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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%
0.4%
0.2%

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Current Electricity
An open resistor, when checked with an ohmmeter reads

High but within tolerance
Low but not zero
Infinite
Zero

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Current Electricity
The hot resistance of the bulb's filament is higher than its cold resistance because the temperature coefficient of the filament is

About 2 ohms per degree
Positive
Zero
Negative

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Current Electricity
Out of the following which is not a poor conductor?

Carbon
Cast iron
Copper
Tungsten

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Current Electricity
If an electric current is passed through a nerve, the man

Becomes insensitive to pain
Begins to weep
Is excited
Begins to laugh

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Current Electricity
What voltage drop will be there across a 1 kW electric heater whose resistance when hot is 40 Ω?

200 V
150 V
100 V
50 V

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