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Current Electricity

Current Electricity
Two resistances Rl and Ri are connected in series across the voltage source where Rl > Ri. The largest drop will be across

None of them
Ri
Either Rl or Ri
Rl

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Current Electricity
A field of force can exist only between

Two atoms
Two metal particles
Two ions
Two molecules

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Current Electricity
Constantan wire is used for making starndard resistance because it has

High melting point
Negligibly small temperature co-efficient of resistance
High specific resistance
Low specific resistance

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Current Electricity
Resistance of a material always decreases if

Temperature of material is decreased
Temperature of material is increased
Number of free electrons available becomes more
None of these

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Current Electricity
With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals

20 W
10 W
40 W
60 W

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Current Electricity
The hot wire of electric bulb's filament is higher than its cold resistance because the temperature co-efficient of filament is

None of the listed here
Negative
Positive
Zero

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