Civil Engineering MCQs

Page No. 180

Alum as a coagulant is found to be most effective when pH range of water is______________?


a 2 to 4


b4 to 6


c6 to 8


d8 to 10


View Answer 6 to 8

The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally_______________?


aless and more


bless and less


cmore and less


dmore and more


View Answer more and less

Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about_______________?


a 10 to 25


b50


c75


d100


View Answer 75

The length of rectangular sedimentation tank should not be more than_______________?


aB


b 2B


c4B


d8B



The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of________________?


a1 mg/litre


b10 mg/litre


c100 mg/litre


d1000 mg/litre


View Answer 10 mg/litre

If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to________________?


atotal alkalinity


btotal hardness


c total hardness – total alkalinity


d non carbonate hardness


View Answer total alkalinity

Residual chlorine in water is determined by____________


astarch iodide method


b orthotolidine method


cboth (A) and (B)


dnone of the above


View Answer both (A) and (B)

Turbidity is measured on_______________?


astandard silica scale


bstandard cobalt scale


c standard platinum scale


d platinum cobalt scale



The maximum permissible limit for flouride in drinking water is______________?


a0.1 mg/litre


b1.5 mg/litre


c5 mg/litre


d 10 mg/litre


View Answer 1.5 mg/litre

Alkalinity in water is expressed as milli-grams per litre in terms of equivalent_______________?


a calcium carbonate


bmagnesium carbonate


csodium carbonate


d calcium hydroxide


View Answer calcium carbonate

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