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Mathematics · 2025 · 1 mark
CBSE 2025 · Region 2 · Set 1 · Q12
Let p and q be two unit vectors and α be the angle between them. Then ( p + q ) will be a unit vector for what value of α?
Let $\displaystyle \vec{p}$ and $\displaystyle \vec{q}$ be two unit vectors and $\displaystyle \alpha$ be the angle between them. Then $\displaystyle (\vec{p}+\vec{q})$ will be a unit vector for what value of $\displaystyle \alpha$ ?
Official answer
(D)
$\displaystyle \frac{2 \pi}{3}$
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CBSE Class 12 Mathematics past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.