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Mathematics · 2026 · 1 mark
CBSE 2026 · Region 2 · Set 1 · Q19
Assertion (A) : The surface area of the cuboid formed by joining two cubes of sides $\displaystyle 4$ cm each, end-to-end, is $\displaystyle 160 \mathrm{~cm}^{2}$.
Reason (R): The surface area of a cuboid of dimensions $\displaystyle l \times \mathrm{b} \times \mathrm{h}$ is $\displaystyle (l \mathrm{~b}+\mathrm{bh}+\mathrm{h} l)$.
Official answer
From CBSE’s own marking scheme for this paper.
(C)
Assertion (A) is true, but Reason (R) is false.
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CBSE Class 10 Mathematics past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.