Paper 1 · Teaching Aptitude
UGC NET December 2023 (11.12.2023) Shift-II
Which of the following elements is fissile?
AThorium-232
BPlutonium-239 ✓ Correct
CUranium-237
DUranium-238
Correct answer: (B) Plutonium-239 — Plutonium-239 is fissile, so the answer is plutonium-239.
Explanation
★Plutonium-239 is fissile, so the answer is plutonium-239.
★A fissile material can sustain a nuclear fission chain reaction with slow neutrons.
★Plutonium-239 readily undergoes fission and sustains a chain reaction.
★It is used as fuel in reactors and in nuclear weapons.
★Thorium-232 and uranium-238 are fertile, not directly fissile.
★So among these, plutonium-239 is the fissile element.
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