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GATE 2021 AR – Question 41

Infrastructure, Services and Utilities · Water treatment · 2 marks · Multiple choice

Match impurities P fine suspended matter, Q pathogenic bacteria, R colour/odour/taste, S floating leaves with processes 1 aeration, 2 plain sedimentation, 3 sedimentation with coagulation, 4 screening, 5 disinfection.

  1. P–2;Q–5;R–3;S–4
  2. P–3;Q–4;R–1;S–2
  3. P–1;Q–4;R–3;S–2
  4. P–3;Q–5;R–1;S–4

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Correct answer: (D) P–3;Q–5;R–1;S–4

Explanation

Coagulation aids removal of fine suspended particles(3); disinfection targets pathogens(5); aeration removes relevant volatile taste/odour-causing constituents(1); screens remove floating debris(4). Thus D. The broad colour/odour/taste grouping is the source’s simplified match; aeration does not remove every dissolved colour compound.

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