If electric wires and appliances are overheated due to high voltage of electric current they can
a) Catch fire
b) Burn
c) Freeze
d) Both a and b
An
instrument which detects electric current is known as………….
a) Voltmeter
b) Rheostat
c) Wattmeter
d) Galvanometer
With rise in temperature the resistance of semi-conductors……………..
a) Decreases
b) Increases
c) First increases and then decreases
d) Remains constant
With rise in temperature the resistance of pure metals…….
a) Increases
b) Decreases
c) First increases and then decreases
d) Remains constant
The S.I. unit of power is…………………..
a) Henry
b) Coulomb
c) Watt
d) Watt-hour
