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Questions

Question (1)

QN00181

Which process of heat transfer takes place by the actual movement of particles?

(A) Conduction
(B) Radiation
(C) Convection
(D) Reflection

Correct Answer: C

Explanation:

In convection, particles themselves move and transfer heat.

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Question (2)

QN00182

Convection mainly occurs in —

(A) solids only
(B) liquids and gases
(C) solids and gases only
(D) vacuum only

Correct Answer: B

Explanation:

Convection occurs in fluids such as liquids and gases.

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Question (3)

QN00183

In the paper cup activity, the cup above the candle rises because the air inside it becomes —

(A) colder and heavier
(B) hotter and lighter
(C) denser and cooler
(D) filled with smoke

Correct Answer: B

Explanation:

Heated air expands and becomes lighter.

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Question (4)

QN00184

Smoke from a burning incense stick rises upward mainly due to —

(A) conduction
(B) convection
(C) evaporation
(D) condensation

Correct Answer: B

Explanation:

Hot smoke rises because of convection currents.

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Question (5)

QN00185

Which statement correctly defines convection?

(A) Heat transfer without medium
(B) Heat transfer by actual movement of particles
(C) Heat transfer only in solids
(D) Heat transfer by light rays

Correct Answer: B

Explanation:

Convection occurs through movement of particles.

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Question (6)

QN00186

In heated water, the warmer water rises because it becomes —

(A) darker
(B) heavier
(C) lighter
(D) colourless

Correct Answer: C

Explanation:

Heated water expands and becomes lighter.

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Question (7)

QN00187

During convection in water, cooler water moves —

(A) upward from the centre
(B) downward from the sides
(C) only upward
(D) only sideways

Correct Answer: B

Explanation:

Cooler and heavier water moves downward.

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Question (8)

QN00188

Which material demonstrates convection most effectively?

(A) Iron rod
(B) Wooden plank
(C) Water
(D) Glass sheet

Correct Answer: C

Explanation:

Convection occurs in liquids like water.

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Question (9)

QN00189

A partially inflated balloon becomes larger in sunlight because the air inside —

(A) contracts
(B) cools rapidly
(C) expands on heating
(D) becomes heavier

Correct Answer: C

Explanation:

Heated air expands and increases balloon size.

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Question (10)

QN00190

The movement of coloured streaks upward in heated water shows —

(A) reflection
(B) radiation
(C) convection currents
(D) melting

Correct Answer: C

Explanation:

Coloured streaks trace convection currents.

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