Conic Sections
ICSE · Class 11 · Mathematics
Practice quiz for Conic Sections — ICSE Class 11 Mathematics. MCQs and questions with answers to test your preparation.
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Find the eccentricity of the ellipse x^2/25 + y^2/16 = 1.
For the ellipse 16x^2 + 25y^2 = 400, find PF1 + PF2 for any point P on the ellipse.
Find the equation of the ellipse whose foci are (-2, 4) and (4, 4) and whose length of major axis is 10.
Find the equation of the parabola whose vertex is (0, 0) and focus is (3, 0).
Sample Questions
For the parabola y^2 = 8x, find the coordinates of a point whose focal distance is 4 units.
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(2, 4) and (2, -4)
The parabola y^2 = 8x is y^2 = 4ax, so a = 2. Its focus is (2, 0). Let the point be (x, y). Focal distance 4 gives (x - 2)^2 + y^2 = 16. Since the point lies on the parabola, y^2 = 8x. Substituting gives (x - 2)^2 + 8x = 16, so x^2 + 4x - 12 = 0, giving x = 2 or -6. Only x = 2 fits the parabola. Then y^2 = 16, so y = ±4.
Find the directrix of the parabola whose vertex is (-3, 0) and directrix is x + 5 = 0?
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x = -5
The directrix is already given by x + 5 = 0, which simplifies to x = -5.
For the hyperbola x^2/16 - y^2/9 = 1, find its eccentricity.
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5/4
Here a^2 = 16 and b^2 = 9. So c = √(a^2 + b^2) = √(25) = 5. Then e = c/a = 5/4.
Find the length of the latus rectum of the hyperbola x^2/36 - y^2/64 = 1.
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64/3
Here a = 6 and b = 8. The latus rectum length is 2b^2/a = 2(64)/6 = 64/3.
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