Q. In trickling filter, B.O.D. is reduced to

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Q. Which one of the following gases is most significant as air pollutant

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Q. Which one of the following statements regarding septic tanks is wrong :

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Q. In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient,

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Q. If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is

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Q. The average temperature of sewage in India, is

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Q. The most widely used pump for lifting sewage is

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Q. The sewer which resists sulphide corrosion, is

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Q. Ventilating shafts are provided to a sewer line at every

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Q. Which one of the following part of human body withstands minimum radiation

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Q. The water carried sewerage system removes

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Q. Stoneware sewers are available in size

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Q. The sludge does not contain waste water from

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Q. Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for

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Q. 5 days-biochemical oxygen demand (BOD₅) is taken at a temperature of

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Q. Water content of sewage is about

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Q. Imhoff cone is used to measure

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Q. For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is

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Q. If the peak discharge of a storm water drain (S.W. Drain) is e.xpected to exceed 150 cumecs, the free board to be provided, is

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Q. PH value of sludge during alkaline regression stage, is

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