CBSE Class 12 Science Mathematics · Ch 3: Matrices
CBSE Class 12 Science Mathematics · Ch 3: Matrices is an online chapter test in the CBSE Class 12 Science pattern, covering Matrices. Attempt it on SeatBeat with a timer like the real exam, then see a detailed solution for every question and your score and weak-topic analysis.
Topics in this test
| Topic | Questions |
|---|---|
| Matrices | 30 |
Difficulty: 7 medium · 23 hard
Matrices MCQ questions with answers
The first 3 of 30 questions. Unlock the series for the rest, each with a solution.
Q1. If $A$ is a square matrix such that $A^2 = A$, then the value of $(I + A)^3 - 7A$ is:
यदि $A$ एक ऐसा वर्ग आव्यूह है कि $A^2 = A$, तो $(I + A)^3 - 7A$ का मान है:
- A. $I - A$
- B. $I + A$
- C. $A$
- D. $I$
Solution
Expand $(I+A)^3 = I + 3A + 3A^2 + A^3$. Since $A^2 = A$, we get $A^3 = A$, so the sum becomes $I + 3A + 3A + A = I + 7A$; subtracting $7A$ leaves $I$.
$(I+A)^3 = I + 3A + 3A^2 + A^3$ का विस्तार कीजिए। चूँकि $A^2 = A$ है, हमें $A^3 = A$ प्राप्त होता है, अतः योग $I + 3A + 3A + A = I + 7A$ बन जाता है; इसमें से $7A$ घटाने पर $I$ शेष रहता है।
Q2. A $2\times 2$ matrix $A=[a_{ij}]$ is constructed using the rule $a_{ij}=\dfrac{(i+2j)^2}{2}$. The matrix $A$ is:
एक $2\times 2$ आव्यूह $A=[a_{ij}]$ नियम $a_{ij}=\dfrac{(i+2j)^2}{2}$ का उपयोग करके बनाया गया है। आव्यूह $A$ है:
- A. $\begin{bmatrix}\frac{9}{2} & \frac{25}{2}\\ 8 & \frac{81}{2}\end{bmatrix}$
- B. $\begin{bmatrix}\frac{9}{2} & \frac{25}{2}\\ 8 & 18\end{bmatrix}$
- C. $\begin{bmatrix}\frac{9}{2} & \frac{25}{2}\\ \frac{49}{2} & 18\end{bmatrix}$
- D. $\begin{bmatrix}\frac{9}{2} & 8\\ \frac{25}{2} & 18\end{bmatrix}$
Solution
Using the rule, $a_{11}=\tfrac{9}{2},\,a_{12}=\tfrac{25}{2},\,a_{21}=\tfrac{16}{2}=8,\,a_{22}=\tfrac{36}{2}=18$, which gives the shown matrix.
नियम का उपयोग करने पर, $a_{11}=\tfrac{9}{2},\,a_{12}=\tfrac{25}{2},\,a_{21}=\tfrac{16}{2}=8,\,a_{22}=\tfrac{36}{2}=18$, जिससे दर्शाया गया आव्यूह प्राप्त होता है।
Q3. Consider the following statements about invertible matrices: I. If $A$ and $B$ are invertible matrices of the same order, then $(AB)^{-1}=B^{-1}A^{-1}$. II. The inverse of a square matrix, if it exists, is unique. III. Every square matrix is invertible. Which of the statements are correct?
व्युत्क्रमणीय आव्यूहों के विषय में निम्नलिखित कथनों पर विचार कीजिए: I. यदि $A$ और $B$ समान क्रम के व्युत्क्रमणीय आव्यूह हैं, तो $(AB)^{-1}=B^{-1}A^{-1}$। II. किसी वर्ग आव्यूह का व्युत्क्रम, यदि अस्तित्व में है, तो अद्वितीय होता है। III. प्रत्येक वर्ग आव्यूह व्युत्क्रमणीय होता है। कौन-से कथन सही हैं?
- A. I and III only / केवल I और III
- B. I and II only / केवल I और II
- C. I, II and III / I, II और III
- D. II and III only / केवल II और III
Solution
Statements I and II are standard true results, but III is false since a square matrix is invertible only when a matrix $B$ with $AB=BA=I$ exists.
कथन I और II मानक सत्य परिणाम हैं, परन्तु III असत्य है क्योंकि कोई वर्ग आव्यूह केवल तभी व्युत्क्रमणीय होता है जब कोई आव्यूह $B$ ऐसा हो कि $AB=BA=I$।
Frequently asked questions
How many questions are in the CBSE Class 12 Science Mathematics · Ch 3: Matrices?
30 questions for 30 marks, to be answered in 20 minutes.
Is there negative marking in the CBSE Class 12 Science Mathematics · Ch 3: Matrices?
No — wrong answers are not penalised in this test.
Which topics does the CBSE Class 12 Science Mathematics · Ch 3: Matrices cover?
Matrices (30 questions).
Is the CBSE Class 12 Science Mathematics · Ch 3: Matrices free?
It is part of the CBSE Class 12 Science Test Series 2027 — Chapter-wise + Full Tests (36 tests, ₹199). You can first try English · Ch 1: The Last Lesson for free.
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