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Question (21)

QN001861

Which factor does NOT affect the heat produced in a wire?

(A) Material of wire
(B) Length of wire
(C) Thickness of wire
(D) Colour of insulation

Correct Answer: D

Explanation:

Colour of insulation does not affect heat generation.

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Question (22)

QN001862

A thin nichrome wire and a thick nichrome wire of same length are connected separately in the same circuit. Which heats more?

(A) Thick wire
(B) Thin wire
(C) Both equally
(D) Neither heats

Correct Answer: B

Explanation:

Thin wire has greater resistance and heats more.

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Question (23)

QN001863

Two nichrome wires have same thickness but different lengths. Which wire heats more for the same current duration?

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

Correct Answer: B

Explanation:

Longer wire has greater resistance.

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Question (24)

QN001864

Which household appliance mainly uses the heating effect of electric current?

(A) Compass
(B) Electromagnet crane
(C) Electric iron
(D) Bar magnet

Correct Answer: C

Explanation:

Electric iron works on heating effect of current.

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Question (25)

QN001865

An electric heater stops giving heat although current is flowing in the circuit. The most likely reason is

(A) broken heating element
(B) compass nearby
(C) magnetic field vanished
(D) battery reversed

Correct Answer: A

Explanation:

Broken heating element stops heating effect.

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Question (26)

QN001866

Overheating in household wiring may cause

(A) cooling of plugs
(B) melting of plastic parts
(C) production of oxygen
(D) permanent magnetism in sockets

Correct Answer: B

Explanation:

Excess heating may melt plastic parts.

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Question (27)

QN001867

Why should appropriate wires and plugs be used in household circuits?

(A) To decorate switchboards
(B) To avoid unnecessary heating
(C) To increase magnetism
(D) To stop resistance completely

Correct Answer: B

Explanation:

Proper wires prevent overheating and accidents.

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Question (28)

QN001868

A lemon cell glows an LED only when

(A) copper and iron touch each other
(B) lemon juice acts as electrolyte
(C) no chemical reaction occurs
(D) pure water is used instead of lemon juice

Correct Answer: B

Explanation:

Lemon juice acts as electrolyte for current flow.

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Question (29)

QN001869

In a lemon cell experiment, replacing lemon juice with pure water will most likely

(A) increase LED brightness
(B) stop LED from glowing
(C) create stronger current
(D) produce heat only

Correct Answer: B

Explanation:

Pure water does not conduct electricity effectively.

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Question (30)

QN001870

In a Voltaic cell, the liquid that helps conduct electricity is called

(A) insulator
(B) electrode
(C) electrolyte
(D) resistor

Correct Answer: C

Explanation:

Electrolyte allows movement of charges in the cell.

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Question (21)

Which factor does NOT affect the heat produced in a wire?

Explanation:

Link:

Question (22)

A thin nichrome wire and a thick nichrome wire of same length are connected separately in the same circuit. Which heats more?

Explanation:

Link:

Question (23)

Two nichrome wires have same thickness but different lengths. Which wire heats more for the same current duration?

Explanation:

Link:

Question (24)

Which household appliance mainly uses the heating effect of electric current?

Explanation:

Link:

Question (25)

An electric heater stops giving heat although current is flowing in the circuit. The most likely reason is

Explanation:

Link:

Question (26)

Overheating in household wiring may cause

Explanation:

Link:

Question (27)

Why should appropriate wires and plugs be used in household circuits?

Explanation:

Link:

Question (28)

A lemon cell glows an LED only when

Explanation:

Link:

Question (29)

In a lemon cell experiment, replacing lemon juice with pure water will most likely

Explanation:

Link:

Question (30)

In a Voltaic cell, the liquid that helps conduct electricity is called

Explanation:

Link:

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