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  1. After 300 days, the activity of a radioactive sample is 5000 dps
  2. In an L-C-R series resonant circuit, the capacitance is changed from C to 4C.
  3. The decay constant of a radio isotope is λ. If A₁ and A₂ are its activities at time
  4. Sand is being dropped on a conveyor belt at the rate of M kg/s. The force necessary
  5. A cyclist is riding with a spped of 27 km/h.As he approaches a circular turn