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UPSC Combined Geo-Scientist

Chemist

  • 2 objective papers
  • 120 questions each
  • 2 h per paper
  • 100 + 300 marks

Prelims Paper I covers general studies.

UPSC Combined Geo-Scientist, Prelims · 2025 · Paper I, General Studies · Q15 of 120

Geo-Scientist Prelims 2025 General Studies Q15: The saturation vapour pressure at 300 K is 3·6 kPa and the gas…

QuestionThermal physics / humidity

The saturation vapour pressure at 300 K is 3·6 kPa and the gas constant \(R\) is 8·3 J/(K-mol). The mass of water vapour per m³ of air at temperature 300 K and relative humidity 50% is

  1. (a) 13 g
  2. (b) 26 g
  3. (c) 52 g
  4. (d) 39 g

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