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17 Which of the following can save electricity.
A. Use the electric fan for 24 hours a day.
B. Always open the refrigerator to cool yourself. C. Unplug the appliances from the outlet when not in use.
D. Turn on all the lights in all parts of the house during nighttime.
18. Which is true about electromagnets
A. They are permanent
B. They don't need a battery.
C. Increasing the number of wires make the electromagnet stronger
D. Increasing the number of batteries makes the electromagnet weaken.
19. How will you make a circuit open
A. By connecting the wires
B. By pushing the switch off
C. By pushing the switch on
D. By positioning the batteries well
20. How will you describe a magnet?
A. a material that absorbs liquid
B. a material with end poles called east and west
C. a material that attracts made of plastic and rubber
D. a material that attracts objects made of iron and steel.
21. The following are needed in constructing an electromagnet, which is NOT included
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