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UPSC Civil Service Exam Questions - Engineering

Q1:

What is 5 days 20°C BOD equal to ?

A 3 days 27°C BOD

B 4 days 30°C BOD

C 6 days 32°C BOD

D 7 days 35°C BOD

ANS:A - 3 days 27°C BOD

BOD = L(1-10^-Kd*t).
Kt=K20 (1.047)^T-20.
Let 5 days BOD at 20 = t days BOD at T.
By comparing terms, we will get the answer.