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

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


A.


B.


C.


D.


Options are :

  • D
  • A
  • B
  • C

Answer :C

Lead caulked joints are used for laying:


Options are :

  • C.I. pipes
  • Stone ware pipes
  • Earthern ware pipes
  • G.I. pipes

Answer :Earthern ware pipes

The moisture content of a sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is:


Options are :

  • 50%
  • 10%
  • 25%
  • 5%

Answer :50%

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

Depletion of ozone layer in the outer atmosphere may cause:


Options are :

  • Heart disorder
  • Lung cancer
  • Skin cancer
  • Bronchitis

Answer :Skin cancer

The sludge does not contain waste water from:


Options are :

  • Kitchen sinks
  • Wash basins
  • Bath rooms
  • Toilets

Answer :Toilets

The use of coarse screens for the disposal of sewage, may be dispensed with by:


Options are :

  • Comminutor
  • None of these
  • Shredder

Answer :Comminutor Shredder

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

The sewer which resists sulphide corrosion, is:


Options are :

  • R.C.C. sewer
  • Cast iron sewer
  • Brick sewer
  • None of these
  • Lead sewer

Answer :Lead sewer

Lead acetate test in sewer manhole is done to test the presence of:


Options are :

  • Hydrogen sulphide
  • Diesel vapours
  • Carbondioxide gas
  • Methane gas

Answer :Hydrogen sulphide

The self-cleansing velocity of water flowing through pipe lines, is:


Options are :

  • 0.25 metre/sec
  • 2 metres/sec
  • 0.5 metre/sec
  • 1 metre/sec

Answer :2 metres/sec

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

A five day B.O.D. at 15C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15C for standard sewage is 0.1 kg/day, the population equivalent is:


Options are :

  • 1000
  • 100
  • 5000
  • 10000

Answer :10000

At the junction of sewers:


Options are :

  • Top of larger sewer is kept lower
  • Tops of both the sewers are at the same level
  • None of these
  • Top of smaller sewer is kept lower

Answer :None of these

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:


Options are :

  • 30 m
  • 24 m
  • 20 m
  • 16 m

Answer :24 m

Waste Water Engineering MCQ Practice Questions (Civil Eng) Set 7

The design period in years for pumping plants, is:


Options are :

  • 1
  • 3 to 5
  • 5 to 10
  • 2 to 3

Answer :5 to 10

Which one of the following gases is most significant as air pollutant:


Options are :

  • Sulphurdioxide
  • Carbondioxide
  • Oxygen
  • Nitrogen

Answer :Sulphurdioxide

The rainfall at any place may be determined by:


Options are :

  • Its frequency
  • Its direction
  • Its intensity
  • All the above

Answer :All the above

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

Water content of sewage is about:


Options are :

  • 99.9%
  • 9.9%
  • 90%
  • 95%

Answer :99.9%

The water carried sewerage system removes:


Options are :

  • Domestic sewage
  • All the above
  • Industrial sewage
  • Storm sewage

Answer :All the above

Sluge banks are formed if sewage is disposed of in:


Options are :

  • Seas
  • None of these
  • Rivers
  • Lakes

Answer :Seas

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

If the peak discharge of a storm water drain (S.W. Drain) is e.xpected to exceed 150 cumecs, the free board to be provided, is:


Options are :

  • 50 cm
  • 90 cm
  • 80 cm
  • 100 cm

Answer :100 cm

The factor responsible for purification of sewage in river is:


Options are :

  • Dissolved oxygen in water
  • Temperature
  • Hydrology
  • Turbulence
  • All the above

Answer :All the above

The pH value of fresh sewage is usually:


Options are :

  • More than 7
  • Equal to zero
  • Less than 7
  • Equal to 7

Answer :More than 7

PH value of sludge during alkaline regression stage, is:


Options are :

  • Less than 7
  • Less than 6
  • More than 7
  • More than 6

Answer :More than 7

For large sewers, maximum distance between manholes may be:


Options are :

  • 100 m
  • 200 m
  • 50 m
  • 300 m
  • 400 m

Answer :300 m

The first stage of neutral process of sludge digestion, is:


Options are :

  • Acid regression
  • None of these
  • Acid fermentation
  • Alkaline fermentation

Answer :Acid fermentation

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

The spacing of bars of perforations of fine screens used for the treatment of sewage, is:


Options are :

  • 5 to 8 mm
  • 3 to 5 mm
  • 8 to 10 mm
  • 2 to 3 mm

Answer :2 to 3 mm

The maximum diameter of sewers adopted in the designs is:


Options are :

  • 2.0 m
  • 3.0 m
  • 4.0 m
  • 1.0 m

Answer :3.0 m

Primary treatment of sewage consists of removal of:


Options are :

  • Large suspended organic solids
  • None of these
  • Sand and girt
  • Floating materials
  • Oil and grease

Answer :Large suspended organic solids

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

The average temperature of sewage is:


Options are :

  • 25C
  • 15C
  • 10C
  • 20C
  • 30C

Answer :20C

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


Options are :

  • 1 in 120
  • None of these
  • 1 in 100
  • 1 in 60

Answer :1 in 100

The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is:


Options are :

  • 20 m
  • 75 m
  • 30 m
  • 45 m

Answer :45 m

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

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