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Free download in PDF Environmental Engineering Short Questions & 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.
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
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
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
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
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
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
48
Sewage treatment units are normally designed for
[A]
5-10 years
[B]
15-20 years
[C]
30-40 years
[D]
40-50 years
49
Standard BOD is measured at
[A]
20°C - 1day
[B]
25°C- 3day
[C]
20°C - 5day
[D]
30°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
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
53
Dissolved oxygen in streams is
[A]
Maximum At Noon
[B]
Minimum At Noon
[C]
Maximum At Midnight
[D]
Same Throughout The Day
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
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
58
Generally the detention period for grit chambers is kept as
[A]
1 minute
[B]
5 minutes
[C]
2-4 hours
[D]
12 hours
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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