Question(s) from Search: IIT

(Multiple choices)
The determinant
  is equal to zero if

a) a, b, c are in arithmetic progression

b) a, b, c are in geometric progression

c) a, b, c are in harmonic progression

d) α is a root of the equation ax² + bx + c = 0

e) x – α is a factor of ax² + 2bx + c

Let f(x) =  and m(b) be the minimum value of f(x). As b varies, range of m(b) is

a)

b) [ 0,

c) [

d)

At any point P on the parabola  , a tangent is drawn which meets the directrix at Q. Find the locus of the point R which divides QP externally in the ratio  .

The set of all real numbers x for which  is

a)

b)

c)

d)

The cube roots of unity when represented on argand diagram form the vertices of an equilateral triangle.

a) True

b) False

If  is a solution of  and  then  is equal to

a)

b)

c) 1

d)

If one root is square of the other root of the equation  then the relation between p and q is

a)

b)

c)

d)

If a ≠ p, b ≠ q, c ≠ r and
 = 0

Then find the value of
  +  +

a) 0

b) 1

c) 2

d) 3

The radius of the circle passing through the focii of the ellipse  and having centre at (0, 3) is

a) 4

b) 3

c)

d)

The number of solutions of the pair of equations

in the interval [ 0, 2π ] is

a) 0

b) 1

c) 2

d) 4

Multiple choice question

On the ellipse  the points at which the tangents are parallel to the line  are

a)

b)

c)

d)

The equation  has

a) At least one real solution

b) Exactly three real solutions

c) Has exactly one irrational solution

d) Complex roots

Show that for for any triangle with sides a, b, c
3 (ab + bc + ac) ≤ (a + b + c)² < 4 (ab + bc + ca)

The solution set of equation  = 0 is ……….

a) {0}

b) {1, 2}

c) {−1, 2}

d) {−1, −2}

An ellipse has eccentricity  and one of the focus at the point  It’s one directrix is the common tangent near to the point P to the circle  and the hyperbola . Then the equation of the ellipse in the statement form is . . . . .

The equation  has

a) no real solutions

b) one real solution

c) two real solutions

d) infinite real solutions

For positive numbers x, y and z the numerical value of the determinant
 is ………..

a) 1

b) –1

c) ±1

d) 0

The equation  represents

a) No locus if k > 0

b) An ellipse if k < 0

c) A point if k = 0

d) A hyperbola if k > 0

If a > 0, b > 0, c > 0, prove that  

The third term of Geometric Progression is 4. The product of the five terms is

a)

b)

c)

d)

If the line  touches the hyperbola  then the point of contact is

a)

b)

c)

d)

Let  then one of the possible value of k is

a) 1

b) 2

c) 4

d) 16

Two events A and B have probabilities 0.25 and 0.50 respectively. The possibility of both A and B occur simultaneously is 0.14 then the probability that neither A nor B occur is

a) 0.39

b) 0.25

c) 0.11

d) None of these

Find the set of all x for which

Sum of the first n terms of the series  is

a) 2ⁿ – n – 1

b) 1 – 2^{− n}

c) n + 2^{− n} – 1

d) 2ⁿ + 1