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Question (11)

QN001171

Which statement correctly explains the role of the wick in a candle?

(A) It produces oxygen
(B) It absorbs heat and carries melted wax upward
(C) It changes wax into water
(D) It prevents wax from melting

Correct Answer: B

Explanation:

The wick helps melted wax reach the flame.

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Question (12)

QN001172

Wax vapour burns only after

(A) freezing
(B) condensing
(C) vaporisation
(D) rusting

Correct Answer: C

Explanation:

Wax must first change into vapour before burning.

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Question (13)

QN001173

Which of the following occurs during candle burning without formation of a new substance?

(A) Combustion of wax vapour
(B) Formation of carbon dioxide
(C) Melting of wax
(D) Formation of soot

Correct Answer: C

Explanation:

Melting changes only the physical state.

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Question (14)

QN001174

Which observation proves that a chemical change occurs in a candle flame?

(A) Wax changes from solid to liquid
(B) Heat and light are produced
(C) Wax becomes soft
(D) Wax regains shape on cooling

Correct Answer: B

Explanation:

Heat and light production indicates combustion.

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Question (15)

QN001175

The production of carbon dioxide and water vapour during candle burning indicates

(A) only physical change
(B) only melting
(C) formation of new substances
(D) cooling effect only

Correct Answer: C

Explanation:

New substances are formed during combustion.

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Question (16)

QN001176

Which process in a candle can continue only in the presence of oxygen?

(A) Wax melting
(B) Wax solidification
(C) Burning of wax vapour
(D) Cooling of wax

Correct Answer: C

Explanation:

Combustion requires oxygen.

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Question (17)

QN001177

If oxygen supply around a candle is cut off, which process stops immediately?

(A) Wax melting
(B) Combustion
(C) Capillary action
(D) Softening of wax

Correct Answer: B

Explanation:

Burning stops when oxygen is absent.

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Question (18)

QN001178

Which process in a candle is responsible for shortening its length over time?

(A) Wax melting only
(B) Combustion of wax vapour
(C) Condensation of wax
(D) Cooling of wick

Correct Answer: B

Explanation:

Wax is consumed during combustion.

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Question (19)

QN001179

Which of the following changes in a candle is temporary?

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

Correct Answer: C

Explanation:

Melted wax can solidify again.

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Question (20)

QN001180

Which of the following changes in a candle is permanent?

(A) Wax melting
(B) Wax solidifying
(C) Burning of wax vapour
(D) Softening of wax

Correct Answer: C

Explanation:

Burning forms new substances permanently.

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Question (11)

Which statement correctly explains the role of the wick in a candle?

Explanation:

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Question (12)

Wax vapour burns only after

Explanation:

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Question (13)

Which of the following occurs during candle burning without formation of a new substance?

Explanation:

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Question (14)

Which observation proves that a chemical change occurs in a candle flame?

Explanation:

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Question (15)

The production of carbon dioxide and water vapour during candle burning indicates

Explanation:

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Question (16)

Which process in a candle can continue only in the presence of oxygen?

Explanation:

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Question (17)

If oxygen supply around a candle is cut off, which process stops immediately?

Explanation:

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Question (18)

Which process in a candle is responsible for shortening its length over time?

Explanation:

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Question (19)

Which of the following changes in a candle is temporary?

Explanation:

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Question (20)

Which of the following changes in a candle is permanent?

Explanation:

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