Civil Engineering MCQs

Page No. 44

The quantity of liquid waste which flows in sewers during the period of rainfall, is known__________________?


aSanitary sewage


bIndustrial waste


c Storm sewage


dNone of these


View Answer Storm sewage

Pick up the correct statement from the following ?


aThe larger the sewer in size, more will be velocity


bThe smaller the sewer in size, less will be velocity


cThe larger the sewer in size, no deposition will take place


d The larger the sewer in size, deposition will take place



A five day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is____________________?


a100


b1000


c5000


d10000


View Answer 10000

The spacing of man holes along a straight portion of a sewer is 300 m, the diameter of the sewer may be__________________?


a0.9 cm


b1.2 m


c1.5 m


d > 1.5 m


View Answer > 1.5 m

Pick up the correct statement from the following?


aIn treated sewage, 4 ppm of D.O. is essential


bOnly very fresh sewage contains some dissolved oxygen


cThe solubility of oxygen in sewage is 95% that is in distilled water


dAll the above


View Answer All the above

Lead caulked joints are used for laying____________________?


aStone ware pipes


bEarthenware pipes


c C.I. pipes


dG.I. pipes


View Answer Earthenware pipes

If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is_____________________?


a 50 ppm


b100 ppm


c 150 ppm


d200 ppm


View Answer 200 ppm

The pH value of fresh sewage is usually ______________________?


aEqual to 7


bMore than 7


cLess than 7


dEqual to zero


View Answer More than 7

Pick up the correct statement from the following?


aThe maximum rate of storm runoff is called peak drainage discharge


bRational method of estimating peak run off, may be used precisely for areas less than 50 hectares


cThe period after which the entire area starts contributing to the runoff, is called the time of concentration


d All the above


View Answer All the above

The spacing of bars for perforations in coarse screens used for the treatment of sewage, is ____________________?


a20 mm


b30 mm


c40 mm


d50 mm


View Answer 50 mm

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