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GATE 2022 ES – Question 48

Air and Noise Pollution · Atmosphere and Air Quality · 2 marks · Multiple select

Temperature–height profiles P, Q, R are shown. For ground-level emissions, select correct statements.

Diagram for GATE 2022 ES question 48
  1. P unstable with greater dispersion
  2. Q subsidence inversion with greater dispersion than P
  3. Q elevated inversion with less dispersion than P
  4. R subsidence inversion with less dispersion than P

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Show answer and explanation

Correct answer: (A) P unstable with greater dispersion; (D) R subsidence inversion with less dispersion than P

Explanation

P decreases steeply with height and is superadiabatic, promoting vertical dispersion. R has an elevated layer where temperature increases upward, a subsidence-inversion cap that restricts mixing. Q has a surface inversion; calling it an elevated inversion is incorrect. Thus **A, D**.

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