🏗️Civil Engineering MCQs
Civil Engineering MCQs
479 MCQs121
Aerobic activity is maximum_______________?
AIn freshly produced sewage
BAt sewer pipes
CIn sewer treatment plants
DNone of these
122
Before discharging the foul sewage into rivers, it is generally treated by_____________________?
AScreening
BSedimentation
COxidation
DAll the above
123
In 1000 kg of sewage, the total solids approximate___________________?
A0.5 to 1.0 kg
B1 kg to 2.0 kg
C5 kg to 7.5 kg
D7.5 kg to 10 kg
124
If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is__________________?
A1 in 60
B1 in 100
C1 in 120
DNone of these
125
To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of_______________?
AHydrochloric acid
BSulphuric acid
CNitric acid
DCitric acid
126
The sewer which transports the sewage to the point of treatment, is called________________?
AHouse sewer
BOut-fall sewer
CBranch sewer
DMain sewer
127
If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains__________________?
AHydrogen sulphide
BCarbon dioxide
CMethane
DOxygen
128
The gas evolved in sewers is________________?
ACarbondioxide
BHydrogen sulphide
CMethane
DAll of these
129
In sewage, the solids in mg per litre is__________________?
A100 to 500
B500 to 1000
C1000 to 1500
D1500 to 2000
130
If is the diameter of upper circular portion, the area of cross-section of a standard egg shaped sewer, is____________________?
AD²
BD²
CD²
DD²