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Current Electricity

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

Zinc
Gold
Copper
Silver

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

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

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Current Electricity
Current velocity through a copper conductor is

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

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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

Increase
Remain constant
None of these
Decrease

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Current Electricity
In a lamp load when more than one lamp are switched on the total resistance of the load

Decreases
None of these
Remains same
Increases

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Current Electricity
The resistance of a few meters of wire conductor in closed electrical circuit is

High
Low
Practically zero
Very high

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