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

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

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Power Systems
The factor affecting run off are

 the topography and nature of soil in the catchment area.
  all of above.
 amount of vegetation and weather condition in the catchment area.
 rain fall pattern, shape and size of catchment area.

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