The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of
A. 1 mg/liter
B. 10 mg/liter
C. 100 mg/liter
D. 1000 mg/liter
Answer: Option B
Related Questions on Environmental Engineering
The distribution mains are designed for
A. Maximum daily demand
B. Maximum hourly demand
C. Average daily demand
D. Maximum hourly demand on maximum day
Sewage treatment units are designed for
A. Maximum flow only
B. Minimum flow only
C. Average flow only
D. Maximum and minimum flow
A. 4.5 to 6.0
B. 6.5 to 8.0
C. 8.5 to 10.0
D. 10.5 to 12.0
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