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Mathematics ECAT Pre Engineering Chapter 5 Matrices and Determinants Online Test MCQs With Answers
Question # 1
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2 x 2
2 x 3
3 x 2
3 x 3
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Question # 2
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An upper triangular matrix
A lower triangular matrix
A diagonal matrix
A null matrix
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Question # 3
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Question # 4
If the matrices A and B are conformable for multiplication then (AB)
t
= ______
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AB
A
t
B
t
B
t
A
t
A
t
B
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Question # 5
Matrix multiplication is
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Commutative
Not commutative
Not associative
Not distributive
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Question # 6
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0
abc
1/abc
None of these
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Question # 7
If A and B are two matrices such that AB = B and BA = A then A2 + B2 =
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2 AB
2 BA
A + B
AB
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Question # 8
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Question # 9
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Question # 10
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 # 11
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Symmetric
Skew-symmetric
Hermitian
Skew hermitian
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Question # 12
The order of the matrix A is 3 x 5 and that of B is 2 x 3.The order of the matrix BA is
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2 x 3
3 x 2
2 x 5
5 x 2
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Question # 13
Matrices A = [aij] 2 x 3 and B =[bij] 3 x 2 are suitable for
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BA
A
2
AB
B
2
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Question # 14
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Question # 15
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3 x 1
1 x 3
3 x 3
1 x 1
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Question # 16
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 # 17
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Scalar matrix
Identity matrix
Null matrix
Symmetric matrix
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Question # 18
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0
1
-2
10
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Question # 19
If there are m rows and n columns in a matrix then its order is
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m x n
m x m
n x n
n x m
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Question # 20
Every identity matrix is
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Row-vector
Scalar
Column-vector
All
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Question # 21
The number of non zero rows in echelon form of a matrix is called
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Order of matrix
Rank of matrix
Row operation
None of these
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