1 |
Sum of roots of ax2 + bx + c = 0 is equal to product of roots only if: |
a+c=0
b+c=0
a+b=0
a+b+c=0
|
2 |
Four fourth roots of 625 are: |
±5,±5i
±5,±25i
±25,±25i
none of these
|
3 |
|
none of these
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4 |
|
4
16
8
64
|
5 |
|
1
0
2
3
|
6 |
|
i
|
7 |
If one root of 2x2 + ax + 6 = 0 is 2 then the value of a is: |
7
-7
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8 |
|
25
20
40
2a + 2b + 2c
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9 |
If A is a square matrix order 3 × 3 the |kA| equals: |
k |A|
k<sup>2</sup>|A|
k<sup>3</sup> |A|
k<sup>4</sup> |A|
|
10 |
If each element of a 3 × 3 matrix A is multiplied by 3, then the determinant of the resulting matrix is: |
|A|<sup>3</sup>
27|A|
3|A|
9|A|
|
11 |
For a square matrix A, |A| equals: |
A<sup>t</sup>
|A<sup>t</sup>|
-|A<sup>t</sup>|
-A<sup>t</sup>
|
12 |
If A = [aij], B = [bij] and AB = 0 then: |
A = 0
B = 0
either A = 0 or B = 0
A & B not necessarily zero
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13 |
If A = [aij] and B = [bij] are two matrices of same order r × s, then order of A - B is: |
r - s
r × s
r + s
none of these
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14 |
S = {1, -1, 2, -2} is a group under: |
multiplication
subtraction
addition
none of these
|
15 |
|
equal sets
null sets
overlapping sets
subsets
|
16 |
|
A
B
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17 |
If sets A and B are equal then: |
|
18 |
If W = {0, 1, 2, 3, 4, ........}, N = {1, 2, 3, 4 ...........} then N - W = ? |
W
{0}
none of these
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19 |
|
|
20 |
|
{1, 2, 3}
{5, 6, 7}
{4}
|