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Friday, 9 October

JEE Main 2020 · MathsMultiple choiceSingle correctMediumMulti-step

JEE Main 6 September 2020, Shift 2, Maths Q69

Question 69 of 75 in this shift, Maths question 19 of 25.

The angle of elevation of the summit of a mountain from a point on the ground is 45∘45^\circ. After climbing up one km towards the summit at an inclination of 30∘30^\circ from the ground, the angle of elevation of the summit is found to be 60∘60^\circ. Then the height (in km) of the summit from the ground is :
  1. (1)3+13−1\frac{\sqrt{3}+1}{\sqrt{3}-1}
  2. (2)13−1\frac{1}{\sqrt{3}-1}Official answer
  3. (3)3−13+1\frac{\sqrt{3}-1}{\sqrt{3}+1}
  4. (4)13+1\frac{1}{\sqrt{3}+1}

Official answer

Option 2

NTA final key (Sep 2020).

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.