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Question (1)

QN0028896

A student connects a compass near a straight wire carrying electric current. The compass needle deflects. Which conclusion is correct?

(A) Electric current produces magnetic effect
(B) The wire becomes permanently magnetic
(C) Compass stops working near metals
(D) Current produces sound energy only

Correct Answer: A

Explanation:

A current carrying wire produces a magnetic field around it.

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Question (2)

QN0028897

An electromagnet made using 30 turns of wire lifts 5 paper clips. If the number of turns is increased to 60 using the same battery, the electromagnet will most likely

(A) attract fewer clips
(B) attract more clips
(C) stop behaving as magnet
(D) become a permanent magnet

Correct Answer: B

Explanation:

Increasing the number of turns strengthens the electromagnet.

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Question (3)

QN0028898

A student connects three identical cells in series to a bulb. Compared to one cell, the bulb glows brighter because

(A) the resistance disappears
(B) the bulb size increases
(C) more electrical energy is supplied
(D) the filament becomes thicker

Correct Answer: C

Explanation:

More cells in series provide greater electrical energy.

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Question (4)

QN0028899

A thin nichrome wire and a thick nichrome wire of equal length are connected separately to the same source. Which wire becomes hotter?

(A) Thick wire
(B) Thin wire
(C) Both equally
(D) Neither wire heats

Correct Answer: B

Explanation:

Thin wire offers greater resistance and produces more heat.

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Question (5)

QN0028900

Why is nichrome commonly used in heating appliances?

(A) It is a poor conductor
(B) It has high resistance and withstands heat
(C) It becomes magnetic easily
(D) It melts quickly

Correct Answer: B

Explanation:

Nichrome produces more heat and tolerates high temperature.

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Question (6)

QN0028901

A crane in a scrap yard drops iron pieces immediately after the current is switched OFF because

(A) the iron melts instantly
(B) the electromagnet loses magnetism
(C) the crane becomes insulated
(D) resistance becomes zero

Correct Answer: B

Explanation:

Electromagnets work only when current flows.

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Question (7)

QN0028902

A lemon cell fails to glow an LED when plain water is used instead of lemon juice because plain water

(A) acts as strong electrolyte
(B) is a weak conductor
(C) increases resistance greatly
(D) changes LED polarity

Correct Answer: B

Explanation:

Lemon juice acts as electrolyte, while plain water conducts poorly.

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Question (8)

QN0028903

A student reverses the battery terminals connected to an electromagnet. What change occurs?

(A) Size of magnet increases
(B) Heat production stops
(C) Magnetic poles reverse
(D) Wire becomes insulator

Correct Answer: C

Explanation:

Reversing current direction reverses magnetic poles.

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Question (9)

QN0028904

An electric iron stops heating even though current is available in the socket. The most likely reason is

(A) broken heating element
(B) stronger magnetic field
(C) electrolyte leakage
(D) compass interference

Correct Answer: A

Explanation:

Heating appliances stop working if the heating element breaks.

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Question (10)

QN0028905

A student uses two identical bulbs. One is connected to a single cell and the other to two cells in series. Which bulb glows brighter?

(A) Bulb with one cell
(B) Bulb with two cells
(C) Both equally
(D) Neither bulb glows

Correct Answer: B

Explanation:

Two cells supply greater electrical energy.

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Question (1)

A student connects a compass near a straight wire carrying electric current. The compass needle deflects. Which conclusion is correct?

Explanation:

Link:

Question (2)

An electromagnet made using 30 turns of wire lifts 5 paper clips. If the number of turns is increased to 60 using the same battery, the electromagnet will most likely

Explanation:

Link:

Question (3)

A student connects three identical cells in series to a bulb. Compared to one cell, the bulb glows brighter because

Explanation:

Link:

Question (4)

A thin nichrome wire and a thick nichrome wire of equal length are connected separately to the same source. Which wire becomes hotter?

Explanation:

Link:

Question (5)

Why is nichrome commonly used in heating appliances?

Explanation:

Link:

Question (6)

A crane in a scrap yard drops iron pieces immediately after the current is switched OFF because

Explanation:

Link:

Question (7)

A lemon cell fails to glow an LED when plain water is used instead of lemon juice because plain water

Explanation:

Link:

Question (8)

A student reverses the battery terminals connected to an electromagnet. What change occurs?

Explanation:

Link:

Question (9)

An electric iron stops heating even though current is available in the socket. The most likely reason is

Explanation:

Link:

Question (10)

A student uses two identical bulbs. One is connected to a single cell and the other to two cells in series. Which bulb glows brighter?

Explanation:

Link:

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