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Previous year question hub

Water and Waste Water Quality and Treatment - Environmental Engineering - Civil Engineering Previous Year Questions

Practice Water and Waste Water Quality and Treatment - Environmental Engineering - Civil Engineering previous year questions organised from real papers, with year-wise coverage and clear topic navigation.

23Papers
17Years
96Questions
1Topics

Water and Waste Water Quality and Treatment question pattern

Every graph below is calculated only from this selection.

Questions by year

Year-wise coverage for Water and Waste Water Quality and Treatment. Each bar uses a separate theme-derived color.

Difficulty distribution

How the classified questions are distributed by difficulty.

Easy 49 51%
Medium 46 47.9%
Hard 1 1%

Question type distribution

MCQ, numerical, multiple-select and other formats found in these papers.

MCQ 53 55.2%
Numerical Answer Type (NAT) 32 33.3%
MSQ 6 6.3%
Fill in the blanks 5 5.2%

Subject weightage

Top subjects by unique question coverage.

Civil Engineering
96 Qs

Most asked topics

Top topics across the included previous year papers.

Environmental Engineering
96 Qs

Subtopic coverage

Top subtopics inside this exact selection.

Water and Waste Water Quality and Treatment
96 Qs

Paper coverage

Question coverage for the most populated papers. Every active PYP paper remains listed below.

Civil Engineering (CE) 2026
6 Qs
Civil Engineering (CE) 2026
5 Qs
Civil Engineering (CE) 2025 [Session 1]
5 Qs
Civil Engineering (CE) 2025 [Session 2]
5 Qs
Civil Engineering (CE) 2024 [Session 2]
3 Qs
Civil Engineering (CE) 2024 [Session 1]
2 Qs
Civil Engineering (CE) 2022 [Session 2]
3 Qs
Civil Engineering (CE) 2020 [Session 2]
5 Qs
Civil Engineering (CE) 2019 [Session 2]
4 Qs
Civil Engineering (CE) 2018 [Session 2]
4 Qs
Civil Engineering (CE) 2017 [Session 2]
4 Qs
Civil Engineering (CE) 2016 [Session 1]
4 Qs
Civil Engineering (CE) 2016 [Session 2]
4 Qs
Civil Engineering (CE) 2015 [Session 2]
3 Qs
Civil Engineering (CE) 2015 [Session 1]
1 Qs
Civil Engineering (CE) 2014 [Session 1]
5 Qs
Civil Engineering (CE) 2014 [Session 2]
5 Qs
Civil Engineering (CE) 2013
4 Qs
Civil Engineering (CE) 2012
6 Qs
Civil Engineering (CE) 2011
5 Qs
Civil Engineering (CE) 2010
3 Qs
Civil Engineering (CE) 2009
4 Qs
Civil Engineering (CE) 2008
6 Qs

Included previous year papers

Newest papers appear first. Sort by year, question coverage or name.

PaperYear / sessionQuestions in this viewOpen
Civil Engineering (CE) 202620266View paper
Civil Engineering (CE) 202620265View paper
Civil Engineering (CE) 2025 [Session 1]20255View paper
Civil Engineering (CE) 2025 [Session 2]20255View paper
Civil Engineering (CE) 2024 [Session 1]20242View paper
Civil Engineering (CE) 2024 [Session 2]20243View paper
Civil Engineering (CE) 2022 [Session 2]20223View paper
Civil Engineering (CE) 2020 [Session 2]20205View paper
Civil Engineering (CE) 2019 [Session 2]20194View paper
Civil Engineering (CE) 2018 [Session 2]20184View paper
Civil Engineering (CE) 2017 [Session 2]20174View paper
Civil Engineering (CE) 2016 [Session 1]20164View paper
Civil Engineering (CE) 2016 [Session 2]20164View paper
Civil Engineering (CE) 2015 [Session 1]20151View paper
Civil Engineering (CE) 2015 [Session 2]20153View paper
Civil Engineering (CE) 2014 [Session 1]20145View paper
Civil Engineering (CE) 2014 [Session 2]20145View paper
Civil Engineering (CE) 201320134View paper
Civil Engineering (CE) 201220126View paper
Civil Engineering (CE) 201120115View paper
Civil Engineering (CE) 201020103View paper
Civil Engineering (CE) 200920094View paper
Civil Engineering (CE) 200820086View paper

All Water and Waste Water Quality and Treatment previous year questions

Practice every matching question in batches of 20, with every available option.

1
2014 · Civil Engineering · Environmental Engineering · Water and Waste Water Quality and Treatment
Civil Engineering (CE) 2014 [Session 1]
Some of the nontoxic metals normally found in natural water are
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2
2014 · Civil Engineering · Environmental Engineering · Water and Waste Water Quality and Treatment
Civil Engineering (CE) 2014 [Session 1]
16 MLD of water is flowing through a 2.5 km long pipe of diameter 45 cm. The chlorine at the rate of 32 kg/d is applied at the entry of this pipe so that disinfected water is obtained at the exit. There is a proposal to increase the flow through this pipe to 22 MLD from 16 MLD. Assume the dilution coefficient, n = 1. The minimum amount of chlorine (in kg per day) to be applied to achieve the same degree of disinfection for the enhanced flow is
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3
2014 · Civil Engineering · Environmental Engineering · Water and Waste Water Quality and Treatment
Civil Engineering (CE) 2014 [Session 1]
The potable water is prepared from turbid surface water by adopting the following treatment sequence.
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4
2014 · Civil Engineering · Environmental Engineering · Water and Waste Water Quality and Treatment
Civil Engineering (CE) 2014 [Session 1]
For a sample of water with the ionic composition shown in the figure below, the carbonate and non-carbonate hardness concentrations (in mg/l as CaCO3), respectively are:
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5
2014 · Civil Engineering · Environmental Engineering · Water and Waste Water Quality and Treatment
Civil Engineering (CE) 2014 [Session 1]
A straight 100 m long raw water gravity main is to carry water from an intake structure to the jack well of a water treatment plant. The required flow through this water main is 0.21 m3/s. Allowable velocity through the main is 0.75 m/s. Assume f = 0.01, g = 9.81 m/s2. The minimum gradient (in cm/100 m length) to be given to this gravity main so that the required amount of water flows without any difficulty is ______________
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6
2014 · Civil Engineering · Environmental Engineering · Water and Waste Water Quality and Treatment
Civil Engineering (CE) 2014 [Session 2]
The dominating microorganisms in an activated sludge process reactor are
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7
2014 · Civil Engineering · Environmental Engineering · Water and Waste Water Quality and Treatment
Civil Engineering (CE) 2014 [Session 2]
A suspension of sand like particles in water with particles of diameter 0.10 mm and below is flowing into a settling tank at 0.10 m³/s. Assume g = 9.81 m/s², specific gravity of particles = 2.65, and kinematic viscosity of water = 1.0105×10⁻⁶ m²/s. The minimum surface area (in m²) required for this settling tank to remove particles of size 0.06 mm and above with 100% efficiency is __________
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8
2014 · Civil Engineering · Environmental Engineering · Water and Waste Water Quality and Treatment
Civil Engineering (CE) 2014 [Session 2]
A surface water treatment plant operates round the clock with a flow rate of 35 m³/min. The water temperature is 15 °C and jar testing indicated an alum dosage of 25 mg/l with flocculation at a Gt value of 4×10⁴ producing optimal results. The alum quantity required for 30 days (in kg) of operation of the plant is __________
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9
2014 · Civil Engineering · Environmental Engineering · Water and Waste Water Quality and Treatment
Civil Engineering (CE) 2014 [Session 2]
An effluent at a flow rate of 2670 m³/d from a sewage treatment plant is to be disinfected. The laboratory data of disinfection studies with a chlorine dosage of 15 mg/l yield the model \[ N_t = N_0 e^{-0.145t} \] where N_t = number of micro-organisms surviving at time t (in min.) and N_0 = number of micro-organisms present initially (at t = 0). The volume of disinfection unit (in m³) required to achieve a 98% kill of micro-organisms is __________
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10
2014 · Civil Engineering · Environmental Engineering · Water and Waste Water Quality and Treatment
Civil Engineering (CE) 2014 [Session 2]
A waste water stream (flow = 2 m³/s, ultimate BOD = 90 mg/l) is joining a small river (flow = 12 m³/s, ultimate BOD = 5 mg/l). Both water streams get mixed up instantaneously. Cross-sectional area of the river is 50 m². Assuming the de-oxygenation rate constant, k = 0.25/day, the BOD (in mg/l) of the river water, 10 km downstream of the mixing point is
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11
2015 · Civil Engineering · Environmental Engineering · Water and Waste Water Quality and Treatment
Civil Engineering (CE) 2015 [Session 1]
Consider a primary sedimentation tank (PST) in a water treatment plant with Surface Overflow Rate (SOR) of 40 m³/m².d. The diameter of the spherical particle which will have 90 percent theoretical removal efficiency in this tank is __________ μm. Assume that settling velocity of the particles in water is described by Stokes’ Law. Given: Density of water = 1000 kg/m³, Density of particle = 2650 kg/m³, g = 9.81 m/s², Kinematic viscosity of water (ν) = 1.10 x 10⁻⁶ m²/s
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12
2015 · Civil Engineering · Environmental Engineering · Water and Waste Water Quality and Treatment
Civil Engineering (CE) 2015 [Session 2]
A water treatment plant of capacity, 1 m³/s has filter boxes of dimensions 6 m × 10 m. Loading rate to the filters is 120 m³/day/m². When two of the filters are out of service for back washing, the loading rate (in m³/day/m²) is __________.
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13
2015 · Civil Engineering · Environmental Engineering · Water and Waste Water Quality and Treatment
Civil Engineering (CE) 2015 [Session 2]
Ultimate BOD of a river water sample is 20 mg/L. BOD rate constant (natural log) is 0.15 day⁻¹. The respective values of BOD (in %) exerted and remaining after 7 days are:
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14
2015 · Civil Engineering · Environmental Engineering · Water and Waste Water Quality and Treatment
Civil Engineering (CE) 2015 [Session 2]
In a wastewater treatment plant, primary sedimentation tank (PST) designed at an overflow rate of 32.5 m³/day/m² is 32.5 m long, 8.0 m wide and liquid depth of 2.25 m. If the length of the weir is 75 m, the weir loading rate (in m³/day/m) is __________.
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15
2016 · Civil Engineering · Environmental Engineering · Water and Waste Water Quality and Treatment
Civil Engineering (CE) 2016 [Session 1]
Crown corrosion in a reinforced concrete sewer is caused by:
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16
2016 · Civil Engineering · Environmental Engineering · Water and Waste Water Quality and Treatment
Civil Engineering (CE) 2016 [Session 1]
Match the items in Group – I with those in Group – II and choose the right combination.
Group – IGroup – II
P. Activated sludge process1. Nitrifiers and denitrifiers
Q. Rising of sludge2. Autotrophic bacteria
R. Conventional nitrification3. Heterotrophic bacteria
S. Biological nitrogen removal4. Denitrifiers
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17
2016 · Civil Engineering · Environmental Engineering · Water and Waste Water Quality and Treatment
Civil Engineering (CE) 2016 [Session 1]
Effluent from an industry ‘A’ has a pH of 4.2. The effluent from another industry ‘B’ has double the hydroxyl (OH⁻) ion concentration than the effluent from industry ‘A’. pH of effluent from the industry ‘B’ will be ______
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18
2016 · Civil Engineering · Environmental Engineering · Water and Waste Water Quality and Treatment
Civil Engineering (CE) 2016 [Session 1]
The 2-day and 4-day BOD values of a sewage sample are 100 mg/L and 155 mg/L, respectively. The value of BOD rate constant (expressed in per day) is ______
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19
2016 · Civil Engineering · Environmental Engineering · Water and Waste Water Quality and Treatment
Civil Engineering (CE) 2016 [Session 2]
A water supply board is responsible for treating 1500 m³/day of water. A settling column analysis indicates that an overflow rate of 20 m/day will produce satisfactory removal for a depth of 3.1 m. It is decided to have two circular settling tanks in parallel. The required diameter (expressed in m) of the settling tanks is ________
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20
2016 · Civil Engineering · Environmental Engineering · Water and Waste Water Quality and Treatment
Civil Engineering (CE) 2016 [Session 2]
The hardness of a ground water sample was found to be 420 mg/L as CaCO₃. A softener containing ion exchange resins was installed to reduce the total hardness to 75 mg/L as CaCO₃ before supplying to 4 households. Each household gets treated water at a rate of 540 L/day. If the efficiency of the softener is 100%, the bypass flow rate (expressed in L/day) is ________
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Showing 20 of 96 questions