21. Standard EDTA (ethylene diamine tetra acetic acid) solution is used to determine the
22. The hourly variation factor is usually taken as
23. Disinfection of water results in
24. If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to
25. Laying of sewers is usually done with the help of
26. The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by
27. As compared to shallow wells, deep wells have
28. As compared to cast iron pipes, steel pipes are
29. In water treatment, rapid gravity filters are adopted to remove
30. In facultative stabilization pond, the sewage is treated by
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