Q. The period of cleaning of a slow sand filter, is usually

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Q. Percussion drilling is unsuitable in

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Q. Disinfection of water with ozone is not good because

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Q. An earth formation which, although porous and capable of absoring water does not provide an appreciable supply to wells, is known as

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Q. Mathamoglobinemia, or blue baby disease is caused due to

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Q. The main process to purify water by filtration, is

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Q. Hard water contains

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Q. The main disadvantage of hard water, is

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Q. An area is declared drought affected if its mean rainfall is less than

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Q. The best quality of filter material is obtained from quartzite if it does not loose weight when placed in hydro-chloric acid for 24 hours, more than

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Q. If discharge of a pump is 0.16 cumecs, the economic diameter of pipe, is

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Q. The water level in an open well was depressed by pumping 2.5 m and recuperated 2.87 m in 3 hours and 50 minutes. The yield of the well per minute is

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Q. Rapid gravity filter can only remove turbidity of water upto

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Q. Pick up the correct statement from the following :

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Q. The best process of disinfection of public water supply, is by

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Q. Pick up the correct statement from the following :

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Q. While determining the yield of open wells by the pumping test

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Q. Increase in population of a rapidly growing city, may be estimated by

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Q. Pick up the correct statement from the following regarding the pressure conduits :

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Q. The standard B.O.D. at 20°C, is taken for the consumption in

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