I. Choose the Letter of the best answer.
1. Which acts like a magnet?
A nail
B. wire
C. dry cell
D.none of above
2. What is produced when electricity flows in a conductor?
A. coil
B. magnetism
C. nail
D. wire
-3. When does an electromagnet operate?
A. When there is a nail.
B. When there is a wire.
C. When there is a dry cell
D. When there is a flow of electricity
-4. Which one is NOT part of an electromagnet?
A the coil of wire
B. the nail as the core
C. the dry cell as source of electricity
D. pins, clips, and needles attracted by an electromagnet
5. What happens when a part of an electromagnet is disconnected?
A. It loses its magnetism
B. Electricity continues to flow through it.
C. The electromagnet becomes a permanent magnet
D. There is an increase in the number of materials attracted
6. Which appliance does NOT use
of electromagnet
A. telephone
B. television
C. radio
D. broom
7. Which is NOT made of electromagnet?
A. cooking pan
B. transformer
C. generator
D. motor
8. Which of these forces can be used in a motor?
A. magnetism
B. wind
C. friction
D. gravity
9. Electromagnets are_________.
A. permanent
B instant
C temporary
D.stable
10. Which makes an electromagnet work?
A needle
B. electricity
C. pin
D. thumbtacks

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