Civil Engineering MCQs

Page No. 31

The settlement of a particle in sedimentation tank, is affected by_____________________?


a Velocity of flow


bViscosity of water


cSize and shape of solid


d All the above


View Answer All the above

A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is_____________________?


a0.30 m/sec


b0.35 m/sec


c0.40 m/sec


d0.45 m/sec


View Answer 0.45 m/sec

The sewer which collects the discharge from a collecting system and delivers it to a treatment plant, is known_____________________?


aHouse sewer


bLateral sewer


cBranch sewer


d Sewer outfall


View Answer Sewer outfall

The most dangerous pollutant in vehicular emissions is____________________?


aCO


bSO2


cCO2


dO3


View Answer CO

For laying a sewer line in a trench of 2 m width, an offset line is marked on the ground parallel to the given centre line at a distance of___________________?


a 100 cm


b120 cm


c140 cm


d160 cm


View Answer 160 cm

The following is the physical characteristic of sewage___________________?


aTurbidity


bColour


cOdour


d All the above


View Answer All the above

It is customary to design a sewer for D.W.F. on the basis of________________?


aAverage demand


b Twice the average demand


cThrice the average demand


d Four times the average demand



Fresh sewage is generally_____________________?


aAlkaline


bAcidic


cHighly decomposed


d A source of objectionable odour


View Answer Alkaline

For detecting the nitrites in the sewage, the matching colour may be developed by adding_________________?


aPotassium permanganate


bSulphuric acid and napthamine


cPhenol-di -sulphuric acid potassium hydroxide


d None of these



The laying of sewers is done with____________________?


aMagnetic compass


bTheodolite


cLevel


dClinometer


View Answer Level

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