Download Name___________________________________ February 15

Name___________________________________
February 15, 2013
Electricity and Magnetism Unit Test
1. Which of the following materials will a magnet
attract?
a) copper
b) rubber
c) iron
d) plastic
2.
3.
4.
Which statement is TRUE?
a) All magnets have the same shape and size.
b) All magnets have a north and a south pole.
c) All magnets can attract large objects.
d) Magnets cannot pull through solids.
The south pole of a bar magnet will repel
a) a copper nail
b) the north end of another magnet
c) the south end of another magnet
d) an iron nail
Look at the drawing below.
S
N
N
Which of these is a way to make an
electromagnet stronger?
a) increasing the electric current flowing
through the wire
b) replacing the iron core with a copper core
c) replacing the copper wire with plastic wire
d) wrapping the wire around the iron core a
few more times
7. Which material DOES NOT allow electric current
to flow through it?
a) an insulator
b) a magnet
c) a conductor
d) a metal
8.
Electric current DOES NOT flow in
a) an open circuit.
b) a closed circuit.
c) an electromagnet.
d) a complete circuit.
S
If you tried to move these two magnets closer
together, what would you feel?
a)
b)
c)
d)
6.
a push
a pull
no force
a shock
5. Which material is a conductor?
a) wood
b) glass
c) rubber
d) aluminum
9. Which part of a circuit starts and stops the flow
of electric current?
a) battery
b) lightbulb
c) wire
d) switch
10. Which of these is NOT a permanent magnet?
a) electromagnet
b) refrigerator magnet
c) bar magnet
d) horseshoe magnet
Name___________________________________
February 15, 2013
Electricity and Magnetism Unit Test
11. In order to work, an electromagnet must be part
of
a) an electric crane.
b) an electric circuit.
c) an open circuit.
d) a battery.
15. Which of these can supply current to an
electrical circuit?
a) wire
b) a battery
c) a switch
d) a lightbulb
12. A student has four items – an iron bar, a
lightbulb, a battery, and a wire. Which three
items will the student use to make an
electromagnet?
a) iron bar, lightbulb, battery
b) battery, lightbulb, wire
c) battery, iron bar, wire
d) iron bar, lightbulb, wire
16. In which part of a circuit is electrical energy
change into other forms of energy?
a) in the battery
b) in the switch
c) in the wire
d) in the load
13. Which of these materials is an insulator?
a) glass
b) aluminum
c) copper
d) steel
14. Look at the diagram below.
Which object could replace the switch and still allow
the bulb to light up?
a) a rubber band
b) a strip of cloth
c) a steel paper clip
d) a wooden toothpick
17. A girl rubs a balloon against her hair. The
balloon then has a negative charge. The girl’s
hair
a) was uncharged before but now has a
positive charge.
b) was uncharged before but now has a
negative charge.
c) had a positive charge before but now is
uncharged.
d) had a negative charge before but now is
uncharged.
18. Which of these is caused by static electricity?
a) A magnet attracts a paper clip.
b) Glue holds two pieces of paper together.
c) Socks taken from the clothes dryer stick
together.
d) Ice sticks to a car’s windshield on a cold
winter day.
Name___________________________________
February 15, 2013
Electricity and Magnetism Unit Test
19. One of the advantages of an electromagnet over
a bar magnet is that an electromagnet
a) can easily be turned on and off.
b) can be moved from place to place.
c) has no magnetic field.
d) has a north pole and a south pole.
20. Why is wire covered with plastic when making
an electrical circuit?
a) Both the wire and plastic are insulators.
b) Both the wire and plastic are conductors.
c) The wire is an insulator, and the plastic is a
conductor.
d) The wire is a conductor, and the plastic is an
insulator.
21. What part of an electric circuit changes chemical
energy into electric energy?
a) battery
b) lightbulb
c) magnet
d) wire
22. Why does a rubber balloon stick to a wall after
you rub it with wool?
a) Unlike charges repel.
b) Unlike charges attract.
c) Negative charges repel.
d) Positive charges attract.
23. A simple circuit has a battery and a wire. Which
safety hazard if you leave the battery attached for
more than a short period of time?
a) The bulb burns out.
b) The charge stops flowing.
c) The wires get very hot.
d) The battery stops working.
24. Julian is writing instructions of how to
demonstrate static electricity. Which statement
tells how to produce a static charge on a rubber
balloon?
a) Stick the balloon to a wall.
b) Touch the balloon to a magnet.
c) Blow up the balloon.
d) Rub the balloon with a wool cloth.
25. Both balloons in the picture below have more
positive charges that negative charges. What
will happen if the balloons are brought near
each other?
a) The balloons will pull closer to each other.
b) The balloons will push away from each
other.
c) The balloons will not attract or push away
from each other.
d) One balloon will become positively charged
and the other negatively charged.