If A = \(\left[ \begin{matrix} 3 & 1 & -1 \\ 2 & -2 & 0 \\ 1 & 2 & -1 \end{matrix} \right] \) and A^-1 = \(\left[ \begin{matrix} { a }_{ 11 } & { a }_{ 12 } & { a }_{ 13 } \\ { a }_{ 21 } & { a }_{ 22 } & { a }_{ 23 } \\ { a }_{ 31 } & { a }_{ 32 } & { a }_{ 33 } \end{matrix} \right] \) then the value of a₂₃ is

(a)

0

(b)

-2

(c)

-3

(d)

-1

If A is a matrix of order m \(\times\) n, then \(\rho\) (A) is _________

(a)

m

(b)

n

(c)

≤ min (m,n)

(d)

≥ min (m,n)

If z = x + iy is a complex number such that |z+2| = |z−2|, then the locus of z is

(a)

real axis

(b)

imaginary axis

(c)

ellipse

(d)

circle

The number of real numbers in [0, 2π] satisfying sin⁴x - 2sin²x + 1 is

(a)

2

(b)

4

(c)

1

(d)

∞

Tangents are drawn to the hyperbola  \(\frac { { x }^{ 2 } }{ 9 } -\frac { { y }^{ 2 } }{ 4 } =1\) parallel to the straight line 2x − y = 1. One of the points of contact of tangents on the hyperbola is

(a)

\(\left(\frac{9}{2 \sqrt{2}}, \frac{-1}{\sqrt{2}}\right)\)

(b)

\(\left(\frac{-9}{2 \sqrt{2}}, \frac{1}{\sqrt{2}}\right)\)

(c)

\(\left(\frac{9}{2 \sqrt{2}}, \frac{1}{\sqrt{2}}\right)\)

(d)

\((3 \sqrt{3},-2 \sqrt{2})\)

If \(\vec { a } ,\vec { b } ,\vec { c } \) are three non-coplanar vectors such that \(\vec { a } \times (\vec { b } \times \vec { c } )=\frac { \vec { b } +\vec { c } }{ \sqrt { 2 } } \), then the angle between \(\vec { a } \ and \ \vec { b } \) is

(a)

\(\frac { \pi }{ 2 } \)

(b)

\(\frac { 3\pi }{ 4 } \)

(c)

\(\frac { \pi }{ 4 } \)

(d)

\( { \pi }\)

The abscissa of the point on the curve \(f\left( x \right) =\sqrt { 8-2x } \) at which the slope of the tangent is -0.25 ?

(a)

-8

(b)

-4

(c)

-2

(d)

0

The value of \(\int _{ 0 }^{ 1 }{ x{ (1-x) }^{ 99 }dx } \) is

(a)

\(\frac{1}{11000}\)

(b)

\(\frac{1}{10100}\)

(c)

\(\frac{1}{10010}\)

(d)

\(\frac{1}{10001}\)

If p and q are the order and degree of the differential equation \(y=\frac { dy }{ dx } +{ x }^{ 3 }\left( \frac { { d }^{ 2 }y }{ { dx }^{ 2 } } \right) +xy=cosx,\) When

(a)

p < q

(b)

p = q

(c)

p > q

(d)

p exists and q does not exist

A pair of dice numbered 1, 2, 3, 4, 5, 6 of a six-sided die and 1, 2, 3, 4 of a four-sided die is rolled and the sum is determined. Let the random variable X denote this sum. Then the number of elements in the inverse image of 7 is

(a)

1

(b)

2

(c)

3

(d)

4