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Current Electricity

Current Electricity
If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes

0.6 ohm
0.4 ohm
0.8 ohm
1.0 ohm

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Current Electricity
Insulators have _______ temperature co-efficient of resistance.

None of the listed here
Negative
Zero
Positive

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Current Electricity
All good conductors have high

Conductance
Reluctance
Thermal conductivity
Resistance

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Current Electricity
The filament of electrical bulb is made of

Steel
Nickel
Tungsten
Aluminium

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Current Electricity
One commercial unit of energy equals

One watt-hour
One watt-hour
One kilowatt-hour
Ten kilowatt-hour

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Current Electricity
What voltage drop will be there across a 1 kW electric heater whose resistance when hot is 40 Ω?

200 V
150 V
100 V
50 V

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