NCERT Solutions for class 12 Maths | Chapter 3 - Matrices

Questions
1 If Matrices = 0, the value of x is
A 3
B 8
C 24
D 0

Answer:8
2 If Matrices
A a unit matrix
B A
C a null matrix
D -A

Answer:a unit matrix
Advertisement
Article and Schedule Quiz Start Test!

DOWNLOAD CURRENT AFFAIRS PDF FROM APP

3 If A = Class 12 Matrices 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

Class 12 Matrices 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

Class 12 Matrices

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 Class 12 Matrices
A -7
B -11
C -2
D 14

Answer:-2
9 If Class 12 Matrices 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 = Class 12 Matrices and |A³| = 25 then α is
A ±3
B ±2
C ±5
D 0

Answer:±3
12 The matrix P = Class 12 Matrices
A square matrix
B diagonal matrix
C unit matrix
D None of these

Answer:square matrix
13 The matrix Class 12 Matrices is a
A diagonal matrix
B symmetric matrix
C skew symmetric matrix
D scalar matrix

Answer:skew symmetric matrix
14 If Class 12 Matrices then the value of w is
A 3
B 4
C 8
D 6

Answer:4
15 If A = Class 12 Matrices then A³ – 7A² + 10A =
A 5I + A
B 5I – A
C 5I
D 6I

Answer:5I – A
16 If A = Class 12 Matrices then A-1 exists if
A λ = 2
B λ ≠ 2
C λ ≠ -2
D none of these

Answer:none of these
17 If Class 12 Matrices then xy equal to
A -5
B -4
C 4
D 5

Answer:-5
18 If Class 12 Matrices then (x, y) is
A (-1, 2)
B (-1, -2)
C (-2, -1)
D (1, -2)

Answer:(-1, 2)
19 The matrix Class 12 Matrices is a
A identity matrix
B symmetric matrix
C skew symmetric matrix
D None of these

Answer:symmetric matrix
20 The matrix A = Class 12 Matrices is a
A unit matrix
B diagonal matrix
C symmetric matrix
D skew symmetric matrix

Answer:symmetric matrix

ADRE 2.0 FULL LENGTH MOCK TEST

Take Mock Tests

Missiles Mock Test Start Test!
SSC MTS Mock Test Start Test
IBPS CLERK MOCK TEST Start Test
SSC MTS 2022 JULY 26 Shift 1 (ENGLISH) Start Test!
SSC GD Previous Year Paper 2021 Nov 17 Shift - I (Hindi) Start Test!
SSC CGL Tier - 1 PYP 2022 April 21 Shift- 1 (ENGLISH) Start Test!
MPSC PAPER I MOCK TEST 1 (ENGLISH) Start Test!
IB Security Assistant Mock test 1 (english) Start Test!
UP POLICE CONSTABLE MOCK TEST 1 Start Test!
DELHI POLICE CONSTABLE MOCK TEST 1 (HINDI) Start Test!

Chapters

Advertisement
Assam Direct Recruitment Test Series