If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is_________________?

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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...