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Current Electricity

Current Electricity
If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes

0.4 ohm
0.8 ohm
1.0 ohm
0.6 ohm

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Current Electricity
Insulators have _______ temperature co-efficient of resistance.

Positive
Negative
None of the listed here
Zero

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Current Electricity
Three resistance of 10 ohms, 15 ohms, and 30 ohm are connected in parallel. The total resistance of the combination is

55 ohms
10 ohms
15 ohms
5 ohms

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Current Electricity
Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as

2 : 5
4 : 25
5 : 2
25 : 4

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Current Electricity
An electric filament bulb can be worked from

DC supply only
AC supply only
Battery supply only
All of the listed here

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Current Electricity
Ohm's law is not applicable to

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

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