Practice MCQs For Magnetism & Electromagnetism

This quiz contains practice questions for GCE ‘O’ level topic: Magnetism & Electromagnetism. There are explanations for some of the questions after you submit the quiz. If you could not figure out why a particular option is the answer, feel free to drop a comment below or ask a question in ‘O’ & ‘A’ Level Discussion section of the forum. If you wish to contribute questions to this quiz, please contact us.

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1. A metal bar PQ hangs from a thin thread and always comes to rest with end P pointing north. Another bar XY of the same metal settles in no definite direction.

What happens if the two bars are brought near one another?

End P attracts end X but repels end Y

End P repels end X but attracts end Y

End P neither attracts nor repels end X

End P and end Q both attract end X

2. A magnet is placed close to an iron bar.

The iron bar becomes an induced magnet.

Which magnetic poles are formed at the ends X and Y of the bar?

	End X	End Y
A	N	N
B	N	S
C	S	N
D	S	S

B

A

C

D

3. Which statement about the action of a transformer is correct?

An e.m.f. is induced in the secondary coil when there is a steady direct current in the primary coil.

An e.m.f. is induced in the secondary coil when an alternating voltage is applied to the primary coil.

The current in the secondary coil is always larger than the current in the primary coil.

The voltage in the secondary coil is always larger than the voltage in the primary coil.

4. Which of the following will prove that a metal bar is a permanent magnet?

It attracts another magnet

It repels another magnet

It conducts electricity

It attracts both ends of a compass needle

5. One end of a rod picks up the N-pole of a bar magnet when in position 1.

The same end of the rod picks up the S-pole of the bar magnet when in position 2.

Which material is the rod made from and what is the pole at end P of the rod when in position 1?

A

B

D

C

6. A wire hangs between the poles of a magnet.

When there is a current in the wire, in which direction does the wire move?

C

D

B

A

7. The diagrams show a small compass close to a strong bar magnet.

Which diagram shows the correct compass direction?

A

B

D

C

8. Which statement about the action of a transformer is correct?

An e.m.f. is induced in the secondary coil when an alternating voltage is applied to the primary coil.

An alternating current always flows in the secondary coil when an alternating voltage is applied to the primary coil.

An e.m.f. is induced in the secondary coil when a steady direct current flows in the primary coil.

The current in the secondary coil is always larger than the current in the primary coil.

9. Why is electrical energy usually transmitted at high voltage?

The transmission system does not require transformers.

The resistance of the transmission cables is as small as possible.

The current in the transmission cables is as large as possible.

As little energy as possible is wasted in the transmission cables.

10. What is a suitable metal for the core of an electromagnet?

Steel

Iron

Aluminium

Copper

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