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GATE 2025 AR — Planning – Question 36

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

Which methods desalinate water?

  1. Reverse osmosis
  2. Activated-sludge process
  3. Incineration
  4. Distillation

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Show answer and explanation

Correct answer: (A) Reverse osmosis; (D) Distillation

Explanation

Reverse osmosis separates water through a membrane that rejects dissolved salts; distillation evaporates and condenses water while salts remain behind. Thus A, D. Activated sludge primarily treats biodegradable wastewater constituents, and incineration burns waste rather than producing desalinated water.

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