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  1. The order of distance of an electron revolving in an atom from nucleus is
  2. If a small sphere is let fall vertically in a large quantity of still liquid of density
  3. A black hole is an object whose gravitational field is so strong that even light
  4. Two lenses of power 15 D and -3 D are placed in contact.
  5. To what temperature should the hydrogen at room temperature (27°C) be heated at constant