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  1. If v is the speed of sound in air, then the shortest length of the closed pipe
  2. A radiactive substance emits 100 beta particles in the first 2s and 50 beta
  3. Oil spreads over the surface of water where as water does not spread
  4. If 20% of a radiactive element decays in 10 days, then amount of original material left
  5. Two identical charges repel each other with a force equal to 10 mgwt they are 0.6 m