The GATE Grind

GATE Water and Waste Water Quality and Treatment: Water quality standards, parameters and water quality index – Previous Year Questions

5 GATE previous year questions on Water quality standards, parameters and water quality index (Water and Waste Water Quality and Treatment, Civil Engineering) with answers and explanations, from every paper.

  1. GATE 2023 CE (CE1) Q27 (1 mark, Multiple select) – Identify the waterborne diseases caused by viral pathogens:
  2. GATE 2025 CE (CE2) Q49 (2 marks, Multiple select) – A compound has a general formula C aH bO cN d and molecular weight 187. A 935 mg/l solution of the compound is prepared in distilled deionized water.…
  3. GATE 2025 CE (CE2) Q61 (2 marks, Numerical answer) – The analyses results of a water sample are given below. The non-carbonate hardness of the water (in mg/L) as CaCO 3 is (in integer). Ca2+ = 150 mg/L…
  4. GATE 2025 CE (CE1) Q44 (2 marks, Multiple select) – MgCl 2 and CaSO 4 salts are added to 1 litre of distilled deionized water and mixed until completely dissolved. Total Dissolved Solids (TDS)…
  5. GATE 2026 CE (CE2) Q42 (2 marks, Multiple choice) – The 2.4 ml of raw sewage is diluted to 240 ml. The Dissolved Oxygen (DO) of the diluted sample at the beginning of Biochemical Oxygen Demand (BOD)…