Question

Why the flowing water of the river cannot be cleaned easily by natural process?

(a) Because a large number of external substances are discharged into the water

(b) Because external climatic conditions are not favorable to clean the water

(c) The following water is already cleaned before flowing itself

(d) Because of lack of space to clean the water

I have been asked this question during an interview for a job.

I'm obligated to ask this question of Control Measures of Water Pollution in section Environmental Pollution of Energy Management

Answer 1

The correct answer is (a) Because a large number of external substances are discharged into the water

The explanation: The flowing water of the river cannot be cleaned easily by a natural process since a large number of external substances are discharged into the water, the river water becomes polluted. These cause diseases to the people using river water.