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  1. A radioactive element forms its own isotope after 3 consecutive disintegrations.
  2. The ultimate individual unit of magnetism in any magnet is called
  3. A plank with a box on it at one end is gradually raised about the other end.
  4. The moment of inertia of a rod about an axis through its centre and perpendicular
  5. Length of a string tied to two rigid supports is 40 cm. Maximum length