Environmental Engineering Questions and Answers – Pollution Zones in River

This set of Environmental Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Pollution Zones in River”.

1. The pollution zones in the river are divided into how many types?
a) 3
b) 4
c) 6
d) 8
View Answer

Answer: b
Explanation: There are 4 types of pollution zones in the river, namely zone of degradation, zone of active decomposition, zone of recovery and zone of clear water.

2. 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
View Answer

Answer: b
Explanation: The growth of algae reappear in the zone of recovery.The growth of fungi decreases.

3. In which pollution zone of the river, the dissolved oxygen reduced to 0?
a) Zone of degradation
b) Zone of recovery
c) Zone of clean water
d) Zone of active decomposition
View Answer

Answer: d
Explanation: The dissolved oxygen, reduced to 0 in the zone of active decomposition. The water is highly polluted in this zone.
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4. Which is the third zone of pollution in the river?
a) Zone of recovery
b) Zone of degradation
c) Zone of clean water
d) Zone of active decomposition
View Answer

Answer: a
Explanation: The zone of recovery is the third zone of pollution in the river where river tries to recover the polluted water through the self purification process.

5. In which pollution zone of the river, water retains its original dissolved oxygen concentration?
a) Zone of degradation
b) Zone of recovery
c) Zone of active decomposition
d) Zone of clean water
View Answer

Answer: d
Explanation: The water retains its original dissolved oxygen concentration in the zone of clean water. It has a clear appearance.
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6. The fishes were present in the river, but algaes were not able to survive. What is the zone of pollution of the river?
a) Zone of recovery
b) Zone of degradation
c) Zone of clean water
d) Zone of active decomposition
View Answer

Answer: b
Explanation: It is the zone of degradation as dissolved oxygen has reduced to 40%. The fishes will die when dissolved oxygen is less than 4ppm.

7. In which pollution zone of the river, the concentration of D.O reduced to 40%?
a) Zone of degradation
b) Zone of recovery
c) Zone of active decomposition
d) Zone of clean water
View Answer

Answer: c
Explanation: In the zone of active decomposition, the concentration of D.O reduced to 40%. It is the second zone of pollution in the river.
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Sanfoundry Global Education & Learning Series – Environmental Engineering.

To practice all areas of Environmental Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers.

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If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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