WBCS.LIVE practice question

Which element is used as a moderator in a Nuclear Reactor?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. Uranium
  2. Graphite
  3. Plutonium
  4. Thorium

Correct answer and explanation

Correct answer: Graphite

Explanation: āœ… Correct Answer: (B) Graphite šŸ“š Explanation: In a nuclear reactor, a moderator is used to slow down the fast-moving neutrons produced during nuclear fission. Slowing them down increases the probability of further fission reactions, maintaining a controlled chain reaction. Graphite and Heavy Water (D2O) are commonly used as moderators. Uranium and Plutonium serve as the nuclear fuel, while Thorium is a fertile material that can be converted into fuel.