Question No:1

The major portion of waste water in cities and towns is ______.

[A] Household waste
[B] Industrial waste
[C] Human excreta
[D] Both (a) and (b)



Question No:2

Municipal waste water is also known as ______.

[A] Drainage
[B] Sewage
[C] Spillage
[D] Gutter



Question No:3

Sewage is treated in ______.

[A] STD
[B] STP
[C] SPT
[D] SDT



Question No:4

STP stands for:

[A] Sequential Topographical Projection
[B] Standard Test Procedure
[C] Sewage Treatment Plant
[D] None of the above



Question No:5

Which microbes help in sewage treatment?

[A] Autotrophic
[B] Heterotrophic
[C] Symbiotic
[D] Saprophytic



Question No:6

Sewage water treatment is done in how many stages?

[A] 1
[B] 3
[C] 2
[D] 4



Question No:7

Primary treatment of sewage waste involves which processes?

[A] Filtration and incubation
[B] Sedimentation and decantation
[C] Filtration and sedimentation
[D] Sedimentation and microbial proliferation



Question No:8

In sewage treatment plant, primary treatment involving removal of floating debris is done by:

[A] Vacuum filtration
[B] Pressure filtration
[C] Sequential filtration
[D] Sedimentation



Question No:9

In primary treatment of sewage water, removal of grit involves which process?

[A] Decantation
[B] Picking
[C] Filtration
[D] Sedimentation



Question No:10

In primary treatment of sewage water, after sedimentation, the solids that settle form ______.

[A] activated sludge
[B] primary sludge
[C] secondary sludge
[D] Both (a) and (c)



Question No:11

The supernatant left after sedimentation of sewage water during primary treatment is known as:

[A] Affluent
[B] Floes
[C] Sludge
[D] Effluent



Question No:12

Which of the following is transferred from primary setting tank to another tank for secondary treatment?

[A] Grit
[B] Sludge
[C] Effluent
[D] Floe



Question No:13

The secondary treatment of sewage waste is also known as ______.

[A] Chemical treatment
[B] Physical treatment
[C] Biological treatment
[D] Detoxification



Question No:14

Which of the following is used in secondary treatment of sewage water?

[A] Fermentation tanks
[B] Digester tanks
[C] Detoxification tanks
[D] Aeration tanks



Question No:15

What kind of microbes is present in ‘flocs’ formed during secondary treatment of sewage?

[A] Aerobic
[B] Anaerobic
[C] Symbiotic
[D] Aero tolerant