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Current Electricity

Current Electricity
Specific resistance of a substance is measured in

Ω/m
None of the listed here
Ω-m
m/Ω

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Current Electricity
An electrical lamp coonsumes 100 W of power. If the supply voltage is 220 V the energy consumed in 30 minutes is

0.05 kWh
5 kWh
5 kWh
0.005 kWh

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

Zero
None of the listed here
Positive
Negative

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Current Electricity
With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals

10 W
20 W
40 W
60 W

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

0.8 ohm
0.4 ohm
0.6 ohm
1.0 ohm

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Current Electricity
One commercial unit of energy equals

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

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