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Question (11)

QN0011

Electric current in a circuit is taken to flow from the

(A) negative terminal to positive terminal
(B) switch to lamp
(C) positive terminal to negative terminal
(D) filament to battery

Correct Answer: C

Explanation:

Conventional current flows from positive to negative terminal.

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Question (12)

QN0012

A torch lamp does not glow even though the cell is properly connected. One possible reason is that the filament is

(A) thick
(B) wet
(C) broken
(D) shining

Correct Answer: C

Explanation:

A broken filament stops current flow.

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Question (13)

QN0013

A switch in OFF position keeps the lamp from glowing because

(A) the battery becomes weak
(B) the circuit becomes open
(C) the filament melts instantly
(D) the wires become insulators

Correct Answer: B

Explanation:

OFF position creates a gap in the circuit.

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Question (14)

QN0014

A student makes a switch using a safety pin and two drawing pins. The lamp glows only when the safety pin

(A) is removed completely
(B) touches both drawing pins
(C) is painted with plastic
(D) is bent upward

Correct Answer: B

Explanation:

Touching both pins completes the circuit.

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Question (15)

QN0015

In a circuit with an incandescent lamp, the lamp glows when

(A) only one terminal is connected
(B) both lamp terminals are connected to the same cell terminal
(C) each lamp terminal is connected to different terminals of the cell
(D) no wires are used

Correct Answer: C

Explanation:

Current flows only in a complete circuit.

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Question (16)

QN0016

Which arrangement will allow current to pass through an LED?

(A) Positive terminal of battery connected to longer wire of LED
(B) Positive terminal connected to shorter wire of LED
(C) Both LED wires connected together
(D) Only one wire connected to LED

Correct Answer: A

Explanation:

LED glows only with correct terminal connections.

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Question (17)

QN0017

A torch uses four cells connected one after another. Why are multiple cells used?

(A) To reduce the size of the torch
(B) To provide energy for a longer time or more energy
(C) To cool the filament
(D) To stop current flow

Correct Answer: B

Explanation:

More cells provide more energy and longer usage.

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Question (18)

QN0018

Which of the following correctly describes a closed circuit?

(A) It has a gap in the path
(B) It does not allow current flow
(C) It provides a complete path for current flow
(D) It contains no cell

Correct Answer: C

Explanation:

A closed circuit allows electric current to flow.

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Question (19)

QN0019

A student accidentally leaves plastic covering on the ends of connecting wires while making a circuit. What will happen?

(A) The lamp glows normally
(B) The circuit becomes brighter
(C) The lamp does not glow
(D) The switch melts

Correct Answer: C

Explanation:

Plastic covering prevents electrical contact.

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Question (20)

QN0020

Which statement correctly compares incandescent lamps and LEDs?

(A) Both contain filaments
(B) LEDs glow only in one direction of current flow
(C) Incandescent lamps have longer and shorter wires
(D) LEDs work even without a battery

Correct Answer: B

Explanation:

LEDs allow current in only one direction.

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Question (11)

Electric current in a circuit is taken to flow from the

Explanation:

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Question (12)

A torch lamp does not glow even though the cell is properly connected. One possible reason is that the filament is

Explanation:

Link:

Question (13)

A switch in OFF position keeps the lamp from glowing because

Explanation:

Link:

Question (14)

A student makes a switch using a safety pin and two drawing pins. The lamp glows only when the safety pin

Explanation:

Link:

Question (15)

In a circuit with an incandescent lamp, the lamp glows when

Explanation:

Link:

Question (16)

Which arrangement will allow current to pass through an LED?

Explanation:

Link:

Question (17)

A torch uses four cells connected one after another. Why are multiple cells used?

Explanation:

Link:

Question (18)

Which of the following correctly describes a closed circuit?

Explanation:

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Question (19)

A student accidentally leaves plastic covering on the ends of connecting wires while making a circuit. What will happen?

Explanation:

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Question (20)

Which statement correctly compares incandescent lamps and LEDs?

Explanation:

Link:

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