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  1. The energy of a hydrogen atom in the ground state is – 13.6 eV. The energy of a He⁺ ion
  2. An electric kettle has two heating elements. One brings it to boil in ten minutes
  3. A particle moving along a straight line OX.At a time (in second ) the distance
  4. A battery of e.m.f. E and internal resistance r is connected to an external resistance
  5. If α (current gain) of transistor is 0.98, then what is the value of β