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Question 2:
When the free ends of a tester are dipped into a solution, the magnetic needle shows deflection. Can you explain the reason?
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Question 6:
Does pure water conduct electricity? If not, what can we do to make it conducting?
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Question 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?
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Question 9:
Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpour? Explain
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Question 10:
Paheli had heard that rain water is as good as distilled water. So, she collected some rain water 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?
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Question 12:
The process that you saw in Activity 14.7 is used for purification of copper. A thin plate of pure copper and a thick rod of impure copper are used as electrodes. Copper from impure rod is sought to be transferred to the thin copper plate. Which electrode should be attached to the positive terminal of the battery and why?
