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Questions

Question (1)

QN001

Which part of a torchlight produces light when the switch is turned ON?

(A) Electric cell
(B) Switch
(C) Lamp
(D) Wire

Correct Answer: C

Explanation:

The lamp produces light in a torch.

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Question (2)

QN002

In a torchlight, the lamp glows only when the electrical circuit is

(A) broken
(B) open
(C) complete
(D) disconnected

Correct Answer: C

Explanation:

A complete circuit allows current to flow.

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Question (3)

QN003

Which of the following is a portable source of electrical energy?

(A) Electric pole
(B) Electric cell
(C) Ceiling fan
(D) Generator

Correct Answer: B

Explanation:

An electric cell is a portable source of electrical energy.

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Question (4)

QN004

The positive terminal of an electric cell is the

(A) flat metal disc
(B) plastic covering
(C) small protruding metal cap
(D) spring side

Correct Answer: C

Explanation:

The protruding metal cap is the positive terminal.

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Question (5)

QN005

Two cells are connected in a torch. The positive terminal of one cell touches the negative terminal of the other. This combination is called a

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

Correct Answer: B

Explanation:

Two or more connected cells form a battery.

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Question (6)

QN006

A student places two cells in a torch in opposite directions. What is most likely to happen when the switch is pressed?

(A) The torch glows brighter
(B) The torch lamp does not glow
(C) The cells become larger
(D) The switch melts

Correct Answer: B

Explanation:

Wrong placement of cells breaks proper current flow.

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Question (7)

QN007

In an incandescent lamp, the thin wire that glows is called the

(A) connector
(B) electrode
(C) filament
(D) resistor

Correct Answer: C

Explanation:

The filament glows when current passes through it.

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Question (8)

QN008

Which statement about an LED is correct?

(A) It contains a filament
(B) It works in any direction
(C) One wire is longer than the other
(D) Both wires are equal in length

Correct Answer: C

Explanation:

An LED has one longer wire and one shorter wire.

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Question (9)

QN009

In an LED, the longer wire represents the

(A) negative terminal
(B) positive terminal
(C) filament
(D) insulator

Correct Answer: B

Explanation:

The longer wire is the positive terminal.

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Question (10)

QN0010

A student connects the longer wire of an LED to the negative terminal of a battery and the shorter wire to the positive terminal. What will happen?

(A) The LED glows brightly
(B) The LED glows dimly
(C) The LED does not glow
(D) The battery stops working

Correct Answer: C

Explanation:

LED glows only when connected with correct polarity.

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