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Current Electricity

Current Electricity
Resistance of a carbon filament lamp _______ as the applied voltage increases.

None of the listed here
Remains same
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

Zero
Negative
Positive
None of the listed here

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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?

100 V
200 V
50 V
150 V

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Current Electricity
Sparking occurs when a load is switched off because the circuit has high

Capacitance
Inductance
Impedance
Resistance

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Current Electricity
If the number of valence electrons of an atoms is less than 4,the substance is usually

An insulator
A semiconductor
None of the listed here
A conductor

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

Tungsten
Copper
Carbon
Cast iron

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