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Questions

Question (1)

QN00101

Materials that allow electric current to pass through them easily are called

(A) insulators
(B) conductors
(C) semiconductors
(D) magnets

Correct Answer: B

Explanation:

Conductors allow electric current to pass through them.

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Question (2)

QN00102

Which of the following is a good electrical conductor?

(A) Rubber
(B) Plastic
(C) Copper
(D) Wood

Correct Answer: C

Explanation:

Copper is a good conductor of electricity.

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Question (3)

QN00103

Materials that do not allow electric current to pass through them are called

(A) conductors
(B) connectors
(C) insulators
(D) filaments

Correct Answer: C

Explanation:

Insulators block the flow of electric current.

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Question (4)

QN00104

Which of the following is an electrical insulator?

(A) Iron nail
(B) Aluminium foil
(C) Plastic ruler
(D) Copper wire

Correct Answer: C

Explanation:

Plastic is an insulator.

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Question (5)

QN00105

Why are copper and aluminium commonly used in electric wires?

(A) They are transparent
(B) They are good conductors of electricity
(C) They are soft insulators
(D) They produce electricity automatically

Correct Answer: B

Explanation:

Copper and aluminium conduct electricity effectively.

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Question (6)

QN00106

The plastic covering around electric wires is used because plastic is

(A) a conductor
(B) an insulator
(C) magnetic
(D) a source of current

Correct Answer: B

Explanation:

Plastic prevents electric shocks because it is an insulator.

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Question (7)

QN00107

A student inserts a steel spoon into a testing circuit and the bulb glows. This shows that steel is a

(A) poor conductor
(B) magnetic material only
(C) conductor of electricity
(D) non-metal

Correct Answer: C

Explanation:

Glowing bulb indicates that steel conducts electricity.

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Question (8)

QN00108

A bulb does not glow when a wooden stick is connected in a testing circuit. This indicates that wood is

(A) a conductor
(B) an insulator
(C) a battery
(D) a filament

Correct Answer: B

Explanation:

Wood does not allow current to pass easily.

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Question (9)

QN00109

Which property of conductors makes them useful in electrical circuits?

(A) They block current flow
(B) They allow current to pass through them
(C) They melt quickly
(D) They store electricity permanently

Correct Answer: B

Explanation:

Conductors allow electric current to flow.

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Question (10)

QN00110

Which of the following combinations contains only insulators?

(A) Copper, aluminium
(B) Iron, steel
(C) Plastic, rubber
(D) Silver, graphite

Correct Answer: C

Explanation:

Plastic and rubber are insulators.

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