Important Questions of Matrices Mathematics | Zigya

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21.

What is the order of xyzahghbfgfcxyz = ?

  • 3 × 1

  • 1 × 1

  • 1 × 3

  • 3 × 3


22.

If A = 0110, then the value of A4 is

  • 1001

  • 1100

  • 0011

  • 0110


23.

A = x + yyxx - y, B = 3 - 2 and C = 4 - 2.If AB = C,then what is A2 = ?

  • 48 - 4 - 16

  • 4 - 48 - 16

  •  - 4 - 8412

  •  - 4 - 8812


24.

The matrix A has x rows and x + 5 columns. The matrix B has y rows and 11 - y columns. Both AB and BA exist. What are the values of x and y respectively ?

  • 8 and 3

  • 3 and 4

  • 3 and 8

  • 8 and 8


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25.

If A = 4i - 610i14i6 + 4i and k = 12i, where i =  - 1, then kA = ?

  • 2 + 3i576 + 4i

  • 2 - 3i572 + 3i

  • 2 - 3i752 + 3i

  • 2 + 3i572 +3i


26.

A is a square matrix, then the value of adj AT - adj(A)T is equal to

  • A

  • A I, where the identity matrix

  • Null matrix whose order is same as that of A

  • unit matrix whose order is same as that of A


27.

If a, b, c are non-zero real numbers, then the inverse of the matrix A = a000b000c =?

  • a - 1000b - 1000c - 1

  • 1abca - 1000b - 1000c - 1

  • 1abc100010001

  • 1abca000b000c


28.

If A =  - 222 - 2, then which one of the following is correct ?

  • A2 = - 2A

  • A2 = - 4A

  • A2 = - 3A

  • A2 = 4A


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29.

If A is a square matrix, then what is adj(A - 1) - (adj A) - 1 equal to ?

  • 2A

  • Null matrix

  • Unit Matrix

  • None of the above


30.

Consider the following in respect of the matrix

A =  - 111 - 11. A2 = - A2. A3 = 4A

Which of the above is/are correct ?

  • 1 only

  • 2 only

  • bth 1 and 2

  • neither 1 nor 2


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