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6. Which is the best conductor of electricity? A. aluminum B. gold C. copper 7. Our body is also a good conductor of electricity because of the presence of A. blood B. hair C. water 8. Why is electrical wiring usually covered with a layer of plastic? A. To make it look pretty. B. To help electricity flow along the wire. C. To make it safe. D. To make it strong. 9. The following materials use conductor of heat and electricity to function except one. Which is it? A. lighted candle B. water heater C. lighted electric bulb D. washing machine 10. Why are cooking pots made of metals such as iron and aluminum? A. Heat moves quickly through metals. B. Metals are cheap. C. Metals are easy to find. D. Metals don't melt. 11. Which term defines a material that heat does not move through easily? A. conduction B. conductor C. heat D. insulator 12. Which would be the best heat insulator? A. knitted hat B. paper hat C. copper pot D. metal fork
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