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Choose the letter of the correct answer.
1. Which of the following DOES NOT belong to the group? A. aluminum B. copper C. plastic D. iron
2. Some materials that allow an electric current to flow through themare called of electricity. A. insulators B. conductors C. convectors D. radiators
3. Materials that block an electric current from flowing are called A. insulators B. conductors C. convectors D. radiators
4. Why are electric wire usually made up of copper? A. Because copper is a good insulator B. Because copper is a good conductor C. Because copper is a poor insulator. D. Because copper is a poor conductor
5. Which is the best conductor of electricity? A. aluminum B. gold C. copper D. silver
6. Which of the following is an insulator? Airon B. water C. rubber D. aluminum
7. The main reason for using aluminum to make cooking pans is because: A. it is good conductor of heat B. it is good conductor of electricity C. it has ba very high density D. it is very strong
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