Maths - Matrices
Maths - Matrices
Maths - Matrices
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Which one of the following statements is not true?
- A scalar matrix is a square matrix
- A diagonal matrix is a square matrix
- A scalar matrix is a diagonal matrix
- A diagonal matrix is a scalar matrix.
Matrix A=[aij ]mX n is a square matrix if,
- m < n
- m > n
- m = 1
- m = n
If

then the values of x and y respectively are
- –2 , 7
- -1/3 , 7
- -1/3 , -2/3
- 2 , -7
If A = ( 1 -2 3 ) and

then, A + B =
- ( 0 0 0 )
-

- ( -14 )
- not defined
If a matrix is of order 2 X 3 then the number of elements in the matrix is
- 5
- 6
- 2
- 3
If

then the value of x is
- 1
- 2
- 1/4
- 4
If A is of order 3 x 4 and B is of order 4 x 3, then the order of BA is
- 3 X 3
- 4 X 4
- 4 X 3
- not defined
If

then the order of A is
- 2 X 1
- 2 X 2
- 1 X 2
- 3 X 2
If A and B are square matrices such that AB = I and BA = I , then B is
- Unit matrix
- Null matrix
- Multiplicative inverse matrix of A
- -A
If

then the values of x and y respectively, are
- 2 , 0
- 0 , 2
- 0 , -2
- 1 , 1
If

and A + B = O, then B is
-

-

-

-

If

then A
2is
-

-

-

-

A is of order m X n and B is of order p X q, addition of A and B is possible only if
- m = p
- n = q
- n = p
- m = p, n = q
If

then the value of a is
- 8
- 4
- 2
- 11
If

is such that A
2= I then
- 1 + α2 + βγ = 0
- 1 - α2 + βγ = 0
- 1 - α2 - βγ = 0
- 1 + α2 - βγ = 0
If A = [aij ]2 X 2 and aij = i + j then, A =
-

-

-

-


then the values of a, b, c and d respectively are
- -1, 0, 0, - 1
- 1, 0, 0, 1
- -1,0,1,0
- 1, 0, 0, 0
If

and

then the matrix B =
-

-

-

-

If

then the value of x is
- 7
- -7
- 1/7
- 0
Which one of the following is true for any two square matrices A and B of same
order?.
- (AB)T= A T B T
- (ATB)T= A TBT
- (AB) T = B A
- (AB)T = BT AT
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