The average salinity of sea water is
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1) Knot is a unit of speed of which of the following?
2) Brass gets discoloured in air because of the presence of which of the following gases in air?
3) Heavy water is
4) Which radioactive pollutant has recently drawn to public, due to its occurrence in the building material?
5) 'No two electrons in an atom can have the same set of four quantum numbers' is