# Tamilnadu +2 maths important one mark question

Application of matrices and determinants - Set 3
15. Equivalent matrices have rank ………….
(1)    Same                                 (2)    different
(3)     May or may not be same    (4)    zero
16. By determinant method the value of  x for the equations
x-y = 2; 3y = 3x-7 is
(1)0              (2) 1         (3)    5              (4)    8
17.  The solution of 7x+5y-13z+4 = 0, 9x+2y+11z = 37, 3x-y+z = 2 is
(1) x=1,y=3,z=2  (2) x=2,y=1,z=3  (3) x=3,y=2,z=1  (4) none of these
18.  If A is a square matrix of order n, then A(adj A)
(1) [aij]T     (2)AI          (3) IAI In           (4) IAI
19.  The rank  of a non-singular matrix of order n×n is
(1)  n                (2)  n2               (3)  0                        (4)    1
20. If the value  of  x is given , then the value of  x is
(1) ∆x/∆             (2) ∆/∆x     (3) ∆x = 0           (4) ∆×∆x
21. The value of z, from the given equations:
2x+y+z = 5; x+y+z = 4; x-y+2z = 1 is
(1) 2                 (2) 6                 (3) 3                 (4) 1