Question # 1

Sum of all three cube roots of unity is:

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1

-1

0

3

If the roots of x² - bx + c = 0 are two consecutive integers, then: b² - 4ac =

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0

1

-1

2

The graph of y = cos^-1 x is obtained by reflecting the graph of y = cos x about:

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x-axis

y-axis

y = x

y = -x

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5

14

20

6

1° is equal to:

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rationalnumber

irrationalnumber

naturalnumber

wholenumber

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

-2 sin α sin ß =

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sin (α + ß) + sin (α - ß)

cos (α + ß) + cos (α - ß)

cos (α + ß) - cos (α - ß)

cos (α - ß) + cos (α - ß)

A circle drawn inside a triangle and touching its sides is known as:

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diagonal matrix

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equal sets

null sets

overlapping sets

subsets

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The period of cot 2x is:

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If A = [aij] and B = [bij] are two matrices of same order r × s, then order of A - B is:

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r - s

r × s

r + s

none of these

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3×1

1×3

3×3

1×1

If a polynomial P(x) = x2 + 4x2 - 2x + 5 is divided by x - 1, then the reminder is:

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8

-2

4

5

tan (270° + Θ) is equal:

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cot Θ

tan Θ

-cot Θ

-tan Θ

The objects in a set are called:

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elements

sub-sets

whole numbers

overlapping sets

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{1, 2, 3}

{5, 6, 7}

{4}

No. of arrangements of the letters of the word plane taking all letters at a time:

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5

1

none

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