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Current Electricity

Current Electricity
A copper wire is stretched so that its length is increased by 0.1 % . The change in its resistance is

None of the listed here
0.3%
0.2%
0.4%

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Current Electricity
If the efficiency of a machine is to be high, what should be low?

Losses
True component of power
Input power
kWh consumed

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Current Electricity
A resistance having rating 10 ohms , 10 W is likely to be a

Carbon resistor
Wire wound resistor
Variable resistor
Metallic resistor

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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
10 W
40 W
60 W

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Current Electricity
The minimum charge on an ion is

Equal to the atomic number of the atom
Equal to the charge of the number of electrons in an atom (#) zero
None of these
Equal to the charge of an electron

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Current Electricity
Resistance of a carbon filament lamp _______ as the applied voltage increases.

Decreases
Increases
None of the listed here
Remains same

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