Question # 1

Sum of roots of ax² + bx + c = 0 is equal to product of roots only if:

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a+c=0

b+c=0

a+b=0

a+b+c=0

For what value of k, the roots of the equation x² + √k x + 2 = 0 are equal:

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1

8

2

4

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- cot Θ

- tan Θ

tan Θ

none of these

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diagonal matrix

The range of principal tangent function is:

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In a triangle if α > 45°, ß > 30° then Γ cannot be:

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90°

100°

120°

10°

A geometric series is convergent only if:

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| r | > 1

| r | < 1

| r | = 1

none of these

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T₆

T₇

T₈

T₅

The period of cot x is:

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cos (2sin^-1 x) =

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1- 2x²

1 + 2x²

2x²- 1

x²- 1

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real numbers

complexnumbers

primenumbers

oddnumbers

The multiplicative identity of real numbers is:

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0

1

2

-1

{2, 4, 6, 8, ...........} represents the set of:

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positive odd numbers

natural numbers

prime numbers

positive even numbers

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π is defined as:

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ration of diameter of a circle to its circumference

ration of the circumference of a circle to its diameter

ration of area of a circle to its circumference

ration of the circumference of a circle to its area

If z = x + i y = r (cos Θ + i sin Θ), then arg z is:

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tan Θ

cos²Θ + sin²Θ

r

Θ

Two matrices X and Y are equal if and only if:

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X and Y are of same order

Their corresponding elements are equal

Both a and b

None of these

Conjugate of -3 -2 i is:

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3 + 2i

-3 + 2i

2 + 3i

-2 + 3i

(x + 3) (x + 4) = x2 + 7x + 12 is:

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singular

non-singular

rectangular

null

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diagonal matrix

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