Q32. Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpour? Explain.


Q33. 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?


Q34. What are the chemical effects of electric current?


Q35. A tester is used to check the conduction of electricity through two liquids, labeled 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.


Q36. What happens when electric current is passed through acidified water?


Q37. Tap water conducts electricity whereas distilled water does not. Give reason.


Q38. Why is electroplating useful?


Q39. Paheli had heard that rainwater is as good as distilled water. So she collected some rainwater in a clean glass tumbler and tested it using a tester. To her surprise she found that the compass needle showed deflection. What could be the reasons?


Q40. Prepare a list of objects around you that are electroplated.


Last modified: Sunday, 8 September 2019, 5:27 PM