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13. Why is electrical wiring usually covered with a layer of plastic? A. to make it look pretty B. to make it strong C. to make it safe D. to help electricity flow along the wire 14. Which are you going to use to prevent from getting bums when holding a hot pot? A big pan B. plastic folder C. pot cover D. potholder 15. Which warms fast when dipped in boiling water? A. handle wrapped with paper B. metal handle C. plastic handle D. wood handle 16. How can we identify if a material is a good conductor of heat and electricity? A. If heat and electricity cannot pass through easily B. If heat and electricity can pass through easily C. If a material is made up of wood D. If a material is made up of plastic 17. Why are cooking pots made of metals such as iron and aluminum? A. Heat moves quickly through metals. B. Metals are easy to find. C. Metals are cheap. D, Metals do not melt. 18. Tony is boiling a pot of water on the stove. The black handle is made of rubber, and the pot is made is made of copper. Why is the black handle made of rubber and the pot of copper? A. Rubber is good conductor, and copper is a good insulator. B. Rubber is a poor insulator, and copper is a poor conductor, C. Rubber is a good insulator, and copper is a good conductor. D. Rubber is a good conductor, and copper is a good insulator.
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