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Saturday, 31 October

JEE Main 2021 · MathsMultiple choiceSingle correctEasyConceptual

JEE Main 31 August 2021, Shift 1, Maths Q74

Question 74 of 90 in this shift, Maths question 14 of 30, Section A.

The length of the latus rectum of a parabola, whose vertex and focus are on the positive xx-axis at a distance R and S (>> R) respectively from the origin, is :
  1. (1)2(S+R)2(\mathrm{S}+\mathrm{R})
  2. (2)2(S−R)2(\mathrm{S}-\mathrm{R})
  3. (3)4(S+R)4(\mathrm{S}+\mathrm{R})
  4. (4)4(S−R)4(\mathrm{S}-\mathrm{R})Official answer

Official answer

Option 4

NTA final key.

Chapter
Conic Sections
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.