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Current Electricity

Current Electricity
Two resistances Rl and Ri are connected in series across the voltage source where Rl > Ri. The largest drop will be across

Rl
Either Rl or Ri
Ri
None of them

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

Manganin
Carbon
Copper
Porcelain

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Current Electricity
Resistance of a material always decreases if

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

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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

12.1 Ω
9 Ω
10 Ω
11 Ω

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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
A thermistor has

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

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