🏗️Civil Engineering MCQs
Civil Engineering MCQs
479 MCQs211
Pick up the correct statement from the following _________________?
AThe materials separated by screens, is called screenings
BThe screenings are disposed off either by burning or by burial or by dumping
CThe process of burning the screenings, is known as compositing
DAll the above
212
To maintain aerobic biological activity, the moisture content of the compost mass should be about_________________?
A45 %
B50 %
C55 %
D60 %
213
The pH value of sewage is determined with the help of_________________?
AImhoff Cone
BTurbid meter
CPotentiometer
DNone of these
214
The normal value of over flow rates for plain primary sedimentation tanks, ranges between________________?
A25,000 to 35,000 litres/sqm/day
B40,000 to 50,000 litres/sqm/day
C50,000 to 60,000 litres/sqm/day
D80,000 to 100,000 litres/sqm/day
215
Which one of the following statements regarding septic tanks is wrong ?
AA gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided
BThe outlet invert level is kept 5 to 7.5 cm below the inlet invert level
CThe minimum width of septic level is 90 cm
DThe depth of tank is kept equal to its width
216
In areas where rainy season is limited to a few months, the type of sewerage system recommended is__________________?
ACombined system
BPartially separate system
CSeparate system
DNone of these
217
Dried sewage after treatment is used as____________________?
AFertilizer
BO.
CChemical for lowering
DD. Base material for paints
218
In areas where light rains are uniformly distributed throughout the year, the type of sewerage system to be adopted is_______________?
ASeparate system
BCombined system
CPartially combined system
DNone of these
219
5 days-biochemical oxygen demand (BOD5) is taken at a temperature of_________________?
A0°C
B15°C
C20°C
D25°C
220
The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is_______________?
A25 %
B50 %
C10 %
D5 %