Physics
An alloy of lead and tin is used as the material of the fuse wire because its melting point is …………… and specific resistance is …………… ,
- high, high
- low, high
- low, low
- high, low
Answer
low, high
Reason — An alloy of lead and tin is used as the material of the fuse wire because its melting point is low, so that it may easily melt due to overheating when current in excess to the prescribed limit passes through it and specific resistance is high so that sufficient heat is required to melt it.
Related Questions
In a three pin plug, the longest pin is :
- live pin
- neutral pin
- earth pin
- can be any
The purpose of earthing in a household circuit is to :
- provide a connection to appliance
- complete the circuit
- prevent electric shock
- increase the voltage
The rating of a fuse connected in the lighting circuit is:
- 15 A
- 5 A
- 10 A
- zero
The use of MCB is more convenient than a fuse because :
- it avoids the inconvenience of connecting a new fuse wire
- it is much safer for quick response
- it takes a very long time for tripping
- both (1) and (2)