Q. By boiling water, hardness can be removed if it is due to

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Q. For determining the velocity of flow of underground water, the most commonly used non-empirical formula is

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Q. The least thickness of class B cast iron (spun) pipe, is

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Q. According to IS : 1172-1963, a minimum of 135 litres of water capita per day, is required for

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Q. The R.L. of ground water table on the sides of a valley is 1505 m whereas R.L. of the stream water is 1475 m. If 60° slope consists of pervious soil between R.L. 1485 m to 1500 m, the gravity spring may be expected at the point of reduced level

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Q. The factor affecting per capita demand, is

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Q. Pick up the incorrect statement from the following. The underground sources of water, is from

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Q. The transitional middle portion of a logistic curve follows

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Q. Pick up the correct statement from the following :

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Q. Pick up the incorrect statement from the following regarding fire hydrants

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Q. The specific retention is least in case of

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Q. B.O.D. of treated water should be

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Q. Manholes along the mains from the source to a city are provided at 500 m intervals in

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Q. The population growth curve is

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Q. Turbidity of raw water is a measure of

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Q. If V is total consumption of water in litres for a population of N individuals, per capita consumption or water allowance for the water supply Q, is given by

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Q. Water supply includes

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Q. The maximum permissible nitrites in public water supplies, is

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Q. A high velocity of wash water is required for

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Q. In distribution pipes, drain valves are provided at

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