In chlorination, with the rise in temperature of water, death rate of bacteria____________?
(A) increases
(B) decreases
(C) remains unaffected
(D) none of the above
The suitable method for disinfection of swimming pool water is________________?
(A) ultra violet rays treatment
(B) lime treatment
(C) by using potassium permanganate
(D) chlorination
Most suitable section of sewer in separate sewage system is________________?
(A) rectangular section
(B) circular section
(C) standard form of egg shaped sewer
(D) modified egg shaped section
The minimum and maximum diameters of sewers shall preferably be_________________?
(A) 15 cm and 100 cm
(B) 15 cm and 300 cm
(C) 30 cm and 450 cm
(D) 60 cm and 300cm
The design discharge for the separate sewer system shall be taken as_____________?
(A) equal to dry weather flow (DWF)
(B) 2xDWF
(C) 3 x DWF
(D) 6xDWF
The self cleansing velocity for all sewers in India is usually_________________?
(A) less than 1.0 m/sec
(B) 1.0 m/sec to 1.2 m/sec
(C) 1.5 m/sec to 2.0 m/sec
(D) 3.0 m/sec to 3.5 m/sec
The time of concentration is defined as_______________?
(A) the time taken by rainfall water to run from most distant point of water shed to the inlet of sewer
(B) the time required for flow of water in sewer to the point under consideration
(C) sum of (A) and (B)
(D) difference of (A) and (B)
The water carriage system of collection of waste product________________?
(A) is cheaper in initial cost than dry conservancy system
(B) requires treatment before disposal
(C) creates hygenic problem
(D) all of the above
Which of the following sewers is preferred for combined system of sewage ?
(A) circular sewer
(B) egg shaped sewer
(C) rectangular sewer
(D) none of the above
Average rate of water consumption perhead per day as per Indian Standard is______________?
(A) 100 litres
(B) 135 litres
(C) 165 litres
(D) 200 litres