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Nuclei — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsNuclei1 Mark
MCQ
During a nuclear fission reaction:
  • A
    A heavy nucleus breaks into two fragments by itself a light nucleus bombarded by thermal neutrons breaks up.
  • B
    A light nucleus bombarded by thermal neutrons breaks up.
  • ✓
    A heavy nucleus bombarded by thermal neutrons breaks up.
  • D
    Two light nuclei combine to give a heavier nucleus and possible other products.
✓

Answer

Correct option: C.
A heavy nucleus bombarded by thermal neutrons breaks up.
In a nuclear reactor, a large fissile atomic nucleus like uranium$-235$ absorbs a thermal neutron and undergoes a nuclear fission reaction. The heavy nucleus splits into two or more lighter nuclei releasing gamma radiation and free neutrons.

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