Power Systems
In a nuclear reactor, chain reactor is controlled by introducing

 iron rods.
 brass rods.
 graphite rods.
  cadmium rods.

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Power Systems
Critical mass is

 maximum mass of fissionable material required to sustain a chain reaction.
  minimum mass of fissionable material required to sustain chain reaction.
 a mass of fissionable material required to stop a chain reaction.
 none of these.

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