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UPSC Civil Service Exam Questions - Engineering

Q1:

The entry of foul smelling gases into the house coming from the sewers can be prevented by

A providing water seals for all the fixtures

B providing water seals for all the fixtures and a vent pipe in the plumbing system

C providing sufficient vent pipes in the plumbing system

D exhaust fans

ANS:B - providing water seals for all the fixtures and a vent pipe in the plumbing system

Yes, I agree too. Water seals is right, but we can also say that the vent pipe system must be enough and fixed.