1
JEE Main 2024 (Online) 27th January Morning Shift
+4
-1
The length of the chord of the ellipse $\frac{x^2}{25}+\frac{y^2}{16}=1$, whose mid point is $\left(1, \frac{2}{5}\right)$, is equal to :
A
$\frac{\sqrt{1691}}{5}$
B
$\frac{\sqrt{2009}}{5}$
C
$\frac{\sqrt{1541}}{5}$
D
$\frac{\sqrt{1741}}{5}$
2
JEE Main 2023 (Online) 13th April Morning Shift
+4
-1
Out of Syllabus

Let the tangent and normal at the point $$(3 \sqrt{3}, 1)$$ on the ellipse $$\frac{x^{2}}{36}+\frac{y^{2}}{4}=1$$ meet the $$y$$-axis at the points $$A$$ and $$B$$ respectively. Let the circle $$C$$ be drawn taking $$A B$$ as a diameter and the line $$x=2 \sqrt{5}$$ intersect $$C$$ at the points $$P$$ and $$Q$$. If the tangents at the points $$P$$ and $$Q$$ on the circle intersect at the point $$(\alpha, \beta)$$, then $$\alpha^{2}-\beta^{2}$$ is equal to :

A
61
B
$$\frac{304}{5}$$
C
60
D
$$\frac{314}{5}$$
3
JEE Main 2023 (Online) 12th April Morning Shift
+4
-1

Let $$\mathrm{P}\left(\frac{2 \sqrt{3}}{\sqrt{7}}, \frac{6}{\sqrt{7}}\right), \mathrm{Q}, \mathrm{R}$$ and $$\mathrm{S}$$ be four points on the ellipse $$9 x^{2}+4 y^{2}=36$$. Let $$\mathrm{PQ}$$ and $$\mathrm{RS}$$ be mutually perpendicular and pass through the origin. If $$\frac{1}{(P Q)^{2}}+\frac{1}{(R S)^{2}}=\frac{p}{q}$$, where $$p$$ and $$q$$ are coprime, then $$p+q$$ is equal to :

A
143
B
147
C
137
D
157
4
JEE Main 2023 (Online) 11th April Evening Shift
+4
-1
Out of Syllabus

If the radius of the largest circle with centre (2,0) inscribed in the ellipse $$x^2+4y^2=36$$ is r, then 12r$$^2$$ is equal to :

A
72
B
92
C
115
D
69
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