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Question (21)

QN00121

Which statement correctly defines an electrical insulator?

(A) A material that allows electric current easily
(B) A material that stores electric current
(C) A material that does not allow electric current to pass through it
(D) A material used for making batteries

Correct Answer: C

Explanation:

Insulators do not allow electric current to pass through them.

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Question (22)

QN00122

Which material among the following is both a metal and a good conductor?

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

Correct Answer: C

Explanation:

Copper is a metallic conductor.

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Question (23)

QN00123

Why is rubber used in electrical gloves?

(A) Rubber is shiny
(B) Rubber is an insulator
(C) Rubber is magnetic
(D) Rubber produces current

Correct Answer: B

Explanation:

Rubber protects from electric shock.

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Question (24)

QN00124

A student tests a graphite pencil lead in a circuit and finds that the bulb glows dimly. This suggests that graphite is

(A) a conductor of electricity
(B) a perfect insulator
(C) a plastic material
(D) unable to conduct current

Correct Answer: A

Explanation:

Graphite conducts electricity.

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Question (25)

QN00125

Which material is safest for covering electrical wires in homes?

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

Correct Answer: C

Explanation:

Plastic is an insulating material.

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Question (26)

QN00126

Which of the following is most likely to conduct electricity?

(A) Dry wood
(B) Glass
(C) Steel spoon
(D) Eraser

Correct Answer: C

Explanation:

Steel is a conductor of electricity.

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Question (27)

QN00127

A student observes that a bulb glows when a coin is connected in a circuit. The coin is therefore acting as a

(A) battery
(B) conductor
(C) switch
(D) insulator

Correct Answer: B

Explanation:

Conductors complete the circuit and allow current flow.

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Question (28)

QN00128

Which material is used inside electric wires to carry current?

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

Correct Answer: C

Explanation:

Copper is widely used for carrying electric current.

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Question (29)

QN00129

Why is plastic unsuitable for carrying electric current in circuits?

(A) It is too shiny
(B) It is an insulator
(C) It becomes magnetic
(D) It glows automatically

Correct Answer: B

Explanation:

Plastic blocks electric current.

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Question (30)

QN00130

Which of the following would be best for making the conducting part of a circuit tester?

(A) Rubber strip
(B) Wooden ruler
(C) Copper wire
(D) Plastic sheet

Correct Answer: C

Explanation:

Copper wire conducts electricity effectively.

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Question (21)

Which statement correctly defines an electrical insulator?

Explanation:

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Question (22)

Which material among the following is both a metal and a good conductor?

Explanation:

Link:

Question (23)

Why is rubber used in electrical gloves?

Explanation:

Link:

Question (24)

A student tests a graphite pencil lead in a circuit and finds that the bulb glows dimly. This suggests that graphite is

Explanation:

Link:

Question (25)

Which material is safest for covering electrical wires in homes?

Explanation:

Link:

Question (26)

Which of the following is most likely to conduct electricity?

Explanation:

Link:

Question (27)

A student observes that a bulb glows when a coin is connected in a circuit. The coin is therefore acting as a

Explanation:

Link:

Question (28)

Which material is used inside electric wires to carry current?

Explanation:

Link:

Question (29)

Why is plastic unsuitable for carrying electric current in circuits?

Explanation:

Link:

Question (30)

Which of the following would be best for making the conducting part of a circuit tester?

Explanation:

Link:

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