380+ Environmental Engineering Solved MCQs

Environmental engineering is a field of engineering that deals with the application of scientific and engineering principles for the protection of the environment and the health of the general public. Environmental engineers work to identify and assess the environmental impacts of human activities and design solutions to prevent or mitigate those impacts. They may work on a wide range of issues, such as air and water pollution, waste management, and sustainable development. Some common tasks of an environmental engineer include conducting environmental assessments, designing and implementing pollution control systems, and developing strategies for sustainable resource use.

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1.	Which system of collection of sewage is a dry system?
A.	conservancy system
B.	biological digestion
C.	incernation
D.	water carriage system
Answer» A. conservancy system

2.	After how many years, night soil gives good quality manure?
A.	1
B.	5
C.	10
D.	14
Answer» A. 1

3.	Conservancy system is a highly unhygienic system, causing insanitary conditions.
A.	true
B.	false
Answer» A. true

4.	Which of the following is not correct regarding conservancy system?
A.	high maintenance cost
B.	highly unhygienic system
C.	independent of labour
D.	chances of epidemic
Answer» C. independent of labour

6.	is a method where water is used as a medium for the flow of sewage from its production of the treatment unit.
A.	conservancy system
B.	biological digestion
C.	incernation
D.	water carriage system
Answer» D. water carriage system

7.	The water carriage system is a hygienic system without any bad smell.
A.	true
B.	false
Answer» A. true

8.	Which of the following is correct regarding water carriage system?
A.	chances of the epidemic is there
B.	foul smell is produced
C.	does not cause pollution
D.	highly dependent on labours
Answer» C. does not cause pollution

9.	Which of the following is an advantage of a separate water carriage system?
A.	get choked easily
B.	difficult to clean the sewer
C.	two sets of sewer are used
D.	the more uniform character of sewage
Answer» D. the more uniform character of sewage

10.	Which of the following is a disadvantage of a separate water carriage system?
A.	low installation charge
B.	no loads on treatment units
C.	lesser air contact with small sized sewer
D.	provision of the automatic flushing tank is not required
Answer» C. lesser air contact with small sized sewer

11.	provides only one sewer to carry both foul sewage and rainwater.
A.	separate water carriage system
B.	combined water carriage system
C.	partially combined water carriage system
D.	conservancy system
Answer» B. combined water carriage system

12.	Which of the following is an advantage of the combined water carriage system?
A.	there is more air in large sewer
B.	there is the inclusion of storm water
C.	there is difficulties in ventilation of large sewer
D.	overflowing of sewer
Answer» A. there is more air in large sewer

14.	The choice of combined water carriage system does not depend on
A.	space consideration
B.	even rainfall pattern
C.	steep topography
D.	pumping requirements
Answer» C. steep topography

15.	is the flow through sewers available during non-rainfall period.
A.	gradually varied flow
B.	rapidly varied flow
C.	dry weather flow
D.	storm water flow
Answer» C. dry weather flow

18.	Which of the following factor does not effect the dry weather flow?
A.	rate of water supply
B.	temperature conditions
C.	population growth
D.	infiltration of ground water
Answer» B. temperature conditions

19.	The sewer should be designed for a minimum of litres of waste water per capita per day.
A.	50
B.	100
C.	150
D.	1000
Answer» C. 150

13.	Which of the following is incorrect regarding partially combined water carriage system?
A.	the sewers are of reasonable size
B.	there is choking of sewer
C.	the storm water increases load on treatment units
D.	the storm water increases the cost of pumping
Answer» B. there is choking of sewer

16.	is the additional flow occurring during rainy season.
A.	gradually varied flow
B.	rapidly varied flow
C.	dry weather flow
D.	storm water flow
Answer» D. storm water flow

17.	Which flow is also called as sanitary sewage?
A.	dry weather flow
B.	storm weather flow
C.	uniform flow
D.	non uniform flow
Answer» A. dry weather flow

20.	is the process in which ground water unfiltrate into the sewers.
A.	exfiltration
B.	infiltration
C.	filtration
D.	osmosis
Answer» B. infiltration

21.	is the process which indicates the flow of waste water from the sewer into the ground.
A.	exfiltration
B.	infiltration
C.	filtration
D.	osmosis
Answer» A. exfiltration

22.	The peaking factor is defined by
A.	peak flow * average flow
B.	peak flow – average flow
C.	peak flow + average flow
D.	peak flow / average flow
Answer» D. peak flow / average flow

23.	The peaking factor is directly proportional to the population of the city.
A.	true
B.	false
Answer» B. false

24.	The wet weather flow is also known by
A.	minimum sewage flow
B.	maximum sewage flow
C.	storm water flow
D.	average rate of flow
Answer» C. storm water flow

25.	Which of the following surface has a maximum Kuichling’s impermeability factor?
A.	gravel road
B.	water tight roof surface
C.	unpaved surface
D.	macadamized road ways
Answer» B. water tight roof surface

26.	The expression of the Chezy’s formula is given by
A.	v = c/rs
B.	v = crs2
C.	v = c (rs)1/2
D.	v = c/ (rs)1/2
Answer» C. v = c (rs)1/2

380+ Environmental Engineering Solved MCQs

Which system of collection of sewage is a dry system?

After how many years, night soil gives good quality manure?

Conservancy system is a highly unhygienic system, causing insanitary conditions.

Which of the following is not correct regarding conservancy system?

Which system of collection of sewage is called a dry system?

is a method where water is used as a medium for the flow of sewage from its production of the treatment unit.

The water carriage system is a hygienic system without any bad smell.

Which of the following is correct regarding water carriage system?

Which of the following is an advantage of a separate water carriage system?

Which of the following is a disadvantage of a separate water carriage system?

provides only one sewer to carry both foul sewage and rainwater.

Which of the following is an advantage of the combined water carriage system?

Which of the following is incorrect regarding partially combined water carriage system?

The choice of combined water carriage system does not depend on

is the flow through sewers available during non-rainfall period.

is the additional flow occurring during rainy season.

Which flow is also called as sanitary sewage?

Which of the following factor does not effect the dry weather flow?

The sewer should be designed for a minimum of litres of waste water per capita per day.

is the process in which ground water unfiltrate into the sewers.

is the process which indicates the flow of waste water from the sewer into the ground.

The peaking factor is defined by

The peaking factor is directly proportional to the population of the city.

The wet weather flow is also known by

Which of the following surface has a maximum Kuichling’s impermeability factor?

The expression of the Chezy’s formula is given by

Which of the following is the expression of the Manning’s formula?

is the velocity at which the solid matter in sewage remained in suspended form.

Primary treatment of sewage consists of removal of

The most widely used pumps for sewage lifting is

Drop man holes are generally provided in sewers for

The pollution zones in the river are divided into how many types?

In which pollution zone of the river, growth of algae reappear?

In which pollution zone of the river, the dissolved oxygen reduced to 0?

Which is the third zone of pollution in the river?

What is yellow curve represents in the following figure?

Which of the following is represented b the green curve in the above figure?

The maximum deficiency of dissolved oxygen is represented by

Which of the following represents the oxygen sag curve in the following figure?

The reoxygenation constant at temperature ‘T’ is expressed by

The minimum spacing between the bars on fine screen is

The spacing between the bars in racks is

Screens are inclined to the direction of flow to

The maximum spacing between the bars in medium screen is

What is the maximum capacity of medium screen in collecting solids?

The design velocity of flow of a detritus tank is

Which of the following device is used for the removal of oil and grease?

How many types of settling are there in the sedimentation tank?

In which type of settling, sedimentation of discrete particles takes place?

The settling velocity of spherical particle is given by

In which type of settling, settling of particles takes place by the contact of impurities with each other present in wastewater?

In which settling type, dilute suspension of particles takes place?

What is the settling velocity of the particle in the wastewater if its diameter is 2 * 10-3cm. Given G=2.65, viscosity v=8 * 10-3cm2/Sec?

The average time required by water to pass through the settling tank is called

In preliminary treatment of sewage, the operation which takes place, is

How many types of aerators are commonly used in the treatment of wastewater?

The detention period of detritus tank is

How many types of trickling filters are used in sewage treatment?

The depth of the filter media of intermittent filter is

Which of the following filter is used in the anaerobic treatment of sewage?

The maximum size of filter media of a percolating filter is

The recirculation ratio for the low rate trickling filter is

The BOD after the filtration of sewage from the low rate trickling filter is

The efficiency of a percolating filter is given by

The organic loading in low rate trickling filter is 900 kg/hectare- meter/day. What is the efficiency of the filter?

The color of the secondary sludge produced from the high rate trickling filter is

is the ratio of volume of recirculated sewage to the raw sewage.

The size of filter media in a high rate trickling filter is

Which of the following is called as air diffusion method?

The maximum depth of aeration tank used in activated sludge process is

Which type of reactor is used for mixing chemicals in water treatment?

Which reactors are characterized by non- continuous reactions?

SBR is a type of

How is mixing done in SBR?

In which stage of the SBR is aeration performed?

Which of the following is an anaerobic process for treating sewage?

The minimum design depth of oxidation pond is

The detention period of oxidation pond is

The maximum BOD removal efficiency of an oxidation pond is

27.	Which of the following is the expression of the Manning’s formula?
A.	$$$V = R^{1/2}S^{1/2}/N$$$
B.	$$$V = R^{2/3}S^{2}/N$$$
C.	$$$V = R^{2/3}S^{1/2}/N$$$
D.	$$$V = R^{2/3}S^{1/2}$$$
Answer» C. $$$V = R^{2/3}S^{1/2}/N$$$

28.	is the velocity at which the solid matter in sewage remained in suspended form.
A.	settling velocity
B.	self cleansing velocity
C.	mean velocity
D.	non scouring velocity
Answer» B. self cleansing velocity

29.	Primary treatment of sewage consists of removal of
A.	large suspended organic solids
B.	oil and grease
C.	sandand grit
D.	floating materials
Answer» A. large suspended organic solids

30.	The most widely used pumps for sewage lifting is
A.	centrifugal pummp
B.	reciprocating pump
C.	pneumatic ejector
D.	air pressure pump
Answer» A. centrifugal pummp

31.	Drop man holes are generally provided in sewers for
A.	industrial reas
B.	large township
C.	hilly townships
D.	cities in plains
Answer» C. hilly townships

32.	The pollution zones in the river are divided into how many types?
A.	3
B.	4
C.	6
D.	8
Answer» B. 4

33.	In which pollution zone of the river, growth of algae reappear?
A.	zone of degradation
B.	zone of recovery
C.	zone of active decomposition
D.	zone of clean water
Answer» B. zone of recovery

36.	What is yellow curve represents in the following figure?
A.	deoxygenation curve
B.	reoxygenation curve
C.	oxygen sag curve
D.	equilibrium concentration of oxygen
Answer» A. deoxygenation curve

38.	The maximum deficiency of dissolved oxygen is represented by
A.	dotted blue line
B.	green curve
C.	yellow curve
D.	violet curve
Answer» A. dotted blue line

40.	The reoxygenation constant at temperature ‘T’ is expressed by
A.	krt = kr20 (1.016)t
B.	krt = kr20 (1.047) t-20
C.	krt = kr20 (1.016)t-20
D.	krt = kr20 (1.047)t
Answer» C. krt = kr20 (1.016)t-20