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Current Electricity

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

Zinc
Silver
Copper
Gold

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Current Electricity
The thickness of insulation provided on the conductor depends on

None of the listed here
Both magnitude of voltage and current
The magnitude of voltage on the conductor
The magnitude of current flowing through it

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Current Electricity
A copper wire is stretched so that its length is increased by 0.1 % . The change in its resistance is

0.4%
None of the listed here
0.3%
0.2%

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Current Electricity
Three 60 W bulbs are in parallel across the 60 V power line. If one bulb burns open

All three bulbs will light
Rest of the two bulbs will not light
The other two bulbs will light
There will be heavy current in the main line

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Current Electricity
Current velocity through a copper conductor is

the same as propagation velocity of electric energy
nearly 3 x 108 m/s
independent of current strength
of the order of a few ^.s/m

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Current Electricity
An open resistor, when checked with an ohmmeter reads

Low but not zero
High but within tolerance
Infinite
Zero

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