Waste Water Engineering MCQ Practice Questions (Civil Eng) Set 8

The detention period for plain sedimentation water tanks, is usually:


Options are :

  • 16 to 24 hours
  • 4 to 8 hours
  • 24 to 36 hours
  • 8 to 16 hours

Answer :4 to 8 hours

Waste Water Engineering MCQ Practice Questions (Civil Eng) Set 9

In sewers the highest non-scouring velocity is achieved in:


Options are :

  • Stone ware sewers
  • Cast iron sewers
  • Cement concrete sewers
  • Glazed bricks sewers

Answer :Glazed bricks sewers

Maximum permissible velocity 1.5 m/sec, is adopted in drains:


Options are :

  • With beds of rocks and gravels
  • None of these
  • Lined with stones

Answer :With beds of rocks and gravels Lined with stones

For evaporation and measurement of settlable solids, the apparatus used, is:


Options are :

  • A jar
  • An Imhoff cone
  • A breaker
  • A test tube

Answer :An Imhoff cone

If D is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is:


Options are :

  • 1.5 D
  • 2 D
  • 1.25 D
  • 1.75 D
  • D

Answer :1.5 D

A rain sanitary sewer is constructed to carry:


Options are :

  • Storm sewage
  • Sanitary sewage
  • All the above
  • Surface water
  • Ground water

Answer :Sanitary sewage

Disposal to sewage in large cities, is done in:


Options are :

  • Putrifaction
  • Oxidation
  • Dilution
  • Irrigation

Answer :Dilution

Waste Water Engineering MCQ Practice Questions (Civil Eng) Set 1

For the COD test of sewage, organic matter is oxidised by K2Cr207 in the presence of:


Options are :

  • None of these
  • HNO3
  • H2SO4
  • HCl

Answer :H2SO4

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:


Options are :

  • 4 hours
  • 5 hours
  • 2 hours
  • 3 hours

Answer :4 hours

Fresh sewage may become stale in:


Options are :

  • Ten hours
  • One hour
  • Six hours
  • Two to three hours
  • Three to four hours

Answer :Three to four hours

Waste Water Engineering MCQ Practice Questions (Civil Eng) Set 10

Self-cleansing velocity is:


Options are :

  • Velocity of water in a pressure filter
  • Velocity at dry weather flow
  • Velocity of water at flushing
  • Velocity at which no accumulation remains in the drains

Answer :Velocity at which no accumulation remains in the drains

Pick up the correct statement from the following:


Options are :

  • The solubility of oxygen in sewage is 95% that is in distilled water
  • Only very fresh sewage contains some dissolved oxygen
  • In treated sewage, 4 PPm of D.O. is essential
  • All the above

Answer :All the above

For trunk and out-fall, the type of sewers generally used, is:


Options are :

  • Standard egg shaped
  • Horse shoe shaped
  • Circular shaped
  • Semi-elliptical shaped
  • Parabolic shaped

Answer :Horse shoe shaped

Waste Water Engineering MCQ Practice Questions (Civil Eng) Set 11

The clarigesters are:


Options are :

  • Circular Imhoff double tanks with bottom hoppers
  • Circular Imhoff double storey tanks without bottom hoppers
  • Circular septic tanks
  • Rectangular septic tanks

Answer :Circular Imhoff double storey tanks without bottom hoppers

Sewer ventilating columns are generally placed at:


Options are :

  • Upper ends of branch sewers
  • Distances 150 m to 300 m
  • All the above
  • Every change in the size of sewers

Answer :All the above

Pick up the correct statement from the following:


Options are :

  • All the above
  • The time required by water to reach the outlet of a catchment from the most remote point, is called time of concentration
  • The maximum rate of storm run off is called peak drainage discharge
  • The period after which the entire area starts contributing to the run off, is called the time of concentration
  • Rational method of estimating peak run off, may be used precisely for areas less than 50 hectares

Answer :All the above

Waste Water Engineering MCQ Practice Questions (Civil Eng) Set 2

The coagulant widely used for sewage treatment, is:


Options are :

  • Alum
  • Chlorinated copperas
  • Ferric sulphate
  • Ferric chloride

Answer :Ferric chloride

Pick up the correct statement from the following:


Options are :

  • In acidic sewage, the pH value is less than 7
  • In alkaline sewage, the pH value is more than 7
  • Fresh sewage is generally alkaline
  • pH value indicates acidity and alkalinity of sewage
  • All the above

Answer :All the above

A manhole is classified as shallow if its depth is between:


Options are :

  • 1.2 to 1.50 m
  • 0.9 to 1.20 m
  • 0.5 to 0.7 m
  • 0.4 to 0.5 m
  • 0.7 to 0.9 m

Answer :0.7 to 0.9 m

Waste Water Engineering MCQ Practice Questions (Civil Eng) Set 3

Pick up the incorrect statement from the following:


Options are :

  • Septic tanks are completely covered and high vent shafts are provided for the escape of foul gases
  • None of these
  • Septic tanks are generally classified as tanks which work on the principle of anaerobic decomposition
  • Septic tanks are generally provided a detention period of 12 to 36 hours
  • Septic tanks are horizontal continuous flow type of sedimentation tanks

Answer :None of these

A drop manhole is provided if:


Options are :

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

Answer :A branch sewer joins the main sewer at higher level

Flocculated particles do not change their:


Options are :

  • Size
  • Shape
  • None of these
  • Weight

Answer :None of these

Waste Water Engineering MCQ Practice Questions (Civil Eng) Set 4

The liquid wastes from kitchens, bath rooms and wash basins, is not called:


Options are :

  • Liquid waste
  • None of these
  • Sullage
  • Sewage

Answer :Sewage

Dry water flow in a combined sewer, is:


Options are :

  • Inclusive of domestic and industrial sewage but excludes storm water
  • Industrial sewage
  • Domestic sewage
  • Storm water

Answer :Inclusive of domestic and industrial sewage but excludes storm water

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 20C, B.O.D. of the sewage is:


Options are :

  • 150 mg/l
  • 200 mg/l
  • 50 mg/l
  • 100 mg/l
  • 250 mg/l

Answer :250 mg/l

Waste Water Engineering MCQ Practice Questions (Civil Eng) Set 5

Chlorination of water is done for the removal of:


Options are :

  • Hardness
  • Sediments
  • Suspended solids
  • Bacterias

Answer :Bacterias

The small sewers are cleaned by:


Options are :

  • Cane rodding
  • Flushing
  • Wooden pills
  • None of these

Answer :Flushing

Pick up the correct statement from the following:


Options are :

  • Method of composting involves decomposing under anaerobic conditions
  • Method of composting involves decomposition under aerobic conditions
  • All of these
  • Fully stabilised refuse by the Bangalore method of compositing is a powdery mass called humus

Answer :All of these

Waste Water Engineering MCQ Practice Questions (Civil Eng) Set 6

For design purposes, the normal rate of infiltration of ground water into the sewer, is:


Options are :

  • 500 litres/km/cm
  • 2500 litres/km/cm
  • 2000 litres/km/cm
  • 1500 litres/km/cm
  • 1000 litres/km/cm

Answer :2000 litres/km/cm

The sewer pipe which carries sewage from a building for immediate disposal is:


Options are :

  • Intercepting sewer
  • Lateral sewer
  • Main sewer
  • House sewer

Answer :House sewer

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