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Question (11)

QN00151

If a wooden strip is used instead of a metal strip in the pin experiment, the pins will not fall because wood is —

(A) heavier than metal
(B) a poor conductor of heat
(C) softer than metal
(D) melted by heat

Correct Answer: B

Explanation:

Wood does not transfer heat effectively.

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Question (12)

QN00152

Air trapped inside woollen clothes helps us feel warm because air is —

(A) a good conductor of heat
(B) a poor conductor of heat
(C) hot by nature
(D) heavier in winter

Correct Answer: B

Explanation:

Air acts as an insulator.

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Question (13)

QN00153

Two thin blankets keep us warmer than one thick blanket mainly because —

(A) thin blankets are heavier
(B) air gets trapped between the blankets
(C) thick blankets absorb cold
(D) wool produces heat

Correct Answer: B

Explanation:

Trapped air reduces heat loss.

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Question (14)

QN00154

Houses in very cold Himalayan regions often have walls filled with mud and wood because these materials —

(A) produce heat
(B) absorb sunlight completely
(C) are poor conductors of heat
(D) are waterproof

Correct Answer: C

Explanation:

Poor conductors reduce heat transfer.

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Question (15)

QN00155

Hollow bricks are used in outer walls because they contain trapped —

(A) steam
(B) smoke
(C) air
(D) water vapour

Correct Answer: C

Explanation:

Trapped air acts as an insulator.

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Question (16)

QN00156

A steel spoon and a wooden spoon are kept in hot soup for five minutes. Which spoon will feel hotter when touched?

(A) Wooden spoon
(B) Steel spoon
(C) Both equally hot
(D) Neither spoon

Correct Answer: B

Explanation:

Steel transfers heat faster than wood.

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Question (17)

QN00157

A child touches the handle of a metal pan kept on a stove and feels heat quickly. This is due to —

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

Correct Answer: C

Explanation:

Heat travels through the metal handle by conduction.

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Question (18)

QN00158

Which arrangement is best for keeping ice cream cold for a longer time?

(A) Steel box
(B) Copper box
(C) Wooden container
(D) Aluminium tray

Correct Answer: C

Explanation:

Wood is a poor conductor of heat.

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Question (19)

QN00159

The particles in conduction transfer heat by —

(A) moving from place to place
(B) flowing upward
(C) passing energy to neighbouring particles
(D) melting completely

Correct Answer: C

Explanation:

Heat energy passes from one particle to another.

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Question (20)

QN00160

A blacksmith uses iron tongs with wooden handles because wood —

(A) is attractive
(B) is a poor conductor of heat
(C) melts quickly
(D) becomes hot rapidly

Correct Answer: B

Explanation:

Wooden handles protect hands from heat.

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Question (11)

If a wooden strip is used instead of a metal strip in the pin experiment, the pins will not fall because wood is —

Explanation:

Link:

Question (12)

Air trapped inside woollen clothes helps us feel warm because air is —

Explanation:

Link:

Question (13)

Two thin blankets keep us warmer than one thick blanket mainly because —

Explanation:

Link:

Question (14)

Houses in very cold Himalayan regions often have walls filled with mud and wood because these materials —

Explanation:

Link:

Question (15)

Hollow bricks are used in outer walls because they contain trapped —

Explanation:

Link:

Question (16)

A steel spoon and a wooden spoon are kept in hot soup for five minutes. Which spoon will feel hotter when touched?

Explanation:

Link:

Question (17)

A child touches the handle of a metal pan kept on a stove and feels heat quickly. This is due to —

Explanation:

Link:

Question (18)

Which arrangement is best for keeping ice cream cold for a longer time?

Explanation:

Link:

Question (19)

The particles in conduction transfer heat by —

Explanation:

Link:

Question (20)

A blacksmith uses iron tongs with wooden handles because wood —

Explanation:

Link:

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