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UPSC 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 the 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?
(a)1 only
(b)2 and 3 only
(c)1 and 3 only
(d)1, 2 and 3
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Not attemptedCorrect Answer: (a) 1 only
In UV water purifiers the radiation damages microbial DNA, inactivating pathogens (statement 1). UV does not strip odours, nor does it aid coagulation/sedimentation; these require separate treatments. Hence only statement 1 is correct. ([superkalam.com](https://superkalam.com/upsc-prelims/previous-year-question-paper/2012/what-is-the-role-of-ultraviolet-uv-radiation-in-the-water-purification-systems-it-inactivates-kills-the-harmful-microorg-6b399438-113e-4c1c-a63a-b6d2f751bd51?utm_source=openai))
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What is the correct answer to this UPSC 2012 Science & Technology question?▼
The correct answer is option (a): 1 only. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Energy & Environment question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2012, GS Paper 1, as Question 13. It falls under Science & Technology > Energy & Environment.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
How many UPSC Prelims questions have been asked from Energy & Environment?▼
UPSC has asked 48 questions from Energy & Environment (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.