Competitive Civil Engineering MCQs - Waste Water Engineering MCQs Latest

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Competitive Civil Engineering MCQs – Waste Water Engineering MCQs Latest

This post is comprising of latest “Civil Engineering MCQs – Waste Water Engineering MCQs“. Here you’ll get latest civil engineering mcqs for written test, interview with answers. If you want to improve your knowledge regarding civil engineering then read these mcqs of Design of Steel Structures.

Latest Civil Engineering MCQs

By practicing these MCQs of Civil Engineering MCQs – Waste Water Engineering Mcqs, an individual for exams performs better than before. This post comprising of civil engineering objective questions and answers related to “Waste Water Engineering Mcqs“. As wise people believe “Perfect Practice make a Man Perfect”. It is therefore practice these mcqs of civil engineering to approach the success. Tab this page to check “Latest Waste Water Engineering Mcqs” for the preparation of competitive mcqs, FPSC mcqs, PPSC mcqs, SPSC mcqs, KPPSC mcqs, AJKPSC mcqs, BPSC mcqs, NTS mcqs, PTS mcqs, OTS mcqs, Atomic Energy mcqs, Pak Army mcqs, Pak Navy mcqs, CTS mcqs, ETEA mcqs and others.

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 most dangerous pollutant in vehicular emissions is____________________?

A. CO
B. CO2
C. SO2
D. O3

The sewer which collects the discharge from a collecting system and delivers it to a treatment plant, is known_____________________?

A. Lateral sewer
B. House sewer
C. Branch sewer
D. Sewer outfall

A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is_____________________?

A. 0.35 m/sec
B. 0.30 m/sec
C. 0.40 m/sec
D. 0.45 m/sec

The settlement of a particle in sedimentation tank, is affected by_____________________?

A. Viscosity of water
B. Velocity of flow
C. Size and shape of solid
D. All the above

If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is________________?

A. 3 hours
B. 2 hours
C. 4 hours
D. 5 hours

The minimum recommended diameter of sewers, is_________________?

A. 10 cm
B. 5 cm
C. 15 cm
D. 20 cm

The suitable cross-section of sewers to carry combined flow, is__________________?

A. Rectangular
B. Egg shaped
C. Circular
D. Horse shoe shaped

In sewers the highest non-scouring velocity is achieved in________________?

A. Glazed bricks sewers
B. Cement concrete sewers
C. Cast iron sewers
D. Stone ware sewers

If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of__________________?

A. Recovery
B. Active decomposition
C. Degradation
D. Cleaner water

For trunk and out-fall, the type of sewers generally used, is_____________________?

A. Circular shaped
B. Standard egg shaped
C. Horse shoe shaped
D. Parabolic shaped

The most efficient cross section of sewers in a separate sewerage system is__________________?

A. Rectangular
B. Circular
C. Parabolic
D. New egged

The stone ware sewers_________________?

A. Are manufactured from clays and shale
B. Are used for carrying sewage and drainage from houses
C. After casting are dried and burnt at temperature 150°C, 700°C and 1200°C
D. All the above

A manhole is classified as shallow if its depth is between_________________?

A. 0.5 to 0.7 m
B. 0.4 to 0.5 m
C. 0.7 to 0.9 m
D. 0.9 to 1.20 m

In case of sewer lines_________________?

A. Test for straightness is carried out with the help of a lamp and mirror
B. Water test is carried out to check water tightness of the joints
C. Obstruction test is carried out with the help of smooth ball of diameter 13 mm
D. All the above

In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through non-monsoon periods, is_____________________?

A. 10
B. 5
C. 15
D. 20

A circular sewer section is preferred to because__________________?

A. It provides maximum hydraulic mean depth
B. It provides maximum area for a given perimeter
C. It is cheaper in construction
D. All the above

If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is_________________?

A. 100 mg/l
B. 50 mg/l
C. 150 mg/l
D. 250 mg/l

Waste Water Engineering MCQs – Civil Engineering MCQs

A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of______________?

A. Hydrogen sulphide gas
B. Carbon dioxide gas
C. Methane gas
D. Petrol vapours

The asbestos cement pipes are generally laid___________________?

A. At an angle of 30°
B. Vertically
C. Horizontally
D. At an angle of 60°

The water carried sewerage system removes__________________?

A. Industrial sewage
B. Domestic sewage
C. Storm sewage
D. All the above

The flow velocity in detritus tanks is________________?

A. 1.25 m/sec
B. 0.09 m/sec
C. 0.05 m/sec
D. None of these

In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient,______________?

A. Is trebled
B. Is doubled
C. Is only provided
D. Is not enough

The rate of accumulation of sludge per person per year, is_______________________?

A. 15 litres
B. 10 litres
C. 20 litres
D. 25 litres

The spacing of bars of perforations of fine screens used for the treatment of sewage, is_______________?

A. 2 to 3 mm
B. 5 to 8 mm
C. 3 to 5 mm
D. 8 to 10 mm

In sewers designed with self cleansing velocity________________?

A. The bottom is scoured
B. The bottom is silted
C. Both silting and scouring occur at the bottom
D. Neither silting nor scouring occurs at the bottom

Hazen’s formula VS = 418 (GS – Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter______________________?

A. Less than 0.05 mm
B. Less than 0.01 mm
C. Less than 0.1 mm
D. Greater than 0.1 mm

An inverted siphon is designed generally for____________________?

A. Two pipes
B. One pipe
C. Three pipes
D. Four pipes

Pick up the correct statement from the following _________________?

A. The process of burning the screenings, is known as compositing
B. The screenings are disposed off either by burning or by burial or by dumping
C. The materials separated by screens, is called screenings
D. All the above

The minimum diameter of a sewer is kept __________________?

A. 20 cm
B. 15 cm
C. 10 cm
D. 25 cm

Nitrogen cycle of sewage, is____________________?

A. Liberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen
B. Liberation of nitrogen-formation of nitrates-formation of nitrites-liberation of ammonia
C. Liberation of nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates
D. Formation of nitrates-formation of nitrites-liberation of nitrates-liberation of nitrates

Kjeldahl nitrogen is a mixture of___________________?

A. Nitrogen and organic nitrogen
B. Ammonia and nitrogen
C. Organic nitrogen and ammonia
D. All the above

A sewer running partially full and hurried with back filled, fails in compression due to_________________?

A. Weight of the back fill
B. Weight of the pipe
C. Superimposed traffic loads
D. All the above

Theory Of Structures Mcqs Latest – Civil Engineering Mcqs

The maximum depth of sedimentation tanks, is kept__________________?

A. 3 m
B. 4 m
C. 3.5 m
D. 4.5 m

In case of Imhoff tanks_____________________?

A. Detention period is 2 hours
B. The shape is rectangular
C. The velocity of flow is restricted to 0.30 m/minute
D. All the above

If D is the diameter of a circular sewer and D’ is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is_______________?

A. D’ = 0.74 D
B. D’ = 0.64 D
C. D’ = 0.84 D
D. D’ = 0.94 D

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. 150 mm dia.
B. 100 mm dia.
C. 225 mm dia.
D. All of these

The clarigesters are_________________?

A. Rectangular septic tanks
B. Circular septic tanks
C. Circular Imhoff double tanks with bottom hoppers
D. Circular Imhoff double storey tanks without bottom hoppers

Assertion A.: A free board of 0.3 m is provided above the top sewage line in septic tanks. 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 false but R is true
D. A is true but R is false

Pick up the incorrect size of stone ware sewers_________________?

A. 67.5 cm
B. 52.5 cm
C. 82.5 cm
D. None of these

pH value of sludge during alkaline regression stage, is__________________?

A. More than 7
B. Less than 6
C. Less than 7
D. More than 6

Antisyphonage pipe is fitted_______________?

A. On manholes
B. At the end of septic tanks
C. With a W.C. trap
D. At the beginning of sewer line

The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is________________?

A. d² (0.011d + 0.785H)/Q
B. d (0.785d + 0.011H)/Q
C. d (0.022d + 0.085H)/Q
D. d (0.285d + 0.011H)/Q

weight of water, the hydraulic mean depth of the sewer and the bed slope w is the unit of the sewer, then the tractive force exerted by flowing water, is________________________?

A. w r S S
B. w r S
C. w r1/2
D. w r2/3

In a fully mechanised composting plant, involves________________?

A. Mechanized segregation
B. Mechanized receipt
C. Mechanized pulverising of refuse
D. All of these

The sewers___________________?

A. Must flow under gravity ½ to ¾ full
B. Must be of adequate size to avoid over flow
C. Must be laid at least 2 to 3 m deep to collect /water from the basements
D. All the above

If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is____________________?

A. 225 ppm
B. 200 ppm
C. 250 ppm
D. None of these

Drop manholes are the manholes___________________?

A. Without manhole covers
B. Without entry ladders
C. With depths more than 3.5 m
D. Having drains at different levels

MCQs of Civil Engineering Latest

The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is____________________?

A. 1.095
B. 1.075
C. 1.085
D. 1.065

Stone ware pipes are_______________?

A. Highly impervious
B. Highly resistant to sulphide corrosion
C. Hydraulically efficient because of their smooth interior surface
D. Especially suited to pressure pipes

In septic tanks__________________?

A. The baffles or tees are extended up to top level of scum
B. Free board of 0.3 m may be provided
C. The clear space between the baffle top and covering slab is about 7.5 cm
D. All the above

For detecting the nitrates in sewage, the colour may be developed by adding________________?

A. Sulphuric acid and napthamine
B. Potassium permanganate
C. Phenol-di -sulphuric acid and potassium hydroxide
D. None of these

The use of coarse screens for the disposal of sewage, may be dispensed with by______________?

A. Shredder
B. Comminutor
C. Both A. and B.
D. Neither A. nor B.

A drop manhole is provided if__________________?

A. A lamp is inserted to check obstruction
B. A branch sewer joins the main sewer at higher level
C. A sewer drops from a height
D. None of these

‘Cowl’ is provided at___________________?

A. Upper end of the manhole
B. Upper end of ventilating column
C. Lower end of ventilating column
D. First step in manhole

For design of sewers, percentage of sewage discharge is assumed_____________________?

A. 70 to 75%
B. 65 to 70%
C. 75 to 80%
D. 85%

For evaporation and measurement of settable solids, the apparatus used, is________________?

A. A breaker
B. A jar
C. A test tube
D. An Imhoff cone

If is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, Is_____________________?

A. 1.350 D
B. 1.250 D
C. 1.425 D
D. 1.625 D

Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to_______________?

A. First stage demand
B. Initial demand
C. Carbonaceous demand
D. All of these

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. 10 %
B. 50 %
C. 25 %
D. 5 %

Pick up the in-correct statement from the following?

A. Catch basins are generally provided in sewers for carrying drainage discharge
B. Manholes are provided in sewer pipes at suitable intervals
C. Inlets are generally provided in all sewers
D. None of these

5 days-biochemical oxygen demand (BOD5) is taken at a temperature of_________________?

A. 15°C
B. 0°C
C. 20°C
D. 25°C

In areas where light rains are uniformly distributed throughout the year, the type of sewerage system to be adopted is_______________?

A. Partially combined system
B. Combined system
C. Separate system
D. None of these

Dried sewage after treatment is used as____________________?

A. Fertilizer
B. Base material for paints
C. Chemical for lowering B.O.D.
D. Building material

In areas where rainy season is limited to a few months, the type of sewerage system recommended is__________________?

A. Partially separate system
B. Combined system
C. Separate system
D. None of these

Which one of the following statements regarding septic tanks is wrong ?

A. A gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided
B. The minimum width of septic level is 90 cm
C. The outlet invert level is kept 5 to 7.5 cm below the inlet invert level
D. The depth of tank is kept equal to its width

The normal value of over flow rates for plain primary sedimentation tanks, ranges between________________?

A. 50,000 to 60,000 litres/sqm/day
B. 40,000 to 50,000 litres/sqm/day
C. 25,000 to 35,000 litres/sqm/day
D. 80,000 to 100,000 litres/sqm/day

The pH value of sewage is determined with the help of_________________?

A. Turbid meter
B. Imhoff Cone
C. Potentiometer
D. None of these

To maintain aerobic biological activity, the moisture content of the compost mass should be about_________________?

A. 50 %
B. 45 %
C. 55 %
D. 60 %

The factor responsible for purification of sewage in river is________________?

A. Dissolved oxygen in water
B. Hydrology
C. Temperature
D. All the above

The most efficient cross-section of sewers in a combined sewerage system is________________?

A. Rectangular
B. Circular
C. Parabolic
D. New egged

Water content of sewage is about___________________?

A. 95 %
B. 90 %
C. 99 %
D. 9.9 %

The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known_________________?

A. Chemical Oxygen Demand (C.O.D.)
B. Dissolved Oxygen (D.O.)
C. Bio-Chemical Oxygen Demand (B.O.D.)
D. None of these

In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is____________________?

A. Q/(L × D)
B. Q/(B × D)
C. Q/L
D. Q/(B × L)

Sewer ventilating columns are generally placed at_______________?

A. Upper ends of branch sewers
B. Distances 150 m to 300 m
C. Every change in the size of sewers
D. All the above

In sewers the effect of scouring is more on__________________?

A. Horizontal side
B. Bottom side
C. Top side
D. All sides

In sewers the velocity of flow should not be_________________?

A. Less than 10 m/sec
B. Less than the self-cleansing velocity
C. More than the self-cleansing velocity
D. More than 20 m/sec

For the COD test of sewage, organic matter is oxidised by K2Cr2O7 in the presence of________________?

A. H2SO4
B. HCl
C. HNO3
D. None of these

The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is_________________?

A. 1 in 500 upward
B. 1 in 100 upward
C. 1 in 100 downward
D. 1 in 503 upward

Dilution method of disposing of sewage, is not preferred to_______________?

A. When diluting water has high dissolved oxygen content
B. When sewage is fresh
C. When diluting water is used for water supply near the point of sewage disposed
D. When the diluting water is having flow currents

Imhoff cone is used to measure________________?

A. Total solids
B. Total organic solids
C. Total in organic solids
D. Settleable solids

Strength of Materials MCQs – Civil Engineering

The grit and silt of the grit chambers, may not be used for_________________?

A. Raising low lying areas by dumping
B. Concreting
C. Both of the above
D. Neither of the above

If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is________________?

A. 1 in 120
B. 1 in 100
C. 1 in 60
D. None of these

The sewage treatment units in which anaerobic decomposition of organic matter is used, are called________________?

A. Sludge sedimentation tanks
B. Trickling filters
C. Imhoff tanks
D. None of these

If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains_______________?

A. Methane
B. Carbon dioxide
C. Hydrogen sulphide
D. Oxygen

If the depth of flow in a circular sewer is 1/4th of its diameter D, the wetted perimeter is______________?

A. /4
B. /2
C. /3
D. D

If q is the average sewage flow from a city of population P, the maximum sewage flow______________?

A. Q = [(18 + P)/(4 + )] q
B. Q = [(4 + )/(18 + )] q
C. Q = [(18 + )/(4 + )] q
D. Q = [(5 + )/((15 + )] q

For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is__________________?

A. 20 m
B. 16 m
C. 24 m
D. 30 m

The sewer that unloads the sewage at the point of treatment is called_________________?

A. Branch sewer
B. Outfall sewer
C. Main sewer
D. House sewer

Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for__________________?

A. Unexpected increase in the population
B. Unexpected large scale infiltration of stream water
C. Under estimates of maximum and average flows
D. All of the above

At the junction of sewers___________________?

A. Top of larger sewer is kept lower
B. Top of smaller sewer is kept lower
C. Tops of both the sewers are at the same level
D. None of these

The normal values of over flow rates for sedimentation tanks using coagulant, ranges between__________________?

A. 40,000 to 50,000 litres/sqm/day
B. 25,000 to 35,000 litres/sqm/day
C. 50,000 to 60,000 litres/sqm/day
D. 80,000 to 100,000 litres/sqm/day

To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is_________________?

A. 0.60 m/sec
B. 0.50 m/sec
C. 0.70 m/sec
D. 0.75 m/sec

Pick up the incorrect statement from the following for allowing workers to enter sewers_______________?

A. The particular manhole and one manhole on upstream and one manhole on downstream should remain open for 30 minutes
B. Warning signals should be erected
C. The men entering the manhole should be advised to smoke in the sewer
D. Proper tests for the presence of poisonous gases must be carried out

The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is____________________?

A. 1 hour
B. 30 minutes
C. 1 hour and 30 minutes
D. 2 hours

The discharge per unit plan area of a sedimentation tank, is generally called________________?

A. Surface loading
B. Over flow rate
C. Over flow velocity
D. All the above

The gas which may cause explosion in sewers, is_________________?

A. Ammonia
B. Methane
C. Carbondioxide
D. Carbon monoxide

The layers of vegetable wastes and night soil alternatively piled above the ground to form a mound, is called_______________?

A. Plateau
B. A heap
C. Windrow
D. None of these

Pick up the correct statement from the following ?

A. The black colour indicates septic sewage
B. Turbidity is more in strong sewage
C. The sewage omits offensive odours after four hours
D. All the above