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Question (1)

QN001161

Which process in a burning candle is a physical change?

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

Correct Answer: C

Explanation:

Melting of wax changes only the state of wax.

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Question (2)

QN001162

Which process in a burning candle is a chemical change?

(A) Solidification of wax
(B) Evaporation of wax
(C) Burning of wax vapour
(D) Melting of wax

Correct Answer: C

Explanation:

Burning forms new substances like carbon dioxide and water vapour.

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Question (3)

QN001163

A burning candle demonstrates that

(A) only physical changes can occur together
(B) only chemical changes can occur together
(C) physical and chemical changes can occur simultaneously
(D) no change occurs during burning

Correct Answer: C

Explanation:

Candle burning includes both melting and combustion.

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Question (4)

QN001164

In a candle flame, wax first changes from solid to liquid. This is an example of

(A) combustion
(B) chemical change
(C) physical change
(D) oxidation

Correct Answer: C

Explanation:

Melting is a physical change.

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Question (5)

QN001165

The burning of wax vapour in a candle produces

(A) only liquid wax
(B) new substances along with heat and light
(C) only change in shape
(D) only cooling effect

Correct Answer: B

Explanation:

Combustion produces heat, light, and new substances.

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Question (6)

QN001166

Which pair correctly represents physical and chemical changes in a burning candle?

(A) Melting wax – physical; burning wax vapour – chemical
(B) Burning wax – physical; melting wax – chemical
(C) Wick burning – physical; wax melting – chemical
(D) Both are physical changes only

Correct Answer: A

Explanation:

Wax melting is physical, while burning is chemical.

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Question (7)

QN001167

Why is melting candle wax considered reversible?

(A) Wax disappears completely
(B) Melted wax can solidify again
(C) New substances form
(D) Oxygen reacts with wax

Correct Answer: B

Explanation:

Melted wax becomes solid again on cooling.

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Question (8)

QN001168

Why is burning candle wax considered irreversible?

(A) Wax melts during burning
(B) Wax changes colour
(C) New substances are formed during combustion
(D) The candle becomes shorter

Correct Answer: C

Explanation:

Burning forms new substances permanently.

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Question (9)

QN001169

Which process occurs first in a burning candle?

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

Correct Answer: C

Explanation:

Wax melts before it vaporises and burns.

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Question (10)

QN001170

In a candle, the melted wax moves upward through the wick mainly due to

(A) gravity
(B) magnetic force
(C) capillary action
(D) friction

Correct Answer: C

Explanation:

Capillary action pulls melted wax upward.

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Question (1)

Which process in a burning candle is a physical change?

Explanation:

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Question (2)

Which process in a burning candle is a chemical change?

Explanation:

Link:

Question (3)

A burning candle demonstrates that

Explanation:

Link:

Question (4)

In a candle flame, wax first changes from solid to liquid. This is an example of

Explanation:

Link:

Question (5)

The burning of wax vapour in a candle produces

Explanation:

Link:

Question (6)

Which pair correctly represents physical and chemical changes in a burning candle?

Explanation:

Link:

Question (7)

Why is melting candle wax considered reversible?

Explanation:

Link:

Question (8)

Why is burning candle wax considered irreversible?

Explanation:

Link:

Question (9)

Which process occurs first in a burning candle?

Explanation:

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Question (10)

In a candle, the melted wax moves upward through the wick mainly due to

Explanation:

Link:

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