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 full form of MCB is :

1. miniature current breaker
2. miniature current board
3. miniature circuit breaker
4. miniature circuit board

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)

Assertion (A): A fuse wire must have a high resistance and low melting point.

Reason (R): A fuse is only used for a small current flow.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true and R is not the correct explanation of A.
3. assertion is false but reason is true.
4. assertion is true but reason is false.