The GATE Grind

GATE Water and Waste Water Quality and Treatment: Water requirement, distribution system and drinking water treatment – Previous Year Questions

4 GATE previous year questions on Water requirement, distribution system and drinking water treatment (Water and Waste Water Quality and Treatment, Civil Engineering) with answers and explanations, from every paper.

  1. GATE 2024 CE (CE1) Q61 (2 marks, Numerical answer) – A water treatment plant treats 25 MLD water with a natural alkalinity of 4.0 mg/L (as CaCO 3). It is estimated that, during coagulation of this water,…
  2. GATE 2025 CE (CE2) Q34 (1 mark, Numerical answer) – Free residual chlorine concentration in water was measured to be 2 mg/l (as Cl 2). The pH of water is 8.5. By using the chemical equation given below,…
  3. GATE 2025 CE (CE1) Q21 (1 mark, Multiple choice) – Fecal Coliform (FC) concentration in river water was measured as 10780 cfu/100 ml. The FC concentration after the conventional water treatment, but…
  4. GATE 2025 CE (CE1) Q32 (1 mark, Multiple select) – Aeration is employed as a treatment option for the removal of several pollutants from contaminated water. Identify the pollutant(s), where aeration is…