🏗️Civil Engineering MCQs
Civil Engineering MCQs
479 MCQs201
If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is_________________?
A50 mg/l
B100 mg/l
C150 mg/l
D250 mg/l
202
The clarigesters are_________________?
ACircular septic tanks
BRectangular septic tanks
CCircular Imhoff double tanks with bottom hoppers
DCircular Imhoff double storey tanks without bottom hoppers
203
In a residential colony, sewers of diameters 100 mm, 150 mm and 225 mm were laid with a gradient 1 in 120. Which portion of the sewage system does not choke in due course of time?
A100 mm dia.
B150 mm dia.
C225 mm dia.
DAll of these
204
If D is the diameter of a circular sewer and D’ is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is_______________?
AD’ = 0.64 D
BD’ = 0.74 D
CD’ = 0.84 D
DD’ = 0.94 D
205
In case of Imhoff tanks_____________________?
AThe shape is rectangular
BDetention period is 2 hours
CThe velocity of flow is restricted to 0.30 m/minute
DAll the above
206
The maximum depth of sedimentation tanks, is kept__________________?
A3 m
B3.5 m
C4 m
D4.5 m
207
A sewer running partially full and hurried with back filled, fails in compression due to_________________?
AWeight of the pipe
BWeight of the back fill
CSuperimposed traffic loads
DAll the above
208
Kjeldahl nitrogen is a mixture of___________________?
AAmmonia and nitrogen
BNitrogen and organic nitrogen
COrganic nitrogen and ammonia
DAll the above
209
Nitrogen cycle of sewage, is____________________?
ALiberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen
BLiberation of nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates
CLiberation of nitrogen-formation of nitrates-formation of nitrites-liberation of ammonia
DFormation of nitrates-formation of nitrites-liberation of nitrates-liberation of nitrates
210
The minimum diameter of a sewer is kept __________________?
A10 cm
B15 cm
C20 cm
D25 cm