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Question (11)

QN001211

Which of the following changes is temporary?

(A) Rusting iron
(B) Burning leaves
(C) Dissolving sugar in water
(D) Cooking vegetables

Correct Answer: C

Explanation:

Sugar can be recovered by evaporation.

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Question (12)

QN001212

Why is rusting considered a permanent change?

(A) Iron changes shape only
(B) Rust evaporates quickly
(C) A new substance called rust forms
(D) Iron becomes soft temporarily

Correct Answer: C

Explanation:

Rusting forms iron oxide permanently.

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Question (13)

QN001213

Which process involves only a change in state and not formation of a new substance?

(A) Burning wood
(B) Melting ice
(C) Cooking food
(D) Digestion of food

Correct Answer: B

Explanation:

Melting changes only the physical state.

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Question (14)

QN001214

Which of the following changes is both physical and reversible?

(A) Folding clothes
(B) Burning paper
(C) Rusting iron
(D) Baking bread

Correct Answer: A

Explanation:

Folding changes only shape temporarily.

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Question (15)

QN001215

Which statement about permanent changes is correct?

(A) They can always be reversed easily
(B) They never form new substances
(C) They are usually irreversible
(D) They involve only change in shape

Correct Answer: C

Explanation:

Permanent changes are difficult to reverse.

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Question (16)

QN001216

A clay toy is reshaped into another form without adding new material. This is an example of

(A) permanent change
(B) reversible physical change
(C) combustion
(D) chemical reaction

Correct Answer: B

Explanation:

Clay can be reshaped again.

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Question (17)

QN001217

Which process below changes both the composition and properties of a substance permanently?

(A) Melting wax
(B) Breaking glass
(C) Burning fuel
(D) Freezing juice

Correct Answer: C

Explanation:

Burning changes the chemical composition.

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Question (18)

QN001218

Which of the following can return to its original form naturally after the change?

(A) Burnt ash
(B) Rusted iron
(C) Melted ice refreezing
(D) Cooked rice

Correct Answer: C

Explanation:

Water can freeze back into ice.

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Question (19)

QN001219

Which of the following is an irreversible change caused by heating?

(A) Melting butter
(B) Boiling water
(C) Cooking chapati
(D) Freezing juice

Correct Answer: C

Explanation:

Cooking forms new substances and flavours.

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Question (20)

QN001220

Which statement best explains why melting is reversible?

(A) Melting forms gases
(B) Melted substances can often solidify again
(C) Melting always changes colour
(D) Melting forms new substances

Correct Answer: B

Explanation:

Solidification can reverse melting.

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Question (11)

Which of the following changes is temporary?

Explanation:

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Question (12)

Why is rusting considered a permanent change?

Explanation:

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Question (13)

Which process involves only a change in state and not formation of a new substance?

Explanation:

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Question (14)

Which of the following changes is both physical and reversible?

Explanation:

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Question (15)

Which statement about permanent changes is correct?

Explanation:

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Question (16)

A clay toy is reshaped into another form without adding new material. This is an example of

Explanation:

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Question (17)

Which process below changes both the composition and properties of a substance permanently?

Explanation:

Link:

Question (18)

Which of the following can return to its original form naturally after the change?

Explanation:

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Question (19)

Which of the following is an irreversible change caused by heating?

Explanation:

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Question (20)

Which statement best explains why melting is reversible?

Explanation:

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