Q. Hardness of water is caused due to

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Q. Flow through period, in sedimentation tanks, is

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Q. Normal values of overflow rate for plain sedimentation tank, is

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Q. If p is total internal pressure, d is diameter of pressure conduit and t is thickness of conduit, the Hoop's stress is

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Q. The force which develops in a pressure conduit supported on trestles, is

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Q. After cleaning a slow sand filter, the filtered water is not used for

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Q. A pressure conduit laid under ground, may not be subjected to

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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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