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___6. David wants to construct an electromagnet. He has a long piece of iron wire and two dry cells. What else does he need?
A.iron screw B. glass tube C. plastic tube D. aluminum screw
___7. Which of the following devices makes use of electromagnet?
A. Electric bell B. telephone C. Electric buzzer D. all of the given options
___8. Which one of the following is not a part of an electromagnet?
A. The wire coil
B. The nail as the core
C. The dry cell as the source of electricity
D. Pins, clips, and needles attracted by the electromagnet
___9. 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.
___10. You notice that a part of the cord attached to your electric iron is worn out. Which of the following can you do as a safety precaution ?
A.Wrap the worn out part of the cord with electric tape.
B.Wrap the worn out part of the cord with a piece of paper.
C.Wrap the worn out part of the cord with a piece of rag
D.Wrap the worn out part of the cord with a piece of tin foil
___11. Which object is not used in making an electromagnet? A. electricity B. wire C.magnet D. core ___12. Which is an example of a temporary magnet? A.bar magnet B.horseshoe magnet C. electromagnet D. magnetite
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