Q. For the COD test of sewage, organic matter is oxidised by K₂Cr₂0₇ in the presence of

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Q. In R.C. sewer pipes, the percentage longitudinal reinforcement to the cross-sectional area of concrete is kept

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Q. The dimensions of a rectangular settling tank are : length 24 m, width 6 m and depth 3 m. If 2 hour detention period for tanks is recommended, the rate of flow of sewage per hour, is

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Q. The screens are fixed

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Q. In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is

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Q. Pick up the in-correct statement from the following :

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Q. The minimum recommended diameter of sewers, is

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Q. Aerobic bacterias

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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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