1. MULTIPLE CHOICE Encircle the correct answer.
Which is true about electromagnets?
A They are permanent.
B. They don't need battery
C. Increasing the number of coils makes the electromagnet stronger
D. Increasing the battery makes the electromagnet weaken?

2. What material is produced when a coil of wire is wind around an iron nail?
A Battery B. circuit
C. electromagnet
D. magnet

3 Which does not affect the magnetism of an electromagnet?
A Magnet B Number of Batteries C. Number of coils D Size of the nail

4.A magnet is
A. A wooden figure
B. An object that attracts or pulls on certain materials like iron and steel
C. A magnetic force
D. An object that allows light to pass through

5. An electromagnet is
A. A compass
B. A magnet made when electric charges move through a coil of wire wrapped
around an iron core or center.
C. A device that produces electric current from energy stored in chemicals
D. A device than can prevent electric shock

6. Which is not a static electricity?
A Two magnets sticking together
C. lightning
B. Paper sticking to a balloon the dryer
D. socks sticking together out of

7. Which makes the force of an electromagnet stronger?
A Bigger iron nail
C. less coils of wire
В. less battery
D. more bar magnets

8. Which of the following devices do not used electromagnets?
B. generator
A doorbells
D. speakers
C. light bulb

9. What happens when you disconnect an electromagnet from a battery?
A. It will explode
C. It will continue from attracting non metals
D. Nothing will happen
B. It will stop from attracting metals

10. The following are the materials in making a simple electromagnet, except?
D. wood
C. iron nail
B. battery
A. Coiled wire​