A. grit chambers
B. detritus tanks
C. skimming tanks
D. sedimentation tanks
✅ The correct answer is option C.
Environmental Engineering MCQs
Which of the following is not a water borne disease ?
A. dysentery
B. cholera
C. typhoid
D. maleria
✅ The correct answer is option D.
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
✅ The correct answer is option C.
If Biochemical oxygen demand (BOD. of a town is 20000 kg/day and BOD per capita per day is 0.05 kg, then population equivalent of town is_________________?
A. 1000
B. 4000
C. 100000
D. 400000
✅ The correct answer is option D.
In facultative stabilization pond, the sewage is treated by________________?
A. aerobic bacteria only
B. algae only
C. dual action of aerobic bacteria and anaerobic bacteria
D. sedimentation
✅ The correct answer is option C.
The devices which are installed for drawing water from the sources are called______________?
A. aquifers
B. aquiclude
C. filters
D. intakes
✅ The correct answer is option D.
Which of the following retards the self purification of stream ?
A. higher temperature
B. sunlight
C. satisfying oxygen demand
D. none of the above
✅ The correct answer is option D.
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 correct answer is option D.
The settling velocity of a particle in a sedimentation tank increases if______________?
A. particle size is decreased
B. the surface area of tank is increased
C. the depth of tank is decreased
D. none of the above
✅ The correct answer is option D.
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
✅ The correct answer is option D.