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CURRENT ELECTRICITY

Current Electricity
The insulation on a current carrying conductor is provided

Both of the listed here
To prevent shock
To prevent leakage of current
None of above factors

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Current Electricity
When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will

None of these
Remain constant
Increase
Decrease

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Current Electricity
Which of the following statement is true both for a series and a parallel D.C. circuit?

Voltages are additive
Power are additive
Currents are additive
Elements have individual currents

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Current Electricity
Voltage dependent resistors are usually made from

Silicon carbide
Graphite
Charcoal
Nichrome

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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

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

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