The purpose of earthing in a household circuit is to :

1. provide a connection to appliance
2. complete the circuit
3. prevent electric shock
4. increase the voltage

An alloy of lead and tin is used as the material of the fuse wire because its melting point is …………… and specific resistance is …………… ,

1. high, high
2. low, high
3. low, low
4. high, low

The use of MCB is more convenient than a fuse because :

1. it avoids the inconvenience of connecting a new fuse wire
2. it is much safer for quick response
3. it takes a very long time for tripping
4. both (1) and (2)

A switch in a table lamp is connected in the neutral wire. The lamp works fine. Identify the correct statement :

1. Current flow stops when switch is off, it is safe.
2. It is safe because neutral wire is at zero potential.
3. It is unsafe as switch gets heated.
4. It is unsafe as lamp body is connected to the live wire.