Civil Engineering MCQs

Page No. 179

In chlorination, with the rise in temperature of water, death rate of bacteria____________?


a increases


b decreases


c remains unaffected


dnone of the above


View Answer increases

The suitable method for disinfection of swimming pool water is________________?


aultra violet rays treatment


b lime treatment


cby using potassium permanganate


dchlorination



The percentage of chlorine in fresh bleaching powder is about________________?


a10 to 15


b20 to 25


c30 to 35


d40 to 50


View Answer 30 to 35

Chlorine demand of water is equal to________________?


aapplied chlorine


b residual chlorine


c sum of applied and residual chlorine


ddifference of applied and residual chlorine



The rate of Alteration of pressure filters is_________________?


aless than that of slow sand filters


b in between the filtration rate of slow sand filters and rapid sand filters


c greater than that of rapid sand filters


dequal to that of slow sand filters



The percentage of filtered water, which is used for backwashing in rapid sand filters, is about______________?


a0.2 to 0.4


b 0.4 to 1.0


c2 to 4


d5 to 7


View Answer 2 to 4

Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters. Reason R : The sand used in slow sand filters is finer than that in rapid sand filters. Select your answer based on the coding system given below?


aAssertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters. Reason R : The sand used in slow sand filters is finer than that in rapid sand filters. Select your answer based on the coding system given below?


bBoth A and R are true but R is not the correct explanation of A


c A is true but R is false


d A is false but R is true



The effective size of sand particles used in slow sand filters is_______________?


a 0.25 to 0.35 mm


b 0.35 to 0.60 mm


c 0.60 to 1.00 mm


d 0.60 to 1.00 mm


View Answer 0.25 to 0.35 mm

In water treatment, rapid gravity filters are adopted to remove_______________?


adissolved organic substances


b dissolved solids and dissolved gases


cfloating solids and dissolved inorganic solids


dbacteria and colloidal solids



The alum, when added as a coagulant in water_______________?


adoes not require alkalinity in water for flocculation


b does not affect pH value of water


c increases pH value of water


ddecreases pH value of water



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