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Saturday, 31 October

JEE Main 2021 · MathsMultiple choiceSingle correctEasyApplication

JEE Main 24 February 2021, Shift 2, Maths Q75

Question 75 of 90 in this shift, Maths question 15 of 30, Section A.

The angle of elevation of a jet plane from a point A on the ground is 60∘60^\circ. After a flight of 20 seconds at the speed of 432 km/hour, the angle of elevation changes to 30∘30^\circ. If the jet plane is flying at a constant height, then its height is :
  1. (1)360033600\sqrt{3} m
  2. (2)240032400\sqrt{3} m
  3. (3)180031800\sqrt{3} m
  4. (4)120031200\sqrt{3} mOfficial answer

Official answer

Option 4

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 108 of the 174 JEE Main shifts held from 2017 to 2026.