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Question 11 Mark

Yashika was given an electroscope with its gold leaves diverged. What do the diverged leaves indicate? She was also given a rod which she did not know was charged or not. Yashika touched the rod to the cap of the electroscope to find that the divergence of the gold leaves decreased. What should she infer about the charge status of the rod?

Answer

The diverged gold leaves of the electroscope indicates that the electroscope is charged. When the rod was brought in contact with the cap of the electroscope, the divergence of the gold leaves decreased. This means that the rod was charged with a charge opposite to that of the electroscope.

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Question 21 Mark

Why does current flow through the earth wire?

Answer

In case of a fault, excessive current flows through the earth wire because it provides conducting path to the earth.

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Question 31 Mark

Why is a gold leaf electroscope enclosed in a glass case?

Answer

An electroscope is enclosed in a glass jar to protect the gold leaves from the drafts of air current.

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Question 41 Mark

What would happen if electrical appliances are not connected to the earth wire ?

Answer

If electrical appliances are not connected to the earth wire, then in case of leakage of current from the appliance, the undesired current reaching its outer body passes through the person touching the device, and he gets an electric shock.

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Question 51 Mark

Why does a fuse wire has lower melting point than that of connecting wires ?

Answer

A fuse wire has a melting point less than that of connecting wires. This is to ensure that the fuse wire melts before the connecting wires in case the circuit gets overheated due to overloading or short circuit.

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