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If a mass of moist air contained in a closed metallic vessel is heated, then its 

  1. Relative humidity decreases.
  2. Relative humidity increases.
  3. Specific humidity increases.
  4. Specific humidity decreases.
in Thermodynamics 24.6k points
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Ans: A

This case can be considered as  a case of sensible heating, hence the relative humidity decreases keeping the specific humidity constant and an increase in DBT (dry bulb temperature)
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