11. Which of the following can make a electromagnetic stronger?
A. Increase the number coils of the wire
B. Add more dry cells
C. Use a bigger core
D. All of the above

12. Which device makes use of electromagnet?
A. telephone
B. electric buzzer
C. electric bell
D. all of the above

13. Which is a part of an electromagnet? A. wire
B. pin
C. thumbtacks
D. needles

14. Which of the following is a conductor in an electromagnet?
A. Copper
B. rubber
C. plastic
D. wood

15. Which is NOT part of an electromagnet?
A. magnet
B. wire
C. nail
D. battery

16. Which activity uses an electromagnet? A. polishing the floor
B. using a door bell
C. lighting a room
D. cooking

17. In constructing an electromagnet, which material do you need?
A. dry cell
B. wire
C. iron nail
D. all of the above

18. What happens when one end of the wire is disconnected from the dry cell?
A. Electricity continues to flow.
B. Magnetism is gone.
C. The electromagnet becomes permanent.
D. It becomes stronger.

19. Which of the following will be attracted to an electromagnet?
A. pins
B. needles
C. thumbtacks
D. all the above

20. Which is an example of a temporary magnet?
A. bar magnet
B. horseshoe magnet
C. electromagnet
D. magnetite

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