Directions: Read the questions carefully. Write the letter of the correct answer on your
answer sheet
1. It is an object that attracts or pulls on certain materials like iron and steel.
A. Magnetite
B. Magnet
C. Electrons
D, Protons
2. To decrease the strength of an electromagnet
A. use a bigger nail as the iron core
B. decrease the number of loops of wire in the coil.
C. increase the number of loops of wire in the coil
D. All of the above
3. Which one of the following is not a part of an electromagnet?
A. the coiled wire
B. the nail as the core
C. the pins attracted by the electromagnet
D. the dry cell as the source of electricity
4. Which of the following devices makes use of electromagnets?
A. telephone C. electric bell
B. electric buzzer D. all of the given responses
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 of the following factors affects the strength of an electromagnet?
A. Number of dry cell used
B. Number of coils
C. Size of the iron core
D. All of the above

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