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UPSC Civil Service Exam Questions - Engineering

Q1:

Self-purification of running streams may be due to

A sedimentation, oxidation land coagulation

B dilution, sedimentation and oxidation

C dilution, sedimentation and coagulation

D dilution, oxidation and coagulation

ANS:B - dilution, sedimentation and oxidation

Option (b) is correct. The major physical processes involved in self purification of watercourses are dilution, sedimentation and resuspension, gas transfer, and heat transfer. Gas transfer includes oxidation.