CUET Mathematics - Let a = i + j + k and b = i + 2j + 3k then a unit vector perpendicular to both vectors (a + b) and (a - b) is equal to | PYQs + Solutions

CUET Mathematics 2025 22 May Shift 1

Algebra

Medium

core

$\frac{1}{\sqrt{6}}(-\hat{i} + 2\hat{j} - \hat{k})$

$\frac{1}{\sqrt{6}}(\hat{i} - 2\hat{j} - \hat{k})$

$\frac{1}{\sqrt{3}}(\hat{i} + \hat{j} + \hat{k})$

$\frac{1}{\sqrt{6}}(\hat{i} + 2\hat{j} + \hat{k})$

✅ Correct Option: 1

Related questions:

16 May Shift 1

Match List-I with List-II

List-I	List-II
(A) Angle between î and -ĵ is	(I) $\frac{\pi}{6}$
(B) Angle between 2î + k̂ and 10î + 5k̂ is	(II) $\frac{\pi}{4}$
(C) Angle between î and î + ĵ is	(III) 2π
(D) Angle between √3ĵ - k̂ and ĵ is	(IV) $\frac{\pi}{2}$

Choose the correct answer from the options given below:

27 May Shift 1

Which of the following statements are true?

(A) The vector joining the points P(2, 3, 0) and Q(-1,-2,-4) directed from P to Q is $\vec{PQ} = -3\hat{i} - 5\hat{j} - 4\hat{k}$

(B) Projection of a vector $\vec{a}$ on other vector $\vec{b}$ is $\frac{\vec{a}.\vec{b}}{|\vec{a}|}$

(C) If $\vec{a} = \hat{i} - 2\hat{j} + \hat{k}$ and $\vec{b} = -2\hat{i} + 4\hat{j} + 5\hat{k}$ then $\vec{a} + \vec{b} = -\hat{i} + 2\hat{j} + 6\hat{k}$

(D) If $\theta$ is the angle between $\vec{a}$ and $\vec{b}$ then $\cos \theta = \frac{\vec{a}.\vec{b}}{|\vec{a}||\vec{b}|}$

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22 May Shift 2

For any vector $\vec{a}$ , the value of $|\vec{a} \times \hat{i}|^2 + |\vec{a} \times \hat{j}|^2 + |\vec{a} \times \hat{k}|^2$ is equal to:

CUET Mathematics 2025 22 May Shift 1 PYQs

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