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Current Electricity

Current Electricity
The electrical energy required to heat a bucket of water to a certain temperature is 4 kWh. If the heat losses are 20 percent, the energy input is

3.2 kWh
6 kWh
5 kWh
2 kWh

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Current Electricity
At 0 K, germanium behaves as

An insulator
A conductor
A superconductor
A ferromagnetic substance

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Current Electricity
The resistance of a straight conductor is independent of

Cross-sectional area
Shape of cross-section
Material
Temperature

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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

20 W
60 W
40 W
10 W

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Current Electricity
One Newton meter is same as

Five joules
One joule second
One joule
One watt

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Current Electricity
Electrical current is due to the flow of

Positive charges only
Both positive and negative charges
Negative charges only
Neutral particles only

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