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37.

The alum, when added as a coagulant in water                        
A. does not require alkalinity in water for flocculation B. does not affect pH value of water
C. increases pH value of water D. decreases pH value of water



38.

The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about                        
A. 0.01 to 0.05 ppm B. 0.05 to 0.5 ppm
C. 0.5 to 1.0 ppm D. 1.0 to 5.0 ppm



39.

The chemical most commonly used to increase speed of sedimentation of sewage is                        
A. sulphuric acid B. copper sulphate
C. lime D. sodium permanganate




40.

The commonly used material for water supply pipes, which has the properties of being strong, not easily corroded and long life but is heavy and brittle is                        
A. steel B. cast iron
C. copper D. reinforced cement concrete



41.

The depression of water table in a well due to pumping will be maximum
where R is the radius of influence                        
A. at a distance R from the well B. close to the well
C. at a distance R/2 from the well D. none of the above



42.

The design discharge for the combined sewer system shall be taken as                        
A. equal to rainfall B. rainfall + DWF
C. rainfall + 2 DWF D. rainfall + 6 DWF



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