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Saturday, 31 October

JEE Main 2021 · MathsMultiple choiceSingle correctMediumMulti-step

JEE Main 27 August 2021, Shift 2, Maths Q72

Question 72 of 90 in this shift, Maths question 12 of 30, Section A.

A differential equation representing the family of parabolas with axis parallel to yy-axis and whose length of latus rectum is the distance of the point (2,−3)(2, -3) form the line 3x+4y=53x + 4y = 5, is given by :
  1. (1)11d2xdy2=1011\frac{d^2x}{dy^2} = 10
  2. (2)10d2ydx2=1110\frac{d^2y}{dx^2} = 11
  3. (3)11d2ydx2=1011\frac{d^2y}{dx^2} = 10Official answer
  4. (4)10d2xdy2=1110\frac{d^2x}{dy^2} = 11

Official answer

Option 3

NTA final key.

Topic
No close match in our taxonomy
Idea tested
No close match in our taxonomy

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.