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Question (31)

QN001191

A student notices liquid wax near the wick of a burning candle. This liquid wax forms due to

(A) condensation
(B) melting caused by heat
(C) chemical decomposition
(D) oxidation

Correct Answer: B

Explanation:

Heat from the flame melts the wax.

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Question (32)

QN001192

Which process in a burning candle demonstrates energy release?

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

Correct Answer: C

Explanation:

Combustion releases heat and light energy.

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Question (33)

QN001193

Which change in a candle can occur even without oxygen?

(A) Combustion of vapour
(B) Burning of wick
(C) Wax melting due to external heat
(D) Formation of carbon dioxide

Correct Answer: C

Explanation:

Melting can occur by heating without combustion.

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Question (34)

QN001194

The black deposit sometimes formed above a candle flame is called

(A) rust
(B) soot
(C) lime
(D) ash

Correct Answer: B

Explanation:

Soot is formed during incomplete combustion.

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Question (35)

QN001195

Soot formation during candle burning indicates

(A) incomplete combustion
(B) complete freezing
(C) only physical change
(D) evaporation only

Correct Answer: A

Explanation:

Incomplete combustion produces soot.

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Question (36)

QN001196

Which concept from the chapter is best demonstrated by candle burning?

(A) Only physical changes are reversible
(B) Physical and chemical changes may occur together
(C) Chemical changes never release heat
(D) Physical changes form new substances

Correct Answer: B

Explanation:

Candle burning shows both types of changes together.

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Question (37)

QN001197

Which process in candle burning is associated with change in state only?

(A) Combustion
(B) Formation of smoke
(C) Melting of wax
(D) Burning of vapour

Correct Answer: C

Explanation:

Melting changes only the physical state.

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Question (38)

QN001198

Which statement correctly compares melting and burning of wax?

(A) Both are chemical changes
(B) Both are physical changes
(C) Melting is physical while burning is chemical
(D) Melting is chemical while burning is physical

Correct Answer: C

Explanation:

Melting does not form new substances, but burning does.

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Question (39)

QN001199

A candle flame continues burning because melted wax continuously

(A) freezes near the wick
(B) changes into vapour and burns
(C) absorbs carbon dioxide
(D) removes oxygen from air

Correct Answer: B

Explanation:

Wax vapour burns continuously in the flame.

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Question (40)

QN001200

Which of the following situations best supports the idea that one process may involve more than one type of change?

(A) Rusting iron nail
(B) Folding paper fan
(C) Burning candle with melting wax
(D) Breaking glass bottle

Correct Answer: C

Explanation:

Candle burning includes both physical and chemical changes together.

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Question (31)

A student notices liquid wax near the wick of a burning candle. This liquid wax forms due to

Explanation:

Link:

Question (32)

Which process in a burning candle demonstrates energy release?

Explanation:

Link:

Question (33)

Which change in a candle can occur even without oxygen?

Explanation:

Link:

Question (34)

The black deposit sometimes formed above a candle flame is called

Explanation:

Link:

Question (35)

Soot formation during candle burning indicates

Explanation:

Link:

Question (36)

Which concept from the chapter is best demonstrated by candle burning?

Explanation:

Link:

Question (37)

Which process in candle burning is associated with change in state only?

Explanation:

Link:

Question (38)

Which statement correctly compares melting and burning of wax?

Explanation:

Link:

Question (39)

A candle flame continues burning because melted wax continuously

Explanation:

Link:

Question (40)

Which of the following situations best supports the idea that one process may involve more than one type of change?

Explanation:

Link:

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