🏗️Civil Engineering MCQs
Civil Engineering MCQs
479 MCQs11
A well oxidized sewage contains nitrogen mainly as___________________?
ANitrates
BNitrites
CFree ammonia
DNone of these
12
If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is_________________?
A100 mg/l
B200 mg/l
C300 mg/l
D400 mg/l
13
Self-cleansing velocity is__________________?
AVelocity at dry weather flow
BVelocity of water at flushing
CVelocity at which no accumulation remains in the drains
DVelocity of water in a pressure filter
14
15 cumecs, the depth d and width are related by For drains up to___________________?
Ad = 0.2 B
Bd = 0.5 B
CB = 0.2 d
DB = 0.5 d
15
The rate of accumulation of sludge in septic tanks is recommended as____________________?
A30 litres/person/year
B25 litres/person/year
C30 litres/person/month
D25 litres/person/month
16
In a trickling filter_________________?
Aand
BD. Both
CNeither
17
If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is___________________?
A2 hours
B4 hours
C6 hours
D8 hours
18
Hume steel pipes are__________________?
ASteel pipes
Band
CSteel shell coated from outside with cement mortar
DBoth
19
The detention period for plain sedimentation water tanks, is usually____________________?
A4 to 8 hours
B8 to 16 hours
C16 to 24 hours
D24 to 36 hours
20
Primary treatment of sewage consists of removal of__________________?
ALarge suspended organic solids
BOil and grease
CSand and girt
DFloating materials