UPSC Civil Service Exam Questions - Civil Engineering Questions and Answers

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BOD is preferred to COD as an index of sewage concentration because

BOD represents both carbonaceous and nitrogenous organic matter while COD may indicate carbonaceous matter only

BOD test is easier to perform and gives more reliable result

BOD relates specifically to putrescible organic matter which is the most objectionable sewage constituent

COD relates to the impurities which can only removed by chemical treatment which is expensive

Answer : Option B

Explanation :

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