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Questions

Question (1)

QN00141

In conduction of heat, heat flows from —

(A) colder part to hotter part
(B) hotter part to colder part
(C) both directions equally
(D) all parts at the same time

Correct Answer: B

Explanation:

Heat always flows from a hotter region to a colder region.

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Question (2)

QN00142

Which of the following is a good conductor of heat?

(A) Wood
(B) Glass
(C) Aluminium
(D) Plastic

Correct Answer: C

Explanation:

Aluminium allows heat to pass through it easily.

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Question (3)

QN00143

In the activity with pins fixed on a metal strip using wax, the first pin falls because —

(A) wax becomes heavier
(B) metal melts
(C) heat reaches the nearest pin first
(D) candle flame touches the pin

Correct Answer: C

Explanation:

Heat travels through the strip and melts the nearest wax first.

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Question (4)

QN00144

The process in which heat is transferred without movement of particles from their positions is called —

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

Correct Answer: C

Explanation:

In conduction, particles transfer heat without changing position.

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Question (5)

QN00145

A student heated one end of an iron rod. After some time, the other end also became hot. This shows that iron is —

(A) a poor conductor
(B) an insulator
(C) a good conductor
(D) transparent

Correct Answer: C

Explanation:

Iron conducts heat from one end to the other.

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Question (6)

QN00146

Why are cooking utensils generally made of metals?

(A) Metals are cheap
(B) Metals are shiny
(C) Metals are good conductors of heat
(D) Metals are soft

Correct Answer: C

Explanation:

Metals transfer heat quickly for cooking.

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Question (7)

QN00147

Which material among the following is a poor conductor of heat?

(A) Copper
(B) Steel
(C) Silver
(D) Clay

Correct Answer: D

Explanation:

Clay does not allow heat to pass through easily.

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Question (8)

QN00148

Tea remains hot longer in a porcelain cup because porcelain is —

(A) a good conductor of heat
(B) a poor conductor of heat
(C) magnetic
(D) transparent

Correct Answer: B

Explanation:

Porcelain reduces heat loss.

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Question (9)

QN00149

In the metal strip activity, four pins are fixed at equal distances. If the candle is moved closer to pin III, which pin is likely to fall first?

(A) Pin I
(B) Pin II
(C) Pin III
(D) Pin IV

Correct Answer: C

Explanation:

The pin nearest to the heated point receives heat first.

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Question (10)

QN00150

Which statement correctly defines conduction?

(A) Heat transfer through movement of liquids only
(B) Heat transfer without any medium
(C) Heat transfer from hotter part to colder part without movement of particles
(D) Heat transfer only through gases

Correct Answer: C

Explanation:

Conduction occurs without movement of particles.

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