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Question

Which of the following is an electrical insulator :

A
Aluminium
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B
Gold
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C
Rubber
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D
None of these
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Solution

The correct option is C Rubber
Metals are generally good conductors of electricity. So, Gold and Aluminium are good conductors of electricity.
Non-metals are poor conductors of electricity.
So rubber, being a non-metal, is an electrical insulator and hence a poor conductor of electricity.

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