Electric Circuits
Four resistances 80 Ohm, 50 Ohm, 25 Ohm and R are connected in parallel. Current through 25 Ohm resistance is 4A. Total current of supply is 10A. The value of R will be

 66.66.
 36.36.
 76.66.
 40.25.

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Electric Circuits
Pure metal generally have

  high conductivity and low temperature coefficient.
  low conductivity and high temperature coefficient.
  high conductivity and large temperature coefficient.
  low conductivity and zero temperature coefficient.

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