1
KCET 2026
MCQ (Single Correct Answer)
+1
-0
If $\vec{a} = 2\hat{i} + 2\hat{j} - \hat{k}, \vec{b} = \alpha\hat{i} + \beta\hat{j} + 2\hat{k}$ and $|\vec{a} + \vec{b}| = |\vec{a} - \vec{b}|$, then $\alpha + \beta$ is equal to
A
$2$
B
$-1$
C
$0$
D
$1$
2
KCET 2026
MCQ (Single Correct Answer)
+1
-0
The three points $A(2, 4, 3), B(4, a, 9)$ and $C(10, -1, 7)$ form a right-angled triangle with $\angle B = 90^\circ$, then the value of "a" is
A
$1$ or $4$
B
$-1$ or $4$
C
$1$ or $-4$
D
$-1$ or $-4$
3
KCET 2026
MCQ (Single Correct Answer)
+1
-0
The measure of the angle between the lines $x = k + 1, y = 2k - 1, z = 2k + 3, k \in \mathbb{R}$ and $\dfrac{x - 1}{2} = \dfrac{y - 2}{1} = \dfrac{z - 3}{1}$ is
A
$\cos^{-1}\left(\dfrac{2}{3}\right)$
B
$\cos^{-1}\left(\sqrt{\dfrac{2}{3}}\right)$
C
$\cos^{-1}\left(\sqrt{\dfrac{3}{2}}\right)$
D
$\cos^{-1}\left(\dfrac{3}{2}\right)$
4
KCET 2026
MCQ (Single Correct Answer)
+1
-0
The angle between the lines whose direction ratios are $a, b, c$ and $b - c, c - a, a - b$ is
A
$90^\circ$
B
$60^\circ$
C
$30^\circ$
D
$0^\circ$