Civil Engineering MCQs

Page No. 36

In 1000 kg of sewage, the total solids approximate___________________?


a 0.5 to 1.0 kg


b1 kg to 2.0 kg


c5 kg to 7.5 kg


d7.5 kg to 10 kg


View Answer 0.5 to 1.0 kg

If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is__________________?


a1 in 60


b1 in 100


c1 in 120


dNone of these


View Answer 1 in 60

To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of_______________?


a Hydrochloric acid


bSulphuric acid


c Nitric acid


dCitric acid


View Answer Sulphuric acid

The sewer which transports the sewage to the point of treatment, is called________________?


aHouse sewer


bOut-fall sewer


c Branch sewer


dMain sewer


View Answer Out-fall sewer

If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains__________________?


aHydrogen sulphide


bCarbon dioxide


cMethane


dOxygen


View Answer Hydrogen sulphide

The gas evolved in sewers is________________?


aCarbondioxide


bHydrogen sulphide


cMethane


dAll of these


View Answer All of these

In sewage, the solids in mg per litre is__________________?


a100 to 500


b500 to 1000


c1000 to 1500


d1500 to 2000


View Answer 500 to 1000

If is the diameter of upper circular portion, the area of cross-section of a standard egg shaped sewer, is____________________?


a


b


c


d


View Answer

The small sewers are cleaned by____________________?


aFlushing


bCane rodding


cWooden pills


dNone of these


View Answer Flushing

In sewers the gas generally found, is_________________?


aHydrogen sulphide (H2S)


bCarbon dioxide (CO2)


cMethane (CH4)


dAll the above


View Answer All the above

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