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?

Rain water contains dissolved salts. This makes it a conducting solution. There are no dissolved salts present in the distilled water because it is made pure by certain methods. Hence, rain water can allow electricity to pass through it while distilled water cannot.