Q. The most efficient cross section of sewers in a separate sewerage system is

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Q. 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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Q. The intensity of rain is expressed in

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Q. 1000 kg of sewage contains

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Q. The normal values of over flow rates for sedimentation tanks using coagulent, ranges between

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Q. Pick up the incorrect statement from the following for allowing workers to enter sewers

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Q. In a grit chamber of a sewage treatment plant,

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Q. The rate of accumulation of sludge per person per year, is

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Q. The disintegrating pump in which solid matter is broken up before passing out, is

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Q. In areas where light rains are uniformly distributed throughout the year, the type of sewerage system to be adopted is

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Q. For detecting the nitrates in sewage, the colour may be developed by adding

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Q. The formula which accepts the value of rugosity coefficient n = 0.012 to be used in Manning's formula, is given by

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Q. For laying a sewer line in a trench of 2 m width, an offset line is marked on the ground parallel to the given centre line at a distance of

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