Civil Engineering (CE) Exam  >  Civil Engineering (CE) Questions  >  The following zones are formed in a polluted ... Start Learning for Free
The following zones are formed in a polluted river.
(1) zone of clear water
(2) zone of active decomposition
(3) zone of recovery
(4) zone of pollution
The correct sequence in which these zones occur progressively downstream in a polluted river is
  • a)
    4, 2, 1, 3
  • b)
    4, 2, 3, 1
  • c)
    2, 4, 3, 1
  • d)
    2, 4, 1, 3
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
The following zones are formed in a polluted river.(1) zone of clear w...

View all questions of this test
Most Upvoted Answer
The following zones are formed in a polluted river.(1) zone of clear w...
Explanation:

When a river is polluted, different zones are formed progressively downstream. These zones are formed based on the level of pollution and the natural processes that take place in the river. The correct sequence of these zones is as follows:

1. Zone of Pollution:
This is the first zone that is formed downstream in a polluted river. This zone is characterized by high levels of pollutants, such as chemicals, industrial waste, and sewage. The water in this zone is highly contaminated, and it is not suitable for any aquatic life.

2. Zone of Active Decomposition:
As the polluted water flows downstream, it enters the zone of active decomposition. In this zone, the natural decomposition process takes place, and the organic matter in the water is broken down by bacteria and other microorganisms. This process consumes a lot of oxygen, and the oxygen levels in the water decrease rapidly. As a result, the aquatic life in this zone is limited.

3. Zone of Recovery:
As the water flows further downstream, it enters the zone of recovery. In this zone, the oxygen levels in the water gradually increase, and the aquatic life starts to recover. The bacteria and other microorganisms continue to decompose the organic matter, and the water becomes clearer.

4. Zone of Clear Water:
The last zone that is formed downstream in a polluted river is the zone of clear water. In this zone, the water is relatively clean and clear, and the aquatic life is abundant. The natural processes in the river have purified the water, and it is suitable for recreational activities and for supporting aquatic life.

Therefore, the correct sequence in which these zones occur progressively downstream in a polluted river is option B: 4, 2, 3, 1.
Explore Courses for Civil Engineering (CE) exam

Top Courses for Civil Engineering (CE)

The following zones are formed in a polluted river.(1) zone of clear water(2) zone of active decomposition(3) zone of recovery(4) zone of pollutionThe correct sequence in which these zones occur progressively downstream in a polluted river isa)4, 2, 1, 3b)4, 2, 3, 1c)2, 4, 3, 1d)2, 4, 1, 3Correct answer is option 'B'. Can you explain this answer?
Question Description
The following zones are formed in a polluted river.(1) zone of clear water(2) zone of active decomposition(3) zone of recovery(4) zone of pollutionThe correct sequence in which these zones occur progressively downstream in a polluted river isa)4, 2, 1, 3b)4, 2, 3, 1c)2, 4, 3, 1d)2, 4, 1, 3Correct answer is option 'B'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about The following zones are formed in a polluted river.(1) zone of clear water(2) zone of active decomposition(3) zone of recovery(4) zone of pollutionThe correct sequence in which these zones occur progressively downstream in a polluted river isa)4, 2, 1, 3b)4, 2, 3, 1c)2, 4, 3, 1d)2, 4, 1, 3Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The following zones are formed in a polluted river.(1) zone of clear water(2) zone of active decomposition(3) zone of recovery(4) zone of pollutionThe correct sequence in which these zones occur progressively downstream in a polluted river isa)4, 2, 1, 3b)4, 2, 3, 1c)2, 4, 3, 1d)2, 4, 1, 3Correct answer is option 'B'. Can you explain this answer?.
Solutions for The following zones are formed in a polluted river.(1) zone of clear water(2) zone of active decomposition(3) zone of recovery(4) zone of pollutionThe correct sequence in which these zones occur progressively downstream in a polluted river isa)4, 2, 1, 3b)4, 2, 3, 1c)2, 4, 3, 1d)2, 4, 1, 3Correct answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for Civil Engineering (CE). Download more important topics, notes, lectures and mock test series for Civil Engineering (CE) Exam by signing up for free.
Here you can find the meaning of The following zones are formed in a polluted river.(1) zone of clear water(2) zone of active decomposition(3) zone of recovery(4) zone of pollutionThe correct sequence in which these zones occur progressively downstream in a polluted river isa)4, 2, 1, 3b)4, 2, 3, 1c)2, 4, 3, 1d)2, 4, 1, 3Correct answer is option 'B'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of The following zones are formed in a polluted river.(1) zone of clear water(2) zone of active decomposition(3) zone of recovery(4) zone of pollutionThe correct sequence in which these zones occur progressively downstream in a polluted river isa)4, 2, 1, 3b)4, 2, 3, 1c)2, 4, 3, 1d)2, 4, 1, 3Correct answer is option 'B'. Can you explain this answer?, a detailed solution for The following zones are formed in a polluted river.(1) zone of clear water(2) zone of active decomposition(3) zone of recovery(4) zone of pollutionThe correct sequence in which these zones occur progressively downstream in a polluted river isa)4, 2, 1, 3b)4, 2, 3, 1c)2, 4, 3, 1d)2, 4, 1, 3Correct answer is option 'B'. Can you explain this answer? has been provided alongside types of The following zones are formed in a polluted river.(1) zone of clear water(2) zone of active decomposition(3) zone of recovery(4) zone of pollutionThe correct sequence in which these zones occur progressively downstream in a polluted river isa)4, 2, 1, 3b)4, 2, 3, 1c)2, 4, 3, 1d)2, 4, 1, 3Correct answer is option 'B'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice The following zones are formed in a polluted river.(1) zone of clear water(2) zone of active decomposition(3) zone of recovery(4) zone of pollutionThe correct sequence in which these zones occur progressively downstream in a polluted river isa)4, 2, 1, 3b)4, 2, 3, 1c)2, 4, 3, 1d)2, 4, 1, 3Correct answer is option 'B'. Can you explain this answer? tests, examples and also practice Civil Engineering (CE) tests.
Explore Courses for Civil Engineering (CE) exam

Top Courses for Civil Engineering (CE)

Explore Courses
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev