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Electromagnetism
Test Description: 8th grade electromagnetism
Instructions: Answer all questions to get your test result.
1) The region around a magnet in which magnetic forces can act is called the...
A
domain
B
magnetic field
C
solenoid
D
pole
2) An electric fan has an electric motor inside to change...
A
electrical energy into thermal energy
B
kinetic energy into electrical energy
C
electrical energy into kintic energy
D
thermal energy into electrical energy
3) The marked end of a compass needle always points directly to...
A
Earth's geographic North Pole
B
a magnet's north pole
C
a magnet's south pole
D
Earth's geographic South Pole
4) Which of the following is NOT true about an electromagnet?
A
It consists of an iron core and a current-carrying wire
B
The current may be turned on or off
C
Its strength is reduced by adding more loops
D
It can be strong enough to levitate a train
5) All magnets...
A
are surrounded by a magnetic field
B
have two poles
C
exert forces
D
All of the above
6) The magnetic effects of a bar magnet are...
A
None of the above
B
evenly distributed throughout a magnet
C
distributed randomly in a magnet
D
concentrated near the ends
7) Sometimes the magnetic strip on a credit card becomes demagnetized. This strip is most likely a (n)
A
electromagnet
B
permanent magnet
C
temporary magnet
D
geomagnet
8) If you attach a magnet to a string so that the magnet is free to rotate, you will see that one end of the magnet will point...
A
east
B
southwest
C
west
D
north
9) The pole of a magnet that points to the north is called the magnet's...
A
north pole
B
west pole
C
east pole
D
south pole
10) The force of repulsion or attraction between the poles of magnets is called the...
A
Foucault force
B
Coulomb force
C
magnetic force
D
gravitational force
*select an answer for all questions
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