Multiple Choice: Choose the letter of the correct answer.
1. What happens to the strength of a magnetic field as you move away from the magnet?
A. The strength of the magnetic field increases.
B. The strength of the magnetic field doesn't change.
C. The strength of the magnetic field is doubled.
D. The strength of the magnetic field decreases.
2. Particles with opposite charges ____________ and particles with same (or like) charges ____________.
A. attract, repel
B. repel, repel
C. attract, attract
D. repel, attract
3. How do you make an electromagnet stronger?
A. Add a motor and/or lightbulbs
B. Add more light bulbs and/or wire coils
C. add more wire coils and/or a switch
D. add more wire coils and/or batteries
4. This is a picture of a simple electromagnet. How can the electromagnet be made stronger?
A. Add more coils of wire to the nail.
B. Use a smaller battery.
C. Reverse the poles of the magnet.
D. Remove all the coils and the nail.
5. Which of the following is not a good conductor?
A. Copper
B. Silver
C. Aluminum
D. Plastic
6. What happens when an electric current flow through a wire?
A. The wire begins to spin.
B. Nothing happens.
C. A field of gravity is created around the wire.
D. A magnetic field is created around the wire.
7. What does this image show?
A. Parallel circuit
B. Series circuit
C. Magnet
D. Electromagnet
8. The area of magnetic force around a magnet is known as its ____________.
A. magnetism
B. magnetic current
C. magnetic field
D. electric current
9. Increasing the number of coils in an electromagnet will _________ the power of the magnet.
A. decrease
B. increase
C. not affect
10. What type of core is best for electromagnets?
A. Steel
B. Iron
C. Plastic
D. Copper
11. As the strength of a magnetic field increases, the ability to attract metal objects ____________.
A. increases
B. decreases
C. stays the same
12. Magnetism is generated by moving
A. protons.
B. electrons.
C. neutrons.
D. elements.
13. What do the lines around this magnet represent?
A. North Pole
B. South Pole
C. Magnetic Declination
D. Magnetic Field
14. If you cut a magnet in half, what happens to the poles?
A. One half gets the North Pole, the other half gets the South Pole
B. Both halves get only a North Pole
C. Both halves get only a South Pole
D. Both halves get a North pole and a South Pole
15. The strongest part of a magnet is...
A. the bars.
B. the force fields.
C. the poles.
D. the middle.
16. A coil of wire with an electric current flowing through it is called a(n)
A. transformer
B. electric generator
C. electric motor
D. solenoid
17. This material is hard to magnetize, but stays magnetized
A. temporary
B. permanent
C. Aluminum magnet
D. Electromagnet
18. Which of the following statements best describes an electric generator?
A. A magnet is rotated through a coil of wire to produce an electric current.
B. Electric potential in a rotating coil of wire creates a permanent magnet.
C. An electrical current causes a coil of wire to rotate in a magnetic field.
D. Forces from a permanent magnet allow a coil of wire to rotate.
19. What happens to the direction of the magnetic field around a wire if the electric current moving through the wire is reversed?
A. It reverses direction.
B. It stays the same.
C. It does not have a direction.
D. The magnetic field stops
20. A worker at a scrap metal yard had to move pieces of iron from one side of the yard to the other side of the yard using an electromagnet. After easily moving some of the smaller pieces of iron, he could not get a larger piece of iron to stay attracted to the electromagnet because it was too heavy. Since he is using an electromagnet, which of the following could he do to strengthen the electromagnet’s magnetic field in order to lift the large piece of iron?
A. decrease the number of coils of wire in the solenoid
B. increase the electric current moving in the solenoid
C. use a smaller iron core
D. He cannot change the electromagnet’s strength.
Answers
Answered by
1
Answer:
1. D
2. A
3. D
4. A
5. D
6. D
7.Don't know
8. C
9. B
10. B
11. A
12. B
13. Don't know
14. A
15. Don't know
16. D
17. B
18. A
19. A
20. B
Similar questions