Q. For controlling algae, the most commonly used chemical, is

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Q. The head against which the motor works for lifting water, is

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Q. An ideal sand for filters should be

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Q. The maximum non-verticality of the bore of a well 200 m deep, may be permitted up to

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Q. By adding 1 ml of orthotolidine solution to 100 ml chlorinated water taken after contact period, the residual chlorine makes the colour of solution

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Q. From the surface of reservoir, evaporation may be minimised by sprinkling

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Q. Gravity conduits are generally in the form of

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Q. The intake opening is generally covered by a screen to prevent entry of debris etc. and its level is kept

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Q. In rapid sand filters the ratio of length and diameter of the lateral, should not be greater than

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Q. The maximum permissible hardness for public supplies is

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Q. Plain chlorination is used for water

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Q. Underground water is obtained from

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Q. Pick up the correct statement from the following :

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Q. Pressure relief valves are provided in water mains

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Q. Pick up the incorrect statement from the following :

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Q. The percentage of chlorine in fresh bleaching powder is roughly

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Q. Higher yield may be expected from

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Q. Pick up the correct statement from the following :

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Q. The valve fitted closely in a recess against an opening in a pipe, is generally

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Q. For calculation of economical diameter D of a pipe in metres for a discharge Q to be pumped in cumecs, Lea suggested the empirical formula

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