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Question (31)

QN00131

A bulb in a tester circuit glows when connected through a metal object. What does this show about the object?

(A) It is an insulator
(B) It is a conductor
(C) It produces electricity
(D) It stores current permanently

Correct Answer: B

Explanation:

Metal objects that allow bulb to glow are conductors.

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Question (32)

QN00132

Which of the following materials is least suitable for making electrical plugs?

(A) Plastic
(B) Bakelite
(C) Rubber
(D) Copper outer covering

Correct Answer: D

Explanation:

Outer covering should be insulating, not conducting.

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Question (33)

QN00133

A student uses a rubber band instead of wire in a circuit. The bulb does not glow because rubber

(A) absorbs electricity
(B) blocks electric current
(C) increases voltage
(D) acts like a battery

Correct Answer: B

Explanation:

Rubber is an insulator.

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Question (34)

QN00134

Which property makes metals useful in electrical appliances?

(A) They are poor conductors
(B) They conduct electricity effectively
(C) They dissolve in water
(D) They stop current flow completely

Correct Answer: B

Explanation:

Metals conduct electricity effectively.

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Question (35)

QN00135

Which of the following household items is most likely made of insulating material for safety?

(A) Electric wire core
(B) Spoon
(C) Plug top cover
(D) Aluminium foil

Correct Answer: C

Explanation:

Plug covers are made of insulating materials.

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Question (36)

QN00136

A student finds that the bulb glows with a coin but not with a chalk piece in a tester circuit. This shows that chalk is

(A) a conductor
(B) an insulator
(C) metallic
(D) electrically charged

Correct Answer: B

Explanation:

Chalk does not conduct electricity.

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Question (37)

QN00137

Which material would be best for making the tip of a tester used to check circuits?

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

Correct Answer: C

Explanation:

Copper is a good conductor.

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Question (38)

QN00138

Which statement best explains why electric wires have metal inside and plastic outside?

(A) Metal decorates the wire and plastic stores current
(B) Metal conducts electricity while plastic prevents shocks
(C) Plastic conducts current better than metal
(D) Both layers conduct electricity equally

Correct Answer: B

Explanation:

Metal carries current and plastic provides insulation.

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Question (39)

QN00139

Which of the following objects can complete a circuit successfully?

(A) Rubber eraser
(B) Wooden stick
(C) Aluminium foil
(D) Plastic scale

Correct Answer: C

Explanation:

Aluminium foil conducts electricity.

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Question (40)

QN00140

A student connects different materials one by one in a tester circuit. The bulb glows only with metal objects. What conclusion can be drawn?

(A) All metals are insulators
(B) Metals generally conduct electricity
(C) Only plastic conducts electricity
(D) Wood is a good conductor

Correct Answer: B

Explanation:

Metals are generally good conductors of electricity.

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Question (31)

A bulb in a tester circuit glows when connected through a metal object. What does this show about the object?

Explanation:

Link:

Question (32)

Which of the following materials is least suitable for making electrical plugs?

Explanation:

Link:

Question (33)

A student uses a rubber band instead of wire in a circuit. The bulb does not glow because rubber

Explanation:

Link:

Question (34)

Which property makes metals useful in electrical appliances?

Explanation:

Link:

Question (35)

Which of the following household items is most likely made of insulating material for safety?

Explanation:

Link:

Question (36)

A student finds that the bulb glows with a coin but not with a chalk piece in a tester circuit. This shows that chalk is

Explanation:

Link:

Question (37)

Which material would be best for making the tip of a tester used to check circuits?

Explanation:

Link:

Question (38)

Which statement best explains why electric wires have metal inside and plastic outside?

Explanation:

Link:

Question (39)

Which of the following objects can complete a circuit successfully?

Explanation:

Link:

Question (40)

A student connects different materials one by one in a tester circuit. The bulb glows only with metal objects. What conclusion can be drawn?

Explanation:

Link:

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