CBSE 2025 · Region 7 · Set 3 · Q10 · 1 mark
Edge of a variable cube increases at the rate of $\displaystyle 5 \mathrm{~cm} / \mathrm{s}$. The rate at which the surface area of the cube increases when the edge is $\displaystyle 2$ cm long is :
Official answer
From CBSE’s own marking scheme for this paper.
(B)
$\displaystyle 120 \mathrm{~cm}^{2} / \mathrm{s}$
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CBSE Class 12 Mathematics past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.