Which of the following statements is not true?
AUranium (U-235) is the most widely used fuel for nuclear fission because its atoms are easily split
BThe nuclear fuel used in the fast breeder reactor is thorium
CThorium is much more abundant in nature than uranium
DThorium is not safer and more efficient to mine than uranium ✓ Correct
Correct answer: (D) Thorium is not safer and more efficient to mine than uranium
Explanation
The claim that thorium is not safer and more efficient to mine than uranium is itself untrue, since thorium is in fact safer and easier to handle, so this is the false statement.
It is true that uranium-235 is the most widely used fission fuel because its nuclei split readily.
It is true that thorium is used within the breeding cycle associated with fast breeder reactors.
It is true that thorium is far more abundant in nature than uranium.
Thorium mining produces less long-lived radioactive waste and carries lower proliferation risk.
India's abundant thorium is central to its long-term nuclear energy strategy.
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