What is the role of ultraviolet (UV) radiation in the water purification systems? 1. It inactivates/kills the harmful microorganisms in water. 2. It removes all the undesirable odours from water. 3. It quickens the sedimentation of solid particles, remove

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Q: 38 (IAS/2012)
What is the role of ultraviolet (UV) radiation in the water purification systems?
1. It inactivates/kills the harmful microorganisms in water.
2. It removes all the undesirable odours from water.
3. It quickens the sedimentation of solid particles, removes turbidity and improves the clarity of water.
Which of the statements given above is/are correct?

question_subject: 

Science

question_exam: 

IAS

stats: 

0,58,54,58,3,26,25

keywords: 

{'ultraviolet': [0, 0, 0, 1], 'uv': [1, 0, 1, 3], 'water purification systems': [0, 0, 0, 2], 'radiation': [0, 0, 1, 0], 'harmful microorganisms': [0, 0, 0, 1], 'water': [65, 15, 80, 129]}

The correct answer is 1 only.

Ultraviolet (UV) radiation is used as a disinfection method in water purification systems. It works by inactivating or killing harmful microorganisms such as viruses, bacteria, and parasites present in the water. The radiation damages the DNA or RNA of these microorganisms, rendering them unable to reproduce and infect humans. Therefore, statement 1 is correct.

Statements 2 and 3 are incorrect. UV radiation does not remove odors from water. Additionally, it does not affect the sedimentation or turbidity of the water. These processes are usually achieved through other methods such as settling or filtration.