Question

Select the best insulator among the following
(a) Pure water
(b) Human body
(c) Aluminium
(d) Mercury

  • Category: Current Electricity Class 9 ICSE
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Answer

(s) Pure water

Reason — Pure water is a good insulator as it has a low concentration of ions so it does not conduct electricity very well. On the other hand, the human body, aluminum, and mercury are not good insulators. The human body contains electrolytes and can conduct electricity. Aluminum is a metal and is highly conductive. Mercury is a liquid metal and also conducts electricity well.

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