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  1. Frequency of stretched string will increase by
  2. A photon of energy 10.2 eV collide inelastically with hydrogen atom in ground state
  3. The angle of incidence at which reflected light is totally polarised for refraction
  4. A boat which has a speed of 5 kmh⁻¹ in still water crosses river of width 1 km long
  5. SI unit of magnetic dipole moment is