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NCERT Solutions for class 12 Maths | Chapter 3 - Matrices

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Free download in PDF Class 12 Maths Chapter 3 Matrices Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER, IIT-JEE, AIEE and other competitive exams. MCQ Questions for Class 12 Maths with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries. These will help the students for preparation of their examination./p>

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(1) If = 0, the value of x is
[A] 3
[B] 8
[C] 24
[D] 0
Answer: 8
(2) If
[A] a unit matrix
[B] A
[C] a null matrix
[D] -A
Answer: a unit matrix

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(3) If A = then A + AT = I if the value of x is
[A] π/6
[B] π/3
[C] π
[D] 0
Answer: π/3
(4) The matrix is
[A] a symmetric matix
[B] a skew-sybtmetric matrix
[C] a diagonal matrix
[D] None of these
Answer: None of these
(5) If matrix A = [aij]2×2 where aij = then A² is equal to
[A] I
[B] A
[C] O
[D] None of these
Answer: I
(6) The order of the single matrix obtained from

is

[A] 2 × 2
[B] 2 × 3
[C] 3 × 2
[D] 3 × 3
Answer: 3 × 3
(7) Find x, y, z and w respectively such that

[A] 7, 2, 1, 1
[B] 7, 5, 3, 8
[C] 1, 2, 5, 6
[D] 6, 3, 2, 1
Answer: 7, 2, 1, 1
(8)
[A] -7
[B] -11
[C] -2
[D] 14
Answer: -2
(9) If then X=
[A] ±6
[B] 6
[C] -5
[D] 7
Answer: -5
(10) If A = where A² = B then the value of α is
[A] 1
[B] -1
[C] 4
[D] we cant calculate the value of α
Answer: we cant calculate the value of α
(11) If A = and |A³| = 25 then α is
[A] ±3
[B] ±2
[C] ±5
[D] 0
Answer: ±3
(12) The matrix P =
[A] square matrix
[B] diagonal matrix
[C] unit matrix
[D] None of these
Answer: square matrix
(13) The matrix is a
[A] diagonal matrix
[B] symmetric matrix
[C] skew symmetric matrix
[D] scalar matrix
Answer: skew symmetric matrix
(14) If then the value of w is
[A] 3
[B] 4
[C] 8
[D] 6
Answer: 4
(15) If A = then A³ – 7A² + 10A =
[A] 5I + A
[B] 5I – A
[C] 5I
[D] 6I
Answer: 5I – A
(16) If A = then A-1 exists if
[A] λ = 2
[B] λ ≠ 2
[C] λ ≠ -2
[D] none of these
Answer: none of these
(17) If then xy equal to
[A] -5
[B] -4
[C] 4
[D] 5
Answer: -5
(18) If then (x, y) is
[A] (-1, 2)
[B] (-1, -2)
[C] (-2, -1)
[D] (1, -2)
Answer: (-1, 2)
(19) The matrix is a
[A] identity matrix
[B] symmetric matrix
[C] skew symmetric matrix
[D] None of these
Answer: symmetric matrix
(20) The matrix A = is a
[A] unit matrix
[B] diagonal matrix
[C] symmetric matrix
[D] skew symmetric matrix
Answer: symmetric matrix

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