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Current Electricity

Current Electricity
The current in the circuit having constant resistance is tripled. The power increases

1/3 times
1/9 times
9 times
3 times

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Current Electricity
It becomes more difficult to remove

First electron from the orbit
Third electron from the orbit
Any electron from the orbit
Second electron from the orbit

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Current Electricity
The resistance of a copper wire 200 m long is 21 ω. If its thickness (diameter) is 0.44 mm, its specific resistance is around

1.4 x 10-8 ω-m
1.8 x 10-8 ω-m
1.6 x 10-8 ω-m
1.2 x 10-8 ω-m

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Current Electricity
A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb, the heater output will

Remains same
Heater will burn out
Increases
Decreases

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Current Electricity
The hot wire of electric bulb's filament is higher than its cold resistance because the temperature co-efficient of filament is

Negative
Positive
None of the listed here
Zero

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Current Electricity
With rise in temperature the resistance of pure metals

Increases
First increases and then decreases
Decreases
Remains constant

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MORE MCQ ON Current Electricity

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