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Current Electricity

Current Electricity
Temperature coefficient of resistance is expressed in terms of

mhos/ohm°C
ohms/°C
ohms/ohm°C
mhos/°C

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Current Electricity
A copper wire has a resistance of 10 Ω. It is stretched by one-tenth of its original length. Then its resistance will be

12.1 Ω
10 Ω
11 Ω
9 Ω

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

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

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Current Electricity
Which of the following is the best material for making connecting wires?

Manganin
Nichrome
Copper
Constant

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Current Electricity
A field of force can exist only between

Two metal particles
Two ions
Two molecules
Two atoms

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

Lead
Zinc
Copper
Mercury

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