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. The diagram shows an alarm system.

What happens when battery P is disconnected?

	Iron armature	Bell
A	Falls	Rings
B	Falls	Stops ringing
C	Moves up	Rings
D	Moves up	Stops ringing

D

A

C

B

2. The number of turns between each pair of output terminals of a transformer is shown in the diagram.

Between which two terminals will the output be 12 V?

P and R

R and S

Q and R

P and Q

3. Electrical energy is transmitted at high alternating voltages.

What is not a valid reason for doing this?

For a given power, there is a lower current with a higher voltage.

There is a smaller power loss at higher voltage and lower current.

The transmission lines can be thinner with a lower current.

At high voltage, alternating current is safer than direct current.

4. Which properties make materials suitable for use as a core in an electromagnet?

Easy to magnetise and easy to demagnetise

Easy to magnetise and retains magnetic strength

Difficult to magnetise and easy to demagnetise

Difficult to magnetise and retains magnetic strength

5. A small boy turns the handle of a small A.C. generator four times per second. The generator produces a maximum output voltage of 0.5 V.

Which of the following graphs best describe the situation above?

A

C

B

D

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

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

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

The transmission system does not require transformers.

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

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

Which diagram shows the correct compass direction?

C

A

B

D

8. 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?

Rotating at a slower speed

Increasing the number of turns

Reducing the area of the coil

Using a weaker magnet

9. When one end of an iron rod is placed near a compass, ______________.

it is always the south pole of the compass that points towards it.

the compass needle will not be affected by the iron rod.

it is always the north pole of the compass that points towards it.

any pole of the compass may point towards it.

10. 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 copper with a S-pole at X

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

It could be made of steel but is not permanently magnetised

It could be made of copper but is not permanently magnetised

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