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ECAT Pre General Science Mathematics Chapter 5 Matrics and Determinants Online Test MCQs With Answers
Question # 1
If A is any matrix then its additive inverse is
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A
A
-1
A
t
-A
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Question # 2
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2
4
6
8
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Question # 3
If A is a non-singular matrix then adj A is
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Non-singular
Symmetric
Singular
Non defined
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Question # 4
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4A - 3I
3A - 4I
A - I
None of these
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Question # 5
A square matrix A = [aij] is lower triangular matrix when
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aij = 0 for all i<j
bij = 0
cij = 0
dij = 0
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Question # 6
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a = 2, b = 3
a = 3, b = 2
a = 2, b = 1, 2
a = 3, b = 3
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Question # 7
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0
1
-2
10
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Question # 8
A and B be two square matrices and if their inverse exist, the (AB)
-1
=
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A
-1
B
-1
AB
-1
A
-1
B
B
-1
A
-1
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Question # 9
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Question # 10
A square matrix A for which A
t
= -A is called a
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Column matrix
Symmetric matrix
Skew-symmetric matrix
Row matrix
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Question # 11
If A and B are skew-symmetric then (AB)t is
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At Bt
AB
-AB
BA
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Question # 12
If for the matrix A,A5 = 1,then A-1=
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A2
A3
A
None of above
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Question # 13
If A is skew Hermitian Matrix then which of the following is not skew Hermitian matrix
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A2
A5
A3
A7
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Question # 14
An equation of the form ax + by = k is homogeneous linear equation when:
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Question # 15
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k3
0
3k
k6
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Question # 16
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all are correct
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Question # 17
A = [3] is a/an
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Square matrix
Scalar matrix
Diagonal matrix
Identity matrix
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Question # 18
Let A is a 3 x 3 matrix and B is its adjoint matrix. If |B| = 64, then |A| =
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Question # 19
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0
1
2
4
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Question # 20
(ABC)' =
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CBA'
CBA
C'B'A
C'B'A'
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Question # 21
Rank of matrix [1 3 5 0] is
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1
3
2
4
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