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GK MCQs Section
Q.   Which of the following can be used as coolant in a nuclear reactor?
  1. Carbon dioxide
  2. Liquid sodium
  3. Helium (He) gas
 Select the correct option from codes given below:
Answer: 1, 2 & 3
Notes: A nuclear reactor coolant is a coolant used to remove heat from the nuclear reactor core and transfer it to electrical generators and the environment. Carbon dioxide, Helium and Liquid Sodium can be used as coolant in a nuclear reactor.
Question Source: 📚This question has been sourced from GKToday's Target UPSC Prelims for 2026, 2027 & 2028 App Exclusive Course in GKToday Android Application which provides more than 12K Topicwise UPSC Prelims General Studies questions with explanations framed on UPSC pattern. Download the app here.
📌 Question Number: 29 in Atomic, Nuclear and Modern Physics in the above course in App.