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Question (1)

QN001881

What happens to a nichrome wire when electric current passes through it for some time?

(A) It melts immediately
(B) It becomes cold
(C) It becomes warm
(D) It changes colour permanently

Correct Answer: C

Explanation:

Nichrome wire becomes warm due to heating effect of electric current.

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Question (2)

QN001882

The warming of a conductor due to flow of electric current is called

(A) magnetic effect of current
(B) heating effect of current
(C) chemical effect of current
(D) cooling effect of current

Correct Answer: B

Explanation:

Heating of conductor due to current is called heating effect of electric current.

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Question (3)

QN001883

Why does a wire become hot when electric current flows through it?

(A) Due to magnetic field only
(B) Due to resistance offered by the wire
(C) Due to oxygen in air
(D) Due to sunlight falling on it

Correct Answer: B

Explanation:

Resistance converts electrical energy into heat energy.

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Question (4)

QN001884

Nichrome wire produces more heat than copper wire of same size because nichrome has

(A) lower resistance
(B) greater thickness
(C) higher resistance
(D) no free electrons

Correct Answer: C

Explanation:

Nichrome has higher resistance than copper.

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Question (5)

QN001885

A student touches a nichrome wire before switching ON the circuit and again after 30 seconds of current flow. The wire feels warmer after switching ON because

(A) current produces cooling effect
(B) electrical energy changes into heat energy
(C) the wire absorbs water vapour
(D) magnetic poles are formed

Correct Answer: B

Explanation:

Electrical energy changes into heat energy in the wire.

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Question (6)

QN001886

Which material is specially used in the activity demonstrating heating effect of electric current?

(A) Aluminium
(B) Iron
(C) Nichrome
(D) Silver

Correct Answer: C

Explanation:

Nichrome wire is used because it produces noticeable heating.

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Question (7)

QN001887

If the same nichrome wire is connected to two cells instead of one, the wire will

(A) produce less heat
(B) become cooler
(C) heat up more
(D) stop conducting current

Correct Answer: C

Explanation:

Two cells produce larger current and more heat.

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Question (8)

QN001888

The amount of heat produced in a wire depends on

(A) material of wire only
(B) thickness only
(C) duration of current flow only
(D) all of these factors

Correct Answer: D

Explanation:

Heat depends on material, thickness, length and duration of current flow.

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Question (9)

QN001889

Two wires of same material and thickness but different lengths are connected separately in the same circuit. Which wire produces more heat?

(A) Shorter wire
(B) Longer wire
(C) Both equally
(D) Neither produces heat

Correct Answer: B

Explanation:

Longer wire offers greater resistance and produces more heat.

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Question (10)

QN001890

Two nichrome wires of equal length but different thickness are connected separately in the same circuit. Which wire becomes hotter?

(A) Thicker wire
(B) Thinner wire
(C) Both equally
(D) Neither wire heats

Correct Answer: B

Explanation:

Thinner wire has greater resistance and heats more.

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Question (1)

What happens to a nichrome wire when electric current passes through it for some time?

Explanation:

Link:

Question (2)

The warming of a conductor due to flow of electric current is called

Explanation:

Link:

Question (3)

Why does a wire become hot when electric current flows through it?

Explanation:

Link:

Question (4)

Nichrome wire produces more heat than copper wire of same size because nichrome has

Explanation:

Link:

Question (5)

A student touches a nichrome wire before switching ON the circuit and again after 30 seconds of current flow. The wire feels warmer after switching ON because

Explanation:

Link:

Question (6)

Which material is specially used in the activity demonstrating heating effect of electric current?

Explanation:

Link:

Question (7)

If the same nichrome wire is connected to two cells instead of one, the wire will

Explanation:

Link:

Question (8)

The amount of heat produced in a wire depends on

Explanation:

Link:

Question (9)

Two wires of same material and thickness but different lengths are connected separately in the same circuit. Which wire produces more heat?

Explanation:

Link:

Question (10)

Two nichrome wires of equal length but different thickness are connected separately in the same circuit. Which wire becomes hotter?

Explanation:

Link:

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