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Current Electricity

Current Electricity
The weight of an aluminium conductor as compared to a copper conductor of identical cross-section, for the same electrical resistance, is

1.5
1
0.5
0.6

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Current Electricity
Ohm's law is not applicable to

Circuits with low current densities
Vaccum tubes
Carbon resistors
High voltage circuits

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Current Electricity
In a circuit a 33 Q resistor carries a current of 2 A. The voltage across the resistor is

66 V
132 V
33 V
80 V

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Current Electricity
The resistance of a copper wire 200 m long is 21 ω. If its thickness (diameter) is 0.44 mm, its specific resistance is around

1.8 x 10-8 ω-m
1.4 x 10-8 ω-m
1.6 x 10-8 ω-m
1.2 x 10-8 ω-m

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Current Electricity
Varistors are

Resistor with zero temperature co-efficient
Carbon resistors
Non-linear resistors
Insulators

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Current Electricity
Resistance of a tungsten lamp _____ as applied voltage increases.

None of the listed here
Decreases
Increases
Remains same

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