Option A: has the dimensions of 1/pressure
Option B: increases with pressure
Option C: is large when fluid is more compressible
Option D: is independent of pressure and viscosity
Correct Answer: increases with pressure ✔
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Option A: higher
Option B: lower
Option C: same
Option D: higher/lower depending on temperature
Correct Answer: higher ✔
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Option A: remains same
Option B: increases
Option C: decreases
Option D: shows erratic behaviour
Correct Answer: shows erratic behaviour ✔
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Option A: more
Option B: less
Option C: same
Option D: more or less depending on size of glass tube
Correct Answer: more ✔
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Option A: 10m/sec2
Option B: 9.81 m/sec2
Option C: 10.2/m sec
Option D: 9.75 m/sec2
Correct Answer: 10m/sec2 ✔
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Option A: it is incompressible
Option B: it has uniform viscosity
Option C: it has zero viscosity
Option D: it is frictionless
Correct Answer: it is at rest. ✔
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Option A: quasi static
Option B: steady state
Option C: laminar
Option D: uniform
Correct Answer: uniform ✔
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Option A: at norma] pressure of 760 mm
Option B: at 4°C temperature
Option C: at mean sea level
Option D: all the above
Correct Answer: all the above ✔
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Option A: compressibility
Option B: surface tension
Option C: cohesion
Option D: adhesion
Correct Answer: cohesion ✔
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Option A: adhesion
Option B: cohesion
Option C: viscosity
Option D: compressibility
Correct Answer: cohesion ✔
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Option A: 0°C
Option B: 0°K
Option C: 4°C
Option D: 100°C
Correct Answer: 0°C ✔
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Option A: The process of decomposing the organic matter under controlled anaerobic conditions, is called sludge digestion
Option B: Sludge digestion is carried out in sludge tank
Option C: The gases produced in sludge digestion process, contain 75% carbon dioxide
Option D: The gases produced in sludge digestion process, contain 75% methane
Correct Answer: The gases produced in sludge digestion process, contain 75% carbon dioxide ✔
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Option A: The mixture of water and waste products, is called sewage
Option B: The treated sewage effluents, are generally used for irrigating the crops
Option C: The process of collecting, treating and disposing off the sewage, is called sewerage
Option D: The old convergence system was definitely better than water carried sewerage system
Correct Answer: The old convergence system was definitely better than water carried sewerage system ✔
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Option A: Anaerobic bacteria flourish in the absence of oxygen
Option B: Aerobic bacteria flourish in the presence of oxygen
Option C: Facultative bacteria flourish with or without oxygen
Option D: All the above
Correct Answer: All the above ✔
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Option A: The circular section of sewers provides maximum hydraulic mean depth
Option B: The circular sewers are provided for separate sewerage system
Option C: The circular sewers work efficiently if the sections run at least half full
Option D: All the above
Correct Answer: All the above ✔
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Option A: Inlets are provided on the road surface at the lowest point for draining rain water
Option B: Inlets are generally provided at an interval of 30 m to 60 m along straight roads
Option C: Inlets having horizontal openings, are called horizontal inlets
Option D: All the above
Correct Answer: All the above ✔
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Option A: Indore method of composting involves decomposition under aerobic conditions
Option B: Bangalore method of composting involves decomposing under anaerobic conditions
Option C: Fully stabilised refuse by the Bangalore method of compositing is a powdery mass called humus
Option D: all of these
Correct Answer: all of these ✔
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Option A: pH value indicates acidity and alkalinity of sewage
Option B: In acidic sewage, the pH value is less than 7
Option C: In alkaline sewage, the pH value is more than 7
Option D: All the above
Correct Answer: All the above ✔
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Option A: The boning rod is used for checking the levels of the sewer inverts
Option B: Manhole covers are made circular for the convenience of the cleaning staff
Option C: A manhole is classified as shallow manhole if its depth is less than 0.9 m
Option D: All the above
Correct Answer: All the above ✔
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Option A: Turbidity is more in strong sewage
Option B: The black colour indicates septic sewage
Option C: The sewage omits offensive odours after four hours
Option D: All the above
Correct Answer: All the above ✔
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Option A: A heap
Option B: Plateau
Option C: Windrow
Option D: None of these
Correct Answer: None of these ✔
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Option A: Carbondioxide
Option B: Methane
Option C: Ammonia
Option D: Carbon monoxide
Correct Answer: Methane ✔
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Option A: Over flow rate
Option B: Surface loading
Option C: Over flow velocity
Option D: All the above
Correct Answer: All the above ✔
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Option A: 30 minutes
Option B: 1 hour
Option C: 1 hour and 30 minutes
Option D: 2 hours
Correct Answer: 2 hours ✔
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Pick up the incorrect statement from the following for allowing workers to enter sewers__________?
Option A: The particular manhole and one manhole on upstream and one manhole on downstream should remain open for 30 minutes
Option B: Proper tests for the presence of poisonous gases must be carried out
Option C: The men entering the manhole should be advised to smoke in the sewer
Option D: Warning signals should be erected
Correct Answer: The men entering the manhole should be advised to smoke in the sewer ✔
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Option A: 0.50 m/sec
Option B: 0.60 m/sec
Option C: 0.70 m/sec
Option D: 0.75 m/sec
Correct Answer: 0.75 m/sec ✔
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Option A: 25,000 to 35,000 litres/sqm/day
Option B: 40,000 to 50,000 litres/sqm/day
Option C: 50,000 to 60,000 litres/sqm/day
Option D: 80,000 to 100,000 litres/sqm/day
Correct Answer: 50,000 to 60,000 litres/sqm/day ✔
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Option A: Top of smaller sewer is kept lower
Option B: Top of larger sewer is kept lower
Option C: Tops of both the sewers are at the same level
Option D: None of these
Correct Answer: None of these ✔
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Option A: Unexpected large scale infiltration of stream water
Option B: Unexpected increase in the population
Option C: Under estimates of maximum and average flows
Option D: All of the above
Correct Answer: All of the above ✔
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Option A: Main sewer
Option B: Outfall sewer
Option C: Branch sewer
Option D: House sewer
Correct Answer: Outfall sewer ✔
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Option A: 16 m
Option B: 20 m
Option C: 24 m
Option D: 30 m
Correct Answer: 24 m ✔
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Option A: Q = [(4 + )/(18 + )] q
Option B: Q = [(18 + P)/(4 + )] q
Option C: Q = [(18 + )/(4 + )] q
Option D: Q = [(5 + )/((15 + )] q
Correct Answer: Q = [(18 + )/(4 + )] q ✔
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Option A: Hydrogen sulphide
Option B: Carbon dioxide
Option C: Methane
Option D: Oxygen
Correct Answer: Carbon dioxide ✔
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Option A: Imhoff tanks
Option B: Trickling filters
Option C: Sludge sedimentation tanks
Option D: None of these
Correct Answer: Trickling filters ✔
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Option A: 1 in 60
Option B: 1 in 100
Option C: 1 in 120
Option D: None of these
Correct Answer: 1 in 100 ✔
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Option A: Raising low lying areas by dumping
Option B: Concreting
Option C: Both A. and B.
Option D: Neither A. nor B
Correct Answer: Concreting ✔
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Option A: Total organic solids
Option B: Total solids
Option C: Total in organic solids
Option D: Settleable solids
Correct Answer: Settleable solids ✔
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Option A: When sewage is fresh
Option B: When diluting water has high dissolved oxygen content
Option C: When diluting water is used for water supply near the point of sewage disposed
Option D: When the diluting water is having flow currents
Correct Answer: When diluting water is used for water supply near the point of sewage disposed ✔
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Option A: 1 in 100 upward
Option B: 1 in 500 upward
Option C: 1 in 100 downward
Option D: 1 in 503 upward
Correct Answer: 1 in 100 downward ✔
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Option A: H2SO4
Option B: HNO3
Option C: HCl
Option D: None of these
Correct Answer: H2SO4 ✔
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Option A: More than the self-cleansing velocity
Option B: Less than the self-cleansing velocity
Option C: Less than 10 m/sec
Option D: More than 20 m/sec
Correct Answer: Less than the self-cleansing velocity ✔
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Option A: Top side
Option B: Bottom side
Option C: Horizontal side
Option D: All sides
Correct Answer: Bottom side ✔
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Option A: Distances 150 m to 300 m
Option B: Upper ends of branch sewers
Option C: Every change in the size of sewers
Option D: All the above
Correct Answer: All the above ✔
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Option A: Q/(B × D)
Option B: Q/(L × D)
Option C: Q/L
Option D: Q/(B × L)
Correct Answer: Q/(B × L) ✔
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Option A: Bio-Chemical Oxygen Demand (B.O.D.)
Option B: Dissolved Oxygen (D.O.)
Option C: Chemical Oxygen Demand (C.O.D.)
Option D: None of these
Correct Answer: Dissolved Oxygen (D.O.) ✔
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Option A: 90 %
Option B: 95 %
Option C: 99 %
Option D: 9.9 %
Correct Answer: 9.9 % ✔
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Option A: Parabolic
Option B: Circular
Option C: Rectangular
Option D: New egged
Correct Answer: Circular ✔
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Option A: Hydrology
Option B: Dissolved oxygen in water
Option C: Temperature
Option D: All the above
Correct Answer: All the above ✔
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Option A: 45 %
Option B: 50 %
Option C: 55 %
Option D: 60 %
Correct Answer: 55 % ✔
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Option A: Imhoff Cone
Option B: Turbid meter
Option C: Potentiometer
Option D: None of these
Correct Answer: Potentiometer ✔
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The normal value of over flow rates for plain primary sedimentation tanks, ranges between__________?
Option A: 25,000 to 35,000 litres/sqm/day
Option B: 40,000 to 50,000 litres/sqm/day
Option C: 50,000 to 60,000 litres/sqm/day
Option D: 80,000 to 100,000 litres/sqm/day
Correct Answer: 40,000 to 50,000 litres/sqm/day ✔
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Option A: A gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided
Option B: The outlet invert level is kept 5 to 7.5 cm below the inlet invert level
Option C: The minimum width of septic level is 90 cm
Option D: The depth of tank is kept equal to its width
Correct Answer: The depth of tank is kept equal to its width ✔
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Option A: Combined system
Option B: Partially separate system
Option C: Separate system
Option D: None of these
Correct Answer: Separate system ✔
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Option A: Fertilizer
Option B: Building material
Option C: Chemical for lowering B.O.D.
Option D: Base material for paints
Correct Answer: Fertilizer ✔
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Option A: Separate system
Option B: Combined system
Option C: Partially combined system
Option D: None of these
Correct Answer: Combined system ✔
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Option A: 0°C
Option B: 15°C
Option C: 20°C
Option D: 25°C
Correct Answer: 0°C ✔
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Option A: Manholes are provided in sewer pipes at suitable intervals
Option B: Catch basins are generally provided in sewers for carrying drainage discharge
Option C: Inlets are generally provided in all sewers
Option D: None of these
Correct Answer: Inlets are generally provided in all sewers ✔
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Option A: 25 %
Option B: 50 %
Option C: 10 %
Option D: 5 %
Correct Answer: 50 % ✔
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Option A: Initial demand
Option B: First stage demand
Option C: Carbonaceous demand
Option D: All of these
Correct Answer: All of these ✔
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Option A: 1.250 D
Option B: 1.350 D
Option C: 1.425 D
Option D: 1.625 D
Correct Answer: 1.625 D ✔
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Option A: A jar
Option B: A breaker
Option C: A test tube
Option D: An Imhoff cone
Correct Answer: An Imhoff cone ✔
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Option A: 65 to 70%
Option B: 70 to 75%
Option C: 75 to 80%
Option D: 85%
Correct Answer: 75 to 80% ✔
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Option A: Lower end of ventilating column
Option B: Upper end of ventilating column
Option C: Upper end of the manhole
Option D: First step in manhole
Correct Answer: Upper end of ventilating column ✔
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Option A: A sewer drops from a height
Option B: A branch sewer joins the main sewer at higher level
Option C: A lamp is inserted to check obstruction
Option D: None of these
Correct Answer: A branch sewer joins the main sewer at higher level ✔
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Option A: Comminutor
Option B: Shredder
Option C: Both A. and B.
Option D: Neither A. nor B.
Correct Answer: C. Both A. and B. ✔
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Option A: Potassium permanganate
Option B: Sulphuric acid and napthamine
Option C: Phenol-di -sulphuric acid and potassium hydroxide
Option D: None of these
Correct Answer: Phenol-di -sulphuric acid and potassium hydroxide ✔
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Option A: Free board of 0.3 m may be provided
Option B: The baffles or tees are extended up to top level of scum
Option C: The clear space between the baffle top and covering slab is about 7.5 cm
Option D: All the above
Correct Answer: All the above ✔
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Option A: Highly resistant to sulphide corrosion
Option B: Highly impervious
Option C: Hydraulically efficient because of their smooth interior surface
Option D: Especially suited to pressure pipes
Correct Answer: Especially suited to pressure pipes ✔
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Option A: 1.095
Option B: 1.085
Option C: 1.075
Option D: 1.065
Correct Answer: 1.095 ✔
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Option A: Without entry ladders
Option B: Without manhole covers
Option C: With depths more than 3.5 m
Option D: Having drains at different levels
Correct Answer: Having drains at different levels ✔
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Option A: 200 ppm
Option B: 225 ppm
Option C: 250 ppm
Option D: None of these
Correct Answer: 250 ppm ✔
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Option A: Must be of adequate size to avoid over flow
Option B: Must flow under gravity ½ to ¾ full
Option C: Must be laid at least 2 to 3 m deep to collect /water from the basements
Option D: All the above
Correct Answer: All the above ✔
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Option A: Mechanized receipt
Option B: Mechanized segregation
Option C: Mechanized pulverising of refuse
Option D: All of these
Correct Answer: All of these ✔
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Option A: w r S S
Option B: w r1/2
Option C: w r S
Option D: w r2/3
Correct Answer: w r S S ✔
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Option A: d² (0.011d + 0.785H)/Q
Option B: d (0.022d + 0.085H)/Q
Option C: d (0.785d + 0.011H)/Q
Option D: d (0.285d + 0.011H)/Q
Correct Answer: d² (0.011d + 0.785H)/Q ✔
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Option A: At the end of septic tanks
Option B: On manholes
Option C: With a W.C. trap
Option D: At the beginning of sewer line
Correct Answer: C. With a W.C. trap ✔
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Option A: More than 7
Option B: Less than 7
Option C: Less than 6
Option D: More than 6
Correct Answer: More than 7 ✔
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Option A: 52.5 cm
Option B: 67.5 cm
Option C: 82.5 cm
Option D: None of these
Correct Answer: None of these ✔
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Option A: Both A and R is true and R is the correct explanation of A
Option B: Both A and R is true but R is not a correct explanation of A
Option C: A is true but R is false
Option D: A is false but R is true
Correct Answer: Both A and R is true and R is the correct explanation of A ✔
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Option A: Circular septic tanks
Option B: Rectangular septic tanks
Option C: Circular Imhoff double tanks with bottom hoppers
Option D: Circular Imhoff double storey tanks without bottom hoppers
Correct Answer: Circular Imhoff double storey tanks without bottom hoppers ✔
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Option A: 100 mm dia.
Option B: 150 mm dia.
Option C: 225 mm dia.
Option D: All of these
Correct Answer: 225 mm dia. ✔
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Option A: D’ = 0.64 D
Option B: D’ = 0.74 D
Option C: D’ = 0.84 D
Option D: D’ = 0.94 D
Correct Answer: D’ = 0.84 D ✔
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Option A: The shape is rectangular
Option B: Detention period is 2 hours
Option C: The velocity of flow is restricted to 0.30 m/minute
Option D: All the above
Correct Answer: All the above ✔
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Option A: 3 m
Option B: 3.5 m
Option C: 4 m
Option D: 4.5 m
Correct Answer: 3 m ✔
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A sewer running partially full and hurried with back filled, fails in compression due to__________?
Option A: Weight of the pipe
Option B: Weight of the back fill
Option C: Superimposed traffic loads
Option D: All the above
Correct Answer: All the above ✔
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Option A: Ammonia and nitrogen
Option B: Nitrogen and organic nitrogen
Option C: Organic nitrogen and ammonia
Option D: All the above
Correct Answer: All the above ✔
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Option A: Liberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen
Option B: Liberation of nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates
Option C: Liberation of nitrogen-formation of nitrates-formation of nitrites-liberation of ammonia
Option D: Formation of nitrates-formation of nitrites-liberation of nitrates-liberation of nitrates
Correct Answer: Liberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen ✔
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Option A: 10 cm
Option B: 15 cm
Option C: 20 cm
Option D: 25 cm
Correct Answer: 15 cm ✔
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Option A: The materials separated by screens, is called screenings
Option B: The screenings are disposed off either by burning or by burial or by dumping
Option C: The process of burning the screenings, is known as compositing
Option D: All the above
Correct Answer: All the above ✔
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Option A: One pipe
Option B: Two pipes
Option C: Three pipes
Option D: Four pipes
Correct Answer: Three pipes ✔
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Option A: Less than 0.01 mm
Option B: Less than 0.05 mm
Option C: Less than 0.1 mm
Option D: Greater than 0.1 mm
Correct Answer: Greater than 0.1 mm ✔
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Option A: The bottom is silted
Option B: The bottom is scoured
Option C: Both silting and scouring occur at the bottom
Option D: Neither silting nor scouring occurs at the bottom
Correct Answer: Neither silting nor scouring occurs at the bottom ✔
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The spacing of bars of perforations of fine screens used for the treatment of sewage, is__________?
Option A: 2 to 3 mm
Option B: 3 to 5 mm
Option C: 5 to 8 mm
Option D: 8 to 10 mm
Correct Answer: 2 to 3 mm ✔
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Option A: 10 litres
Option B: 15 litres
Option C: 20 litres
Option D: 25 litres
Correct Answer: 20 litres ✔
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In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient,__________?
Option A: Is only provided
Option B: Is doubled
Option C: Is trebled
Option D: Is not enough
Correct Answer: Is doubled ✔
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Option A: 0.05 m/sec
Option B: 0.09 m/sec
Option C: 1.25 m/sec
Option D: None of these
Correct Answer: 0.09 m/sec ✔
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Option A: Domestic sewage
Option B: Industrial sewage
Option C: Storm sewage
Option D: All the above
Correct Answer: All the above ✔
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Option A: Horizontally
Option B: Vertically
Option C: At an angle of 30°
Option D: At an angle of 60°
Correct Answer: Vertically ✔
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Option A: Carbondioxide gas
Option B: Hydrogen sulphide gas
Option C: Methane gas
Option D: Petrol vapours
Correct Answer: Methane gas ✔
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