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Current Electricity

Current Electricity
A copper wire has a resistance of 10 Ω. It is stretched by one-tenth of its original length. Then its resistance will be

9 Ω
11 Ω
12.1 Ω
10 Ω

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Current Electricity
One commercial unit of energy equals

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

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Current Electricity
Ampere-hour is the unit of

Power
Quantity of electricity
Energy
Strength of current

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Current Electricity
Resistance of a material always decreases if

Temperature of material is increased
Temperature of material is decreased
None of these
Number of free electrons available becomes more

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Current Electricity
In which of the following substances the resistance decreases with increase in temperature?

Silver
Constantan
Copper
Carbon

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Current Electricity
The rating of a fuse wire is always expressed in

Amperes
Ampere-hours
kWh
Ampere-volts

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