Civil Engineering - UPSC Civil Service Exam Questions - Discussion

38. 

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

Answer: Option B

Explanation:

No answer description available for this question.

Sadashiva said: (Aug 23, 2018)  
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.

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