GATE Water and Wastewater Treatment and Management: Water Treatment – Previous Year Questions
11 GATE previous year questions on Water Treatment (Water and Wastewater Treatment and Management, Environmental Science and Engineering) with answers and explanations, from every paper.
- GATE 2021 ES Q19 – What drives Type-I settling in a sedimentation tank?
- GATE 2021 ES Q25 – Among the listed pH values, where is chlorine most effective as a water disinfectant?
- GATE 2021 ES Q33 – A flocculation tank has velocity gradient800 s⁻¹,volume 40 m³,water viscosity9×10⁻⁴ N s/m². Find theoretical mixing power in kW, rounded to an…
- GATE 2022 ES Q22 – River water has pH4 and suspended solids100 mg/L. With alum, which coagulation mechanism is expected?
- GATE 2022 ES Q61 – Water filters at .002 m/s through .67 m of uniform .4 mm spherical sand, SG2.65,porosity .35. Water density998.2 kg/m³,viscosity .001002 Pa s. Use…
- GATE 2023 ES Q35 – Clay particles of diameter 75 µm and specific gravity2.65 settle twice as fast as metal particles of specific gravity8. Under discrete laminar…
- GATE 2023 ES Q56 – A 100 mL flask contains .12 mg/L geosmin. Carbon follows Freundlich q=2.6C.73 mg adsorbate/mg adsorbent, where C is equilibrium mg/L. Find carbon dose…
- GATE 2024 ES Q18 – Match rapid-filter mechanisms i Straining, ii Sedimentation, iii Interception, iv Diffusion with P Particles caught in pores, Q Large/heavy particles…
- GATE 2025 ES Q45 – Which options remove solids from water? Select all that apply.
- GATE 2026 ES Q44 – Which statements about reverse osmosis (RO) are true? Select all that apply.
- GATE 2026 ES Q45 – Which statements about coagulation–flocculation are true? Select all that apply.