A. Bacterias
B. Suspended solids
C. Sediments
D. Hardness
Related Mcqs:
- Primary treatment of sewage consists of removal of__________________?
A. Large suspended organic solids
B. Oil and grease
C. Sand and girt
D. Floating materials - Removal of oil and grease from sewage, is known____________________?
A. Screening
B. Skimming
C. Filtration
D. None of these - Surface tension has the units of____________________?
A. newtons/m
B. newtons/m
C. new tons/m
D. newtons
E. newton m - Rain drops are spherical because of____________________?
A. viscosity
B. air resistance
C. surface tension forces
D. atmospheric pressure
E. none of the above - Bernoulli equation deals with the law of conservation of____________________?
A. mass
B. momentum
C. energy
D. work
E. force - 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 - As compared to fresh river water, sea water contains oxygen_________________?
A. 10% less
B. 20% less
C. 10% more
D. 20% more - 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 - In septic tanks, decomposition of organic bacteria, is done by_____________________?
A. Anaerobic bacteria
B. Aerobic bacteria
C. Both types of bacterias
D. None of these - The laying of sewers is done with____________________?
A. Magnetic compass
B. Theodolite
C. Level
D. Clinometer
