Waste Water Engineering MCQs Latest – Competitive Civil Engineering MCQs
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Latest Civil Engineering MCQs
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Latest Waste Water Engineering Mcqs
The most occurred mcqs of Waste Water Engineering in past papers. Past papers of Waste Water Engineering Mcqs. Past papers of Waste Water Engineering Mcqs . Mcqs are the necessary part of any competitive / job related exams. The Mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Waste Water Engineering Mcqs. The Important series of Waste Water Engineering Mcqs are given below:
The self-cleansing velocity of water flowing through pipe lines, is___________________ ?
A. 2 metres/sec
B. 0.5 metre/sec
C. 1 metre/sec
D. 0.25 metre/sec
The first stage of neutral process of sludge digestion, is__________________?
A. Acid fermentation
B. Alkaline fermentation
C. Acid regression
D. None of these
The formula V = (1/n) r2/3____________________?
A. Bazin’s formula
B. Chezy’s formula
C. Kutter’s formula
D. Manning’s formula
The maximum diameter of sewers adopted in the designs is_______________?
A. 2.0 m
B. 1.0 m
C. 3.0 m
D. 4.0 m
Facultative bacteria survive in_____________________?
A. The absence of oxygen
B. The presence of oxygen
C. Both cases A. and B.
D. Neither A. nor B.
The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is____________________?
A. 30 m
B. 20 m
C. 45 m
D. 75 m
The underground sewers are more subjected to________________?
A. Bending force
B. Compressive force
C. Tensile force
D. Shearing force
Ventilating shafts are provided to a sewer line at every__________________?
A. 150 m
B. 100 m
C. 200 m
D. 300 m
Boussinesq’s equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is__________________?
A. pt = 3H3p/2 Z5
B. pt = 3H3p/2Z5
C. pt = 2H3p/3 Z5
D. pt = 2 3p/3Z5
For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed________________?
A. 1.5
B. 2.5
C. 2.0
D. 3.0
If the pH value of sewage is 7__________________?
A. It is alkaline
B. It is acidic
C. It is neutral
D. None of these
The normal values of over flow rates for secondary sedimentation tanks, ranges between__________________?
A. 25,000 to 35,000 litres/sqm/day
B. 50,000 to 60,000 litres/sqm/day
C. 40,000 to 50,000 litres/sqm/day
D. 80,000 to 10,000 litres/sqm/day
The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is __________________?
A. 5.5 m
B. 5 m
C. 6.5 m
D. 7 m
For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is____________________?
A. Cement concrete sewers
B. Cast iron sewers
C. Glazed bricks sewers
D. Stone ware sewers
The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is____________________?
A. 1.5
B. 3.0
C. 2.0
D. 4.0
Large diameter sewers subjected to external pressure alone, are reinforced ______________________?
A. Near the outer surface of the pipe
B. Near the inner surface of the pipe
C. Both A. and B.
D. With elliptical cage
The liquid wastes from kitchens, bath rooms and wash basins, is not called________________?
A. Sullage
B. Liquid waste
C. Sewage
D. None of these
The detention time (t) of a settling tank, may be defined as the time required for_________________?
A. A particle to travel from top surface to bottom sludge zone
B. A particle to travel along its length
C. The flow of sewage to fill the tank
D. None of these
The effluent of a septic tank is_________________?
A. Fit for discharge into any open drain
B. As good as that from a complete treatment
C. Foul and contains dissolved and suspended solids
D. None of these
The design period of sewage treatment works in normally_________________?
A. 30 – 40 years
B. 15 – 20 years
C. 5 – 10 years
D. 40 – 50 years
In Chezy’s formula V = C rs for calculating the velocity of flow in circular sewer of diameter running full, the value of hydraulic mean radius is_______________?
A. D /2
B. D
C. D/3
D. D/4
For sewer mains of 0.5 to 1 m diameter, the ratio of maximum daily sewage flow to the average daily sewage flow is assumed__________________?
A. 2.5
B. 2.0
C. 1.5
D. 3.0
The recommended detention period for grit chambers is_______________?
A. 1 minute
B. 3 minutes
C. 2 minutes
D. 5 minutes
Waste Water Engineering MCQs – Civil Engineering MCQs
If is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is___________________?
A. 1.25 D
B. D
C. 1.5 D
D. 1.75 D
A rainfall may be classified as acidic if its pH value is less or equal to________________?
A. 7
B. 6
C. 5
D. 6.5
For house drainage minimum gradient is__________________?
A. 1 in 60
B. 1 in 10
C. 1 in 80
D. 1 in 400
A rain sanitary sewer is constructed to carry_________________ ?
A. Sanitary sewage
B. Surface water
C. Storm sewage
D. Ground water
The drop man holes are generally provided in sewers for____________________?
A. Large town ships
B. Industrial areas
C. Hilly town ships
D. Cities in plains
For design purposes, the normal rate of infiltration of ground water into the sewer, is___________________?
A. 1000 litres/km/cm
B. 500 litres/km/cm
C. 1500 litres/km/cm
D. 2000 litres/km/cm
The algae dies out in the zone of_____________________?
A. Degradation
B. Recovery
C. Active decomposition
D. Cleaner water
Assertion A. : Discharging the effluents from the oxidation ponds just up stream of lakes or reservoirs is undesirable. Reason (R) : The discharged algae get settled in the reservoirs and cause anaerobic decomposition and other water qualities_________________?
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is false but R is true
D. A is true but R is false
The dimensions of a rectangular settling tank are: length 24 m, width 6 m and depth 3 m. If 2 hour detention period for tanks is recommended, the rate of flow of sewage per hour, is_____________________?
A. 208 cu.m
B. 204 cu.m
C. 212 cu.m
D. 216 cu.m
Disposal to sewage in large cities, is done in__________________?
A. Oxidation
B. Dilution
C. Irrigation
D. Purification
The digested sludge from septic tanks, is removed after a maximum period of__________________?
A. 3 years
B. 4 years
C. 3.5 years
D. 5 years
The presence of free ammonia in sewage, is detected by___________________?
A. Boiling
B. Adding sulphuric acid
C. Adding potassium permanganate
D. Phenol-di-sulphuric acid
The porosity of sediments in sewer pipes, is usually taken as___________________?
A. 0.011
B. 0.010
C. 0.012
D. 0.013
Engineering Economy MCQs – Civil Engineering
The minimum diameter of sewer to be adopted is_________________?
A. 12.5 cm
B. 10 cm
C. 15 cm
D. 25 cm
The sewerage system consists of______________________?
A. Lateral sewer
B. House sewer
C. Branch sewer
D. All of these
Oxidation process results in the formation of___________________?
A. Nitrates
B. Carbon dioxide
C. Sulphates
D. All the above
The angle subtended by the surface of sewer water with partial flow, at sewer centre is 120°, the depth of sewerage is________________________?
A. 25 cm
B. 20 cm
C. 40 cm
D. 50 cm
If the grit in grit chambers is 4.5 million litres per day, its cleaning is done____________________?
A. Manually
B. Hydraulically
C. Mechanically
D. Electrically
The ratio of depths at partial flo________________?
A. 0 –
B. 1 –
C. ½ (1 –
D. ½ (1 –
With self cleansing velocity in sewers___________________?
A. Scouring occurs at bottom
B. Silting occurs at bottom
C. Both silting and scouring occur at bottom
D. Neither silting nor scouring occurs at bottom
As compared to fresh river water, sea water contains oxygen_________________?
A. 10% more
B. 20% less
C. 10% less
D. 20% more
Imhoff cone is used to determine_____________________?
A. Settleable solids
B. Dissolved solids
C. Suspended solids
D. None of these
Discrete or granular particles change their_________________ ?
A. Shape
B. Size
C. Weight
D. None of these
The ratio of design discharge to the surface area of a sedimentation tank is called____________________?
A. Overflow rate
B. Surface loading
C. Overflow velocity
D. All of these
Which one of the following resists hydrogen sulphide corrosion ?
A. Glazed stone wares
B. R.C.C.
C. Asbestos cement
D. Glazed ware
In olden days the type of section adopted in trunk and out fall sewers was__________________?
A. Egg shaped
B. Horse shoe shaped
C. Parabolic shaped
D. Circular shaped
In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is_________________?
A. 2.50
B. 2.25
C. 2.55
D. 2.65
House connections to the laterals is generally made by___________________?
A. P.C.C.
B. R.C.C.
C. Cast iron
D. Glazed stonewares
In R.C. sewer pipes, the percentage longitudinal reinforcement to the cross-sectional area of concrete is kept________________?
A. 5.0
B. 10.0
C. 2.0
D. 0.25
MCQs of Civil Engineering Latest
Rate of flow of sewage is generally assumed__________________?
A. Equal to the rate of water supply
B. More than the rate of water supply
C. Less than the rate of water supply
D. At 150 litres per capita
If the depth of partial flow in a sewer of diameter 2 m, is 50 cm, its wetted perimeter is____________________ ?
A. 0/2
B. 1/3
C. 0/3
D. 2 /3
In sewers the gas generally found, is_________________?
A. Carbon dioxide (CO2)
B. Hydrogen sulphide (H2S)
C. Methane (CH4)
D. All the above
The small sewers are cleaned by____________________?
A. Flushing
B. Wooden pills
C. Cane rodding
D. None of these
If is the diameter of upper circular portion, the area of cross-section of a standard egg shaped sewer, is____________________?
A. D²
B. D²
C. D²
D. D²
In sewage, the solids in mg per litre is__________________?
A. 1000 to 1500
B. 500 to 1000
C. 100 to 500
D. 1500 to 2000
The gas evolved in sewers is________________?
A. Hydrogen sulphide
B. Carbon dioxide
C. Methane
D. All of these
If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains__________________?
A. Hydrogen sulphide
B. Methane
C. Carbon dioxide
D. Oxygen
The sewer which transports the sewage to the point of treatment, is called________________?
A. Branch sewer
B. Out-fall sewer
C. House sewer
D. Main sewer
To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of_______________?
A. Nitric acid
B. Sulphuric acid
C. Hydrochloric acid
D. Citric acid
If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is__________________?
A. 1 in 60
B. 1 in 120
C. 1 in 100
D. None of these
In 1000 kg of sewage, the total solids approximate___________________?
A. 0.5 to 1.0 kg
B. 5 kg to 7.5 kg
C. 1 kg to 2.0 kg
D. 7.5 kg to 10 kg
Before discharging the foul sewage into rivers, it is generally treated by_____________________?
A. Sedimentation
B. Screening
C. Oxidation
D. All the above
Aerobic activity is maximum_______________?
A. In freshly produced sewage
B. In sewer treatment plants
C. At sewer pipes
D. None of these
Sewer manholes are generally provided at________________?
A. The change of direction
B. The change of gradient
C. The junctions of sewers
D. All of these
hydraulically equivalent, the relationship which holds good, is _______________?
A. D8/3 = 4 b8/3
B. D2/3 = 4 b2/3
C. D3/8 = 4 b3/8
D. D3/2 = 4 b3/2
Sewer pipes need be checked for_________________?
A. Maximum flow
B. Minimum flow
C. Both A. and B.
D. None of these
In septic tanks, decomposition of organic bacteria, is done by_____________________?
A. Anaerobic bacteria
B. Both types of bacterias
C. Aerobic bacteria
D. None of these
The sewerage system originates from__________________?
A. House sewers
B. Branch sewers
C. Lateral sewers
D. Main sewers
During purification process of sewage the gas given off, is________________?
A. Carbon dioxide
B. Ammonia
C. Hydrogen
D. All the above
Drop manholes at the junctions of sewer lines, are provided if________________?
A. Invert level of a branch sewer is more than 60 cm that of the main sewer
B. Ordinary manhole cannot be built
C. Sewer line runs along a main road
D. Two sewer lines intersect
Strength of Materials MCQs – Civil Engineering
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. 110 cm
B. 100 cm
C. 120 cm
D. 150 cm
Fresh sewage may become stale in_________________?
A. Two to three hours
B. One hour
C. Three to four hours
D. Six hours
The standard B.O.D. of water is taken for_________________?
A. 2 days
B. 1 day
C. 3 days
D. 5 days
The gradient of sewers depends upon_________________?
A. Diameter of the sewer
B. Velocity of flow
C. Discharge
D. All the above
Removal of oil and grease from sewage, is known____________________?
A. Filtration
B. Skimming
C. Screening
D. None of these
The ratio of minimum hourly flow to the average flow of sewage is_________________?
A. 1/2
B. 1/3
C. 1/4
D. 3/4
The coagulant widely used for sewage treatment, is_________________?
A. Ferric sulphate
B. Ferric chloride
C. Alum
D. Chlorinated copperas
For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed________________?
A. 5 ppm
B. 4 ppm
C. 3 ppm
D. 10 ppm
In SI units the power of sound is represented in __________________?
A. Joules
B. Kgs
C. Newtons
D. Watts
The width of a rectangular sewer is twice its depth while discharging 1.5 m/sec. The width of the sewer is______________?
A. 0.88 m
B. 0.68 m
C. 1.36 m
D. 1.76 m
For providing an Indian type W.C., the R.C.C. slabs in the toilet portion__________________?
A. Should be kept 20 cm above the adjacent portion
B. Should be sunk by 20 cm
C. Should be sunk by 50 cm
D. Need not be sunk
Flocculated particles do not change their___________________?
A. Shape
B. Size
C. Weight
D. None of these
Theory Of Structures Mcqs Latest – Civil Engineering Mcqs
When drainage to sewage ratio is 20, the peak dry weather flow is_______________?
A. Slightly more than 5% of the design discharge
B. Slightly less than 5% of the design discharge
C. 20% of the design discharge
D. None of these
The non-clog pump which permits solid matter to pass out with the liquid sewage, is________________?
A. Centrifugal pump
B. Pneumatic ejector
C. Reciprocating pump
D. None of these
Which one of the following tests is used for testing sewer pipes ?
A. Ball test
B. Water test
C. Mirror test
D. All of these
The sewage is pumped up_______________?
A. From flat areas
B. From low lying areas
C. From basements
D. All the above
If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is___________________?
A. 1 in 100
B. 1 in 60
C. 1 in 120
D. None of these
The sewer pipe which carries sewage from a building for immediate disposal is______________?
A. House sewer
B. Intercepting sewer
C. Lateral sewer
D. Main sewer
Clogging of sewers, is caused due to_______________?
A. Low discharge
B. Silting
C. Greasy and oily matters
D. All the above
In sewage having fully oxidised organic matter, the nitrogen exists in the form of________________?
A. Free ammonia
B. Nitrates
C. Nitrites
D. Aluminoid nitrogen
Dry water flow in a combined sewer, is______________________?
A. Domestic sewage
B. Industrial sewage
C. Storm water
D. Inclusive of domestic and industrial sewage but excludes storm water
Assertion A.: The minimum self cleansing velocity in the sewer, at least once a day, must be generated. Reason (R): If certain deposition takes place and is not removed, it obstructs free flow and causes further deposition leading to complete blocking of the sewer?
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is false but R is true
D. A is true but R is false
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 D.O. concentration was 5 mg/l. The BOD of raw sewerage is______________________?
A. 200 mg/l
B. 100 mg/l
C. 300 mg/l
D. 400 mg/l
If is the rugosity coefficient, is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula V = (1/n) r2/3 s1/2 evolved by_________________?
A. Bazin
B. Manning
C. Chezy
D. Kutter
The sewage treatment in septic tanks is due to__________________?
A. Anaerobic decomposition
B. Parasitic decomposition
C. Aerobic decomposition
D. None of these
In a sludge digestion tank if the moisture content of sludge V1 litres is reduced from p1 % to p2 % the volume V2 is____________________?
A. [(100 – P1)/(100 + P2)] V1
B. [(100 + P1)/(100 – P2)] V1
C. [(100 – P1)/(100 – P2)] V1
D. [(100 + P2)/(100 – P1)] V1
You are asked to design sewer pipes of diameters 0.4 m to 0.9 m at maximum flow, you will assume the sewer flow running at___________________?
A. Two third full
B. Half full
C. Full depth
D. Three fourth full
For a peak discharge of 0.0157 cumec, with a velocity of 0.9 m/sec, the diameter of the sewer main, is________________?
A. 12 cm
B. 10 cm
C. 15 cm
D. 18 cm
The most effective arrangement for diverting excess storm water into a natural drainage, is____________________?
A. Overflow weir
B. Leaping weir
C. Siphon spill way
D. None of these
For estimating the peak run off the rational formula Q = 0.0278 KpA was evolved by______________?
A. Lloyd Davis
B. Kinchling
C. Frubling
D. All the above
The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is______________________?
A. 413.5 cm/sec
B. 313.5 cm/sec
C. 213.5 cm/sec
D. 500 cm/sec
The laying of sewers is done with____________________?
A. Theodolite
B. Magnetic compass
C. Level
D. Clinometer
For detecting the nitrites in the sewage, the matching colour may be developed by adding_________________?
A. Phenol-disulphuric acid potassium hydroxide
B. Sulphuric acid and napthamine
C. Potassium permanganate
D. None of these
Fresh sewage is generally_____________________?
A. Alkaline
B. Highly decomposed
C. Acidic
D. A source of objectionable odour
It is customary to design a sewer for D.W.F. on the basis of________________?
A. Twice the average demand
B. Average demand
C. Thrice the average demand
D. Four times the average demand
The following is the physical characteristic of sewage___________________?
A. Colour
B. Turbidity
C. Odour
D. All the above
For laying a sewer line in a trench of 2 m width, an offset line is marked on the ground parallel to the given centre line at a distance of___________________?
A. 100 cm
B. 140 cm
C. 120 cm
D. 160 cm