Q. Self-cleansing velocity is

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Q. Fresh sewage may become stale in

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Q. The small sewers are cleaned by

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Q. Dry water flow in a combined sewer, is

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Q. Which one of the following tests is used for testing sewer pipes :

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Q. Nitrogen cycle of sewage, is

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Q. In sewers the highest non-scouring velocity is achieved in

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Q. In sewage having fully oxidised organic matter, the nitrogen exists in the form of

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Q. It is customary to design a sewer for D.W.F. on the basis of

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Q. During preliminary treatment of a sewage

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Q. Pick up the correct statement from the following :

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Q. The most dangerous pollutant in vehicular emissions is

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Q. If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is

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Q. The clarigesters are

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Q. Rate of flow of sewage is generally assumed

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Q. Maximum permissible velocity 1.5 m/sec, is adopted in drains

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Q. For design purposes, the normal rate of infiltration of ground water into the sewer, is

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Q. The effluent of a septic tank is

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Q. 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

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Q. The detention period for plain sedimentation water tanks, is usually

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