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Current Electricity

Current Electricity
Which of the following material has nearly zero temperature co-efficient of resistance?

Manganin
Porcelain
Carbon
Copper

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Current Electricity
Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be

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

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Current Electricity
The resistance of a few meters of wire conductor in closed electrical circuit is

Practically zero
Low
Very high
High

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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
Decreases
Increases

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Current Electricity
Ampere-hour is the unit of

Quantity of electricity
Strength of current
Power
Energy

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Current Electricity
One commercial unit of energy equals

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

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