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Question (21)

QN0051

Which of the following correctly describes a closed circuit?

(A) Current cannot flow
(B) A gap exists in the path
(C) Current flows through a complete path
(D) No battery is used

Correct Answer: C

Explanation:

A closed circuit provides a complete path for current.

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Question (22)

QN0052

A torch contains four cells arranged properly. If one cell is reversed accidentally, the torch will most likely

(A) glow brighter
(B) not glow
(C) produce sound
(D) melt instantly

Correct Answer: B

Explanation:

Reversing a cell disturbs proper current flow.

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Question (23)

QN0053

Why does an incandescent lamp glow even if its two terminals are interchanged with the cell terminals?

(A) It has no filament
(B) Current flows in any direction through the filament
(C) It contains two switches
(D) The battery changes polarity automatically

Correct Answer: B

Explanation:

Filament lamps work in either direction of current flow.

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Question (24)

QN0054

Which statement is true for an LED lamp?

(A) It glows in every connection
(B) It has only one terminal
(C) Correct polarity is necessary for glowing
(D) It contains a thick filament

Correct Answer: C

Explanation:

LEDs glow only with correct terminal connections.

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Question (25)

QN0055

A student connects the longer wire of an LED to the positive terminal of a battery and the shorter wire to the negative terminal. The LED glows because

(A) current flows in the correct direction
(B) the filament melts
(C) the switch is absent
(D) both wires are equal

Correct Answer: A

Explanation:

Correct polarity allows current to pass through the LED.

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Question (26)

QN0056

Which part of the incandescent lamp supports the filament?

(A) Plastic coating
(B) Thick wires
(C) Glass bulb only
(D) Battery holder

Correct Answer: B

Explanation:

Thick wires hold the filament in place.

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Question (27)

QN0057

The filament inside an incandescent lamp is fixed inside the

(A) switch
(B) cardboard
(C) glass bulb
(D) spring holder

Correct Answer: C

Explanation:

The filament is enclosed in the glass bulb.

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Question (28)

QN0058

A battery made using three cells connected in series will have

(A) three positive terminals only
(B) three negative terminals only
(C) one free positive and one free negative terminal
(D) no terminals

Correct Answer: C

Explanation:

A battery has one positive and one negative free terminal.

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Question (29)

QN0059

What is the main purpose of using wires in an electrical circuit?

(A) To decorate the circuit
(B) To provide a path for current flow
(C) To increase bulb size
(D) To block electricity

Correct Answer: B

Explanation:

Wires carry electric current through the circuit.

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Question (30)

QN0060

Which of the following would prevent current flow in a simple circuit?

(A) Complete path
(B) Properly connected cell
(C) Open switch
(D) Metallic wires

Correct Answer: C

Explanation:

An open switch breaks the circuit.

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Question (21)

Which of the following correctly describes a closed circuit?

Explanation:

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Question (22)

A torch contains four cells arranged properly. If one cell is reversed accidentally, the torch will most likely

Explanation:

Link:

Question (23)

Why does an incandescent lamp glow even if its two terminals are interchanged with the cell terminals?

Explanation:

Link:

Question (24)

Which statement is true for an LED lamp?

Explanation:

Link:

Question (25)

A student connects the longer wire of an LED to the positive terminal of a battery and the shorter wire to the negative terminal. The LED glows because

Explanation:

Link:

Question (26)

Which part of the incandescent lamp supports the filament?

Explanation:

Link:

Question (27)

The filament inside an incandescent lamp is fixed inside the

Explanation:

Link:

Question (28)

A battery made using three cells connected in series will have

Explanation:

Link:

Question (29)

What is the main purpose of using wires in an electrical circuit?

Explanation:

Link:

Question (30)

Which of the following would prevent current flow in a simple circuit?

Explanation:

Link:

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