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Current Electricity

Current Electricity
If the efficiency of a machine is to be high, what should be low?

kWh consumed
Losses
Input power
True component of power

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Current Electricity
Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as

25 : 4
4 : 25
5 : 2
2 : 5

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Current Electricity
The flow of current in solids is due to

Nucleus
Electrons
Atoms
Electrons and ions

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Current Electricity
A thermistor has

Variable temperature coefficient
Positive temperature coefficient
Negative temperature coefficient
Zero temperature coefficient

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Current Electricity
E. M. F. In a circuit

Increases circuit resistance
Decrease circuit resistance
Maintains potential difference
None of the listed here

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Current Electricity
Which of the following is the best conductor of electricity?

Copper
Zinc
Gold
Silver

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