Civil Engineering MCQs

Page No. 43

In detritus tanks______________________?


aFlow velocity is kept 0.09 m/sec

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bDetention period is kept 3 to 4 minutes

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cOrganic and inorganic materials are separated

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dAll the above

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View Answer All the above

The screens are fixed___________________?


aPerpendicular to the direction of flow

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bParallel to the direction of flow

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c At an angle 30° to 60° to the direction of flow

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dNone of these

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Pathogens (or pathogenic bacterias) in water may cause___________________?


aTyphoid

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bCholera

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cDysentery

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d All the above

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View Answer All the above

The value of Chezy’s constant C = 157.6/(1.81 + K/ ) is used in__________________?


aChezy’s formula

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bBazin’s formula

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cKutter’s formula

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dManning’s formula

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View Answer Bazin’s formula

For large sewers, maximum distance between manholes may be_______________?


a50 m

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b100 m

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c200 m

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d300 m

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View Answer 300 m

Pick up the incorrect statement from the following ?


aSeptic tanks are horizontal continuous flow type of sedimentation tanks

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bSeptic tanks are generally provided a detention period of 12 to 36 hours

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cSeptic tanks are completely covered and high vent shafts are provided for the escape of foul gases

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d None of these

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View Answer None of these

For sewers, inverted siphon is provided for___________________?


a One pipe

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bTwo pipes

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cThree pipes

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dFour pipes

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View Answer Three pipes

Which one of the following gases is most significant as air pollutant ?


aCarbondioxide

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bOxygen

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cNitrogen

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dSulphur-dioxide

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View Answer Sulphur-dioxide

A cylindrical ejector having its height 2 m fills after every 10 minutes with a peak sewage discharge of 0.0157 cumec. The diameter of the ejector chamber, is_____________________?


a2.30 m

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b2.40 m

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c2.45 m

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d2.50 m

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View Answer 2.45 m

Depletion of ozone layer in the outer atmosphere may cause___________________ ?


aLung cancer

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bSkin cancer

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cBronchitis

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dHeart disorder

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View Answer Skin cancer

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