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Environmental Engineering - Interview Questions and Answers

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16. Sewage treatment units are normally designed for
A. 5-10 years
B. 15-20 years
C. 30-40 years
D. 40-50 years
Explanation:
17. Select the correct statement.
A. 5 day BOD is the ultimate BOD.
B. 5 day BOD is greater than 4 day BOD keeping other conditions same.
C. 5 day BOD is less than 4 day BOD keeping other conditions same.
D. BOD does nof depend on time.
Explanation:
18. Facultative bacteria are able to work in
A. presence of oxygen only
B. absence of oxygen only
C. presence as well as in absence of oxygen
D. presence of water
Explanation:
19. The rate of BOD exerted at any time is
A. directly proportional to BOD satisfied
B. directly proportional to BOD remain-ing ,
C. inversely proportional to BOD satisfied
D. inversely proportional to BOD re-maining
Explanation:
20. The most commonly used sewer under culverts is
A. circular brick sewer
B. circular cast iron sewer
C. semi-elliptical sewer
D. horse-shoe type sewer
Explanation:
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