AIIMS 2019 Physics Nuclear Fission Assertion Reason Question
In U₂₃₅ fission reaction neutrons are required to be slowed down because the probability of capture of slow moving neutrons is high for U₂₃₅.
Both assertion and reason are true and reason is the correct explanation of assertion.
Both assertion and reason are true but reason is not the correct explanation of assertion.
Assertion is true but reason is false.
Both assertion and reason are false.
Correct Answer
Detailed Explanation
Option B is correct because both the assertion and reason are true: U-235 fission reactions indeed require slow (thermal) neutrons for a higher probability of fission, as these neutrons are more easily captured by U-235 nuclei. However, the reason provided does not explain the assertion adequately; while it states that slow neutrons have a high capture probability, it does not clarify that this is essential for sustaining a chain reaction in nuclear reactors.
Option A is incorrect because, although both statements are true, the reason does not correctly explain the assertion. Option C is wrong because both the assertion and reason are true. Option D is incorrect as both statements are factual and relevant to nuclear fission processes.
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