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Environmental Engineering - Interview Questions and Answers

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11. The pathogens can be killed by
A. nitrification
B. chlorination
C. oxidation
D. none of the above
Explanation:
12. The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is
A. 1 ppm
B. 4 ppm
C. 10 ppm
D. 40 ppm
Explanation:
13. If the coliform bacteria is present in a sample of water, then the coliform test to be conducted is i) presumptive coliform test ii) confirmed coliform test iii) completed coliform test The correct answer is
A. only (i)
B. both (i) and (ii)
C. both (i) and (iii)
D. all (i), (ii) and (iii)
Explanation:
14. The means of access for inspection and cleaning of sewer line is known as
A. inlet
B. manhole
C. drop manhole
D. catch basin
Explanation:
15. The characteristics of fresh and septic sewage respectively are
A. acidic and alkaline
B. alkaline and acidic
C. both acidic
D. both alkaline
Explanation:
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