1
TS EAMCET 2023 (Online) 12th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

$$ \left|\begin{array}{ccc} \sqrt{3} & 2 \sqrt{5} & \sqrt{5} \\ \sqrt{15} & 5 & \sqrt{10} \\ 3 & \sqrt{15} & 5 \end{array}\right|= $$

A
$5 \sqrt{2}-3 \sqrt{3}$
B
$5 \sqrt{3}-3 \sqrt{5}$
C
$10 \sqrt{3}-15 \sqrt{2}$
D
$15 \sqrt{2}-25 \sqrt{3}$
2
TS EAMCET 2023 (Online) 12th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

If $A$ is a non-singular matrix such that $(A-2 I)$ $(A-3 I)=0$, then $\frac{1}{5} A+\frac{6}{5} A^{-1}=$

A
0
B
I
C
2I
D
3I
3
TS EAMCET 2023 (Online) 12th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

Let $A$ be a matrix such that $A B$ is a scalar matrix, where $B=\left[\begin{array}{ll}1 & 2 \\ 0 & 3\end{array}\right]$ and $\operatorname{det}(3 A)=27$. Then, $3 A^{-1}+A^2=$

A
$\left[\begin{array}{cc}4 & -6 \\ 0 & 2\end{array}\right]$
B
$\left[\begin{array}{cc}9 & -4 \\ 0 & 3\end{array}\right]$
C
$\left[\begin{array}{cc}10 & -6 \\ 0 & 2\end{array}\right]$
D
$\left[\begin{array}{cc}10 & -6 \\ 0 & 4\end{array}\right]$
4
TS EAMCET 2023 (Online) 12th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

If $A$ is a symmetric matrix with real entries, then

A
$A^{-1}$ is symmetric, if it exists
B
$A^{-1}$ always exists and is symmetric
C
$A^{-1}$ is skew-symmetric, if it exists
D
$A^{-1}$ always exists and is skew-symmetric
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