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Question (1)

QN0029713

A steel spoon placed in a cup of hot tea becomes hot after some time. Which process is mainly responsible for this?

(A) Radiation
(B) Conduction
(C) Evaporation
(D) Condensation

Correct Answer: B

Explanation:

Heat travels through the solid spoon by conduction.

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Question (2)

QN0029714

Why are cooking utensils generally made of metals?

(A) Metals are poor conductors of heat
(B) Metals absorb water easily
(C) Metals conduct heat efficiently
(D) Metals are lighter than plastic

Correct Answer: C

Explanation:

Good conductors help transfer heat quickly while cooking.

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Question (3)

QN0029715

A student touches a wooden chair and a steel chair kept in the same room. The steel chair feels colder because —

(A) steel has lower temperature
(B) steel conducts heat away from the hand faster
(C) wood produces heat
(D) steel contains water

Correct Answer: B

Explanation:

Steel is a good conductor and removes heat quickly from the hand.

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Question (4)

QN0029716

Which of the following materials is the best insulator of heat?

(A) Copper
(B) Iron
(C) Plastic
(D) Aluminium

Correct Answer: C

Explanation:

Plastic is a poor conductor of heat.

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Question (5)

QN0029717

Why are handles of cooking pans often made of wood or bakelite?

(A) They are shiny
(B) They are poor conductors of heat
(C) They absorb heat quickly
(D) They melt easily

Correct Answer: B

Explanation:

Insulating handles prevent burns.

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Question (6)

QN0029718

A metal rod and a glass rod are heated at one end. Wax attached to the metal rod melts faster because metal —

(A) reflects heat
(B) conducts heat better
(C) absorbs less heat
(D) cools faster

Correct Answer: B

Explanation:

Metals transfer heat rapidly by conduction.

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Question (7)

QN0029719

Which process mainly causes warm air near a heater to rise upward?

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

Correct Answer: C

Explanation:

Warm air becomes lighter and rises.

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Question (8)

QN0029720

Sea breeze usually blows during the daytime because —

(A) sea heats faster than land
(B) land heats faster than sea
(C) both heat equally
(D) wind direction changes randomly

Correct Answer: B

Explanation:

Warm air above land rises and cooler sea air moves in.

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Question (9)

QN0029721

During nighttime, land cools faster than sea. This results in —

(A) sea breeze
(B) radiation only
(C) land breeze
(D) no air movement

Correct Answer: C

Explanation:

Cooler air from land moves toward the sea.

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Question (10)

QN0029722

A room heater is usually placed near the floor because —

(A) heat always moves downward
(B) warm air rises and circulates
(C) cold air rises upward
(D) radiation occurs only near the floor

Correct Answer: B

Explanation:

Convection currents distribute heat through the room.

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Question (1)

A steel spoon placed in a cup of hot tea becomes hot after some time. Which process is mainly responsible for this?

Explanation:

Link:

Question (2)

Why are cooking utensils generally made of metals?

Explanation:

Link:

Question (3)

A student touches a wooden chair and a steel chair kept in the same room. The steel chair feels colder because —

Explanation:

Link:

Question (4)

Which of the following materials is the best insulator of heat?

Explanation:

Link:

Question (5)

Why are handles of cooking pans often made of wood or bakelite?

Explanation:

Link:

Question (6)

A metal rod and a glass rod are heated at one end. Wax attached to the metal rod melts faster because metal —

Explanation:

Link:

Question (7)

Which process mainly causes warm air near a heater to rise upward?

Explanation:

Link:

Question (8)

Sea breeze usually blows during the daytime because —

Explanation:

Link:

Question (9)

During nighttime, land cools faster than sea. This results in —

Explanation:

Link:

Question (10)

A room heater is usually placed near the floor because —

Explanation:

Link:

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