Multiple choice

In nuclear reactors, graphite is used as a/an ______.

  1. fuel

  2. lubricant

  3. moderator

  4. insulator
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Graphite is used as a moderator in nuclear reactors to slow down fast-moving neutrons. Moderators like graphite or water slow neutrons to thermal energies, making them more likely to cause fission. Graphite is not fuel, lubricant, or insulator in this context.

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