Category: Environmental Engineering

A. is cheaper in initial cost than dry conservancy system
B. requires treatment before disposal
C. creates hygenic problem
D. all of the above

A. increasing the depth of tank
B. decreasing the depth of tank
C. increasing the surface area of tank
D. decreasing the surface area of tank

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

A. percentage of sludge by volume to percentage of suspended solids by weight
B. percentage of sludge by volume to percentage of total solids by weight
C. percentage of suspended solids by weight to percentage of sludge by volume
D. percentage of total solids by weight to percentage of sludge by volume

A. 100 litres
B. 135 litres
C. 165 litres
D. 200 litres

A. 9500
B. 9800
C. 10100
D. 10920

A. separate system
B. combined system
C. partially separate system
D. partially combined system

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

1) decreasing the time of contact
2) decreasing the temperature of water
3) increasing the temperature of water
The correct answer is ?
A. only (1)
B. both (1) and (2)
C. both (1) and (3)
D. only (3)

A. sulphuric acid
B. copper sulphate
C. lime
D. sodium permanganate