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

It conducts electricity

It attracts both ends of a compass needle

It attracts another magnet

It repels another magnet

2. The diagram shows parts of a loudspeaker.

Which type of current is passed through the coil and why?

	Current passed through coil	Reason why
A	Alternating	To keep the magnetic field constant
B	Alternating	To make the coil vibrate
C	Direct	To keep the magnetic field constant
D	Direct	To make the coil vibrate

C

D

B

A

3. The diagram shows the magnetic field pattern of a current in a solenoid.

When the current in the solenoid is increased, where is there an increase in the magnetic field strength?

K, L and M

M only

K and L only

M and L only

4. The diagram shows part of a magnetic relay. M is part of the core of the magnet. L is part of the armature which is attracted to the core when a current flows through the coil. S is a stud which stops the armature being attracted too strongly.

Which line of the table gives the best materials for M, L and S?

	M	L	S
A	Iron	Iron	Iron
B	Iron	Iron	Copper
C	Iron	Copper	Copper
D	Copper	Copper	Copper

D

C

A

B

5. A simple D.C. motor consists of a coil that rotates between the poles of a permanent magnet. The turning effect is increased by winding the coil on a metal cylinder.

Which metal are used to make the magnet and the cylinder?

	Magnet	Cylinder
A	iron	copper
B	iron	steel
C	steel	copper
D	steel	iron

D

B

A

C

6. 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

D

B

C

A

7. The diagram shows a brass rod and an iron rod beside each other at the bottom of a rectangular coil.

What happens when a d.c. current passes through the coil?

The two rods repel each other

Only the iron rod is magnetised

Only the brass rod is magnetised

The two rods attract each other

8. Electrical energy is transmitted at high alternating voltages.

What is not a valid reason for doing this?

The transmission lines can be thinner with a lower current.

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

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

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

9. The diagram shows the shape of the magnetic field lines near a current-carrying conductor.

The current in the conductor is into the plane of the diagram.

Which row correctly states the direction of the field lines and compares the strengths of the field at points P and Q?

	Direction of field lines	The field is stronger at
A	Clockwise	P
B	Clockwise	Q
C	Anticlockwise	P
D	Anticlockwise	Q

D

A

C

B

10. Which of the following is NOT suitable for use as a transformer core?

Steel

Nickel

All of the options can be used as a transformer core

Iron

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