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Question (21)

QN001181

Which property of wax changes during melting?

(A) Chemical composition
(B) Shape and state
(C) Ability to burn
(D) Nature of substance

Correct Answer: B

Explanation:

Melting changes state and shape only.

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Question (22)

QN001182

Which statement best explains why candle burning is both a physical and chemical process?

(A) Wax changes colour only
(B) Wax undergoes melting and combustion together
(C) Wax disappears completely
(D) Only heat is produced

Correct Answer: B

Explanation:

Candle burning includes both physical and chemical changes.

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Question (23)

QN001183

During candle burning, which process does NOT form a new substance?

(A) Burning of wick
(B) Burning of wax vapour
(C) Melting of wax
(D) Formation of gases

Correct Answer: C

Explanation:

Melting only changes the state.

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Question (24)

QN001184

Which of the following is an analytical example of simultaneous changes?

(A) Ice melting
(B) Paper folding
(C) Candle wax melting while vapour burns
(D) Rusting iron

Correct Answer: C

Explanation:

Both physical and chemical changes occur together.

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Question (25)

QN001185

What happens to melted wax when the candle flame is extinguished?

(A) It burns completely
(B) It changes into a gas permanently
(C) It solidifies again
(D) It becomes ash

Correct Answer: C

Explanation:

Melted wax cools and becomes solid again.

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Question (26)

QN001186

Which observation indicates that the wax itself does not burn directly as a solid?

(A) Solid wax melts before burning
(B) Wax becomes cold
(C) Wax changes colour
(D) The wick becomes shorter

Correct Answer: A

Explanation:

Wax first melts and vaporises before burning.

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Question (27)

QN001187

Which of the following best represents a reversible change in candle burning?

(A) Formation of carbon dioxide
(B) Burning of wick
(C) Melting and solidifying wax
(D) Formation of smoke

Correct Answer: C

Explanation:

Wax can melt and solidify repeatedly.

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Question (28)

QN001188

Which of the following best represents an irreversible change in candle burning?

(A) Wax melting
(B) Wax cooling
(C) Combustion of wax vapour
(D) Softening of wax

Correct Answer: C

Explanation:

Combustion permanently forms new substances.

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Question (29)

QN001189

The heat produced in a candle flame helps mainly in

(A) freezing the wax
(B) vaporising the melted wax
(C) stopping capillary action
(D) removing oxygen

Correct Answer: B

Explanation:

Heat converts liquid wax into vapour.

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Question (30)

QN001190

Which sequence correctly describes candle burning?

(A) Burning → melting → freezing
(B) Melting → vaporisation → combustion
(C) Freezing → melting → combustion
(D) Condensation → rusting → burning

Correct Answer: B

Explanation:

Wax melts, vaporises, and then burns.

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Question (21)

Which property of wax changes during melting?

Explanation:

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Question (22)

Which statement best explains why candle burning is both a physical and chemical process?

Explanation:

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Question (23)

During candle burning, which process does NOT form a new substance?

Explanation:

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Question (24)

Which of the following is an analytical example of simultaneous changes?

Explanation:

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Question (25)

What happens to melted wax when the candle flame is extinguished?

Explanation:

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Question (26)

Which observation indicates that the wax itself does not burn directly as a solid?

Explanation:

Link:

Question (27)

Which of the following best represents a reversible change in candle burning?

Explanation:

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Question (28)

Which of the following best represents an irreversible change in candle burning?

Explanation:

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Question (29)

The heat produced in a candle flame helps mainly in

Explanation:

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Question (30)

Which sequence correctly describes candle burning?

Explanation:

Link:

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