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      Question

      Which material is used as a moderator in a nuclear power

      plant that slows down the neutrons and makes them fit for causing fission?
      A Boron Correct Answer Incorrect Answer
      B Beryllium Correct Answer Incorrect Answer
      C Silicon Correct Answer Incorrect Answer
      D Graphite Correct Answer Incorrect Answer

      Solution

      In a nuclear power plant, materials such as graphite  or heavy water (deuterium oxide, D₂O) are used as moderators. These materials slow down the neutrons, making them more likely to cause fission when they interact with nuclear fuel.

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