Exercise V — task. Science CBSE, Class 8.

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1. A tester is used to check the conduction of electricity through two liquids, labelled A and B. It is found that the bulb of the tester glows brightly for liquid A while it glows very dimly for liquid B. You would conclude that

both liquids are equally conducting.
liquid B is a better conductor than liquid A.
liquid A is a better conductor than liquid B.
conducting properties of liquid cannot be compared in this manner.

2. Does pure water conduct electricity? If not, what can we do to make it conducting?

Yes, pure water partially conducts electricity.
Yes, pure water conducts electricity.
No, pure water doesn’t conduct electricity.
No, pure water partially conducts electricity.

3. In case of a fire, before the firemen use the water hoses, they shut off the main electrical supply for the area. Explain why they do this.

The water in the water hoses is and is a . To protect themselves and others from electrocution, the firemen turned off the power before spraying water.

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5. Exercise V

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