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 wire hangs between the poles of a magnet.

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

C

B

D

A

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

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

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.

3. Which single-coil motor will have the largest turning effect?

	Current In Coil	No. of Turns In Coil	Iron Core
A	6 A	100	No
B	10 A	200	No
C	6 A	100	Yes
D	10 A	200	Yes

C

A

B

D

4. A loops of wire rotates in a magnetic field. Which of the following actions causes an increase in the e.m.f. generated by the coil?

Reducing the area of the coil

Increasing the number of turns

Using a weaker magnet

Rotating at a slower speed

5. A bar magnet is broken into three parts X, Y and Z.

Which diagram shows the poles in X, Y and Z?

A

B

C

D

6. Four plotting compasses are placed near a bar magnet. You may ignore any effects of the Earth's magnetic field. One compass appears like this:

What is a possible position for this compass?

B

C

D

A

7. A piece of electrical equipment is sensitive to magnetic fields and is screened from them. To do this, it is enclosed in a box.

Which material should be used to make the box?

Copper

Plastic

Steel

Iron

8. End X of a metal rod attracts the N-pole of a compass needle.

What does this show about the rod?

It could be made of steel but is not permanently magnetised

It could be made of copper with a S-pole at X

It could be made of copper but is not permanently magnetised

It could be made of steel with a N-pole at X

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

Which diagram shows the correct compass direction?

A

C

D

B

10. Why is a transformer used to connect a generator in a power station to a long distance transmission line?

To increase the voltage and increase the current

To increase the voltage and decrease the current

To decrease the voltage and increase the current

To decrease the voltage and decrease the current

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