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  1. If radius of earth’s orbit is made 1/4, the duration of a year will become
  2. A hollow metal sphere of radius 10 cm is charged such that the potential on its surface
  3. The atomic number of the most common element in nuclear fusion is
  4. Rutherford’s α-scattering experiment concludes that
  5. The fossil bone has a ¹⁴C:¹²C ratio, which is [1/16] of that in a living animal