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  1. If the r.m.s. velocity of a gas is v, then
  2. In p- type semiconductor, the acceptor level lies
  3. The wave described by y = 0.25 sin (10 2πx – 2πt), where x and y are in meters
  4. The number of beta particles emitted by a radioactive substance is twice the number
  5. Three identical spherical shells, each of mass m and radius r are placed