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The cofactor of the element '4' in the determinant ____.

4

10

– 10

– 4

this system of equations has ____.

Infinite solution

No solution

Unique solution

None of the above

The value of if is ____.

0

1

– 1

None of the above

If and then the value of is ____.

1/3

½

1

2

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

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

If one root of is 4, while the equation has equal roots, then the value of is

49/4

4/49

4

¼

4

10

– 10

– 4

this system of equations has ____.

Infinite solution

No solution

Unique solution

None of the above

The value of if is ____.

0

1

– 1

None of the above

If and then the value of is ____.

1/3

½

1

2

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

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

If one root of is 4, while the equation has equal roots, then the value of is

49/4

4/49

4

¼

Questions are on matrices, determinants,quadratic equation etc

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

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