Q. Alkalinity in water may be caused due to

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Q. Open channels supported over tres-les, are generally known as

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Q. For least effect on the water table, the tube wells must be dug one in every

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Q. In plain sedimentation tanks under normal conditions, impurities are removed upto

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Q. Rapid sand filter

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Q. Pick up the correct statement from the following :

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Q. Rapid gravity filters can remove bacterial impurities up to a maximum of

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Q. Cast iron pipes

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Q. Run off is the quantity of water which flows

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Q. Efficiency of removing bacterias from raw water by a slow sand filter, is

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Q. De-chlorination is followed by

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Q. The bed slope in slow sand filters, is generally kept

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Q. When gravity and pumping systems of water distribution are adopted, the type of distribution reservoir, is

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Q. The average domestic consumption under normal conditions in an Indian city per day per person, is

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Q. Air inlet valve in water mains, is generally provided at

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Q. The duration of contact of chlorine with water before it is served to the first consumer, should be at least

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Q. The diameter of pipes in bath rooms and lavatories in domestic water supply, is

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Q. Pick up the incorrect statement from the following :

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Q. m and n are monsoon duration factor and catchment factor respectively. If P is yearly rainfall in cm, runoff can be calculated by

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Q. Water may contain

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