JEE Main 2020 · MathsMultiple choiceSingle correctEasyCalculation

JEE Main 9 January 2020, Shift 1, Maths Q66

Question 66 of 75 in this shift, Maths question 16 of 25, Section A.

\mathrm{e}_1

and

\mathrm{e}_2

are the eccentricities of the ellipse,

\frac{x^2}{18}+\frac{y^2}{4}=1

and the hyperbola,

\frac{x^2}{9}-\frac{y^2}{4}=1

respectively and

(\mathrm{e}_1, \mathrm{e}_2)

is a point on the ellipse,

15x^2+3y^2=\mathrm{k}

, then k is equal to :

(1)17
(2)16Official answer
(3)15
(4)14

Official answer

Option 2

NTA final key (Jan 2020).

Chapter: Conic Sections
Topic: Ellipse Eccentricity
Idea tested: Eccentricity calculation

Same idea in other shifts

Asked 11× in all

5 Apr 2026, Shift 1 · Q9Let a focus of the ellipse $E: \frac{x^2}{a^2}+\frac{y^2}{b^2}=1$ be $S(4, 0)$ and its eccentricity be $\frac{4}{5}$ . If the point…EasySingle correct
1 Feb 2024, Shift 1 · Q12For $0<\theta<\pi/2$ , if the eccentricity of the hyperbola $x^2-y^2\mathrm{cosec}^2\theta=5$ is $\sqrt{7}$ times eccentricity of the…MediumSingle correct
1 Feb 2024, Shift 2 · Q13Let $P$ be a point on the ellipse $\frac{x^2}{9}+\frac{y^2}{4}=1$ . Let the line passing through $P$ and parallel to $y$ -axis meet the…HardSingle correct
6 Apr 2023, Shift 2 · Q2In a group of 100 persons 75 speak English and 40 speak Hindi. Each person speaks at least one of the two languages. If the number of…EasySingle correct
25 Jul 2022, Shift 2 · Q12If the ellipse $\frac{x^2}{a^2}+\frac{y^2}{b^2}=1$ meets the line $\frac{x}{7}+\frac{y}{2\sqrt{6}}=1$ on the $x$ -axis and the line…EasySingle correct
27 Jun 2022, Shift 1 · Q13Let the eccentricity of an ellipse $\frac{x^2}{a^2}+\frac{y^2}{b^2}=1$ , $a>b$ , be $\frac{1}{4}$ . If this ellipse passes through the point…EasySingle correct
30 Jun 2022, Shift 1 · Q15Let the eccentricity of the ellipse $x^2 + a^2y^2 = 25a^2$ be b times the eccentricity of the hyperbola $x^2 - a^2y^2 = 5$ , where a is the…HardSingle correct
25 Jul 2021, Shift 1 · Q61Let an ellipse $E:\frac{x^2}{a^2}+\frac{y^2}{b^2}=1$ , $a^2>b^2$ , passes through $\left(\sqrt{\frac{3}{2}},1\right)$ and has eccentricity…HardSingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.