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  1. When a mass m is attached to a spring, it normally extends by 0.2 m.
  2. Photons of energy 6 eV are incident on a metal surface whose work function is 4 eV.
  3. Four identical rods are joined to from a square. If the temperature difference
  4. A battery having e.m.f. 4 volt and internal resistance 0.5 Ω is connected
  5. A long solenoid has 500 turns. When a current of 2 ampere is passed through it