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Physics · 2025 · 1 mark
CBSE 2025 · Region 6 · Set 1 · Q16
Assertion (A): The binding energy per nucleon is practically constant for mass number in the range ( 30< A <170 ). Reason (R): Nuclear forces between…
Assertion (A) : The binding energy per nucleon is practically constant for mass number in the range ( $\displaystyle 30<\mathrm{A}<170$ ).
Reason (R) : Nuclear forces between the nucleons for mass numbers in the range ( $\displaystyle 30<\mathrm{A}<170$ ) are not short-range.
Official answer
(C)
Assertion (A) is true, but Reason (R) is false.
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CBSE Class 12 Physics past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.