OARS Test for Lesson 4: 4th Grade Science:
"To Attract or Not to Attract": Electromagnets
Lesson 4 grade 4
(Test ID: ins702699)
Created with INSPECT® and the Online Assessment Reporting System (OARS)
For Authorized Use Only
1. In making a simple electromagnet, __________ are used to produce magnetic
fields.
A
static electric charges
C
silk filaments
B
inclined planes
D
electric currents
2. Which of the following best describes what is shown in the diagram below?
A
a compass
B
a magnet
C
an electromagnet
D a battery
3. An electromagnet is called a _____________ because it can be turned on and off
by opening and closing an electric circuit.
A temporary magnet
B permanent magnet
C compass
D battery
4. What is one way to make an electromagnet stronger?
A Turn off the electric current.
B
Take away some of the coils.
C
Add more electrical current.
D
The strength of an electromagnet cannot be changed.
5. The metal center of an electromagnet is called the __________.
A
coil
B
wire
C
core
D
current
6. Which of the following is NOT necessary to make an electromagnet?
A
an electric current
B
a wire
C
a metal core
D
insulation
7. A simple electromagnet is constructed by wrapping an insulated wire around an
iron core and connecting the two ends of the wire to a battery. If the number of
coils in the wire wrapped around the iron core are decreased, then there will be a(n)
A
decrease in magnetic strength.
C
loss of all magnetic strength.
B
increase in magnetic strength.
D
reverse in the direction of the poles.
8. If the amount of electricity flowing through the insulated wire in an
electromagnet is decreased, then there will be a(n)
A increase in the magnetic strength of the electromagnet.
B
decrease in the magnetic strength of the electromagnet.
C
reverse in the direction of the poles of the electromagnet.
D
loss of all magnetic strength in the electromagnet.
9. An electromagnet that is made with two batteries will have
A weaker magnetic strength than an electromagnet with one battery.
B
the same magnetic strength as an electromagnet with one battery.
C
greater magnetic strength than an electromagnet with one battery.
D
a different pole direction than an electromagnet with one battery.
10. Two different electromagnets are constructed. One electromagnet has a soft
iron core and one has a nickel core. The electromagnet with the nickel core will
have
A
the same magnetic strength.
C
greater magnetic strength.
B
a different pole direction.
D
weaker magnetic strength.
11. Which of the following would increase the strength of an electromagnet?
A increase the number of coils wrapped around the core
B
use a nickel core rather than an iron core
C
reverse the direction of the electromagnetic poles
D
decrease the number of coils wrapped around the core
12. Which of the following affects the strength of an electromagnet?
A the material the core is made of
B
the number of batteries used
C
the number of coils wrapped around the core
D
All of the above
13. Ana made an electromagnet by wrapping a pencil with wire and attaching both
ends of the wire to a 9–volt battery. Which of the following changes will INCREASE
the strength of her electromagnet?
A replacing the wire with string
B
replacing the pencil with an iron nail
C
replacing the battery with a lower voltage battery
D
decreasing the number of coils wrapped around the pencil
14. Adrian's electromagnet has the characteristics listed in the table above. Which
of the following changes would make his electromagnet WEAKER?
A replacing the air core with an iron core
B
increasing the number of coils to 25
C
increasing the amount of electricity running through the copper wire
D
replacing the two 9–volt batteries with a 1.5 volt battery
15. Logan and Seth both constructed an electromagnet. The table above shows the
materials used in each. Which statement BEST compares the two magnets?
A Logan's electromagnet is stronger than Seth's.
B
Seth's electromagnet is stronger than Logan's.
C
Both electromagnets have the same magnetic strength.
D
Neither electromagnet will work because copper wire does not conduct electricity.
16. Which of the following produces a magnetic field?
A
heat moving through a wire
C
electricity moving through a wire
B
heat moving through any metal
D
None of the above
17. What will happen to a paper clip lying next to an electrically charged wire?
A
it will heat up quickly
C
it will be repelled by the wire
B
it will be attracted to the wire
D
nothing will happen to the paper clip
18. Allie places some iron filings next to a wire. She notices that the wire attracts
the iron filings. Based on her observations, what can Allie infer?
A electricity is running through the wire
B
heat is running through the wire
C
water is running through the wire
D
iron filings are always attracted to wires
19. Which of the following BEST describes the relationship between magnetism and
electricity in an electromagnet?
A electric currents prevent magnetic fields from forming
B
magnets convert magnetic energy into electrical energy
C
magnetic fields are created by the flow of electric currents
D
electricity makes magnets attract nonmetals they normally cannot
20. A simple electromagnet can be made by wrapping metal wire around a nail, and
attaching the ends of the wire to an electrical source. When the electrical source is
turned on, the nail will
A repel substances that normally respond to magnets.
B
reverse the flow of the electric current.
C
complete the circuit and cause the light bulb to light.
D
attract substances that respond to magnets.
21. Electromagnets are used in many electric motors, generators, and simple
devices. Electromagnets are much more useful than permanent magnets because
unlike permanent magnets, electromagnets __________.
A
come in a variety of sizes
C
have two magnetic poles
B
have an attractive force
D
can be turned on or off