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UPSC Civil Service Exam Questions - Engineering

Q1:

The following data pertain to a waste-water sample :
Initial D.O. = 8 mg/l
Final D.O. = 2 mg/l
Dilution = 1%.
The B.O.D. of the given wastewater sample is

A 600 mg/l

B 6 mg/l

C 0.6 mg/l

D 1 mg/l

ANS:A - 600 mg/l

= (initial-final)/dilution.
= (8-2)/(1/100)=600mg/l.