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Question (11)

QN0029703

A student observes outward arrows in the symbol of an electrical component in a circuit diagram. Which component is represented?

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

Correct Answer: C

Explanation:

Arrows indicate light emission from LED.

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Question (12)

QN0029704

Which combination contains only good electrical conductors?

(A) Copper and aluminium
(B) Plastic and rubber
(C) Wood and glass
(D) Chalk and paper

Correct Answer: A

Explanation:

Metals generally conduct electricity well.

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Question (13)

QN0029705

A bulb glows when connected through a steel spoon in a tester circuit. This shows that steel spoon is

(A) an insulator
(B) a conductor
(C) a filament
(D) a battery

Correct Answer: B

Explanation:

Conductors allow electric current to pass.

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Question (14)

QN0029706

In the symbol of an electric cell, the longer line indicates the

(A) switch terminal
(B) negative terminal
(C) positive terminal
(D) filament connection

Correct Answer: C

Explanation:

Standard circuit symbols use a longer line for positive terminal.

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Question (15)

QN0029707

A student connects both terminals of a bulb to the same terminal of a cell. What will happen?

(A) Bulb glows normally
(B) Bulb glows dimly
(C) Bulb does not glow
(D) Bulb bursts immediately

Correct Answer: C

Explanation:

Current cannot flow in such a connection.

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Question (16)

QN0029708

Which of the following objects is safest to touch while working near electric circuits?

(A) Bare copper wire
(B) Steel ruler
(C) Plastic handle
(D) Iron rod

Correct Answer: C

Explanation:

Plastic handle prevents electric shocks.

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Question (17)

QN0029709

Why are standard symbols used in circuit diagrams?

(A) To increase electricity generation
(B) To decorate circuit drawings
(C) To ensure uniform understanding everywhere
(D) To reduce battery size

Correct Answer: C

Explanation:

Standard symbols are universally recognised.

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Question (18)

QN0029710

A student removes the plastic coating from both ends of a connecting wire before making a circuit. Why is this necessary?

(A) To make the wire colourful
(B) To expose the conducting metal
(C) To increase insulation
(D) To reduce current completely

Correct Answer: B

Explanation:

Exposed metal allows proper electrical contact.

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Question (19)

QN0029711

Which of the following materials is least suitable for carrying electric current?

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

Correct Answer: C

Explanation:

Rubber is an electrical insulator.

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Question (20)

QN0029712

A student connects a correctly oriented LED, a switch, wires and a cell. The LED glows only when the switch is ON because the switch

(A) changes the LED colour
(B) closes the circuit path
(C) increases battery voltage
(D) converts conductor into insulator

Correct Answer: B

Explanation:

Current flows only when the circuit is complete.

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Question (11)

A student observes outward arrows in the symbol of an electrical component in a circuit diagram. Which component is represented?

Explanation:

Link:

Question (12)

Which combination contains only good electrical conductors?

Explanation:

Link:

Question (13)

A bulb glows when connected through a steel spoon in a tester circuit. This shows that steel spoon is

Explanation:

Link:

Question (14)

In the symbol of an electric cell, the longer line indicates the

Explanation:

Link:

Question (15)

A student connects both terminals of a bulb to the same terminal of a cell. What will happen?

Explanation:

Link:

Question (16)

Which of the following objects is safest to touch while working near electric circuits?

Explanation:

Link:

Question (17)

Why are standard symbols used in circuit diagrams?

Explanation:

Link:

Question (18)

A student removes the plastic coating from both ends of a connecting wire before making a circuit. Why is this necessary?

Explanation:

Link:

Question (19)

Which of the following materials is least suitable for carrying electric current?

Explanation:

Link:

Question (20)

A student connects a correctly oriented LED, a switch, wires and a cell. The LED glows only when the switch is ON because the switch

Explanation:

Link:

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