If I is a unit matrix, then 3I is ____.
A unit matrix
A triangular matrix
A scalar matrix
None of the above
In a skew symmetric matrix, the diagonal elements are all ____.
Different from each other
Zero
One
None of the above
Given 2x –y +2z =2, x –2y +z =-4, x+ y +(z =4 then the value of ( such that the given system of equation has NO solution, is
3
1
0
-3
The parameter, on which the value of the determinant
does not depend upon is
a
p
d
x
Consider the set A of all determinants of order 3 with entries 0 or 1 only. Let B be the subset of A consisting of all determinants with value 1. Let C be the subset of A consisting of all determinants with value –1. Then
C is empty
B has as many elements as C
A = B ( C
B has twice as many elements as elements as C
Normal type of MCQ with one correct option
A square matrix A is called idempotent if
A2 = I
A2 = O
2A = I
A2 = A
/
A,B
B
C,D
A,B & D
/
A
B
C
A+B+C
Both A and R are true and R is correct explanation of A
Both A and R are true and R is not correct explanation of A
A is true, R is false
A is false, R is true