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ECAT Pre General Science Mathematics Chapter 5 Matrics and Determinants Online Test MCQs With Answers
Question # 1
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3 x 2
2 x 3
3 x 3
2 x 2
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Question # 2
In order of A is m x n and order of B is n x p then order of AB is
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m x m
n x n
m x p
p x m
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Question # 3
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 # 4
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Question # 5
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A
-A
A
t
A
-
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Question # 6
A matrix in which the number of rows is not equal to the number of columns is called a
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Diagonal matrix
Rectangular matrix
Square matrix
Scalar matrix
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Question # 7
The transport of a rectangular matrix is a
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Square matrix
Rectangular matrix
Row matrix
Column matrix
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Question # 8
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 # 9
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Null matrix
Triangular matrix
Unit matrix
Rectangular matrix
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Question # 10
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a = -1/2, b = -1
a = 1, b = 2
a = 2, b = 3
None of above
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Question # 11
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6, -12, -18
-6, 4, 9
-6, -4, -9
-6, 12, 18
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Question # 12
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0
1
2
4
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Question # 13
If A is singular then |A| = ______
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1
0
2
None of these
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Question # 14
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16
256
64
1024
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Question # 15
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all are correct
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Question # 16
If A is a skew-symmetric matrix of order n and P, any square matrix of order n.prove that P' AP is
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Skew-symmetric
Symmetric
Null
Diagonal
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Question # 17
For any positive integer n
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ABn = Bn A ⇔ AB = BA
ABn = Bn A⇔ A,B are square matrices and AB = BA
ABn = BnA⇔ A + B
ABn = BnA ⇔ A and B are square matries
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Question # 18
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Question # 19
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An upper triangular matrix
A lower triangular matrix
A diagonal matrix
A null matrix
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Question # 20
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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Question # 21
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2s
2
2s
3
s
3
3s
3
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