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Ellipse - JEE Main Previous Year Question with Solutions

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Q. The ellipse $x^{2}+4 y^{2}=4$ is inscribed in a rectangle aligned with the coordinate axes, which in turn is inscribed in another ellipse that passes through the point (4, 0). Then the equation of the ellipse is :- (1) $4 x^{2}+48 y^{2}=48$ (2) $4 x^{2}+64 y^{2}=48$ (3) $x^{2}+16 y^{2}=16$ (4) $x^{2}+12 y^{2}=16$ [AIEEE-2009]
Ans. (4)
Q. Equation of the ellipse whose axes are the axes of coordinates and which passes through the point (–3, 1) and has eccentricity $\sqrt{2 / 5}$ is :- (1) $3 x^{2}+5 y^{2}-15=0$ (2) $5 x^{2}+3 y^{2}-32=0$ (3) $3 x^{2}+5 y^{2}-32=0$ (4) $5 x^{2}+3 y^{2}-48=0$ [AIEEE-2011]
Ans. (3) $\frac{\mathrm{x}^{2}}{\mathrm{a}^{2}}+\frac{\mathrm{y}^{2}}{\mathrm{b}^{2}}=1 \mathrm{e}=\sqrt{\frac{2}{5}}$ It passes through $(-3,1)$ so $\frac{9}{a^{2}}+\frac{1}{b^{2}}=1$ .....(1) also $1-\frac{b^{2}}{a^{2}}=e^{2} \Rightarrow 1-\frac{b^{2}}{a^{2}}=\frac{2}{5}$ $\frac{b^{2}}{a^{2}}=\frac{3}{5}$ .....(2) solve $(1) \&(2) \mathrm{a}^{2}=\frac{32}{3}, \mathrm{b}^{2}=\frac{32}{5} 0$
Q. An ellipse is drawn by taking a diameter of the circle $(x-1)^{2}+y^{2}=1$ as its semi-minor axis and a diameter of the circle $x^{2}+(y-2)^{2}=4$ as its semi-major axis. If the centre of the ellipse is at the origin and its axes are the coordinate axes, then the equation of the ellipse is : (1) $x^{2}+4 y^{2}=16$ (2) $4 x^{2}+y^{2}=4$ (3) $x^{2}+4 y^{2}=8$ (4) $4 x^{2}+y^{2}=8$ [AIEEE-2012]
Ans. (1) Let the equation of ellipse be $\frac{x^{2}}{a^{2}}+\frac{y^{2}}{b^{2}}=1$ from the given conditions $\mathrm{a}=4$ and $\mathrm{b}=2$ $\therefore \mathrm{Eq}$ of ellipse is $\frac{\mathrm{x}^{2}}{16}+\frac{\mathrm{y}^{2}}{4}=1$ or $\mathrm{x}^{2}+4 \mathrm{y}^{2}=16$
Q. Statement-1: An equation of a common tangent to the parabola $\mathrm{y}^{2}=16 \sqrt{3} \mathrm{x}$ and the ellipse $2 \mathrm{x}^{2}+\mathrm{y}^{2}=4$ is $\mathrm{y}=2 \mathrm{x}+2 \sqrt{3}$ Statement-2: If the line $y=m x+\frac{4 \sqrt{3}}{m},(m \neq 0)$ is a common tangent to the parabola $y^{2}=$ $$ 16 \sqrt{3} x \text { and the ellipse } 2 x^{2}+y^{2}=4, \text { then } m \text { satisfies } m^{4}+2 m^{2}=24$$ (1) Statement–1 is true, Statement–2 is false. (2) Statement–1 is false, Statement–2 is true. (3) Statement–1 is true, Statement–2 is true ; Statement–2 is a correct explanation for Statement–1. (4) Statement–1 is true, Statement–2 is true ; Statement–2 is not a correct explanation for Statement– 1. [AIEEE-2012]
Ans. (3) Let equation of any tangent to $\mathrm{y}^{2}=16 \sqrt{3} \mathrm{x}$ be $\mathrm{y}=\mathrm{mx}+\frac{4 \sqrt{3}}{\mathrm{m}}$ and equation of any tangent to $2 \mathrm{x}^{2}+\mathrm{y}^{2}=4$ be $\mathrm{y}=\mathrm{mx}+\sqrt{2 \mathrm{m}^{2}+4} \ldots \ldots$ (ii) but $(\mathrm{i})$ and (ii) are same lines $\therefore \frac{4 \sqrt{3}}{\mathrm{m}}=\sqrt{2 \mathrm{m}^{2}+4}$ $\Rightarrow \mathrm{m}^{4}+2 \mathrm{m}^{2}-24=0$ $\Rightarrow \mathrm{m}^{2}=-6,4$ $\therefore \mathrm{m}=\pm 2$
Q. The equation of the circle passing through the foci of the ellipse $\frac{x^{2}}{16}+\frac{y^{2}}{9}=1$ and having centre at $(0,3)$ is : (1) $x^{2}+y^{2}-6 y-7=0$ (2) $x^{2}+y^{2}-6 y+7=0$ (3) $x^{2}+y^{2}-6 y-5=0$ (4) $x^{2}+y^{2}-6 y+5=0$ [JEE (Main)-2013]
Ans. (1) $\frac{x^{2}}{16}+\frac{y^{2}}{9}=1$ $e=\sqrt{1-\frac{b^{2}}{a^{2}}}=\frac{\sqrt{7}}{4}$ foci $(\pm a e, 0) \equiv(\pm \sqrt{7}, 0)$ centre of circle is $(0,3)$ $\mathrm{x}^{2}+\mathrm{y}^{2}-6 \mathrm{y}+\mathrm{c}=0$ passes through $(\sqrt{7}, 0)$ $7+0-0+\mathrm{c}=0$ $\mathrm{c}=-7$ So $\mathrm{x}^{2}+\mathrm{y}^{2}-6 \mathrm{y}-7=0$
Q. If a and $c$ are positive real number and the ellipse $\frac{x^{2}}{4 c^{2}}+\frac{y^{2}}{c^{2}}=1$ has four distinct points in common with the circle $x^{2}+y^{2}=9 a^{2},$ then (1) $6 \mathrm{ac}+9 \mathrm{a}^{2}-2 \mathrm{c}^{2}>0$ (2) $6 a c+9 a^{2}-2 c^{2}<0$ (3) $9 \mathrm{ac}-9 \mathrm{a}^{2}-2 \mathrm{c}^{2}<0$ (4) $9 \mathrm{ac}-9 \mathrm{a}^{2}-2 \mathrm{c}^{2}>0$ [JEE-Main (On line)-2013]
Ans. (4) $\mathrm{c}<3 \mathrm{a}<2 \mathrm{c}$ $3 \mathrm{a}-\mathrm{c}>0$ $2 \mathrm{c}-3 \mathrm{a}>0$ $\because(3 \mathrm{a}-\mathrm{c})(2 \mathrm{c}-3 \mathrm{a})>0$ $9 \mathrm{ac}-9 \mathrm{a}^{2}-2 \mathrm{c}^{2}>0$
Q. Equation of the line passing through the points of intersection of the parabola $x^{2}=8 y$ and the ellipse $\frac{x^{2}}{3}+y^{2}=1$ is : - (1) y + 3 = 0 (2) 3y + 1 = 0 (3) 3y – 1 = 0 (4) y – 3 = 0 [JEE-Main (On line)-2013]
Ans. (3) Put $x^{2}=8 y$ in $\frac{x^{2}}{3}+y^{2}=1$ $\quad=(y+3)(3 y-1)=0$ $\mathrm{y}+3=0$ $3 \mathrm{y}-1=0$
Q. Let the equations of two ellipses be $\mathrm{E}_{1}: \frac{\mathrm{x}^{2}}{3}+\frac{\mathrm{y}^{2}}{2}=1$ and $\mathrm{E}_{2}: \frac{\mathrm{x}^{2}}{16}+\frac{\mathrm{y}^{2}}{\mathrm{b}^{2}}=1 .$ If the product of their eccentricities is $\frac{1}{2},$ then the length of the minor axis of ellipse $\mathrm{E}_{2}$ is :- (1) 9          (2) 8             (3) 2              (4) 4 [JEE-Main (On line)-2013]
Ans. (4) $\mathrm{e}_{1} \mathrm{e}_{2}=\frac{1}{2}$ $\Rightarrow \quad \sqrt{1-\frac{2}{3}} \sqrt{1-\frac{\mathrm{b}^{2}}{16}}=\frac{1}{2} \quad$ if $16>\mathrm{b}^{2}$ $=\left(16-\mathrm{b}^{2}\right)=12$ $=\mathrm{b}^{2}=4 \quad \Rightarrow \mathrm{b}=2$ length of minor axis = 4
Q. If the curves $\frac{x^{2}}{\alpha}+\frac{y^{2}}{4}=1$ and $y^{3}=16 x$ intersect at right angles, then a value of $\alpha$ is : (1) $\frac{4}{3}$ (2) $\frac{3}{4}$ (3) $\frac{1}{2}$ (4) 2 [JEE-Main (On line)-2013]
Ans. (1) $\frac{\mathrm{x}^{2}}{\alpha}+\frac{\mathrm{y}^{2}}{4}=1 \& \mathrm{y}^{3}=16 \mathrm{x}$ d.w.r. to x. $\frac{2 \mathrm{x}}{\alpha}+\frac{\mathrm{y}}{2} \mathrm{y}^{\prime}=0 \quad \& \quad 3 \mathrm{y}^{2} \mathrm{y}^{\prime}=16$ $\mathrm{y}^{\prime}=-\frac{4 \mathrm{x}}{\alpha \mathrm{y}} \& \mathrm{y}^{\prime}=\frac{16}{3 \mathrm{y}^{2}}$ Both are orthogonal $\Rightarrow-\frac{4 \mathrm{x}}{\alpha \mathrm{y}} \cdot \frac{16}{3 \mathrm{y}^{2}}=-1$ $\alpha=\frac{4}{3} \quad$ as $\left(16 \mathrm{x}=\mathrm{y}^{3}\right)$
Q. A point on the ellipse, $4 \mathrm{x}^{2}+9 \mathrm{y}^{2}=36,$ where the normal is parallel to the line, $4 \mathrm{x}-2 \mathrm{y}-5$ $=0,$ is : $-$ (1) $\left(\frac{8}{5},-\frac{9}{5}\right)$ (2) $\left(-\frac{9}{5}, \frac{8}{5}\right)$ ( 3)$\left(\frac{8}{5}, \frac{9}{5}\right)$ ( 4)$\left(\frac{9}{5}, \frac{8}{5}\right)$ [JEE-Main (On line)-2013]
Ans. (4) $\frac{\mathrm{x}^{2}}{9}+\frac{\mathrm{y}^{2}}{4}=1$ Any point $(3 \cos \theta, 2 \mathrm{sin} \theta)$ Slope of normal $=2$ Slope of tangent $=-\frac{1}{2}=-\frac{2 \cos \theta}{3 \sin \theta}$ $\tan \theta=\frac{4}{3}$ $\sin \theta=\frac{4}{5} \quad \cos \theta=\frac{3}{5}$ Point $\left(\frac{9}{5}, \frac{8}{5}\right)$
Q. The locus of the foot of perpendicular drawn from the centre of the ellipse $x^{2}+3 y^{2}=6$ on any tangent to it is :- (1) $\left(x^{2}-y^{2}\right)^{2}=6 x^{2}+2 y^{2}$ (2) $\left(x^{2}-y^{2}\right)^{2}=6 x^{2}-2 y^{2}$ (3) $\left(x^{2}+y^{2}\right)^{2}=6 x^{2}+2 y^{2}$ (4) $\left(x^{2}+y^{2}\right)^{2}=6 x^{2}-2 y^{2}$ [JEE(Main)-2014]
Ans. (3) Let the foot of perpendicular be (h, k) then $\mathrm{m}_{\mathrm{op}}=\frac{\mathrm{k}}{\mathrm{h}}$ equation of tangent is $\mathrm{y}=\mathrm{mx} \pm \sqrt{\mathrm{a}^{2} \mathrm{m}^{2}+\mathrm{b}^{2}}$ $\mathrm{y}=\mathrm{mx} \pm \sqrt{6 \mathrm{m}^{2}+2}$ satisfied by $(\mathrm{h}, \mathrm{k})$ and $\mathrm{m}=-\frac{1}{\mathrm{m}_{\mathrm{op}}}=-\frac{\mathrm{h}}{\mathrm{k}}$ $\left(\mathrm{k}+\frac{\mathrm{h}^{2}}{\mathrm{k}}\right)^{2}=\frac{6 \mathrm{h}^{2}}{\mathrm{k}^{2}}+2$ multiply by $\mathrm{k}^{2}$ $\left(\mathrm{k}^{2}+\mathrm{h}^{2}\right)^{2}=6 \mathrm{h}^{2}+2 \mathrm{k}^{2}$ $\Rightarrow\left(\mathrm{x}^{2}+\mathrm{y}^{2}\right)^{2}=6 \mathrm{x}^{2}+2 \mathrm{y}^{2}$
Q. The area (in sq. units) of the quadrilateral formed by the tangents at the end points of the latera recta to the ellipse $\frac{x^{2}}{9}+\frac{y^{2}}{5}=1$ is : (1) $\frac{27}{2}$ (2) 27 (3) $\frac{27}{4}$ (4) 18 [JEE(Main)-2015]
Ans. (2)
Q. The eccentricity of an ellipse centre is at the origin is $\frac{1}{2} .$ If one of its directices is $\mathrm{x}=-4,$ then the equation of the normal to it at $\left(1, \frac{3}{2}\right)$ is : - (1) x + 2y = 4 (2) 2y – x = 2 (3) 4x – 2y = 1 (4) 4x + 2y = 7 [JEE(Main)-2017]
Ans. (3) Eccentricity of ellipse $=\frac{1}{2}$

Leave a comment


April 23, 2022, 8:34 p.m.
Potato has been here
Feb. 17, 2021, 2:52 p.m.
Thank you
Feb. 13, 2021, 5:15 p.m.
No questions after 2017 and here I am in 2021?
Dec. 28, 2020, 7:02 a.m.
Thanks a lot 😊.
Oct. 12, 2020, 11:54 p.m.
Aug. 16, 2020, 8:10 a.m.
Plz try to update the questions from recent years too. Good questions. Thank you
Aug. 10, 2020, 8:05 p.m.
santosh kumar
Aug. 6, 2020, 4:16 p.m.
update latest quesations
July 23, 2020, 8:59 p.m.
Nice Questions
July 19, 2020, 12:32 a.m.
July 16, 2020, 11:47 p.m.
I want to see 2018,2019 &amp; 2020 questions also since the pattern has been changed with the year.plz.... update as fast as possible .
July 6, 2020, 12:46 p.m.
Good questions and quality of questions has been increasing from year to year
June 23, 2020, 5:46 p.m.
yup good...
June 3, 2020, 8:10 a.m.
What did Jayasree say it is correct.
May 22, 2020, 11:42 a.m.
Chill bro
May 16, 2020, 3:09 p.m.
Plz give all the previous years questions related to some chapter
April 10, 2020, 2 p.m.
It would be very better if there are questions from remaining years also

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