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Environmental Engineering MCQs | Environmental Engineering Short Questions(MCQs) & Answers

Questions
41 The design discharge for the combined sewer system shall be taken as
A equal to rainfall
B rainfall + DWF
C rainfall + 2 DWF
D rainfall + 6 DWF

Answer: rainfall + 2 DWF
42 The minimum and maximum diameters of sewers shall preferably be
A 15 cm and 100 cm
B 15 cm and 300 cm
C 30 cm and 450 cm
D 60 cm and 300cm

Answer: 15 cm and 300 cm
43 Most suitable section of sewer in separate sewage system is
A Rectangular Section
B Circular Section
C Standard Form Of Egg Shaped Sewer
D Modified Egg Shaped Section

Answer: Circular Section

Environmental Pollution – Multiple Choice Questions with Answers | EBook

44 The velocity of flow does not depend on
A Grade Of Sewer
B Length Of Sewer
C Hydraulic Mean Depth Of Sewer
D Roughness Of Sewer

Answer: Length Of Sewer
45 The effect of increasing diameter of sewer on the self cleansing velocity is
A To Decrease It
B To Increase It
C Fluctuating
D Nil

Answer: To Increase It
46 The characteristics of fresh and septic sewage respectively are
A Acidic And Alkaline
B Alkaline And Acidic
C Both Acidic
D Both Alkaline

Answer: Alkaline And Acidic
47 The pathogens can be killed by
A Nitrification
B Chlorination
C Oxidation
D None Of The Above

Answer: Chlorination
48 Sewage treatment units are normally designed for
A 5-10 years
B 15-20 years
C 30-40 years
D 40-50 years

Answer: 15-20 years
49 Standard BOD is measured at
A 20°C - 1day
B 25°C- 3day
C 20°C - 5day
D 30°C- 5day

Answer: 20°C - 5day
50 The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by
A TOD>BOD>COD
B TOD>COD>BOD
C BOD>COD>TOD
D COD>BOD>TOD

Answer: TOD>COD>BOD
51 Select the correct statement.
A 5 day BOD is the ultimate BOD
B 5 day BOD is greater than 4 day BOD keeping other conditions same
C 5 day BOD is less than 4 day BOD keeping other conditions same
D BOD does nof depend on time

Answer: 5 day BOD is less than 4 day BOD keeping other conditions same
52 In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be
A 100 ppm
B 200 ppm
C 300 ppm
D 400 ppm

Answer: 200 ppm
53 Dissolved oxygen in streams is
A Maximum At Noon
B Minimum At Noon
C Maximum At Midnight
D Same Throughout The Day

Answer: Maximum At Noon
54 The means of access for inspection and cleaning of sewer line is known as
A Inlet
B Manhole
C Drop Manhole
D Catch Basin

Answer: Manhole
55 Sewage treatment units are designed for
A Maximum Flow Only
B Minimum Flow Only
C Average Flow Only
D Maximum And Minimum Flow

Answer: Average Flow Only
56 Laying of sewers is usually done with the help of
A A Theodolite
B A Compass
C Sight Rails And Boning Rods
D A Plane Table

Answer: Sight Rails And Boning Rods
57 If the sewage contains grease and fatty oils, these are removed in
A Grit Chambers
B Detritus Tanks
C Skimming Tanks
D Sedimentation Tanks

Answer: Skimming Tanks
58 Generally the detention period for grit chambers is kept as
A 1 minute
B 5 minutes
C 2-4 hours
D 12 hours

Answer: 1 minute
59 Which of the following unit works in anaerobic conditions?
A Sludge Digestion Tank
B Sedimentation Tank
C Activated Sludge Treatment
D Trickling Filters

Answer: Sludge Digestion Tank
60 The working conditions in imhoff tanks are
A Aerobic Only
B Anaerobic Only
C Aerobic In Lower Compartment And Anaerobic In Upper Compartment
D Anaerobic In Lower Compartment And Aerobic In Upper Compartment

Answer: Anaerobic In Lower Compartment And Aerobic In Upper Compartment

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