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Question (11)

QN00111

A student tests four materials using a bulb circuit. The bulb glows for iron and copper but not for plastic and wood. Which statement is correct?

(A) Iron and copper are insulators
(B) Plastic and wood are conductors
(C) Iron and copper are conductors
(D) All four are conductors

Correct Answer: C

Explanation:

Glowing bulb indicates conducting materials.

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Question (12)

QN00112

Why should a person avoid touching bare electric wires?

(A) Conductors can allow electric current to pass through the body
(B) Wires become invisible
(C) Plastic melts instantly
(D) Electricity changes colour

Correct Answer: A

Explanation:

Human body conducts electricity and may receive shock.

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Question (13)

QN00113

Which material is commonly used to make handles of electrical tools?

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

Correct Answer: C

Explanation:

Plastic prevents electric shocks.

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Question (14)

QN00114

Why are handles of screwdrivers and pliers covered with plastic or rubber?

(A) To increase conductivity
(B) To prevent electric shocks
(C) To make them heavier
(D) To produce current

Correct Answer: B

Explanation:

Plastic and rubber are insulators.

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Question (15)

QN00115

Which of the following materials is most suitable for making electric switches safe to touch?

(A) Iron
(B) Steel
(C) Rubber
(D) Copper

Correct Answer: C

Explanation:

Rubber prevents electric current from passing through the body.

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Question (16)

QN00116

A student places an aluminium strip in a simple circuit. The bulb glows brightly. What conclusion can be drawn?

(A) Aluminium is an insulator
(B) Aluminium allows current to pass
(C) Aluminium blocks electric flow
(D) Aluminium is non-metallic

Correct Answer: B

Explanation:

Aluminium is a conductor of electricity.

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Question (17)

QN00117

Which of the following objects would most likely stop current flow in a circuit?

(A) Coin
(B) Iron key
(C) Plastic comb
(D) Steel pin

Correct Answer: C

Explanation:

Plastic comb is an insulator.

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Question (18)

QN00118

Which material is generally NOT used for making connecting wires?

(A) Copper
(B) Aluminium
(C) Silver
(D) Rubber

Correct Answer: D

Explanation:

Rubber is an insulator.

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Question (19)

QN00119

A student accidentally replaces a metal wire in a circuit with a wooden stick. What will happen?

(A) Bulb glows brighter
(B) Bulb glows dimly
(C) Bulb does not glow
(D) Battery becomes stronger

Correct Answer: C

Explanation:

Wood blocks electric current.

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Question (20)

QN00120

Which statement correctly defines an electrical conductor?

(A) A material that blocks current completely
(B) A material that allows electric current to flow through it
(C) A material that produces electricity
(D) A material used only in bulbs

Correct Answer: B

Explanation:

Conductors allow electric current to pass through them.

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Question (11)

A student tests four materials using a bulb circuit. The bulb glows for iron and copper but not for plastic and wood. Which statement is correct?

Explanation:

Link:

Question (12)

Why should a person avoid touching bare electric wires?

Explanation:

Link:

Question (13)

Which material is commonly used to make handles of electrical tools?

Explanation:

Link:

Question (14)

Why are handles of screwdrivers and pliers covered with plastic or rubber?

Explanation:

Link:

Question (15)

Which of the following materials is most suitable for making electric switches safe to touch?

Explanation:

Link:

Question (16)

A student places an aluminium strip in a simple circuit. The bulb glows brightly. What conclusion can be drawn?

Explanation:

Link:

Question (17)

Which of the following objects would most likely stop current flow in a circuit?

Explanation:

Link:

Question (18)

Which material is generally NOT used for making connecting wires?

Explanation:

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Question (19)

A student accidentally replaces a metal wire in a circuit with a wooden stick. What will happen?

Explanation:

Link:

Question (20)

Which statement correctly defines an electrical conductor?

Explanation:

Link:

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