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Free download in PDF Environmental Engineering Multiple Choice Questions with Answers for competitive exams. These short objective type questions with answers are very important for competitive exams as well as Board exams. These short solved questions or quizzes are provided by Gkseries.
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
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
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
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
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
68
Most of the bacteria in sewage are
[A]
Parasitic
[B]
Saprophytic
[C]
Pathogenic
[D]
Anaerobic
69
The biochemical treatment of sewage effluents is essentially a process of
[A]
Oxidation
[B]
Dehydration
[C]
Reduction
[D]
Alkalinization
70
Composting and lagooning are the methods of
[A]
Sludge Digestion
[B]
Sludge Disposal
[C]
Sedimentation
[D]
Filtration
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
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
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
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
80
The ratio of 5 day BOD to ultimate BOD is about
[A]
1/3
[B]
2/3
[C]
3/4
[D]
1.0
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