Waste Water Engineering MCQ

Test your knowledge with important Waste Water Engineering MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30+ more Waste Water Engineering MCQs on Bissoy. Bissoy App

• The sewer which received discharge from two or more main sewers, is known as
  ক

  A trunk sewer

  খ

  An outfall sewer

  গ

  A main sewer

  ঘ

  An intercepting sewer
• The laying of sewers is done with
  ক

  Magnetic compass

  খ

  Theodolite

  গ

  Level

  ঘ

  Clinometer
• The gradient of sewers depends upon
  ক

  Velocity of flow

  খ

  Diameter of the sewer

  গ

  Discharge

  ঘ

  All the above
• Ventilating shafts are provided to a sewer line at every
  ক

  100 m

  খ

  150 m

  গ

  200 m

  ঘ

  300 m
• The sewage is pumped up
  ক

  From low lying areas

  খ

  From flat areas

  গ

  From basements

  ঘ

  All the above
• Fresh sewage is generally
  ক

  Alkaline

  খ

  Acidic

  গ

  Highly decomposed

  ঘ

  A source of objectionable odour
• The average temperature of sewage in India, is
  ক

  10°C

  খ

  15°C

  গ

  20°C

  ঘ

  25°C
• For detecting the nitrites in the sewage, the matching colour may be developed by adding
  ক

  Potassium permanganate

  খ

  Sulphuric acid and napthamine

  গ

  Phenol-di -sulphuric acid potassium hydroxide

  ঘ

  None of these
• For detecting the nitrates in sewage, the colour may be developed by adding
  ক

  Potassium permanganate

  খ

  Sulphuric acid and napthamine

  গ

  Phenol-di -sulphuric acid and potassium hydroxide

  ঘ

  None of these
• The algae dies out in the zone of
  ক

  Degradation

  খ

  Active decomposition

  গ

  Recovery

  ঘ

  Cleaner water
• Imhoff cone is used to determine
  ক

  Settleable solids

  খ

  Suspended solids

  গ

  Dissolved solids

  ঘ

  None of these
• The most effective arrangement for diverting excess storm water into a natural drainage, is
  ক

  Leaping weir

  খ

  Overflow weir

  গ

  Siphon spill way

  ঘ

  None of these
• At the junction of sewers
  ক

  Top of smaller sewer is kept lower

  খ

  Top of larger sewer is kept lower

  গ

  Tops of both the sewers are at the same level

  ঘ

  None of these
• The design period in years for pumping plants, is
  ক

  1

  খ

  2 to 3

  গ

  3 to 5

  ঘ

  5 to 10
• The most dangerous pollutant in vehicular emissions is
  ক

  CO₂

  খ

  SO₂

  গ

  CO₂

  ঘ

  O₂
• In sewers the highest non-scouring velocity is achieved in
  ক

  Glazed bricks sewers

  খ

  Cast iron sewers

  গ

  Cement concrete sewers

  ঘ

  Stone ware sewers
• In sewage having fully oxidised organic matter, the nitrogen exists in the form of
  ক

  Nitrites

  খ

  Nitrates

  গ

  Free ammonia

  ঘ

  Aluminoid nitrogen
• Traps
  ক

  Are water seals which prevent the entry of foul gases

  খ

  Are used to trap the rats entering sewers

  গ

  Dissolve the foul gases

  ঘ

  Create symphonic action to increase the quick disposal of sewerage
• Boussinesq’s equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is
  ক

  $${{\text{p}}_{\text{t}}} = \frac{{3{{\text{H}}^3}{\text{p}}}}{{2\pi {{\text{Z}}^5}}}$$

  খ

  $${{\text{p}}_{\text{t}}} = \frac{{2{{\text{H}}^3}{\text{p}}}}{{3\pi {{\text{Z}}^5}}}$$

  গ

  $${{\text{p}}_{\text{t}}} = \frac{{{\text{3}}{{\text{H}}^3}{\text{p}}}}{{2{{\text{Z}}^5}}}$$

  ঘ

  $${{\text{p}}_{\text{t}}} = \frac{{{\text{2}}\pi {{\text{H}}^3}{\text{p}}}}{{3\pi {{\text{Z}}^5}}}$$

  ঙ

  None of these
• During preliminary treatment of a sewage
  ক

  Oil and grease are removed from skimming tanks

  খ

  Floating materials are removed by screening

  গ

  Girt and sand are removed by girt chambers

  ঘ

  All the above
• Aerobic activity is maximum
  ক

  In freshly produced sewage

  খ

  At sewer pipes

  গ

  In sewer treatment plants

  ঘ

  None of these
• Which one of the following tests is used for testing sewer pipes?
  ক

  Water test

  খ

  Ball test

  গ

  Mirror test

  ঘ

  All of these
• The detention time (t) of a settling tank, may be defined as the time required for
  ক

  A particle to travel along its length

  খ

  A particle to travel from top surface to bottom sludge zone

  গ

  The flow of sewage to fill the tank

  ঘ

  None of these
• The sewer pipes
  ক

  Carry sewage as gravity conduits

  খ

  Are designed for generating self-cleansing velocities at different discharge

  গ

  Should resist the wear and tear caused due to abrasion

  ঘ

  All the above
• depends upon The Chezy’s constant C in the formula V = C
  ক

  Size of the sewer

  খ

  Shape of the sewer

  গ

  Roughness of sewer surface

  ঘ

  All the above
• In septic tanks, decomposition of organic bacteria, is done by
  ক

  Anaerobic bacteria

  খ

  Aerobic bacteria

  গ

  Both types of bacterias

  ঘ

  None of these
• The minimum recommended diameter of sewers, is
  ক

  5 cm

  খ

  10 cm

  গ

  15 cm

  ঘ

  20 cm
• The detention period for plain sedimentation water tanks, is usually
  ক

  4 to 8 hours

  খ

  8 to 16 hours

  গ

  16 to 24 hours

  ঘ

  24 to 36 hours
• The normal values of over flow rates for sedimentation tanks using coagulant, ranges between
  ক

  25,000 to 35,000 litres/sqm/day

  খ

  40,000 to 50,000 litres/sqm/day

  গ

  50,000 to 60,000 litres/sqm/day

  ঘ

  80,000 to 100,000 litres/sqm/day
• Lead acetate test in sewer manhole is done to test the presence of
  ক

  Methane gas

  খ

  Hydrogen sulphide

  গ

  Carbondioxide gas

  ঘ

  Diesel vapours