Conic Sections

Let a circle C of radius 1 and closer to the origin be such that the lines passing through the point (3, 2) and parallel to the coordinate axes touch it. Then the shortest distance of the circle C from the point (5, 5) is :

1. 4 2
2. 4
3. 5
4. 2 2

Let the line 2x + 3y - k = 0, k > 0, intersect the x-axis and y-axis at the points A and B, respectively. If the equation of the circle having the line segment AB as a diameter is x2 + y2 - 3x - 2y = 0 and the length of the latus rectum of the ellipse x2 + 9y2 = k2 is mn, where m and n are coprime, then 2m + n is equal to

1. 12
2. 13
3. 11
4. 10

Suppose AB is a focal chord of the parabola y2 = 12x of length l and slope m < 3. If the distance of the chord AB from the origin is d, then l d2 is equal to .

Let the circle C1 : x2 + y2 - 2(x + y) + 1 = 0 and C2 be a circle having centre at (-1, 0) and radius 2. If the line of the common chord of C1 and C2 intersects the y-axis at the point P, then the square of the distance of P from the centre of C1 is:

1. 4
2. 6
3. 2
4. 1

Let ABCD and AEFG be squares of side 4 and 2 units, respectively. The point E is on the line segment AB and the point F is on the diagonal AC. Then the radius r of the circle passing through the point F and touching the line segments BC and CD satisfies :

1. r = 1
2. 2r2 - 4r + 1 = 0
3. 2r2 - 8r + 7 = 0
4. r2 - 8r + 8 = 0

Let the maximum and minimum values of ( 8x - x2 - 12 - 4 )2 + (x - 7)2, x R be M and m, respectively. Then M2 - m2 is equal to .

Let a line perpendicular to the line 2x - y = 10 touch the parabola y2 = 4(x - 9) at the point P. The distance of the point P from the centre of the circle x2 + y2 - 14x - 8y + 56 = 0 is .

A square is inscribed in the circle x2+y2-10x-6y+30=0. One side of this square is parallel to y=x+3. If (xi, yi ) are the vertices of the square, then (xi2+yi2 ) is equal to:

1. 152
2. 148
3. 156
4. 160

Let the length of the focal chord PQ of the parabola y2=12x be 15 units. If the distance of PQ from the origin is p, then 10p2 is equal to .

Consider a hyperbola H having centre at the origin and foci on the x-axis. Let C1 be the circle touching the hyperbola H and having the centre at the origin. Let C2 be the circle touching the hyperbola H at its vertex and having the centre at one of its foci. If areas (in sq units) of C1 and C2 are 36 and 4 , respectively, then the length (in units) of latus rectum of H is

1. 283
2. 113
3. 143
4. 103