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Math 11 Chapter 3
Matrices and Determinants
Test 1
1.
If a matrix has 4 rows and 5 columns then the number of elements in that matrix is 9.
a) True
b) False
2.
A square matrix A= [a
ij
] is called diagonal matrix if a
ij
=0 for i = j.
a) False
b) True
3.
Identity matrix is not a diagonal matrix.
a) True
b) False
4.
is an identity matrix.
a) True
b) False
5.
If A= [a
ij
]
2x3
andB= [b
ij
]
3x4
thenorder of (AB) is 2x4
a) False
b) True
6.
The cofactor of a
22
in
is
a) True
b) False
7.
If all the entries in a matrix are multiplied by scalar k than whole matrix is multiplied by 3k.
a) False
b) True
8.
In (AB)
-1
= A
-1
B
-1
when A&B are matrices.
a) False
b) True
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