A. 10% less
B. 20% less
C. 10% more
D. 20% more
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Related Mcqs:
- Specific weight of sea water is more that of pure water because it contains ________________?
A. dissolved air
B. dissolved salt
C. suspended matter
D. all of the above
E. heavy water - The pH value of fresh sewage is usually ______________________?
A. Equal to 7
B. More than 7
C. Less than 7
D. Equal to zero - Fresh sewage may become stale in_________________?
A. One hour
B. Two to three hours
C. Three to four hours
D. Six hours - Fresh sewage is generally_____________________?
A. Alkaline
B. Acidic
C. Highly decomposed
D. A source of objectionable odour - The surface tension of mercury at normal temperature compared to that of water is____________________?
A. more
B. less
C. same
D. more or less depending on size of glass tube
E. none of the above. - The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is_____________________?
A. 0.05552 cumec
B. 0.05554 cumec
C. 0.05556 cumec
D. 0.0556 cumec - weight of water, the hydraulic mean depth of the sewer and the bed slope w is the unit of the sewer, then the tractive force exerted by flowing water, is________________________?
A. w r S S
B. w r1/2
C. w r S
D. w r2/3 - For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed________________?
A. 3 ppm
B. 4 ppm
C. 5 ppm
D. 10 ppm - The factor responsible for purification of sewage in river is________________?
A. Hydrology
B. Dissolved oxygen in water
C. Temperature
D. All the above - A well oxidized sewage contains nitrogen mainly as___________________?
A. Nitrates
B. Nitrites
C. Free ammonia
D. None of these
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