GkSeries.com

NCERT Solutions for class 12 Maths | Chapter 3 - Matrices

Download PDF

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>

Go To Download Page
(1) If A = then find value of α for which A² = B is
[A] 1
[B] -1
[C] 4
[D] None of these
Answer: None of these
(2) If A = then A8 – 28 (A – I)
[A] I – A
[B] A
[C] I + A
[D] A – 2I
Answer: 2I – A

DOWNLOAD CURRENT AFFAIRS PDF FROM APP

(3) If A = then A2 – 5A is equal to
[A] 2I
[B] 3I
[C] -2I
[D] null matrix
Answer: 2I
(4) If A =

B =

then A – B equal to

[A] I
[B] O
[C] 1
[D] 3/2 |
Answer: 3/2 |
(5) If then find the value of x, y, z and w respectively
[A] 2, 2, 3, 4
[B] 2, 3, 1, 2
[C] 3, 3, 0, 1
[D] None of these
Answer: 2, 2, 3, 4
(6) If A = then the value of x is
[A] 3
[B] ±3
[C] ±6
[D] 6
Answer: 3
(7) If A = then A² – 5A – 7I is
[A] zero matrix
[B] a diagonal matrix
[C] identity matrix
[D] None of these
Answer: a diagonal matrix
(8) If A = then |2A| =
[A] 2|A|
[B] 4|A|
[C] 8|A|
[D] None of these
Answer: 4|A|
(9)
[A] α = a² + b², β = ab
[B] α = a² + b², β = 2ab
[C] α = a² + b², β = a² – b²
[D] α = 2ab, β = a² + b²
Answer: α = a² + b², β = 2ab
(10) If then the value of x, y is
[A] 3, 1
[B] 2, 3
[C] 2, 4
[D] 3, 3
Answer: 2, 3
(11) If P is of order 2 x 3 and Q is of order 3 x 2, then PQ is of order
[A] 2 x 3
[B] 2 x 2
[C] 3 x 2
[D] 3 x 3
Answer: 2 x 2
(12) If a matrix has 24 elements then the number of possible order it can have, is
[A] 6
[B] 8
[C] 12
[D] 16
Answer: 8
(13) If A and B are two matrices such that both AB and BA are defined, then
[A] A and B can be any two matrices .
[B] A and B are not square matrices not necessarily of the same order.
[C] A and B are square matrices of the same order .
[D] number of columns of A = number of rows of B .
Answer: A and B are not square matrices not necessarily of the same order.
(14) If A is an orthogonal matrix then AT is a/an
[A] identity matrix
[B] null matrix
[C] orthogonal matrix
[D] scalar matrix
Answer: orthogonal matrix
(15) If A = [3 4 7 -1] [1 6 7 2] [9 8 6 4]

then the order of the matrix is

[A] 4 * 3
[B] 3 * 4
[C] 3 * 3
[D] 4 * 4
Answer: 3 * 4
(16) If 2[3 4] + [1 y] = [7 0] [5 x] [0 1] [10 5] then the value of x - y is
[A] 8
[B] 10
[C] -8
[D] -10
Answer: 10
(17) If A = [ 2 -3 -1 4] then the matrix B such that 2A + 3B = 0 is
[A] [4/3 2 2/3 -8/3]
[B] [-4/3 2 2/3 8/3]
[C] [-4/3 2 2/3 -8/3]
[D] [-4/3 2 -2/3 -8/3]
Answer: [-4/3 2 2/3 -8/3]
(18) If A is a skew symmetric matrix of order 3, then the value of determinant A is
[A] 0
[B] 1
[C] -1
[D] None of these
Answer: 0
(19) If A is a square matrix, then A is symmetric iff
[A] A2 = A
[B] A2 = I
[C] At = A
[D] At = - A
Answer: At = A
(20) If A is any square matrix, then
[A] A + At is symmetric
[B] A - At is symmetric
[C] AAt is scew symmetric
[D] none of these
Answer: A + At is symmetric

Please share this page

Chapters

Click Here to Read more questions

Teacher Eligibility Test