Option A: 1 in 60
Option B: 1 in 80
Option C: 1 in 10
Option D: 1 in 400
Correct Answer: 1 in 60 ✔
Click for More Details
Option A: D
Option B: 1.25 D
Option C: 1.5 D
Option D: 1.75 D
Correct Answer: D ✔
Click for More Details
Option A: 1 minute
Option B: 2 minutes
Option C: 3 minutes
Option D: 5 minutes
Correct Answer: 1 minute ✔
Click for More Details
Option A: 1.5
Option B: 2.0
Option C: 2.5
Option D: 3.0
Correct Answer: 2.0 ✔
Click for More Details
Option A: 5 – 10 years
Option B: 15 – 20 years
Option C: 30 – 40 years
Option D: 40 – 50 years
Correct Answer: 15 – 20 years ✔
Click for More Details
Option A: Fit for discharge into any open drain
Option B: Foul and contains dissolved and suspended solids
Option C: As good as that from a complete treatment
Option D: None of these
Correct Answer: Fit for discharge into any open drain ✔
Click for More Details
Option A: A particle to travel along its length
Option B: A particle to travel from top surface to bottom sludge zone
Option C: The flow of sewage to fill the tank
Option D: None of these
Correct Answer: The flow of sewage to fill the tank ✔
Click for More Details
Option A: Liquid waste
Option B: Sullage
Option C: Sewage
Option D: None of these
Correct Answer: Sewage ✔
Click for More Details
Option A: Near the inner surface of the pipe
Option B: Near the outer surface of the pipe
Option C: Both A. and B.
Option D: With elliptical cage
Correct Answer: With elliptical cage ✔
Click for More Details
Option A: 1.5
Option B: 2.0
Option C: 3.0
Option D: 4.0
Correct Answer: 1.5 ✔
Click for More Details
Option A: Cast iron sewers
Option B: Cement concrete sewers
Option C: Glazed bricks sewers
Option D: Stone ware sewers
Correct Answer: Glazed bricks sewers ✔
Click for More Details
Option A: 5 m
Option B: 5.5 m
Option C: 6.5 m
Option D: 7 m
Correct Answer: 7 m ✔
Click for More Details
The normal values of over flow rates for secondary 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 10,000 litres/sqm/day
Correct Answer: 25,000 to 35,000 litres/sqm/day ✔
Click for More Details
Option A: It is acidic
Option B: It is alkaline
Option C: It is neutral
Option D: None of these
Correct Answer: It is neutral ✔
Click for More Details
Option A: 1.5
Option B: 2.0
Option C: 2.5
Option D: 3.0
Correct Answer: 1.5 ✔
Click for More Details
Option A: pt = 3H3p/2 Z5
Option B: pt = 2H3p/3 Z5
Option C: pt = 3H3p/2Z5
Option D: pt = 2 3p/3Z5
Correct Answer: pt = 3H3p/2 Z5 ✔
Click for More Details
Option A: 100 m
Option B: 150 m
Option C: 200 m
Option D: 300 m
Correct Answer: 300 m ✔
Click for More Details
Option A: Tensile force
Option B: Compressive force
Option C: Bending force
Option D: Shearing force
Correct Answer: Compressive force ✔
Click for More Details
Option A: 20 m
Option B: 30 m
Option C: 45 m
Option D: 75 m
Correct Answer: 45 m ✔
Click for More Details
Option A: The presence of oxygen
Option B: The absence of oxygen
Option C: Both cases A. and B.
Option D: Neither A. nor B.
Correct Answer: C. Both cases A. and B. ✔
Click for More Details
Option A: 1.0 m
Option B: 2.0 m
Option C: 3.0 m
Option D: 4.0 m
Correct Answer: 3.0 m ✔
Click for More Details
Option A: Chezy’s formula
Option B: Bazin’s formula
Option C: Kutter’s formula
Option D: Manning’s formula
Correct Answer: Manning’s formula ✔
Click for More Details
Option A: Acid fermentation
Option B: Acid regressio
Option C: Alkaline fermentation
Option D: None of these
Correct Answer: Acid fermentation ✔
Click for More Details
Option A: 2 metres/sec
Option B: 1 metre/sec
Option C: 0.5 metre/sec
Option D: 0.25 metre/sec
Correct Answer: 2 metres/sec ✔
Click for More Details
Option A: Nitrites are formed
Option B: Nitrates are formed
Option C: Carbondioxide is formed
Option D: Ammonia is formed
Correct Answer: Ammonia is formed ✔
Click for More Details
Option A: Branch sewers
Option B: Main sewers
Option C: Trunk sewers
Option D: All the above
Correct Answer: All the above ✔
Click for More Details
Option A: Centrifugal pump
Option B: Reciprocating pump
Option C: Pneumatic ejector
Option D: None of these
Correct Answer: Centrifugal pump ✔
Click for More Details
Option A: 1
Option B: 2 to 3
Option C: 3 to 5
Option D: 5 to 10
Correct Answer: 1 ✔
Click for More Details
Option A: Bend
Option B: Junction
Option C: Change of gradient
Option D: All the above
Correct Answer: All the above ✔
Click for More Details
Option A: 1045 mm
Option B: 1065 mm
Option C: 1075 mm
Option D: 1095 mm
Correct Answer: 1095 mm ✔
Click for More Details
Option A: Flow velocity is kept 0.09 m/sec
Option B: Detention period is kept 3 to 4 minutes
Option C: Organic and inorganic materials are separated
Option D: All the above
Correct Answer: All the above ✔
Click for More Details
Option A: Perpendicular to the direction of flow
Option B: Parallel to the direction of flow
Option C: At an angle 30° to 60° to the direction of flow
Option D: None of these
Correct Answer: At an angle 30° to 60° to the direction of flow ✔
Click for More Details
Option A: Typhoid
Option B: Cholera
Option C: Dysentery
Option D: All the above
Correct Answer: All the above ✔
Click for More Details
Option A: Chezy’s formula
Option B: Bazin’s formula
Option C: Kutter’s formula
Option D: Manning’s formula
Correct Answer: Bazin’s formula ✔
Click for More Details
Option A: 50 m
Option B: 100 m
Option C: 200 m
Option D: 300 m
Correct Answer: 300 m ✔
Click for More Details
Option A: Septic tanks are horizontal continuous flow type of sedimentation tanks
Option B: Septic tanks are generally provided a detention period of 12 to 36 hours
Option C: Septic tanks are completely covered and high vent shafts are provided for the escape of foul gases
Option D: None of these
Correct Answer: None of these ✔
Click for More Details
Option A: One pipe
Option B: Two pipes
Option C: Three pipes
Option D: Four pipes
Correct Answer: Three pipes ✔
Click for More Details
Option A: Carbondioxide
Option B: Oxygen
Option C: Nitrogen
Option D: Sulphur-dioxide
Correct Answer: Sulphur-dioxide ✔
Click for More Details
Option A: 2.30 m
Option B: 2.40 m
Option C: 2.45 m
Option D: 2.50 m
Correct Answer: 2.45 m ✔
Click for More Details
Option A: Lung cancer
Option B: Skin cancer
Option C: Bronchitis
Option D: Heart disorder
Correct Answer: Skin cancer ✔
Click for More Details
Option A: Sanitary sewage
Option B: Industrial waste
Option C: Storm sewage
Option D: None of these
Correct Answer: Storm sewage ✔
Click for More Details
Option A: The larger the sewer in size, more will be velocity
Option B: The smaller the sewer in size, less will be velocity
Option C: The larger the sewer in size, no deposition will take place
Option D: The larger the sewer in size, deposition will take place
Correct Answer: The larger the sewer in size, deposition will take place ✔
Click for More Details
Option A: 100
Option B: 1000
Option C: 5000
Option D: 10000
Correct Answer: 100 ✔
Click for More Details
Option A: 0.9 cm
Option B: 1.2 m
Option C: 1.5 m
Option D: > 1.5 m
Correct Answer: 1.5 m ✔
Click for More Details
Option A: In treated sewage, 4 ppm of D.O. is essential
Option B: Only very fresh sewage contains some dissolved oxygen
Option C: The solubility of oxygen in sewage is 95% that is in distilled water
Option D: All the above
Correct Answer: All the above ✔
Click for More Details
Option A: Stone ware pipes
Option B: Earthenware pipes
Option C: C.I. pipes
Option D: G.I. pipes
Correct Answer: Earthenware pipes ✔
Click for More Details
Option A: 50 ppm
Option B: 100 ppm
Option C: 150 ppm
Option D: 200 ppm
Correct Answer: 200 ppm ✔
Click for More Details
Option A: Equal to 7
Option B: More than 7
Option C: Less than 7
Option D: Equal to zero
Correct Answer: More than 7 ✔
Click for More Details
Option A: The maximum rate of storm runoff is called peak drainage discharge
Option B: Rational method of estimating peak run off, may be used precisely for areas less than 50 hectares
Option C: The period after which the entire area starts contributing to the runoff, is called the time of concentration
Option D: All the above
Correct Answer: All the above ✔
Click for More Details
Option A: 20 mm
Option B: 30 mm
Option C: 40 mm
Option D: 50 mm
Correct Answer: 50 mm ✔
Click for More Details
Option A: Carry sewage as gravity conduits
Option B: Are designed for generating self-cleansing velocities at different discharge
Option C: Should resist the wear and tear caused due to abrasion
Option D: All the above
Correct Answer: All the above ✔
Click for More Details
Option A: 0.05552 cumec
Option B: 0.05554 cumec
Option C: 0.05556 cumec
Option D: 0.0556 cumec
Correct Answer: 0.05556 cumec ✔
Click for More Details
Option A: The water supply pipes carry pure water free from solid particles
Option B: The water supply pipes get clogged if flow velocity is less than self cleansing velocity
Option C: The sewers may be carried up and down the hills and valleys
Option D: The sewer pipes are generally laid along level hills
Correct Answer: The water supply pipes carry pure water free from solid particles ✔
Click for More Details
Option A: Biological activity of bacteria in sewage
Option B: Solubility of gases in sewage
Option C: Viscosity of sewage
Option D: All the above
Correct Answer: All the above ✔
Click for More Details
Option A: Rivers
Option B: Seas
Option C: Lakes
Option D: None of these
Correct Answer: Seas ✔
Click for More Details
Option A: Bacterias
Option B: Suspended solids
Option C: Sediments
Option D: Hardness
Correct Answer: Bacterias ✔
Click for More Details
Option A: Inverted syphon
Option B: Depressed sewer
Option C: Sag pipe
Option D: all of these
Correct Answer: all of these ✔
Click for More Details
Option A: 1.5
Option B: 2.0
Option C: 3.0
Option D: 4.0
Correct Answer: 2.0 ✔
Click for More Details
Option A: Flow velocity 0.15 m to 0.3 m/sec is kept
Option B: Depth of 0.9 m to 1.20 m is kept
Option C: One minute of detention period is kept
Option D: All the above
Correct Answer: All the above ✔
Click for More Details
Option A: Small sewers are cleaned by flushing
Option B: Medium sewers are cleaned by cane rodding
Option C: Medium sewers may be cleaned by pills
Option D: All the above
Correct Answer: All the above ✔
Click for More Details
Option A: Methane gas
Option B: Hydrogen sulphide
Option C: Carbondioxide gas
Option D: Diesel vapours
Correct Answer: Hydrogen sulphide ✔
Click for More Details
Option A: City
Option B: Out-fall
Option C: Tail end
Option D: Any point
Correct Answer: Tail end ✔
Click for More Details
Option A: Maximum daily flow = 2 times the average daily flow
Option B: Maximum daily flow = average daily flow
Option C: Sewers are designed for minimum permissible velocity at minimum flow
Option D: All the above
Correct Answer: All the above ✔
Click for More Details
Option A: Centrifugal pump
Option B: Reciprocating pump
Option C: Pneumatic ejector
Option D: Air pressure pump
Correct Answer: Centrifugal pump ✔
Click for More Details
Option A: 2.5 to 3.0 m/sec
Option B: 3.0 to 4.0 m/sec
Option C: 3.5 to 4.5 m/sec
Option D: 4.5 to 5.5 m/sec
Correct Answer: 2.5 to 3.0 m/sec ✔
Click for More Details
Option A: Large suspended organic solids
Option B: Oil and grease
Option C: Sand and girt
Option D: Floating materials
Correct Answer: Large suspended organic solids ✔
Click for More Details
Option A: 1 in 5
Option B: 1 in 10
Option C: 1 in 15
Option D: 1 in 20
Correct Answer: 1 in 10 ✔
Click for More Details
Option A: Thyroid
Option B: Kidneys
Option C: Eyes
Option D: Ovaries/testis
Correct Answer: Ovaries/testis ✔
Click for More Details
Option A: cm/minute
Option B: cm/hour
Option C: cm/day
Option D: None of these
Correct Answer: cm/hour ✔
Click for More Details
Option A: 25 to 50 m
Option B: 50 m to 100 m
Option C: 100 m to 150 m
Option D: 150 m to 300 m
Correct Answer: 150 m to 300 m ✔
Click for More Details
Option A: Vs = 418 (Gs – Gw) d [(3T + 70)/100]
Option B: Vs = 418 (Gs – Gw)d² [(3T + 70)/100]
Option C: Vs = 218 (Gs – Gw)d² [(3T + 70)/100]
Option D: Vs = 218 (Gs – Gw)d [(3T + 70)/100]
Correct Answer: Vs = 418 (Gs – Gw)d² [(3T + 70)/100] ✔
Click for More Details
Option A: Aeration is continued till stability
Option B: Aeration is done with an admixture of previously aerated sludge
Option C: Sludge is activated by constant stirring
Option D: Water is removed by centrifugal action
Correct Answer: Aeration is done with an admixture of previously aerated sludge ✔
Click for More Details
Option A: d/D = ½ (1 – –
Option B: a/A
Option C: r/R = [1 –
Option D: All the above
Correct Answer: All the above ✔
Click for More Details
Option A: 1.39 m
Option B: 1.49 m
Option C: 1.59 m
Option D: 1.69 m
Correct Answer: 1.69 m ✔
Click for More Details
Option A: With beds of rocks and gravels
Option B: Lined with stones
Option C: Both A. and B.
Option D: Neither A. nor B.
Correct Answer: C. Both A. and B. ✔
Click for More Details
Option A: 2 days
Option B: 7 days
Option C: 12 days
Option D: 14 days
Correct Answer: 14 days ✔
Click for More Details
Option A: 30 to 40%
Option B: 40 to 60%
Option C: 60 to 80%
Option D: 80 to 90%
Correct Answer: 60 to 80% ✔
Click for More Details
Option A: 10 days
Option B: 20 days
Option C: 30 days
Option D: 60 days
Correct Answer: 30 days ✔
Click for More Details
Option A: 10 cm
Option B: 15 cm
Option C: 20 cm
Option D: All the above
Correct Answer: All the above ✔
Click for More Details
Option A: Oxygen
Option B: Nitrogen
Option C: Hydrogen
Option D: Carbon dioxide
Correct Answer: Carbon dioxide ✔
Click for More Details
Option A: Nitrates
Option B: Nitrites
Option C: Free ammonia
Option D: None of these
Correct Answer: Nitrates ✔
Click for More Details
Option A: 100 mg/l
Option B: 200 mg/l
Option C: 300 mg/l
Option D: 400 mg/l
Correct Answer: 400 mg/l ✔
Click for More Details
Option A: Velocity at dry weather flow
Option B: Velocity of water at flushing
Option C: Velocity at which no accumulation remains in the drains
Option D: Velocity of water in a pressure filter
Correct Answer: Velocity at which no accumulation remains in the drains ✔
Click for More Details
Option A: d = 0.2 B
Option B: d = 0.5 B
Option C: B = 0.2 d
Option D: B = 0.5 d
Correct Answer: d = 0.5 B ✔
Click for More Details
Option A: 30 litres/person/year
Option B: 25 litres/person/year
Option C: 30 litres/person/month
Option D: 25 litres/person/month
Correct Answer: 30 litres/person/year ✔
Click for More Details
Option A: Filtration process is used
Option B: Biological action is used
Option C: Neither A. nor B.
Option D: Both A. and B.
Correct Answer: Biological action is used ✔
Click for More Details
Option A: 2 hours
Option B: 4 hours
Option C: 6 hours
Option D: 8 hours
Correct Answer: 8 hours ✔
Click for More Details
Option A: Steel pipes
Option B: Steel shell coated from inside with cement mortar
Option C: Steel shell coated from outside with cement mortar
Option D: Both B. and C.
Correct Answer: D. Both B. and C. ✔
Click for More Details
Option A: 4 to 8 hours
Option B: 8 to 16 hours
Option C: 16 to 24 hours
Option D: 24 to 36 hours
Correct Answer: 4 to 8 hours ✔
Click for More Details
Option A: 100 cm
Option B: 90 cm
Option C: 80 cm
Option D: 50 cm
Correct Answer: 100 cm ✔
Click for More Details
Option A: Used to remove the grease and oil
Option B: Those from which sludge is skimmed out
Option C: Tanks provided with self- cleansing screens
Option D: Improved version of grit chambers
Correct Answer: Used to remove the grease and oil ✔
Click for More Details
Option A: Bazin
Option B: Crimp and Bruges
Option C: William-Hazen
Option D: Kutter
Correct Answer: Crimp and Bruges ✔
Click for More Details
Option A: Brick sewer
Option B: Cast iron sewer
Option C: R.C.C. sewer
Option D: Lead sewer
Correct Answer: Lead sewer ✔
Click for More Details
Option A: Rate of digestion of sludge is more at higher temperature
Option B: Thermophilic organisms digest the sludge if the temperature ranges from 40° to 60°C
Option C: Mesophilic organisms digest the sludge if the temperature is between 25° and 40°C
Option D: All the above
Correct Answer: All the above ✔
Click for More Details
Option A: Its intensity
Option B: Its direction
Option C: Its frequency
Option D: All the above
Correct Answer: All the above ✔
Click for More Details
Option A: Hydrogen sulphide gas in excess, may cause corrosion of concrete sewers
Option B: 4 ppm of Dissolved Oxygen (D.O.) is ensured before discharging the treated sewage in river
Option C: Solubility of oxygen in sewage is 95% of that of distilled water
Option D: All the above
Correct Answer: All the above ✔
Click for More Details
Option A: Bath rooms
Option B: Wash basins
Option C: Kitchen sinks
Option D: Toilets
Correct Answer: Toilets ✔
Click for More Details