TGPSC HMWSSB Manager 2015 Paper 2 · Question 90

Question 90 of the TSPSC Manager (Engineering), HMWSSB, 2015: Paper 2 (Civil Engineering) (1 November 2015). Try it first, then open the answer and explanation.

1. Manager 2015 Paper 2 (Civil) · Q90 · Environmental Engineering · Sewerage & Wastewater Treatment

   The relative stability of a sewage sample whose dissolved oxygen levels equals the total oxygen required to satisfy its BOD is

   1. Zero
   2. 1%
   3. 100%
   4. Infinity
   Show answer

   Answer: (3) 100%

   Relative stability is the oxygen available in the sample expressed as a percentage of the oxygen needed to satisfy its BOD, so when the two are equal the relative stability is 100%.

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