Q. The presence of free ammonia in sewage, is detected by

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Q. The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known

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Q. The standard B.O.D. of water is taken for

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Q. The digested sludge from septic tanks, is removed after a maximum period of

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Q. For providing an Indian type W.C., the R.C.C. slabs in the toilet portion

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Q. The gradient of sewers depends upon

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Q. The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is

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Q. The drop man holes are generally provided in sewers for

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Q. For large sewers, maximum distance between manholes may be

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Q. The first stage of neutral process of sludge digestion, is

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Q. Lead acetate test in sewer manhole is done to test the presence of

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Q. Dried sewage after treatment is used as

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Q. The use of coarse screens for the disposal of sewage, may be dispensed with by

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Q. Lead caulked joints are used for laying

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Q. Pick up the correct statement from the following :

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Q. For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed

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Q. At the junction of sewers

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Q. Primary treatment of sewage consists of removal of

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Q. If the depth of flow in a circular sewer is 1/4th of its diameter D, the wetted perimeter is

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Q. The maximum diameter of sewers adopted in the designs is

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