A. is economical than circular section
B. provides self cleansing velocity at low discharges
C. is more stable than circular section
D. is easy to construct
✅ The correct answer is option B.
Environmental Engineering MCQs
The suitable method of forecasting popu¬lation for a young and rapidly increasing city is_________________?
A. arithmetical increase method
B. geometrical increase method
C. incremental increase method
D. graphical method
✅ The correct answer is option B.
Most of the bacteria in sewage are______________?
A. parasitic
B. saprophytic
C. pathogenic
D. anaerobic
✅ The correct answer is option B.
The ratio of 5 day BOD to ultimate BOD is about_______________?
A. 1/3
B. 2/3
C. 3/4
D. 1.0
✅ The correct answer is option B.
The pathogens can be killed by_______________?
A. nitrification
B. chlorination
C. oxidation
D. none of the above
✅ The correct answer is option B.
The suitable layout of distribution system for a city with roads of rectangular pattern is______________?
A. grid iron system
B. dead end system
C. ring system
D. radial system
✅ The correct answer is option A.
The maximum efficiency of BOD removal is achieved in______________?
A. oxidation pond
B. oxidation ditch
C. aerated lagoons
D. trickling filters
✅ The correct answer is option B.
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
✅ The correct answer is option B.
The rate of filtration in slow sand filters in million litres per day per hectare is about_____________?
A. 50 to 60
B. 100 to 150
C. 500 to 600
D. 1400 to 1500
✅ The correct answer is option A.
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_______________?
A. check valve
B. sluice valve
C. safety valve
D. scour valve
✅ The correct answer is option B.