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Current Electricity

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

Lead
Zinc
Copper
Mercury

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

High
Very high
Low
Practically zero

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

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

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

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

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Current Electricity
The weight of an aluminium conductor as compared to a copper conductor of identical cross-section, for the same electrical resistance, is

0.5
1.5
0.6
1

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Current Electricity
Electric current passing through the circuit produces

Chemical effect
Luminous effect
Thermal effect
Magnetic effect

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MORE MCQ ON Current Electricity

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