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Friday, 9 October

JEE Main 2021 · MathsMultiple choiceSingle correctMediumMulti-step

JEE Main 25 July 2021, Shift 1, Maths Q73

Question 73 of 90 in this shift, Maths question 13 of 30, Section A.

A spherical gas balloon of radius 16 meter subtends an angle 60∘60^\circ at the eye of the observer A while the angle of elevation of its center from the eye of A is 75∘75^\circ. Then the height (in meter) of the top most point of the balloon from the level of the observer's eye is :
  1. (1)8(2+23+2)8(2+2\sqrt3+\sqrt2)
  2. (2)8(6+2+2)8(\sqrt6+\sqrt2+2)Official answer
  3. (3)8(6−2+2)8(\sqrt6-\sqrt2+2)
  4. (4)8(2+2+3)8(\sqrt2+2+\sqrt3)

Official answer

Option 2

NTA final key.

Chapter
Trigonometric Functions
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 42 of the 174 JEE Main shifts held from 2017 to 2026.