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NCERT Solutions for class 11 Maths | Chapter 11 - Conic Sections

(1) The equation of the parabola with vertex at (0, 0) and focus at ((-5/2), 0) is _____________.
[A] y2 = -10x
[B] y2 = 10x
[C] x2 = -10y
[D] x2 = 10y
Answer: y2 = -10x
(2) Choose the false statement.
[A] x2 = 4 ay represents the upward parabola.
[B] x2 = -4 ay represents downward parabola.
[C] y2 = 4 ax represents the right handed parabola.
[D] y2 = -4 ax represents the right handed parabola.
Answer: y2 = -4 ax represents the right handed parabola.

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(3) A parabolic reflector is 10 cm in diameter. It's depth is 2.5 cm. The focus will be _______.
[A] (2.5, 0)
[B] (0, 2.5)
[C] (5, 0)
[D] (0, 5)
Answer: (2.5, 0)
(4) The equation of the circle having radius 3 units and which touches the y-axis at the origin and lies in the 1st and 4thquadrant is ____.
[A] x2 + y2 = 9
[B] x2 -6x + 6y + y2 = 0
[C] x2 - 6y + y2 = 0
[D] x2 - 6x + y2 = 0
Answer: x2 - 6x + y2 = 0
(5) The area of the circle is 154 square units. The equation of 2 of its diameters are x + y = 6 and x + 2y = 4. Then, the equation of the circle is ____.
[A] x2 + y2 - 16x + 2y + 49 = 0
[B] x2 + y2 - 16x + 2y + 19 = 0
[C] x2 + y2 - 16x + 16y + 19 = 0
[D] x2 + y2 - 2x + 2y + 19 = 0
Answer: x2 + y2 - 16x + 2y + 19 = 0
(6) The equation of the directrix of x2 = -8y is _____.
[A] -8
[B] 8
[C] 2
[D] -2
Answer: 2
(7) The eccentricity of the ellipse is ___________
[A] 0 < e < 1
[B] -1 < e < 0
[C] -1 < e < 1
[D] -1 < e < ∞
Answer: 0 < e < 1
(8) A ray of light moving parallel to the x-axis gets reflected from a parabolic mirror whose equation is (y - 2)2 = 4(x + 1). Then, after reflection, the ray must pass through the point ___________.
[A] (2, -1)
[B] (0, 2)
[C] (-1, 2)
[D] (1, 0)
Answer: (0, 2)
(9) The co-ordinates of the foci of an ellipse are (4, 0), (-4, 0). It represents a ______.
[A] horizontal ellipse
[B] vertical ellipse
[C] nil
[D] nil
Answer: horizontal ellipse
(10) Choose the false statement.
[A] x2 = 4 ay represents the upward parabola.
[B] x2 = -4 ay represents downward parabola.
[C] y2 = 4 ax represents the right handed parabola.
[D] y2 = -4 ax represents the right handed parabola.
Answer: y2 = -4 ax represents the right handed parabola.
(11) If one end point of the diameter of the circle x2 + y2 - 8x - 4y + c = 0 is (-3, 2), then the other end of the diameter of the circle is ____.
[A] (3, 2)
[B] (0, 0)
[C] (11, 2)
[D] (-11, 2)
Answer: (11, 2)
(12) A circle of radius 5 units has its centre on the positive x-axis. If the circle passes through the point (2, 3), then the centre of the circle is ____.
[A] (5, 0)
[B] (2, 0)
[C] (6, 0)
[D] (7, 0)
Answer: (6, 0)
(13) The length of the transverse axis is the distance between the ____.
[A] two foci
[B] focus and the vertex
[C] two vertices
[D] vertex and the origin
Answer: two vertices
(14) The set of all points in a plane whose difference of distances from two fixed points is constant is
[A] Parabola
[B] Hyperbola
[C] Ellipse
[D] Circle
Answer: Hyperbola
(15) The equation of the parabola with focus F (4, 0) and directrix x = -4 is given by ______.
[A] y2 = 4x
[B] y2 = -16x
[C] y2 = 16x
[D] y2 = -4x
Answer: y2 = 16x
(16) The equation of the parabola with vertex at the origin, passing through the point (2, 3) and symmetric with respect to Y-axis is ______.
[A] 3 y2 = 4x
[B] 3 x2 = 4y
[C] y2 = 4x
[D] x2 = 3y
Answer: 3 x2 = 4y
(17) The points on the parabola y2 = 18x, where the ordinate is equal to three times the abscissa are _________________.
[A] (0, 0) and (6, 18)
[B] (0, 0) and (3, 9)
[C] (0, 0) and (1, 3)
[D] (0, 0) and (2, 6)
Answer: (0, 0) and (2, 6)
(18) The centre of the circle drawn on the intercepts between the axes made by the line 3x + y = 12 as diameter is ____.
[A] (4, 12)
[B] (2, 6)
[C] (-4, 12)
[D] (4, -12)
Answer: (2, 6)
(19) If y = 2x is a chord of the circle x2 + y2 - 10x = 0, then the equation of the circle with the chord as diameter is ____.
[A] x2 + y2 - 2x - 4y = 0
[B] x2 + y2 - 10x - 4y = 0
[C] x2 + y2 - 2x - 10y = 0
[D] x2 + y2 - x - y = 0
Answer: x2 + y2 - 2x - 4y = 0
(20) The equation of the circle having radius 3 units and which touches the y-axis at the origin and lies in the 1st and 4thquadrant is ____.
[A] x2 + y2 = 9
[B] x2 -6x + 6y + y2 = 0
[C] x2 - 6y + y2 = 0
[D] x2 - 6x + y2 = 0
Answer: x2 - 6x + y2 = 0

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