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Question (1)

QN001201

A change that cannot be reversed easily is called

(A) temporary change
(B) reversible change
(C) permanent change
(D) periodic change

Correct Answer: C

Explanation:

Permanent changes cannot be reversed easily.

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Question (2)

QN001202

Which of the following is a reversible change?

(A) Burning paper
(B) Rusting iron
(C) Melting ice
(D) Cooking food

Correct Answer: C

Explanation:

Melted ice can freeze again.

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Question (3)

QN001203

Which process is an example of a permanent change?

(A) Folding paper
(B) Freezing water
(C) Burning wood
(D) Melting butter

Correct Answer: C

Explanation:

Burning wood forms new substances permanently.

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Question (4)

QN001204

Why is burning paper considered a permanent change?

(A) Paper changes colour only
(B) New substances are formed
(C) Shape changes temporarily
(D) Paper becomes soft

Correct Answer: B

Explanation:

Burning forms ash and gases.

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Question (5)

QN001205

Which of the following changes can be reversed by cooling?

(A) Burning candle wick
(B) Melting chocolate
(C) Rusting iron
(D) Cooking rice

Correct Answer: B

Explanation:

Melted chocolate solidifies on cooling.

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Question (6)

QN001206

Which statement correctly defines a reversible change?

(A) A change forming new substances
(B) A change that can be undone
(C) A change involving burning only
(D) A change producing heat always

Correct Answer: B

Explanation:

Reversible changes can return to the original state.

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Question (7)

QN001207

Which of the following is NOT a reversible change?

(A) Inflating a balloon
(B) Melting wax
(C) Baking cake
(D) Freezing water

Correct Answer: C

Explanation:

Baking cake forms new substances permanently.

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Question (8)

QN001208

Which observation best indicates a permanent change?

(A) Temporary change in shape
(B) Change of state only
(C) Formation of new substances
(D) Cooling after heating

Correct Answer: C

Explanation:

Permanent changes usually form new substances.

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Question (9)

QN001209

A student melts butter and later cools it back into solid form. This shows that melting butter is

(A) a chemical change only
(B) an irreversible change
(C) a reversible change
(D) a permanent change

Correct Answer: C

Explanation:

Melted butter solidifies again on cooling.

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Question (10)

QN001210

Which process below is irreversible because the original material cannot be obtained back easily?

(A) Melting ice
(B) Stretching rubber band
(C) Tearing cloth
(D) Condensing steam

Correct Answer: C

Explanation:

Torn cloth cannot easily return to original form.

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Question (1)

A change that cannot be reversed easily is called

Explanation:

Link:

Question (2)

Which of the following is a reversible change?

Explanation:

Link:

Question (3)

Which process is an example of a permanent change?

Explanation:

Link:

Question (4)

Why is burning paper considered a permanent change?

Explanation:

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Question (5)

Which of the following changes can be reversed by cooling?

Explanation:

Link:

Question (6)

Which statement correctly defines a reversible change?

Explanation:

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Question (7)

Which of the following is NOT a reversible change?

Explanation:

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Question (8)

Which observation best indicates a permanent change?

Explanation:

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Question (9)

A student melts butter and later cools it back into solid form. This shows that melting butter is

Explanation:

Link:

Question (10)

Which process below is irreversible because the original material cannot be obtained back easily?

Explanation:

Link:

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