Question

7. Which of these can be used to produce an electric current? a. Graphite, wood, rubber b. Rubber, glass, wood, silver c. Pure water, wood, silver d. Copper, iron, silver, graphite. 8. Which of these is a set of only conductors of electric current? a. Wood, graphite, copper b. Copper, graphite, silver c. Graphite, plastic, glass d. Pure water, silver, copper. 9. Which of these statements is the most appropriate? a. An electric switch is used to light a bulb b. An electric switch is used to close or open an electrical circuit c. An electric switch can only be used with an external power supply d. All of these. 10. Which of these appliances in your house is not run by electricity? a. Geyser d. Music system. b. Gas burner c. Air conditioner





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Answer 1

Answer:

Ans for 7 : copper , iron , silver

Ans for 8 : pure water , silver , copper

Ans for 9 : All of these

Ans for 10 : Gas burner