Question # 1

If two rows (or two columns) in a square matrix are identical (i.e. corresponding elements are equal), the value of the determinant is:

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0

1

-1

±1

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3×1

1×3

3×3

1×1

If A is a matrix of order m × n, then the number of elements in each row of A is:

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m

n

m + n

m - n

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ab - cd = 0

ac - bd = 0

ad - bc = 1

ad - bc = 0

If A and B are two matrices, then:

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A B = O

AB = BA

AB = I

AB may not be defined

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5

14

20

6

If a matrix A is symmetric as well as skew symmetric, then:

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A is null matrix

A is unit matrix

A is triangular matrix

A is diagonal matrix

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25

20

40

2a + 2b + 2c

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scalar matrix

diagonalmatrix

triangularmatrix

none of these

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singular

non-singular

rectangular

null

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5

-5

-4

4

Minors and co-factors of the elements in a determinant are equal in magnitude but they may differ in:

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order

position

sign

symmetry

If the matrices A & B have the orders 2×3 and 5×2 then order BA is:

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3×5

5×2

2×2

none

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scalarmatrix

diagonalmatrix

lower triangularmatrix

uppertriangularmatrix

If each element in any row or each element in any column of a square matrix is zero, then value of the determinant is:

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0

1

-1

none of these

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diagonal matrix

If A is a square matrix, then:

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|A^t| = A

|A^t| = -A

|A^t| = |A|

A^t= A

[0] is a:

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