Engineering :: Public Health Engineering
301.
When the sewage is to be distributed over a level area surrounded by dykes (i.e. trenches), the mothod of sewage used is called
A. flooding
B. surface irrigation
C. ride and furrow
D. spray irrigation
Answer: A
Explanation:
302.
Which of the following statement is wrong?
A. For land disposal, large areas with preferably sandy types of soil are required.
B. The land disposal requires either preliminary or primary treatment of sewage.
C. The land disposal saves the inland stream from getting polluted by sewage.
D. none of the above
Answer: D
Explanation:
303.
The natural process in which the oxygen of water of streams is consumed by sewage and at the same time, it is replenished (filled again) by the atmosphere, is known as
A. oxidation
B. deoxidation
C. self purification
D. sedimentation
Answer: C
Explanation:
304.
The minimum dissolved oxygen required in water to save the aquatic life is
Answer: C
Explanation:
305.
The amount of oxygen required for the biological decomposition of dissovled organic solids to occur under aerobic conditions is called bio-chemical oxygen demand (B.O.D.)
Answer: A
Explanation:
306.
The bio-chemical treatment of sewage effluent is a process of
A. oxidation
B. deoxidation
C. self purification
D. sedimentation
Answer: A
Explanation:
307.
The amount of oxygen consumed by sewage from an oxidising agent like potassium dichromate is termd as
A. bio-chemical oxygen demand (B.O.D.)
B. chemical oxygen demand (C.O.D.)
C. relative stability
D. none of these
Answer: B
Explanation:
308.
The percentage ratio of the oxygen available in sewage to the oxygen required to satisfy one stage of bio-chemical oxygen demand (B.O.D.) is termed as
A. chemical oxygen demand
B. oxygen consumed
C. relative stability
D. bio-oxygen demand
Answer: C
Explanation:
309.
The sewage should be disposed off without causing odour and nuisance.
Answer: A
Explanation:
310.
Aerobic bacterias takes place in the
Answer: A
Explanation:
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