Consider the following:

  1. Liquid sodium
  2. Helium (He) gas
  3. Water (H20)
  4. Heavy water (D20)

Which of the above can be used as a coolant in a nuclear reactor?

Answer: [D] 1, 2, 3 & 4

All of the above can be used as coolant in nuclear reactor. Recently, Unit 1 of the Kakrapar Atomic Power Station was shut down after the leakage of heavy water that is used in cooling off the nuclear reactor core. 

This question is a part of GKToday's Integrated IAS General Studies Module