11. Which of the following can make an electromagnetic stronger?
A. Increase the number coils of the wire
B. Add more dry cell
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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