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Question (1)

QN001841

What happens to the magnetic compass needle when electric current starts flowing through a nearby wire?

(A) It melts
(B) It becomes hot
(C) It gets deflected
(D) It stops moving permanently

Correct Answer: C

Explanation:

A current carrying wire produces a magnetic field that deflects the compass needle.

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Question (2)

QN001842

The magnetic effect produced around a wire disappears when

(A) the wire becomes hot
(B) the compass is removed
(C) the current stops flowing
(D) the wire is bent

Correct Answer: C

Explanation:

Magnetic effect exists only while current flows.

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Question (3)

QN001843

A student places a compass below a straight wire connected to a cell. The compass needle deflects only when the switch is ON. This proves that

(A) the wire is magnetic permanently
(B) electric current produces magnetic effect
(C) the compass is defective
(D) electricity produces light only

Correct Answer: B

Explanation:

Deflection of compass shows magnetic effect of electric current.

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Question (4)

QN001844

The region around a magnet or a current carrying wire where magnetic effect can be felt is called

(A) electric circuit
(B) resistance
(C) magnetic field
(D) conductor

Correct Answer: C

Explanation:

The magnetic influence around a magnet or wire is called magnetic field.

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Question (5)

QN001845

Which scientist first discovered the magnetic effect of electric current?

(A) Isaac Newton
(B) Hans Christian Oersted
(C) Galileo Galilei
(D) Michael Faraday

Correct Answer: B

Explanation:

Oersted discovered the magnetic effect of electric current in 1820.

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Question (6)

QN001846

An electromagnet is made by winding wire around an iron nail. When current flows, the nail attracts clips. When current stops, clips fall. This shows that an electromagnet is

(A) always magnetic
(B) temporary magnet
(C) natural magnet
(D) permanent magnet

Correct Answer: B

Explanation:

Electromagnets show magnetism only when current flows.

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Question (7)

QN001847

A coil carrying current behaves like

(A) an insulator
(B) a heating rod
(C) a magnet
(D) a fuse

Correct Answer: C

Explanation:

Current carrying coil produces magnetic effect like a magnet.

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Question (8)

QN001848

Why is an iron core inserted inside an electromagnet?

(A) To reduce wire length
(B) To cool the wire
(C) To make the electromagnet stronger
(D) To stop current flow

Correct Answer: C

Explanation:

Iron core increases the strength of electromagnet.

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Question (9)

QN001849

A student increases the number of turns in a coil from 20 to 60 while keeping the same battery. The electromagnet will become

(A) weaker
(B) stronger
(C) non-magnetic
(D) hotter only

Correct Answer: B

Explanation:

More turns increase magnetic field strength.

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Question (10)

QN001850

Two identical electromagnets are connected separately to one cell and two cells. Which will attract more paper clips?

(A) Electromagnet with one cell
(B) Electromagnet with two cells
(C) Both equally
(D) Neither attracts clips

Correct Answer: B

Explanation:

More cells produce larger current and stronger electromagnet.

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Question (1)

What happens to the magnetic compass needle when electric current starts flowing through a nearby wire?

Explanation:

Link:

Question (2)

The magnetic effect produced around a wire disappears when

Explanation:

Link:

Question (3)

A student places a compass below a straight wire connected to a cell. The compass needle deflects only when the switch is ON. This proves that

Explanation:

Link:

Question (4)

The region around a magnet or a current carrying wire where magnetic effect can be felt is called

Explanation:

Link:

Question (5)

Which scientist first discovered the magnetic effect of electric current?

Explanation:

Link:

Question (6)

An electromagnet is made by winding wire around an iron nail. When current flows, the nail attracts clips. When current stops, clips fall. This shows that an electromagnet is

Explanation:

Link:

Question (7)

A coil carrying current behaves like

Explanation:

Link:

Question (8)

Why is an iron core inserted inside an electromagnet?

Explanation:

Link:

Question (9)

A student increases the number of turns in a coil from 20 to 60 while keeping the same battery. The electromagnet will become

Explanation:

Link:

Question (10)

Two identical electromagnets are connected separately to one cell and two cells. Which will attract more paper clips?

Explanation:

Link:

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