Q6 of 12 Page 182

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

No. Pure water does not conduct electricity. Pure water does not contain any ions which make it conducting. But it can conduct electricity when a pinch of common salt is added to it, as salt solution is conducting in nature.


More from this chapter

All 12 →
4

The bulb does not glow in the setup shown in Fig. 14.10. List the possible reasons. Explain your answer.

 5

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

(i) liquid A is a better conductor than liquid B.


(ii) liquid B is a better conductor than liquid A.


(iii) both liquids are equally conducting.


(iv) conducting properties of liquid cannot be compared in this manner.

 7

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.

 8

A child staying in a coastal region tests the drinking water and also the seawater with his tester. He finds that the compass needle deflects more in the case of seawater. Can you explain the reason?