Water Supply Engineering - Water Supply Engineering objective questions and answers

26.  Excessive aeration for water treatment may result into

   A. nothing

   B. Better quality of water

   C. Corrosion of metal

   D. Excessive ductility

27.  Which of the following is the first stage in the treatment of water?

   A. Filteration

   B. Coagulation

   C. Mixing

   D. Sedimentation

28.  The colour of water measured on

   A. Turbidity scale

   B. Platinum hardness scale

   C. Calcium hardness

   D. Threshold scale

29.  Taste and colour of Water is due to

   A. Manganese

   B. Iron oxide

   C. Calcium

   D. All of the above

30.  Presence of lead in water

   A. Changes its colour

   B. Causes turbidity

   C. Causes alkalinity

   D. None of the above

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