Question # 1

The sum of first twenty odd integers in A.P is

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400

397

404

408

The quadratic equation 8 sec²θ- 6 secθ+1 = 0 has

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Infinitely many roots

Exactly two roots

Exactly four roots

No roots

Additive inverse of - a - b is

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a

-a + b

a - b

a + b

If sinαand cosαare the roots of the equation px²+ qx + r =0, then

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p²- q²+ 2pr = 0

(p + r)²= q²- r²

p²+ q²- 2pr = 0

(p - r)²= q²+ r²

In an A.P,a +(n-a)d is

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1st term

General term

Last term

None of these

Find a if 1 is a root of the equation x²+ ax + 2 = 0

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3

-3

2

0

n(n - 1) (n - 2) in factorial form is

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i⁹ =

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i²

-1

1

i

sin(a + β)+sin(a -β) =_____;

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2cosa cosβ

2sina cosβ

2cosa sinβ

-2sina sinβ

(x3-1/x)12

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295

495

395

722

The square matrix A is skew Hermitian when (A)'=

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A

A'

-A

A

The velocity and acceleration at any point t of a particle which moves along straight line x = 5r-3

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5,3

5,-3

5,0

10,0

The approximate increase in the area of a circular disc if its diameter increased form 44cm to 44.4cm is

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0.4cm

8.8πcm

17.6 πcm

35.2πcm

√x = ______ if is a prime number

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Rational no

Natural no

Irrational no

Complex no

n(n - 1) (n - 2) .... (n - r + 1) = ______

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The set of integer is

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Finite group

A group w.r.t addition

A group w.r.t multiplication

Not a group

Area ofΔABC=

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ab sinα

1/2 ab sinα

1/2 ac sinγ

1/2 ac sinβ

(a^-1)^-1=

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a^-1

a

-a

None of above

For≥ -2 , 1+3+5+......+(2n+5)

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(n+2)²

(n-2)²

2n+1

(n+3)²

The equation of the parabola with directirx x = 2 and the axis y = 0 is

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y²= 8x

y²= -8x

y²= 4x

y²= -4x

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direction ratios

direction cosines

direction angles

none of these

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Principle of equality of fractions

Rule for product of fraction

Rule for quotient of fraction

Golden rule of fractions

sin 2 α=

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A finite set

An infinite set

An empty set

None of these

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6

20

0

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1

0

3

-1

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xy

y

0

x

w²⁸+ w³⁸= ______

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0

1

w

-1

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