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

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View Answer alkaline and acidic

Which of the following retards the self purification of stream ?


ahigher temperature

✖


bsunlight

✖


csatisfying oxygen demand

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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

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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

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bTOD>COD>BOD

✓


c BOD>COD>TOD

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d COD>BOD>TOD

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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

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View Answer maximum at noon

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


ainlet

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bmanhole

✓


cdrop manhole

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dcatch basin

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View Answer manhole

Sewage treatment units are designed for_______________?


amaximum flow only

✖


bminimum flow only

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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

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View Answer septic conditions

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