CBSE 2026 · Region 3 · Set 1 · Q10 · 1 mark
If $\displaystyle \mathrm{r}_{1}$ and $\displaystyle \mathrm{r}_{2}$ are the radii of atomic nuclei of mass numbers $\displaystyle 64$ and $\displaystyle 27$ respectively, then the value of $\displaystyle \left(\frac{\mathrm{r}_{1}}{\mathrm{r}_{2}}\right)$ is :
Official answer
From CBSE’s own marking scheme for this paper.
(B)
$\displaystyle \frac{4}{3}$
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CBSE Class 12 Physics past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.