Q. The rate of accumulation of sludge in septic tanks is recommended as

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Q. If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is

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Q. If D is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is

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Q. Pick up the correct statement from the following :

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Q. In olden days the type of section adopted in trunk and out fall sewers was

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Q. For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed

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Q. In a fully mechanised composting plant, involves

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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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