1. Magnets exert force on which of the following objects?
A. Wood
B. Plastic
C. Iron
D. Water

2. __________ attract one another.
A. Similar magnetic poles
B. Opposite magnetic poles
C. Wood and plastic
D. Magnetic poles and wood

3. The magnetosphere is
A. responsible for the weak force of gravity on Earth.
B. responsible for the strong force of gravity on Earth.
C. the magnetic field that surrounds the solar system.
D. the magnetic field that surrounds the entire Earth.

4. A __________ is strongest near either the north or south pole.
A. polarization level
B. gravitational force
C. magnetic field
D. force of attraction

5. When is a material magnetized?
A. When opposite magnetic poles repel one another
B. When most of the magnetic domains in the material are aligned
C. When like magnetic poles attract one another
D. When magnetic domains in the material do not align

6. A __________ can have exactly two poles.
A. magnetosphere
B. magnet
C. non-magnetized object
D. compass

7. __________ and __________ are both aspects of electromagnetic force.
A. Magnetism; electricity
B. Electricity; gravitational force
C. Gravitational force; nuclear force
D. Magnetism; displacement

8. A magnetic field is created when
A. a digital signal is broadcasted.
B. an analog signal is broadcasted.
C. nuclear energy is converted into thermal energy.
D. electric charges are moving through a wire.

9. An electromagnet is formed when
A. a wire is connected to a 9-volt battery.
B. a wire with an electric current is coiled around an iron core.
C. a magnet repels like negative charges.
D. a magnet attracts opposite charges.

10. Changes to the __________ in an electromagnet can change the direction and strength of its magnetic field.
A. wavelength
B. amplitude
C. resistance
D. current

11. If similar magnetic poles come together, they will
A. attract each other.
B. repel each other.
C. stick to each other.
D. change color.

12. A magnetic domain is
A. a region with a high number of atoms with aligned magnetic fields.
B. a wire with an electric current coiled around an iron core.
C. responsible for the strong force of gravity on Earth.
D. the magnetic field that surrounds the solar system.

13. Most of a permanent magnet’s magnetic domains are aligned
A. after it loses all of its charge.
B. while it becomes demagnetized.
C. while it remains magnetized.
D. as long as the magnet is not magnetized.

14. What will happen to an electromagnet if the core is switched to one that is more easily magnetized?
A. Its strength will not change
B. Its strength will increase
C. Its strength will decrease
D. It will split into two electromagnets

15. Electromagnetic devices are used to change __________ into mechanical energy.
A. electrical energy
B. thermal energy
C. static energy
D. nuclear energy

16. Which of the following is an example of an electric motor?
A. A device that changes magnetic energy into thermal energy
B. A loudspeaker that reproduces music or other sounds
C. A galvanometer that measures small amounts of current
D. A device that uses an electromagnet to turn an axle

17. What produces a changing magnetic field in the solenoid coil of a loudspeaker?
A. Removing solenoid coils
B. Adding solenoid coils
C. Changing current
D. Keeping constant current

18. A galvanometer is used as
A. a loudspeaker.
B. an automobile gas gauge.
C. an electric motor.
D. a compass.

19. What can happen if the amount of current or direction of current in a solenoid coil changes?
A. The solenoid attracts more metal
B. Greater polarization can occur
C. Different noises can be created
D. The solenoid loses metal

20. Which of the following devices contains a solenoid?
A. Loudspeaker
B. Wheel and axle
C. Lever
D. Wedge

21. What device has a needle that aligns with the magnetosphere?
A. Loudspeaker
B. Galvanometer
C. Wedge
D. Compass

22. All of the following devices use electromagnets EXCEPT:
A. Telephone
B. Doorbell
C. Hair dryer
D. Frying pan

23. A solenoid is a coil of
A. thin string that produces an electromagnetic device.
B. thin metal that produces an electromagnetic device.
C. current-carrying wire that produces a magnetic field.
D. current-carrying wire that repels a magnetic field.

24. An electric motor uses a(n) __________ to turn __________.
A. axle; a wheel
B. electromagnet; an axle
C. electromagnet; a solenoid
D. solenoid; an electromagnet

25. All of the following affect the strength of an electromagnet EXCEPT:
A. the current in the solenoid
B. the color of the solenoid coil
C. the number of loops in the soleno

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