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UPSC Civil Service Exam Questions - Engineering

Q1:

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

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

B BOD test is easier to perform and gives more reliable result

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

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

ANS:B - BOD test is easier to perform and gives more reliable result

I think it should be C.