Electric Circuits
The arrangement of 12 cells each of internal resistance 1.5 Ohm to give maximum current in external load resistance of 2 Ohm will be

 all 12 in parallel.
 in 4 parallel rows each row having 3 cells in series.
 all 12 in series.
 in 3 parallel rows each row having 4 cells in series.

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Electric Circuits
Pure metal generally have

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

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