Civil Engineering MCQs

Page No. 173

The characteristics of fresh and septic sewage respectively are____________________?


aacidic and alkaline


balkaline and acidic


cboth acidic


d both alkaline


View Answer alkaline and acidic

Which of the following retards the self purification of stream ?


ahigher temperature


bsunlight


csatisfying oxygen demand


dnone of the above


View Answer none of the above

Settling velocity increases with_______________?


aspecific gravity of solid particles


b size of particles


cdepth of tank


dtemperature of liquid


View Answer depth of tank

The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by_______________?


aTOD>BOD>COD


bTOD>COD>BOD


c BOD>COD>TOD


d COD>BOD>TOD


View Answer TOD>COD>BOD

The ratio of 5 day BOD to ultimate BOD is about_______________?


a 1/3


b2/3


c3/4


d1.0


View Answer 2/3

The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is______________?


a1 ppm


b 4 ppm


c 10 ppm


d40 ppm


View Answer 4 ppm

Dissolved oxygen in streams is______________?


amaximum at noon


bminimum at noon


c maximum at midnight


dsame throughout the day


View Answer maximum at noon

The means of access for inspection and cleaning of sewer line is known as_______________?


ainlet


bmanhole


cdrop manhole


dcatch basin


View Answer manhole

Sewage treatment units are designed for_______________?


amaximum flow only


bminimum flow only


c average flow only


d maximum and minimum flow


View Answer average flow only

Corrosion in concrete sewers is caused by______________?


aseptic conditions


bdissolved oxygen


cchlorine


dnitrogen


View Answer septic conditions

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