Q. A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of

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Q. Assertion (A) : A free board of 0.3 m is provided above the top sewage line in septic tanks. Reason (R) : It helps to accommodate the scum in the septic tank.

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Q. Pick up the incorrect statement from the following :

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Q. Pick up the correct statement from the following :

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Q. You are asked to design sewer pipes of diameters 0.4 m to 0.9 m at maximum flow, you will assume the sewer flow running at

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Q. For sewer mains of 0.5 to 1 m diameter, the ratio of maximum daily sewage flow to the average daily sewage flow is assumed

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Q. D is the diameter of a circular sewer and α is the side of a square section sewer. If both are hydraulically equivalent, the relationship which holds good, is

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

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Q. The suitable cross-section of sewers to carry combined flow, is

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Q. If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity, is

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Q. In 1000 kg of sewage, the total solids approximate

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Q. Pathogens (or pathogentic bacterias) in water may cause

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Q. Sewer manholes are generally provided at

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Q. The sewers

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Q. Before discharging the foul sewage into rivers, it is generally treated by

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Q. The settlement of a particle in sedimentation tank, is affected by

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Q. If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is

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Q. Oxidation process results in the formation of

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Q. Dry weather flow is :

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Q. As compared to fresh river water, sea water contains oxygen

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