# Mathematics: Algebra Online Test

In a skew symmetric matrix, the diagonal elements are all ____.
Different from each other
Zero
One
None of the above
If I is a unit matrix, then 3I is ____.
A unit matrix
A triangular matrix
A scalar matrix
None of the above
If  and   then the value of  is ____.
1/3
½
1
2
The value of  if  is ____.
0
1
– 1
None of the above
  this system of equations has ____.
Infinite solution
No solution
Unique solution
None of the above
The cofactor of the element '4' in the determinant  ____.
4
10
– 10
– 4
If one root of  is 4, while the equation  has equal roots, then the value of  is
49/4
4/49
4
¼
If a, b are the two roots of a quadratic equation such that a+b=24 and a-b=8,then the quadratic equation having a and b as its roots is:
x2+2x+8=0
x2-4x+8=0
x2-24x+128=0
2x2+8x+9=0
Description:

Questions are on matrices, determinants,quadratic equation etc

Discussion

It Is Useful Test.It Should Be Written By All 8Th Standard Students.It Is A Nice Test

2504 days 4 hours 46 minutes ago

Kajal Sengupta
Physics 9th to 12 th grade,CIE, Edexcel, AP, IB , CBSE, ICSE 87 Members Recommend
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