Waste Water Engineering MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Waste Water Engineering, a fundamental topic in the field of Civil Engineering. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Waste Water Engineering MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Waste Water Engineering mcq questions that explore various aspects of Waste Water Engineering problems. Each MCQ is crafted to challenge your understanding of Waste Water Engineering principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Civil Engineering tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Waste Water Engineering MCQs are your pathway to success in mastering this essential Civil Engineering topic.

Note: Each of the following question comes with multiple answer choices. Select the most appropriate option and test your understanding of Waste Water Engineering. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

So, are you ready to put your Waste Water Engineering knowledge to the test? Let's get started with our carefully curated MCQs!

Waste Water Engineering MCQs | Page 17 of 32

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Q161.
3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the DO. concentration was 5 mg/l. The BOD of raw sewerage is

a.

100 mg/l

b.

200 mg/l

c.

300 mg/l

d.

400 mg/l.

Discuss
Answer: (c).300 mg/l
Q162.
The arrangement made for passing the sewer line below an obstruction below the hydraulic gradient lines called

a.

inverted syphon

b.

depressed sewer

c.

sag pipe

d.

all of these.

Discuss
Answer: (d).all of these.
Q163.
The angle subtended by the surface of sewer water with partial flow, at sewer centre is 120°, the depth of sewerage is

a.

20 cm

b.

25 cm

c.

40 cm

d.

50 cm

Discuss
Answer: (d).50 cm
Q164.
Imhoff cone is used to determine

a.

settlable solids

b.

suspended solids

c.

dissolved solids

d.

none of these.

Discuss
Answer: (a).settlable solids
Q165.
The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is

a.

100 cm

b.

110 cm

c.

120 cm

d.

150 cm.

Discuss
Answer: (c).120 cm
Q166.
If the grit in grit chambers is 4.5 million litres per day, its cleaning is done

a.

manually

b.

mechanically

c.

hydraulically

d.

electrically.

Discuss
Answer: (a).manually
Q167.
The gas evolved in sewers is

a.

Carbondioxide

b.

Hydrogen sulphide

c.

Methane

d.

All of these.

Discuss
Answer: (d).All of these.
Q168.
The maximum depth of sedimentation tanks, is kept

a.

3 m

b.

3.5 m

c.

4 m

d.

4.5 m.

Discuss
Answer: (a).3 m
Q169.
The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is

a.

1 in 100 upward

b.

1 in 500 upward

c.

1 in 100 downward

d.

1 in 503 upward.

Discuss
Answer: (c).1 in 100 downward
Q170.
The detention time (t) of a settling tank, may be defined as the time required for

a.

a particle to travel along its length

b.

a particle to travel from top surface to bottom sludge zone

c.

the flow of sewage to fill the tank

d.

none of these.

Discuss
Answer: (c).the flow of sewage to fill the tank
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