Question # 1

S = {1, -1, 2, -2} is a group under:

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multiplication

subtraction

addition

none of these

A statement which is true for all possible values of the variables involved in it, is called a:

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tautology

conditional

implication

absurdity

If the Discriminant of a quadratic equation is a perfect square, then roots are:

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real and equal

complex

rational

irrational

A^-1 exists if A is:

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singular

nonsingular

symmetric

none

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0

i

-i

1

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3×1

1×3

3×3

1×1

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If P(x) is a polynomial of degree m and Q(x) is a polynomial of degree n, the product P(x) . Q(x) will be a polynomial of degree:

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m . n

m - n

m + n

m × n

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A and B are power sets

A and B are disjoint sets

A and B are super sets

A and B are equal sets

Solution set of the equation x² - 3x + 2 = 0 is

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{-1, 2}

{1, -2}

{-1, -2}

{1, 2}

cos^-1 (-x) =

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π + cos^-1 x

π - cos^-1x

π + sin^-1x

π - sin^-1x

The multiplicative identity of real numbers is:

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0

1

2

-1

Number of ways of arranging 5 keys in a circular ring is:

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12

24

6

5

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3

1

4

None

The middle term in the expansion of (1+x)^1/2 is:

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T₂

T₃

does not exist

none of these

If sin α = cos ß in any triangle ABC then:

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α + ß = 90°

α + ß = 180°

α + ß = 360°

α + ß

What is the general term of the sequence 2, 4, 6, 8, ........... ?

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2n

n + 1

2n²

none of these

The next term of the sequence-1, 2, 12, 40, .........is:

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112

212

144

none

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- cot Θ

- tan Θ

tan Θ

none of these

A matrix of order m×1 is called:

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row matrix

column matrix

identity matrix

scalar matrix

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