Electric Circuits
Can a 250 V, 5 A single way switch be used in place of a 250 V, 15 A Switch?

  Yes.
  Single way switch doesn exist.
  Single way switch doesn operate at such current ratings.
  No.

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Electric Circuits
Pure metal generally have

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

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