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GATE 2026 CE (CE1) – Question 22

Water and Waste Water Quality and Treatment · Unit processes and operations · 1 mark · Multiple choice

The settling velocity of inorganic particles in the sedimentation tank of a water treatment plant is governed by

  1. Darcy's law
  2. Stokes' law
  3. Dupuit's law
  4. Bernoulli's law

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Show answer and explanation

Correct answer: (B) Stokes' law

Explanation

The settling of small discrete particles in still water is described by Stokes' law. Darcy's law and Dupuit's law are about flow through porous media, and Bernoulli's law is about energy in flowing fluid.