The GATE Grind

GATE 2022 AR — Planning – Question 41

Infrastructure, Services and Utilities · Water quality and testing · 2 marks · Multiple select

Under URDPFI 2015 drinking-water quality requirements, which acceptable-limit statements are correct?

  1. Colour at most 5 Hazen units
  2. Turbidity at most 1 NTU
  3. pH at least 10
  4. Total dissolved solids at most 500 mg/L

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Show answer and explanation

Correct answer: (A) Colour at most 5 Hazen units; (B) Turbidity at most 1 NTU; (D) Total dissolved solids at most 500 mg/L

Explanation

The acceptable limits in the cited table include colour 5 Hazen units, turbidity 1 NTU and TDS 500 mg/L, A, B, D. Drinking-water pH is specified as a bounded near-neutral range, not a minimum of 10, so C is wrong. Acceptable and permissible-in-absence-of-alternative limits must not be mixed.

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