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Friday, 9 October

JEE Main 2021 · PhysicsMultiple choiceSingle correctMediumApplication

JEE Main 16 March 2021, Shift 2, Physics Q16

Question 16 of 90 in this shift, Physics question 16 of 30, Section A.

A mosquito is moving with a velocity v⃗=0.5 t2i^+3tj^+9k^\vec{v}=0.5\,t^2\hat{i}+3t\hat{j}+9\hat{k} m/s and accelerating in uniform conditions. What will be the direction of mosquito after 2 s ?
  1. (1)tan⁡−1(52)\tan^{-1}\left(\frac{5}{2}\right) from xx-axis
  2. (2)tan⁡−1(52)\tan^{-1}\left(\frac{5}{2}\right) from yy-axis
  3. (3)tan⁡−1(23)\tan^{-1}\left(\frac{2}{3}\right) from xx-axis
  4. (4)tan⁡−1(23)\tan^{-1}\left(\frac{2}{3}\right) from yy-axisOfficial answer

Official answer

Option 4

NTA final key.

Chapter
Motion in a Plane
Topic
Kinematics in 2D
Idea tested
Vector Calculus for 2D Kinematics

Same topic in other shifts

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  5. 8 Jan 2020, Shift 1 · Q21A particle is moving along the xx-axis with its coordinate with time 't' given by x(t)=10+8t−3t2x(t) = 10+8t-3t^2. Another particle is moving along…MediumNumerical value
  6. 9 Jan 2020, Shift 2 · Q2A particle starts from the origin at t=0t=0 with an initial velocity of 3.0 i^3.0\,\hat{i} m/s and moves in the xx-yy plane with a constant…EasySingle correct

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.