8J Magnets and Electromagnets
Year 8
Pretest
QUICK QUIZ
1. Which pair of materials are both
magnetic materials?
1.
2.
3.
4.
silver and gold
iron and plastic
copper and steel
iron and steel
89%
11%
0%
1
0%
2
3
4
2. Which statement is not true about
magnetic materials?
1. They can be made into magnets.
2. They are repelled by magnets.61%
3. They are used in the magnets people put on
fridge doors.
4. They are attracted to magnets.
17%
17%
6%
1
2
3
4
3. Which materials will block magnetism?
1.
2.
3.
4.
iron, steel and nickel
iron, steel and copper
copper, nickel and iron
aluminium and copper
94%
0%
1
6%
2
0%
3
4
4. Which statement is not true?
1.
2.
3.
4.
A north pole attracts a south pole.
A south pole repels a south pole.
A south pole repels a north pole.
A north pole repels a north pole.
50%
28%
11%
1
2
11%
3
4
5. The two ends of a magnet are called:
1.
2.
3.
4.
north and east.
east and west.
south and north.
south and west.
94%
6%
1
0%
2
0%
3
4
1.
2.
3.
4.
6. Compass needles are made from
magnets. One end of the needle
always points:
north.
100%
east.
in the direction you set it to.
towards London.
0%
1
2
0%
3
0%
4
7. Magnetic compasses are used for:
1. drawing circles.
94%
2. telling the time using the Sun.
3. allowing people to find the direction they want to
go in.
4. telling people how long a journey will take.
6%
1
0%
2
0%
3
4
8. You can make a compass by:
1.
2.
3.
4.
hanging a magnet on a thread.
42%
hanging a needle on a thread.
sticking a magnet onto a cork.
sticking a needle onto a cork.
42%
16%
0%
1
2
3
4
9. A magnetic field is:
1. a piece of ground with lots of iron in it.
78%
2. the space around a magnet where it can attract magnetic
materials.
3. the space around a magnet where it can attract all metals.
4. the space around a magnet where it repels magnetic
materials.
17%
6%
0%
1
2
3
4
10. Which diagram shows the shape of
the magnetic field of a bar magnet?
1.
2.
3.
4.
A
B
C
D
39%
28%
28%
6%
1
2
3
4
Participant Scores
8
Zoe Benton
8
8
8
7
Molly Haley
Gianluca Guglielmucci
Sarrah Turner
Emma Weeks
11. The direction of a magnetic field is
from:
1.
2.
3.
4.
south to north.
north to south.
west to east.
east to west.
72%
22%
0%
1
2
3
6%
4
12. The north magnetic pole is:
1.
2.
3.
4.
near the north pole.
near the south pole.
at the north pole.
at the south pole.
39%
22%
22%
17%
1
2
3
4
13. Which statement about
electromagnets is not true?
1.
2.
3.
4.
They can be switched on and off. 50%
They are always magnetic.
They are made from coils of wire.
They need electricity to make them magnetic.
22%
22%
6%
1
2
3
4
14. Which of these changes will make
an electromagnet stronger?
1.
2.
3.
4.
Use more coils of wire. 50%
Use a smaller current.
Use a wooden core.
Use fewer coils of wire.
39%
6%
1
2
6%
3
4
15. This diagram shows part of the circuit for an
electric bell. When the switch is pressed, which
statement is true?
1.
2.
3.
4.
The electromagnet will repel the armature.
The electromagnet will attract the armature.
71%
There is no current flowing in the circuit.
The electromagnet will light up.
18%
12%
0%
1
2
3
4
16. A relay is used in a car starter
motor circuit so that:
1. the driver only touches the high current part of the circuit.
2. there are longer wires between the starter
53%motor and the
battery.
3. the car cannot be stolen.
4. the driver only touches the low current part of the circuit.
35%
12%
0%
1
2
3
4
17. A magnetic field around a wire is
caused by:
1.
2.
3.
4.
the plastic coating on the wire.
47%
the coils of wire.
41%
an iron core inside the wire.
an electric current flowing through the wire.
12%
0%
1
2
3
4
18. The shape of the magnetic field
around an electromagnet is:
1. like the shape of the field around a bar
53%
magnet.
2. like the shape of a Christmas tree.
3. straight.
4. square.
29%
12%
6%
1
2
3
4
19. An iron core will make an
electromagnet stronger because:
1. iron is a strong metal.
2. iron is a magnetic material and concentrates
82% the magnetic
field.
3. the coils of wire can be closer together if there is a core.
4. the core keeps the coils lined up properly.
18%
0%
1
2
3
0%
4
20. The magnetic field around a
straight piece of wire is:
1.
2.
3.
4.
parallel to the wire.
square.
circular.
a spiral.
47%
24%
18%
12%
1
2
3
4
Participant Scores
18
Zoe Benton
14
14
14
13
Sarrah Turner
Molly Haley
Millie Cornwell
William Bickley