A. Circular septic tanks
B. Rectangular septic tanks
C. Circular Imhoff double tanks with bottom hoppers
D. Circular Imhoff double storey tanks without bottom hoppers
Related Mcqs:
- The asbestos cement sewers are_________________?
A. Light in weight
B. Not structurally strong to bear large compressive stress
C. Susceptible to corrosion by sulphuric acid
D. All the above - Units of surface tension are_________________?
A. energy/unit area
B. distance
C. both of the above
D. it has no units
E. none of the above - Dimensions of surface tension are_________________?
A. MlL°T2
B. MlL°Tx
C. MlL r2
D. MlL2T2
E. MlL°t - A liquid would wet the solid, if adhesion forces as compared to cohesion forces are_________________?
A. less
B. more
C. equal
D. less at low temperature and more at high temperature
E. there is no such criterion - The drainage area of a town is 12 hectares. Its 40% area is hard pavement ( K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula Ps = 900/(t + 60) the maximum run off is__________________?
A. 0.10 cumec
B. 0.12 cumec
C. 0.15 cumec
D. 0.20 cumec - In trickling filter, B.O.D. is reduced to___________________?
A. 30 to 40%
B. 40 to 60%
C. 60 to 80%
D. 80 to 90% - Which one of the following gases is most significant as air pollutant ?
A. Carbondioxide
B. Oxygen
C. Nitrogen
D. Sulphur-dioxide - The liquid wastes from kitchens, bath rooms and wash basins, is not called________________?
A. Liquid waste
B. Sullage
C. Sewage
D. None of these - House connections to the laterals is generally made by___________________?
A. R.C.C.
B. P.C.C.
C. Cast iron
D. Glazed stonewares - The gradient of sewers depends upon_________________?
A. Velocity of flow
B. Diameter of the sewer
C. Discharge
D. All the above
