JUULI
1. Some materials allow an electric current to flow through them. They are
called
_electricity
A. Conductors B. Convectors C. Insulators D. Radiators
2. Which of the following materials are good conductors of heat?
A. Glass, cloth, paper
B. Iron nail, silver, copper
C. Aluminum, plastic, rubber
D. Ceramic cups, disposable glass, silver
3. Which is a poor conductor of electricity?
A. Copper
B. Rubber
C. Silver
D. Water
4. Why is electrical wiring usually covered with a layer of plastic?
A. To help electricity flow along the wire
B. To make it look better
C. To save electricity
D. To make it safe
5. Why is aluminum used in making cooking pans?
A. it is very strong
B. it has a very high density.
C. it is a good conductor of heat.
D. it is a good conductor of electricity.
answer
1A
2C
3D
4B
5A
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