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UPSC 2011: The function of heavy water in a nuclear reactor is to
(a)Slow down the speed of neutrons
(b)Increase the speed of neutrons
(c)Cool down the reactor
(d)Stop the nuclear reaction
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Not attemptedCorrect Answer: (a) Slow down the speed of neutrons
Heavy water (D₂O) is used in reactors such as CANDU as a neutron moderator; it slows down fast neutrons, increasing the probability of fission with U-235. It is not meant to speed neutrons, act primarily as a coolant, or stop the reaction. ([en.wikipedia.org](https://en.wikipedia.org/wiki/Heavy_water?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2011 Science & Technology question?▼
The correct answer is option (a): Slow down the speed of neutrons. 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 2011, GS Paper 1, as Question 32. 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.