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Question (11)

QN0041

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

(A) LED glows brightly
(B) LED glows dimly
(C) LED does not glow
(D) Battery becomes dead instantly

Correct Answer: C

Explanation:

LED glows only with correct polarity.

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Question (12)

QN0042

Which arrangement forms a complete electrical circuit?

(A) Only one terminal of lamp connected to cell
(B) Both terminals of lamp connected to same cell terminal
(C) Each lamp terminal connected to different terminals of cell
(D) Lamp not connected to wire

Correct Answer: C

Explanation:

A complete circuit connects both lamp terminals to different cell terminals.

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Question (13)

QN0043

The direction of electric current in a circuit is taken from the

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

Correct Answer: C

Explanation:

Conventional current flows from positive to negative terminal.

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Question (14)

QN0044

A lamp connected properly to a cell still does not glow. Which is the most likely reason?

(A) Filament is broken
(B) Glass bulb is transparent
(C) Wire is metallic
(D) Cell has terminals

Correct Answer: A

Explanation:

A broken filament prevents current flow.

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Question (15)

QN0045

Which material is removed from the ends of electric wires before making a circuit?

(A) Rubber tyre
(B) Plastic covering
(C) Filament
(D) Metal disc

Correct Answer: B

Explanation:

Plastic insulation is removed to expose the metal wire.

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Question (16)

QN0046

A student forgets to remove insulation from the wire ends before connecting them in a circuit. What will happen?

(A) Lamp glows normally
(B) Lamp glows brighter
(C) Lamp does not glow
(D) Switch breaks

Correct Answer: C

Explanation:

Insulation blocks electrical contact.

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Question (17)

QN0047

Which component can either complete or break an electrical circuit?

(A) Battery
(B) Lamp
(C) Switch
(D) Filament

Correct Answer: C

Explanation:

A switch controls the flow of current.

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Question (18)

QN0048

In the OFF position of a switch, the circuit is said to be

(A) closed
(B) fused
(C) open
(D) charged

Correct Answer: C

Explanation:

OFF position creates an open circuit.

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Question (19)

QN0049

A lamp glows when the switch is moved to ON position because the switch

(A) cools the battery
(B) closes the circuit
(C) breaks the filament
(D) removes the wires

Correct Answer: B

Explanation:

ON position completes the circuit.

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Question (20)

QN0050

In a simple switch made using a safety pin, the lamp glows only when the safety pin

(A) hangs freely
(B) touches both drawing pins
(C) is wrapped in plastic
(D) points downward

Correct Answer: B

Explanation:

Touching both drawing pins closes the circuit.

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Question (11)

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

Explanation:

Link:

Question (12)

Which arrangement forms a complete electrical circuit?

Explanation:

Link:

Question (13)

The direction of electric current in a circuit is taken from the

Explanation:

Link:

Question (14)

A lamp connected properly to a cell still does not glow. Which is the most likely reason?

Explanation:

Link:

Question (15)

Which material is removed from the ends of electric wires before making a circuit?

Explanation:

Link:

Question (16)

A student forgets to remove insulation from the wire ends before connecting them in a circuit. What will happen?

Explanation:

Link:

Question (17)

Which component can either complete or break an electrical circuit?

Explanation:

Link:

Question (18)

In the OFF position of a switch, the circuit is said to be

Explanation:

Link:

Question (19)

A lamp glows when the switch is moved to ON position because the switch

Explanation:

Link:

Question (20)

In a simple switch made using a safety pin, the lamp glows only when the safety pin

Explanation:

Link:

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