Multiple Choice Questions on Water Supply & Sanitary Engineering
Alum is chemically
(a) Copper sulphate
(b) Aluminium sulphate
(c) Ferrous sulphate
(d) Ferric chloride
Biochemical Oxygen Demand (B.O.D) of safe drinking water must be
(a) Nil
(b) 5
(c) 10
(d) 15
Acidity in water is caused due to
(a) Free CO2
(b) Iron sulphate
(c) Aluminium Sulphate
(d) All the above
What happens due to Corrosion of a pipe?
(a) reduces its carrying capacity
(b) adds colour to water
(c) adds odoour to water
(d) All of the above
The maximum permissible value of Nitrate in public water supplies, is
(a) 5 ppm
(b) 100 ppm
(c) 200 ppm
(d) 45 ppm
In distribution pipe, drain valve is provided at
(a) lower point
(b) higher point
(c) Junction point
(d) any where
The population growth curve is
(a) S-shaped curve
(b) prabolic curve
(c) circular curve
(d) straight line
Which type of hardness is removed by boiling of water?
(a) Calcium sulphate
(b) Magnesium sulphate
(c) Calcium nitrate
(d) Calcium bicarbonate
Disifection of drinking water is done to remove
(a) odour
(b) bacteria
(c) turbidity
(d) colour
Aeration of water is done to remove
(a) odour
(b) colour
(c) bacteria
(d) hardness
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