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Current Electricity

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

60 W
40 W
10 W
20 W

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Current Electricity
The specific resistance of a metallic conductor ______ with rise in temperature.

None of the listed here
Remains unchanged
Decreases
Increases

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Current Electricity
The resistance of two wires is 25 Ω when connected in series and 6 Ω when joined in parallel. The resistance of each wire is

10 Ω, 15 Ω
10 Ω, 20 Ω
20 Ω, 30 Ω
5 Ω, 10 Ω

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Current Electricity
When one lag of parallel circuit is opened out the total current will

Increases
None of the listed here
Decreases
Become zero

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Current Electricity
Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as

2 : 5
25 : 4
5 : 2
4 : 25

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Current Electricity
One commercial unit of energy equals

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

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