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

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

(a) 3

(b) 4

(c) 6

(d) 8

I have been asked this question in an interview.

This key question is from Pollution Zones in River in division Natural Methods of Wastewater Disposal of Environmental Engineering

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Correct answer is (b) 4

The 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.

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