CBSE 2026 · Region 4 · Set 1 · Q6 · 1 mark
The surface area of a sphere when its volume changes at the same rate as its radius is :
Official answer
From CBSE’s own marking scheme for this paper.
(B)
$\displaystyle 1$ sq. unit
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CBSE Class 12 Mathematics past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.