Environmental Engineering MCQs | Environmental Engineering Multiple Choice Questions with Answers

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Questions
61 The detention period for oxidation ponds is usually kept as
A 4-8 hours
B 24 hours
C 10 to 15 days
D 3 months

Answer: 10 to 15 days
62 The main disadvantage of oxidation pond is that
A Large Area Is Required For Construction
B Maintenance And Operation Cost Are High
C BOD Removal Is Very Low
D None Of The Above

Answer: Large Area Is Required For Construction
63 For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as
A 4.5 to 6.0
B 6.5 to 8.0
C 8.5 to 10.0
D 10.5 to 12.0

Answer: 6.5 to 8.0

Environmental Pollution – Multiple Choice Questions with Answers | EBook

64 For normal sludge, the value of sludge index for Indian conditions is
A 0 to 50
B 50 to 150
C 150 to 350
D 350 to 500

Answer: 150 to 350
65 For the same solid content, if the quantity of sludge with moisture content of 98% is X, then the quantity of sludge with moisture content of 96% will be
A X/4
B X/2
C X
D 2X

Answer: X/2
66 A pipe which is installed in the house drainage to preserve the water seal of traps is called
A Vent Pipe
B Antisiphonage Pipe
C Waste Pipe
D Soil Pipe

Answer: Antisiphonage Pipe
67 The pipe which is used to carry the discharge from sanitary fittings like bath rooms, kitchens etc. is called
A Waste Pipe
B Soil Pipe
C Vent Pipe
D Antisiphonage Pipe

Answer: Waste Pipe
68 Most of the bacteria in sewage are
A Parasitic
B Saprophytic
C Pathogenic
D Anaerobic

Answer: Saprophytic
69 The biochemical treatment of sewage effluents is essentially a process of
A Oxidation
B Dehydration
C Reduction
D Alkalinization

Answer: Oxidation
70 Composting and lagooning are the methods of
A Sludge Digestion
B Sludge Disposal
C Sedimentation
D Filtration

Answer: Sludge Disposal
71 In facultative stabilization pond, the sewage is treated by
A Aerobic Bacteria Only
B Algae Only
C Dual Action Of Aerobic Bacteria And Anaerobic Bacteria
D Sedimentation

Answer: Dual Action Of Aerobic Bacteria And Anaerobic Bacteria
72 The maximum efficiency of BOD removal is achieved in
A Oxidation Pond
B Oxidation Ditch
C Aerated Lagoons
D Trickling Filters

Answer: Oxidation Ditch
73 Corrosion in concrete sewers is caused by
A Septic Conditions
B Dissolved Oxygen
C Chlorine
D Nitrogen

Answer: Septic Conditions
74 Sewerage system is designed for
A Maximum Flow Only
B Minimum Flow Only
C Average Flow Only
D Maximum And Minimum Flow

Answer: Maximum And Minimum Flow
75 Facultative bacteria are able to work in
A Presence Of Oxygen Only
B Absence Of Oxygen Only
C Presence As Well As In Absence Of Oxygen
D Presence Of Water

Answer: Presence As Well As In Absence Of Oxygen
76 The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is
A 1
B 100
C infinite
D zero

Answer: 100
77 The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is
A 1 ppm
B 4 ppm
C 10 ppm
D 40 ppm

Answer: 4 ppm
78 The rate of BOD exerted at any time is
A Directly Proportional To BOD Satisfied
B Directly Proportional To BOD Remain-Ing
C Inversely Proportional To BOD Satisfied
D Inversely Proportional To BOD Re-Maining

Answer: Directly Proportional To BOD Remain-Ing
79 If Biochemical oxygen demand (BOD) of a town is 20000 kg/day and BOD per capita per day is 0.05 kg, then population equivalent of town is
A 1000
B 4000
C 100000
D 400000

Answer: 400000
80 The ratio of 5 day BOD to ultimate BOD is about
A 1/3
B 2/3
C 3/4
D 1.0

Answer: 2/3
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