1
KCET 2026
MCQ (Single Correct Answer)
+1
-0
The value of $\lambda$ for which the vectors $\vec{a} = 2\hat{i} + \lambda\hat{j} + \hat{k}$ and $\vec{b} = \hat{i} + 2\hat{j} + 3\hat{k}$ are orthogonal is
A
$\dfrac{5}{2}$
B
$\dfrac{-5}{2}$
C
$\dfrac{2}{5}$
D
$\dfrac{-2}{5}$
2
KCET 2026
MCQ (Single Correct Answer)
+1
-0
If $\vec{a} = \hat{i} + \hat{j} + \hat{k}, \vec{b} = \hat{j} - \hat{k}$ and $\vec{a} \times \vec{c} = \vec{b}, \vec{a} \cdot \vec{c} = 3$, then $\vec{c}$ is
A
$\dfrac{5}{3}\hat{i} - \dfrac{2}{3}\hat{j} + \dfrac{2}{3}\hat{k}$
B
$\dfrac{5}{3}\hat{i} + \dfrac{2}{3}\hat{j} - \dfrac{2}{3}\hat{k}$
C
$\dfrac{5}{3}\hat{i} + \dfrac{2}{3}\hat{j} + \dfrac{2}{3}\hat{k}$
D
$-\dfrac{5}{3}\hat{i} + \dfrac{2}{3}\hat{j} + \dfrac{2}{3}\hat{k}$
3
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
$1$
4
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 $-4$