🏗️Civil Engineering MCQs
Civil Engineering MCQs
479 MCQs221
Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to_______________?
AInitial demand
BFirst stage demand
CCarbonaceous demand
DAll of these
222
Imhoff cone is used to measure________________?
ATotal organic solids
BTotal solids
CTotal in organic solids
DSettleable solids
223
Dilution method of disposing of sewage, is not preferred to_______________?
AWhen sewage is fresh
BWhen diluting water has high dissolved oxygen content
CWhen diluting water is used for water supply near the point of sewage disposed
DWhen the diluting water is having flow currents
224
The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is_________________?
A1 in 100 upward
B1 in 500 upward
C1 in 100 downward
D1 in 503 upward
225
For the COD test of sewage, organic matter is oxidised by K2Cr2O7 in the presence of________________?
AH2SO4
BHNO3
CHCl
DNone of these
226
In sewers the velocity of flow should not be_________________?
AMore than the self-cleansing velocity
BLess than the self-cleansing velocity
CLess than 10 m/sec
DMore than 20 m/sec
227
In sewers the effect of scouring is more on__________________?
ATop side
BBottom side
CHorizontal side
DAll sides
228
Sewer ventilating columns are generally placed at_______________?
ADistances 150 m to 300 m
BUpper ends of branch sewers
CEvery change in the size of sewers
DAll the above
229
The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known_________________?
ABio-Chemical Oxygen Demand (
BDissolved Oxygen (
CO.
DNone of these
230
Water content of sewage is about___________________?
A90 %
B95 %
C99 %
D9.9 %