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MCQs 1: The effective size of sand particles used in slow sand filters is_______________?

0.25 to 0.35 mm 0.35 to 0.60 mm 0.60 to 1.00 mm 1.00 to 1.80 mm
Answer Explanation

MCQs 2: 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?

Both A and R are true and R is the correct explanation of A Both A and R are true but R is not the correct explanation of A A is true but R is false A is false but R is true
Answer Explanation

MCQs 3: The percentage of filtered water, which is used for backwashing in rapid sand filters, is about______________?

0.2 to 0.4 0.4 to 1.0 2 to 4 5 to 7
Answer Explanation

MCQs 4: The rate of Alteration of pressure filters is_________________?

less than that of slow sand filters in between the filtration rate of slow sand filters and rapid sand filters greater than that of rapid sand filters equal to that of slow sand filters
Answer Explanation

MCQs 5: Chlorine demand of water is equal to________________?

applied chlorine residual chlorine sum of applied and residual chlorine difference of applied and residual chlorine
Answer Explanation

MCQs 6: The percentage of chlorine in fresh bleaching powder is about________________?

10 to 15 20 to 25 30 to 35 40 to 50
Answer Explanation

MCQs 7: The suitable method for disinfection of swimming pool water is________________?

ultra violet rays treatment lime treatment by using potassium permanganate chlorination
Answer Explanation

MCQs 8: In chlorination, with the rise in temperature of water, death rate of bacteria____________?

increases decreases remains unaffected none of the above
Answer Explanation

MCQs 9: The population of a town in three consecutive years are 5000, 7000 and 8400 respectively. The population of the town in the fourth consecutive year according to geometrical increase method is________________?

9500 9800 10100 10920
Answer Explanation

MCQs 10: Disinfection efficiency is________________?

reduced at higher pH value of water unaffected by pH value of water increased at higher pH value of water highest at pH value equal to 7
Answer Explanation

MCQs 11: The major disadvantage of lime soda process of water softening is that_________________?

it is unsuitable for turbid and acidic water huge amount of precipitate is formed which creates a disposal problem the effluent cannot be reduced to zero hardness it is unsuitable for softening the water of excessive hardness
Answer Explanation

MCQs 12: Activated carbon is used for_____________?

disinfection removing hardness removing odours removing corrosiveness
Answer Explanation

MCQs 13: The suitable layout of a distribution system for irregularly growing town is_______________?

dead end system grid iron system radial system ring system
Answer Explanation

MCQs 14: The suitable layout of distribution system for a city with roads of rectangular pattern is______________?

grid iron system dead end system ring system radial system
Answer Explanation

MCQs 15: The method of analysis of distribution system in which the domestic supply is neglected and fire demand is considered is________________?

circle method equivalent pipe method electrical analysis method Hardy cross method
Answer Explanation

MCQs 16: The type of valve which is provided to control the flow of water in the distribution system at street corners and where the pipe lines intersect is_______________?

check valve sluice valve safety valve scour valve
Answer Explanation

MCQs 17: Scour valves are provided ______________?

at street corners to control the flow of water at every depression and dead ends to drain out the waste water that may collect there at the foot of rising main along the slope to prevent back running of water at every summit of rising mains
Answer Explanation

MCQs 18: A pipe conveying sewage from plumbing system of a single building to common sewer or point of immediate disposal is called________________?

house sewer lateral sewer main sewer submain sewer
Answer Explanation

MCQs 19: Average rate of water consumption perhead per day as per Indian Standard is______________?

100 litres 135 litres 165 litres 200 litres
Answer Explanation

MCQs 20: Which of the following sewers is preferred for combined system of sewage ?

circular sewer egg shaped sewer rectangular sewer none of the above
Answer Explanation

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