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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

Either Rl or Ri
None of them
Ri
Rl

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Current Electricity
Which of the following materials has the least resistivity ?

Lead
Mercury
Copper
Zinc

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

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Current Electricity
For testing appliances, the wattage of test lamp should be

High
Any value
Low
Very low

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Current Electricity
A rheostat differs from potentiometer in the respect that it

Offers large number of tapping
Has higher wattage rating
Has lower wattage rating
Has large number of turns

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