Waste Water Engineering Mcqs

This set of Civil Engineering Multiple Choice Questions & Answers (MCQs) focuses on “ Waste Water Engineering ”. These Mcqs are chosen from a collection of most authoritative and best reference books on Civil Engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Waste Water Engineering comprehensively.

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The coagulant which is generally not used for treating the sewage, is__________________?


Ferric chloride

Ferric sulphate

Chlorinated copperas

If the flame of a miner’s safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains_______________?

Hydrogen sulphide

Carbon dioxide



The Chezy’s constant C in the formula V = C_________________?

Size of the sewer

Shape of the sewer

Roughness of sewer surface

All the above

For the open drain (N = 0.025) shown in the below figure, the discharge is________________?

26.88 cumecs

27.88 cumecs

28.88 cumecs

29.88 cumecs

Assertion A.: The determination of pH value of sewerage is important. Reason (R): The efficiency of certain treatment methods depends upon the availability of pH value________________?

Both A and R are true and R is the correct explanation of A

Both A and R are true but R is not a correct explanation of A

A is true but R is false

A is false but R is true

The drainage area of a town is 12 hectares. Its 40% area is hard pavement ( K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula Ps = 900/(t + 60) the maximum run off is__________________?

0.10 cumec

0.12 cumec

0.15 cumec

0.20 cumec

The rational formula for peak drainage discharge, was evolved by_________________?


Lloyd David


All of these

Dry weather flow is__________________?

Average daily rate of flow

Average monthly rate of flow

Average annual rate of flow

Water supply allowance per capita

¾th or ¼th extra space is left in sewer pipes at maximum discharge for_________________?

Low estimates of the average and maximum flows

Large scale infiltration of storm water

Unexpected increase in population

All the above

Aerobic bacterias___________________?

Flourish in the presence of free oxygen

Consume organic matter as their food

Oxidise organic matter in sewage

All the above


Are water seals which prevent the entry of foul gases

Are used to trap the rats entering sewers

Dissolve the foul gases

Create symphonic action to increase the quick disposal of sewerage

Hydraulic mean radius is_______________?

Mean radius of sewer

Difference in heads between two points in circular pipes

Mean of radii in a pipe line of varying cross -sections

Cross-sectional area/wetted perimeter

The sewer which received discharge from two or more main sewers, is known as_______________?

A trunk sewer

An outfall sewer

A main sewer

An intercepting sewer

For treating the sewage of a large city, you will recommend_________________?

A sedimentation tank and an activated sludge treatment plant

A plant consisting of Imhoff tanks with low rate trickling filters

Sedimentation tanks with high rate trickling filters

None of these

1000 kg of sewage contains________________?

0.112 kg in suspension

0.112 kg in solution

0.225 kg in solution

Both A. and C. of above

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