ThePrismSolutions

ThePrismSolutions

DAILY PRACTICE PAPER(26Th June 2018)

(1) If A and B are two square matrices of order 3 such that |A| = -1 , |B| = 3 ,then |3AB| = ?

(a) -9    (b) -81

(c) -3    (d) 81

(2) If A' is the transpose of a square matrix then

(a) |A| ≠ |A'|       (b) |A| = |A'|
(c) |A| + |A'| = 0    (d) none of these

(3) If A and B are matrices, then

(a) AB = BA     (b) AB = 0
(c) AB = I       (d) AB can't be necessarily be defined

Q.) A is a 3 × 4 matrix and B is a matrix such that A'B and AB' both are define .Then B of order

(a) 3 × 3   (b) 4 × 3
(c) 3 × 4    (d) 4 × 4

(5) Let A and B be 3 × 3 matrices.Then AB = 0 implies

(a) A=0 or B=0     (b) A=0 and B=0
(c) A=0 or B=0   (d) either |A|=0 or |B|=0




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