Current Electricity

Physics
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If a wire is stretched to make it  longer, its resistance will 

A
increase by
B
increase by
C
decrease by
D
decrease by .
Medium
JEE Mains
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The Kirchhoffs first law  and second law  where the symbols have their usual meanings, are respectively based on  

A
conservation of charge, conservation of energy
B
conservation of charge, conservation of momentum
C
conservation of energy, conservation of charge
D
conservation of momentum, conservation of charge
Medium
JEE Mains
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A piece of copper and another of germanium are cooled from room temperature to 77 K, the resistance of : 

A
each of them increases
B
each of them decreases
C
copper decreases and germanium increases
D
copper increases and germanium decreases
Medium
JEE Mains
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