Matrices

Bihar Board Class 12 · Mathematics · 84 past questions

12 of 84 · show all

1. Q1 2026 Set A2026 Set C2026 Set D2026 Set H

   $A=[4\;2\;3]\Rightarrow A'=$

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2. Q2 2026 Set A2026 Set H2026 Set E2026 Set C2026 Set F2026 Set D2026 Set J2026 Set B2021 Set J2021 Set I

   If $A = \begin{bmatrix} 1 & -1 \\ -1 & 1 \end{bmatrix}$, then $A^3 =$

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3. Q3 2026 Set A2026 Set E2026 Set C2026 Set F2026 Set J2026 Set B

   If $A = \begin{bmatrix} 3 & -5 \\ -1 & 2 \end{bmatrix}$ then $\operatorname{adj} A =$

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4. Q4 2026 Set A2026 Set C2026 Set B2026 Set D

   If $A = [\,1\ \ 2\ \ 3\ \ 4\,]$ and $B = \begin{bmatrix} 1 \\ 2 \\ 3 \\ 4 \end{bmatrix}$ then $AB =$

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5. Q5 2026 Set A2026 Set H2026 Set E2026 Set C2026 Set F2026 Set D2026 Set J2026 Set B2024 Set J2024 Set D

   $A = [\,a_{ij}\,]_{m\times n}$ is a square matrix if

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6. Q6 2026 Set A2026 Set H2026 Set E2026 Set C2026 Set F2026 Set D2026 Set J2026 Set B

   $A = \begin{bmatrix} 3 & -4 \\ 1 & -1 \end{bmatrix} \Rightarrow A + A' =$

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7. Q7 2026 Set A2026 Set H2026 Set E2026 Set C2026 Set F2026 Set D2026 Set J2026 Set B2021 Set J2021 Set I

   If $A=\begin{bmatrix}\cos\alpha & \sin\alpha\\ -\sin\alpha & \cos\alpha\end{bmatrix}$ and $A+A'=I$ then…

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8. Q8 2026 Set D

   If $A=\begin{bmatrix}3 & -5\\ -1 & 2\end{bmatrix}$ then $\text{adj}\,A =$

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9. Q9 2026 Set E

   If $A = \begin{bmatrix}1 & 2 & 3 & 4\end{bmatrix}$ and $B = \begin{bmatrix}1\\2\\3\\4\end{bmatrix}$ then…

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10. Q10 2026 Set H

    If $A=\begin{bmatrix}3&-5\\-1&2\end{bmatrix}$ then $adj\,A =$

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11. Q11 2026 Set J2026 Set E2026 Set B2026 Set F

    $A=[\,4\ \ 2\ \ 3\,] \Rightarrow A' =$

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12. Q12 2026 Set J2026 Set F2026 Set H

    If $A=[\,1\;\,2\;\,3\;\,4\,]$ and $B=\begin{bmatrix}1\\2\\3\\4\end{bmatrix}$ then $AB =$

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