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  1. Oil spreads over the surface of water where as water does not spread
  2. A ship of mass 3 x 10⁷ kg initially at rest is pulled by a force of 5 x 10⁴ N through
  3. The radius of the first orbit of the hydrogen atom is a₀. The radius of the second orbit
  4. Which series of hydrogen spectrum corresponds to ultraviolet region?
  5. The operation of a nuclear reactor is said to be critical, if the multiplication