1|Page
WASTE WATER ENGINEERING FINAL EXAM AND STUDYGUIDE
LATEST 2025 ACTUAL EXAM WITH COMPLETE QUESTIONS AND
CORRECT DETAILED ANSWERS (100% VERIFIED ANSWERS)
|ALREADY GRADED A+| ||PROFESSOR VERIFIED||
||BRANDNEW!!!||
Chlorination of water is done for the removal of
(A) Bacterias
(B) Suspended solids
(C) Sediments
(D) Hardness - ANSWER-Option A
Sludge banks are formed if sewage is disposed of in
(A) Rivers
(B) Seas
(C) Lakes
(D) None of these - ANSWER-Option B
Assertion (A): A free board of 0.3 m is provided above the top
sewage line in septic tanks.
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Reason (R): It helps to accommodate the scum in the septic tank.
(A) Both A and R is true and R is the correct explanation of A
(B) Both A and R is true but R is not a correct explanation of A
(C) A is true but R is false
(D) A is false but R is true - ANSWER-Option A
The temperature affects the
(A) Biological activity of bacteria in sewage
(B) Solubility of gases in sewage
(C) Viscosity of sewage
(D) All the above - ANSWER-Option D
The clarigesters are
(A) Circular septic tanks
(B) Rectangular septic tanks
(C) Circular Imhoff double tanks with bottom hoppers
(D) Circular Imhoff double storey tanks without bottom hoppers -
ANSWER-Option D
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The density of population over 40 hectares is 250/hectare. If
water supply demand per day is 200
litres and sewage discharge is 80% of water supply, the sewage
flow in sewers of separate system,
is
(A) 0.05552 cumec
(B) 0.05554 cumec
(C) 0.05556 cumec
(D) 0.0556 cumec - ANSWER-Option C
In a residential colony, sewers of diameters 100 mm, 150 mm and
225 mm were laid with a
gradient 1 in 120. Which portion of the sewage system does not
choke in due course of time?
(A) 100 mm dia.
(B) 150 mm dia.
(C) 225 mm dia.
(D) All of these - ANSWER-Option C
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The spacing of bars for perforations in coarse screens used for
the treatment of sewage, is
(A) 20 mm
(B) 30 mm
(C) 40 mm
(D) 50 mm - ANSWER-Option D
In case of Imhoff tanks,
(A) The shape is rectangular
(B) Detention period is 2 hours
(C) The velocity of flow is restricted to 0.30 m/minute
(D) All the above - ANSWER-Option D
The pH value of fresh sewage is usually
(A) Equal to 7
(B) More than 7
(C) Less than 7
WASTE WATER ENGINEERING FINAL EXAM AND STUDYGUIDE
LATEST 2025 ACTUAL EXAM WITH COMPLETE QUESTIONS AND
CORRECT DETAILED ANSWERS (100% VERIFIED ANSWERS)
|ALREADY GRADED A+| ||PROFESSOR VERIFIED||
||BRANDNEW!!!||
Chlorination of water is done for the removal of
(A) Bacterias
(B) Suspended solids
(C) Sediments
(D) Hardness - ANSWER-Option A
Sludge banks are formed if sewage is disposed of in
(A) Rivers
(B) Seas
(C) Lakes
(D) None of these - ANSWER-Option B
Assertion (A): A free board of 0.3 m is provided above the top
sewage line in septic tanks.
,2|Page
Reason (R): It helps to accommodate the scum in the septic tank.
(A) Both A and R is true and R is the correct explanation of A
(B) Both A and R is true but R is not a correct explanation of A
(C) A is true but R is false
(D) A is false but R is true - ANSWER-Option A
The temperature affects the
(A) Biological activity of bacteria in sewage
(B) Solubility of gases in sewage
(C) Viscosity of sewage
(D) All the above - ANSWER-Option D
The clarigesters are
(A) Circular septic tanks
(B) Rectangular septic tanks
(C) Circular Imhoff double tanks with bottom hoppers
(D) Circular Imhoff double storey tanks without bottom hoppers -
ANSWER-Option D
,3|Page
The density of population over 40 hectares is 250/hectare. If
water supply demand per day is 200
litres and sewage discharge is 80% of water supply, the sewage
flow in sewers of separate system,
is
(A) 0.05552 cumec
(B) 0.05554 cumec
(C) 0.05556 cumec
(D) 0.0556 cumec - ANSWER-Option C
In a residential colony, sewers of diameters 100 mm, 150 mm and
225 mm were laid with a
gradient 1 in 120. Which portion of the sewage system does not
choke in due course of time?
(A) 100 mm dia.
(B) 150 mm dia.
(C) 225 mm dia.
(D) All of these - ANSWER-Option C
, 4|Page
The spacing of bars for perforations in coarse screens used for
the treatment of sewage, is
(A) 20 mm
(B) 30 mm
(C) 40 mm
(D) 50 mm - ANSWER-Option D
In case of Imhoff tanks,
(A) The shape is rectangular
(B) Detention period is 2 hours
(C) The velocity of flow is restricted to 0.30 m/minute
(D) All the above - ANSWER-Option D
The pH value of fresh sewage is usually
(A) Equal to 7
(B) More than 7
(C) Less than 7
