Q. If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of

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Q. The ratio of design discharge to the surface area of a sedimentation tank is called

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Q. In the activated sludge process

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Q. The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is

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Q. In detritus tanks,

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Q. The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is

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Q. In areas where rainy season is limited to a few months, the type of sewerage system recommended is

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Q. Drop manholes are the manholes

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Q. The laying of sewers is done with

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Q. The rational formula for peak drainage discharge, was evolved by

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Q. The sewage treatment in septic tanks is due to

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Q. Stone ware pipes are

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Q. Skimming tanks are

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Q. Assertion (A) : The determination of pH value of sewerage is important. Reason (R) : The efficiency of certain treatment methods depends upon the availability of pH value.

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Q. With self cleansing velocity in sewers

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Q. 1/3rd or 1/4th extra space is left in sewer pipes at maximum discharge for

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Q. Pick up the correct statement from the following :

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Q. Antisyphonage pipe is fitted

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Q. Aerobic activity is maximum

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Q. In sewers designed with self cleansing velocity,

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