Electric Circuits
What are the points to be mentioned in specifying main switches?

  Current rating.
  Voltage grade.
  Both A and B.
  None of these.

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Electric Circuits
Atoms have no electric charge because they

 have an equal number of charged and non charged particles.
 have an equal number of electrons and protons.
 have neutrons in their nuclei.
 have an equal number of neutrons and protons.

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