Environmental Engineering

A. maximum flow only
B. minimum flow only
C. average flow only
D. maximum and minimum flow

A. presence of oxygen only
B. absence of oxygen only
C. presence as well as in absence of oxygen
D. presence of water

A. 1
B. 100
C. infinite
D. zero

A. 100 ppm
B. 200 ppm
C. 300 ppm
D. 400 ppm

A. directly proportional to BOD satisfied
B. directly proportional to BOD remain-ing
C. inversely proportional to BOD satisfied
D. inversely proportional to BOD re-maining

A. 20°C – 1day
B. 25°C- 3day
C. 20°C – 5day
D. 30°C- 5day

A. 5-10 years
B. 15-20 years
C. 30-40 years
D. 40-50 years

A. nitrification
B. chlorination
C. oxidation
D. none of the above

A. circular sewer
B. egg shaped sewer
C. horse-shoe type sewer
D. semi-elliptical sewer

A. to decrease it
B. to increase it
C. fluctuating
D. nil