The wire made from which of the following material is conductor?
a) glass
b) rubber
c) gold
d) silica
The electric device which melts, if current exceeds a certain fixed value, are…….
a) circuit breaker
b) fuses
c) earth wire
d) copper wire
The device that is used to protect a circuit against overload is……..
a) heater
b) fuse
c) lamp
d) switch
To prevent risk of electric shock the earth pin on a three-pin plug is connected to the part of device……..
a) plastic part of device
b) neutral wire
c) cable grip
d) metal case
To increase the strength of the electromagnet the best core material should be……..
a) plastic
b) rubber
c) aluminum
d) iron
Electromagnetic device which make of electromagnet is………
a) resistor
b) bulb
c) doorbell
d) three pin plug
