KS3 - Ks3 Science - Electromagnets 01 Solution - MCQGeeks.com

Q.1.

Which of the following is a difference between an electromagnet and a permanent bar magnet?

33%
Electromagnets are stronger
67%
Electromagnets can be turned off
0%
Permanent magnets are stronger
0%
Permanent magnets can be turned off

Q.2.

Which of the following uses an electromagnetic effect?

0%
Iron
0%
Light bulb
0%
Toaster
100%
Washing machine

Q.3.

If the current in the wire increases, what happens to the strength of the magnetic field?

0%
It decreases
100%
It increases
0%
It stops the magnetic field
0%
No change

Q.4.

A relay is used in:

50%
A car ignition
0%
An electric bell
50%
An electric cooker
0%
An iron

Q.5.

A relay uses a small current to:

0%
Attract a magnet
0%
Repel a magnet
0%
Switch off a current
100%
Switch on a larger current

Q.6.

Which of the following is NOT true about the magnetic field around a coil of wire carrying a current?

50%
Changing the direction of the current will reverse the poles
0%
Increasing the number of coils will increase the strength
50%
Making the coil wider will increase the strength
0%
Putting an iron core into the coil will increase the strength

Q.7.

The magnetic field around a straight wire carrying an electric current has:

100%
A circular shape
0%
A diamond shape
0%
A square shape
0%
An oval shape

Q.8.

The magnetic field around a coil of wire carrying current:

0%
Is a circular shape
50%
Is a diamond shape
0%
Is a square shape
50%
Is the same shape as around a bar magnet

Q.9.

If the current direction through the wire is reversed, the direction of the magnetic field:

67%
Is also reversed
33%
Stays in the same direction
0%
The current stops flowing
0%
There is no magnetic field

Q.10.

An electromagnet on a crane is used in a scrapyard because:

100%
It can be turned on and off
0%
It can't be turned on and off
0%
It is stronger than a permanent magnet
0%
It is weaker than a permanent magnet