answer: C

Explanation:

Melting converts solid ice into liquid water.

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Question (23)

QN004924

A student observes 60 ice cubes. If 40% melt, how many cubes become water?

(A) 20
(B) 24
(C) 30
(D) 36

Correct Answer: B

Explanation:

40% of 60 = 24 cubes.

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Question (24)

QN004925

A freezer contains 80 bottles of water. If 75% freeze overnight, how many bottles contain ice?

(A) 40
(B) 50
(C) 60
(D) 70

Correct Answer: C

Explanation:

75% of 80 = 60 bottles.

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Question (25)

QN004926

A wax model contains 90 pieces of wax. If half melt on heating, how many pieces melt?

(A) 30
(B) 40
(C) 45
(D) 50

Correct Answer: C

Explanation:

Half of 90 = 45 pieces.

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Question (26)

QN004927

A science club freezes 120 cups of water. If one-fourth remain unfrozen, how many cups freeze?

(A) 30
(B) 60
(C) 90
(D) 120

Correct Answer: C

Explanation:

120 − 30 = 90 cups freeze.

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Question (27)

QN004928

A student heats 72 ice cubes. If 54 melt, what fraction of the cubes melted?

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

Correct Answer: C

Explanation:

54/72 = 3/4.

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Question (28)

QN004929

Out of 150 wax blocks, 90 become liquid on heating. What percentage melted?

(A) 40%
(B) 50%
(C) 60%
(D) 70%

Correct Answer: C

Explanation:

(90/150) × 100 = 60%.

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Question (29)

QN004930

A tray has 64 cubes of ice. If 16 remain solid after warming, how many melted?

(A) 32
(B) 40
(C) 48
(D) 56

Correct Answer: C

Explanation:

64 − 16 = 48 cubes melted.

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Question (30)

QN004931

A student freezes water in 200 moulds. If 10% do not freeze, how many moulds contain ice?

(A) 160
(B) 170
(C) 180
(D) 190

Correct Answer: C

Explanation:

90% of 200 = 180 moulds.

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Question (21)

In the diagram of state changes, which process connects liquid water to solid ice?

Explanation:

Link:

Question (22)

In the diagram of state changes, which process connects solid ice to liquid water?

Explanation:

Link:

Question (23)

A student observes 60 ice cubes. If 40% melt, how many cubes become water?

Explanation:

Link:

Question (24)

A freezer contains 80 bottles of water. If 75% freeze overnight, how many bottles contain ice?

Explanation:

Link:

Question (25)

A wax model contains 90 pieces of wax. If half melt on heating, how many pieces melt?

Explanation:

Link:

Question (26)

A science club freezes 120 cups of water. If one-fourth remain unfrozen, how many cups freeze?

Explanation:

Link:

Question (27)

A student heats 72 ice cubes. If 54 melt, what fraction of the cubes melted?

Explanation:

Link:

Question (28)

Out of 150 wax blocks, 90 become liquid on heating. What percentage melted?

Explanation:

Link:

Question (29)

A tray has 64 cubes of ice. If 16 remain solid after warming, how many melted?

Explanation:

Link:

Question (30)

A student freezes water in 200 moulds. If 10% do not freeze, how many moulds contain ice?

Explanation:

Link:

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