Environmental Engineering MCQs

A. 20°C – 1day

B. 25°C- 3day

C. 20°C – 5day

D. 30°C- 5day

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

A. aerobic only

B. anaerobic only

C. aerobic in lower compartment and anaerobic in upper compartment

D. anaerobic in lower compartment and aerobic in upper compartment

A. more depth

B. less depth

C. more discharge

D. less discharge

A. nitrogen

B. carbon dioxide

C. hydrogen sulphide

D. methane

A. B

B. 2B

C. 4B

D. 8B

A. dissolved organic substances

B. dissolved solids and dissolved gases

C. floating solids and dissolved inorganic solids

D. bacteria and colloidal solids

A. 0.2 to 0.4

B. 0.4 to 1.0

C. 2 to 4

D. 5 to 7

A. applied chlorine

B. residual chlorine

C. sum of applied and residual chlorine

D. difference of applied and residual chlorine

A. equal to HMD when flowing full

B. less than HMD when flowing full

C. greater than HMD when flowing full

D. none of the above