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GATE 2018 CE (CE2) – Question 25

Air Pollution and Municipal Solid Wastes · Air pollution: pollutants, sources, impacts, control and air quality index · 1 mark · Multiple choice

Group I shows atmospheric temperature profiles P, Q, R, S; Group II shows smoke-stack plume patterns 1–4. In Group I, dashed lines show the dry adiabatic lapse rate; horizontal and vertical axes denote temperature and altitude. Match the groups.

Diagram for GATE 2018 CE (CE2) question 25
  1. P–1, Q–2, R–3, S–4
  2. P–1, Q–2, R–4, S–3
  3. P–1, Q–4, R–3, S–2
  4. P–3, Q–1, R–2, S–4

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Show answer and explanation

Correct answer: (A) P–1, Q–2, R–3, S–4

Explanation

Superadiabatic unstable air produces looping (P→1). Neutral adiabatic conditions give coning (Q→2). A temperature inversion suppresses vertical motion and gives fanning (R→3). An inversion above unstable lower air traps upward dispersion and promotes fumigation (S→4). Thus **A**.