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Current Electricity

Current Electricity
Conductivity is the reciprocal of

Resistivity
Resistance
None of the listed here
Current density

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

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

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Current Electricity
Are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators.

Semiconductors
Variable resistors
Varistors
Thermistor

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

Copper
Carbon
Porcelain
Manganin

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Current Electricity
An instrument which detects electric current is known as

Wattmeter
Galvanometer
Voltmeter
Rheostat

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Current Electricity
When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will

Increase
Remain constant
None of these
Decrease

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