Civil Engineering MCQs

Page No. 36

In 1000 kg of sewage, the total solids approximate___________________?


a 0.5 to 1.0 kg

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b1 kg to 2.0 kg

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c5 kg to 7.5 kg

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d7.5 kg to 10 kg

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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

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b1 in 100

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c1 in 120

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dNone of these

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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

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bSulphuric acid

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c Nitric acid

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dCitric acid

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View Answer Sulphuric acid

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


aHouse sewer

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bOut-fall sewer

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c Branch sewer

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dMain sewer

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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

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bCarbon dioxide

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cMethane

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dOxygen

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View Answer Hydrogen sulphide

The gas evolved in sewers is________________?


aCarbondioxide

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bHydrogen sulphide

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cMethane

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dAll of these

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View Answer All of these

In sewage, the solids in mg per litre is__________________?


a100 to 500

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b500 to 1000

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c1000 to 1500

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d1500 to 2000

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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 D²

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bD²

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cD²

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dD²

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View Answer D²

The small sewers are cleaned by____________________?


aFlushing

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bCane rodding

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cWooden pills

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dNone of these

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View Answer Flushing

In sewers the gas generally found, is_________________?


aHydrogen sulphide (H2S)

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bCarbon dioxide (CO2)

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cMethane (CH4)

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dAll the above

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View Answer All the above

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