The rise in temperature of fuse wire depends upon :

1. current rating
2. radius r
3. length of wire
4. both (1) and (2)

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 rating of a fuse connected in the lighting circuit is:

1. 15 A
2. 5 A
3. 10 A
4. zero

A switch must be connected in the:

1. live wire
2. neutral wire
3. earth wire
4. either earth or neutral wire