Environmental Engineering

A. nitrogen
B. carbon dioxide
C. hydrogen sulphide
D. methane

A. X/4
B. X/2
C. X
D. 2X

A. 0 to 50
B. 50 to 150
C. 150 to 350
D. 350 to 500

A. 4.5 to 6.0
B. 6.5 to 8.0
C. 8.5 to 10.0
D. 10.5 to 12.0

A. sludge digestion
B. sludge disposal
C. sedimentation
D. filtration

A. aerobic bacteria only
B. algae only
C. dual action of aerobic bacteria and anaerobic bacteria
D. sedimentation

A. oxidation pond
B. oxidation ditch
C. aerated lagoons
D. trickling filters

A. sludge digestion tank
B. sedimentation tank
C. activated sludge treatment
D. trickling filters

A. grit chambers
B. detritus tanks
C. skimming tanks
D. sedimentation tanks

A. a theodolite
B. a compass
C. sight rails and boning rods
D. a plane table