A. Imhoff tanks
B. Trickling filters
C. Sludge sedimentation tanks
D. None of these
A. 1 in 60
B. 1 in 100
C. 1 in 120
D. None of these
A. Raising low lying areas by dumg
B. Concreting
C. Both A. and B.
D. Neither A. nor B
A. Total organic solids
B. Total solids
C. Total in organic solids
D. Settleable solids
A. When sewage is fresh
B. When diluting water has high dissolved oxygen content
C. When diluting water is used for water supply near the point of sewage disposed
D. When the diluting water is having flow currents
A. 1 in 100 upward
B. 1 in 500 upward
C. 1 in 100 downward
D. 1 in 503 upward
A. H2SO4
B. HNO3
C. HCl
D. None of these
A. More than the self-cleansing velocity
B. Less than the self-cleansing velocity
C. Less than 10 m/sec
D. More than 20 m/sec
A. Top side
B. Bottom side
C. Horizontal side
D. All sides
A. Distances 150 m to 300 m
B. Upper ends of branch sewers
C. Every change in the size of sewers
D. All the above