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WASTE WATER ENGINEERING FINAL EXAM AND STUDYGUIDE
NEWEST 2025/2026 ACTUAL EXAM WITH COMPLETE QUESTIONS
AND CORRECT DETAILED ANSWERS (100% VERIFIED ANSWERS)
|ALREADY GRADED A+| ||PROFESSOR VERIFIED||
In areas where light rains are uniformly distributed throughout the
year, the type of sewerage
system to be adopted is
(A) Separate system
(B) Combined system
(C) Partially combined system
(D) None of these - ANSWER-Option B
Self-cleansing velocity is
(A) Velocity at dry weather flow
(B) Velocity of water at flushing
(C) Velocity at which no accumulation remains in the drains
(D) Velocity of water in a pressure filter - ANSWER-Option C
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5 days-biochemical oxygen demand (BOD5) is taken at a
temperature of
(A) 0°C
(B) 15°C
(C) 20°C
(D) 25°C - ANSWER-Option C
Pick up the correct statement from the following:
(A) Inlets are provided on the road surface at the lowest point for
draining rain water
(B) Inlets are generally provided at an interval of 30 m to 60 m
along straight roads
(C) Inlets having horizontal openings, are called horizontal inlets
(D) All the above - ANSWER-Option D
If a 2% solution of sewage sample is incubated for 5 days at 20°C
and the dissolved oxygen
depletion was found to be 8 mg/l. The BOD of the sewage is
(A) 100 mg/l
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(B) 200 mg/l
(C) 300 mg/l
(D) 400 mg/l - ANSWER-Option D
Pick up the in-correct statement from the following:
(A) Manholes are provided in sewer pipes at suitable intervals
(B) Catch basins are generally provided in sewers for carrying
drainage discharge
(C) Inlets are generally provided in all sewers
(D) None of these - ANSWER-Option C
A well oxidized sewage contains nitrogen mainly as
(A) Nitrates
(B) Nitrites
(C) Free ammonia
(D) None of these - ANSWER-Option A
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The moisture content of sludge is reduced from 90% to 80% in a
sludge digestion tank. The
percentage decrease in the volume of sludge, is
(A) 25 %
(B) 50 %
(C) 10 %
(D) 5 % - ANSWER-Option B
In a sludge tank, the gas mainly produced, is
(A) Oxygen
(B) Nitrogen
(C) Hydrogen
(D) Carbon dioxide - ANSWER-Option D
Bio-chemical oxygen demand (BOD) for the first 20 days in
generally referred to
(A) Initial demand
(B) First stage demand
WASTE WATER ENGINEERING FINAL EXAM AND STUDYGUIDE
NEWEST 2025/2026 ACTUAL EXAM WITH COMPLETE QUESTIONS
AND CORRECT DETAILED ANSWERS (100% VERIFIED ANSWERS)
|ALREADY GRADED A+| ||PROFESSOR VERIFIED||
In areas where light rains are uniformly distributed throughout the
year, the type of sewerage
system to be adopted is
(A) Separate system
(B) Combined system
(C) Partially combined system
(D) None of these - ANSWER-Option B
Self-cleansing velocity is
(A) Velocity at dry weather flow
(B) Velocity of water at flushing
(C) Velocity at which no accumulation remains in the drains
(D) Velocity of water in a pressure filter - ANSWER-Option C
,2|Page
5 days-biochemical oxygen demand (BOD5) is taken at a
temperature of
(A) 0°C
(B) 15°C
(C) 20°C
(D) 25°C - ANSWER-Option C
Pick up the correct statement from the following:
(A) Inlets are provided on the road surface at the lowest point for
draining rain water
(B) Inlets are generally provided at an interval of 30 m to 60 m
along straight roads
(C) Inlets having horizontal openings, are called horizontal inlets
(D) All the above - ANSWER-Option D
If a 2% solution of sewage sample is incubated for 5 days at 20°C
and the dissolved oxygen
depletion was found to be 8 mg/l. The BOD of the sewage is
(A) 100 mg/l
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(B) 200 mg/l
(C) 300 mg/l
(D) 400 mg/l - ANSWER-Option D
Pick up the in-correct statement from the following:
(A) Manholes are provided in sewer pipes at suitable intervals
(B) Catch basins are generally provided in sewers for carrying
drainage discharge
(C) Inlets are generally provided in all sewers
(D) None of these - ANSWER-Option C
A well oxidized sewage contains nitrogen mainly as
(A) Nitrates
(B) Nitrites
(C) Free ammonia
(D) None of these - ANSWER-Option A
, 4|Page
The moisture content of sludge is reduced from 90% to 80% in a
sludge digestion tank. The
percentage decrease in the volume of sludge, is
(A) 25 %
(B) 50 %
(C) 10 %
(D) 5 % - ANSWER-Option B
In a sludge tank, the gas mainly produced, is
(A) Oxygen
(B) Nitrogen
(C) Hydrogen
(D) Carbon dioxide - ANSWER-Option D
Bio-chemical oxygen demand (BOD) for the first 20 days in
generally referred to
(A) Initial demand
(B) First stage demand
