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1. Which of the following is NOT a permanent magnet?
A. bar magnet
B. ceramic magnet
C. electromagnet
D. horse shoe magnet
2. Which of the following is a flowing electricity?
A. current electricity
B. frictional electricity
C. static electricity
D. none of the above
3. All appliances need electromagnets to be used except one. Which one is it?
A. electric fan
B. pressure cooker
C. turbo broiler
D. washing machine
4. How can we increase the strength of an electromagnet?
A. Use a brand new pencil as core.
B. Use a metal part of the screw driver.
C. Use a tempered glass as the core.
D. Use an expensive gel pen as core.
5. What is a force of attraction or repulsion of magnetic materials due to the
management of atoms?
A. Circuit
B. Electromagnet
C. Electricity
D.Magnetism
6. Which statement is true about electromagnet?
A. It is a magnet made when electrical charges move thru a coil of wire wrapped
around an iron core or center.
B. A device that produces electric current from energy stored from chemicals.
C. A magnet that can prevent an electric shock.
D. They are permanent magnets.
7. Which of the following serves as source of electric current in an electromagnet?
A. conductor
B. core
C. dry cell
D. paper clip
8. The relationship between the strength of an electromagnet and the number of
coils is directly proportional. This means that ______________.
A. As the number of coil increases, the strength of the electromagnet increases.
B. As the number of coil increases, the strength of the electromagnet is still the
same.
C. As the number of coil decreases, the strength of the electromagnet
increases.
D. As the number of coil increases, the strength of the electromagnet
decreases.
9. Bernie carries one bar magnet. He accidentally dropped the bar magnet which
resulted to the splitting of magnets. What will happen to his magnet now?
A. He still has one magnet because the magnet just splits into half.
B. He doesn’t have any magnets at all because he dropped it.
C. He now has powdered magnets.
D. He now has two magnets.
10. An electromagnet is surrounded by a coil of wire through which an electric
current pass through. Which electromagnet can attract more pins?
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