UPSC Prelims 1995·GS1·science-and-technology·nuclear technology

The difference between a nuclear reactor and an atomic bomb is that

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Last updated 23 May 2026, 3:31 pm IST
  1. Ano chain reaction takes place in nuclear reactor while in the atomic bomb there is a chain reaction
  2. Bthe chain reaction in nuclear reactor is controlledCorrect
  3. Cthe chain reaction in nuclear reactor is not controlled
  4. Dno chain reaction takes place in atomic bomb while it takes place in nuclear reactor

Explanation

The correct answer is B because of the nature of the chain reaction in both systems. In a nuclear reactor, the chain reaction is controlled using control rods and moderators. These ensure that for every fission event, only one subsequent neutron goes on to cause another fission, maintaining a steady and safe release of energy for power generation. In an atomic bomb, the chain reaction is uncontrolled. It is designed to be a runaway process where the number of fission events increases exponentially in a fraction of a second, leading to a massive and violent explosion. Therefore, the fundamental difference lies in the control mechanism of the chain reaction.
science-and-technology: The difference between a nuclear reactor and an atomic bomb is that

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