with the increase in temperature the resistance of pure metals:
increases
decreases
remains same
none of these
The A.C used in Pakistan has frequency:
60 Hz
30 Hz
50 Hz
130 Hz
the power of washing machine is:
700 W
750 W
650 W
800 W
When resistances are connected in parallel, the current passing through them is:
Same
Zero
Different
Infinite
Which instrument is used to detect current:
Galvanometer
Voltmeter
Ammeter
Electroscope
The colour of live wire is:
Black or blue
Green or yellow
White or grey
Red or brown
When we double the voltage in a simple electric circuit, we double the:
Current
Power
Resistance
Both a and b
the resistance of conductor is inversely to:
temperature
length
area of cross section
pressure
The commercial unit of electrical energy is:
Joule
Watt
Kilowatt hour
Electron volt
By keeping resistance constant if we double the voltage then current will be:
Double
4 times
ΒΌ times
Half
