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Elementary School: 3rd, 4th & 5th Grade
Science
Electromagnets
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Q.1
The magnetic field around a coil of wire carrying current .......
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Is a circular shape
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Is a diamond shape
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Is a square shape
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Is the same shape as around a bar magnet
Q.2
What is the difference between an electromagnet and a permanent bar magnet?
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Electromagnets are stronger
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Electromagnets can be turned off
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Permanent magnets are stronger
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Permanent magnets can be turned off
Q.3
The magnetic field around a straight wire carrying an electric current has .......
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A circular shape
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A diamond shape
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A square shape
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An oval shape
Q.4
A relay uses a small current to .......
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Attract a magnet
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Repel a magnet
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Switch off a current
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Switch on a larger current
Q.5
If the current in the wire increases, what happens to the strength of the magnetic field?
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It decreases
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It increases
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It stops the magnetic field
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No change
Q.6
If the current direction through the wire is reversed, the direction of the magnetic field .......
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Is also reversed
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Stays in the same direction
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The current stops flowing
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There is no magnetic field
Q.7
An electromagnet is used in a scrapyard because .......
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It can be turned on and off
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It can't be turned on and off
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It is stronger than a permanent magnet
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It is weaker than a permanent magnet
Q.8
Which of the following is NOT true about the magnetic field around a coil of wire carrying a current?
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Changing the direction of the current will reverse the poles
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Increasing the number of coils will increase the strength
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Making the coil wider will increase the strength
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Putting an iron core into the coil will increase the strength
Q.9
Which of the following uses an electromagnetic effect?
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Iron
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Light bulb
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Toaster
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Washing machine
Q.10
A relay is used in .......
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A car ignition
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An electric bell
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An electric cooker
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An iron
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