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Friday, 9 October

NEET UG 2019 · Physics · Question 42

NEET 2019 Physics, question 42

Question 42 of the NEET 2019 paper (code P1) is a Physics question from Oscillations. Its idea, Reference Circle Method (Phasors), was asked only this once in NEET 2017–2026. The NTA final answer key gives option 4.

Updated 2026-10-08

Q42 · Physics

The radius of circle, the period of revolution, initial position and sense of revolution are indicated in the fig.

y - projection of the radius vector of rotating particle P is :

The figure, described in words

Circle of radius 3 m centred at origin; particle P at top on y-axis at t = 0; rotating clockwise with T = 4 s.

  1. 1y(t)=−3cos⁡2πty(t) = -3\cos 2\pi t, where y in m
  2. 2y(t)=4sin⁡(πt2)y(t) = 4\sin\left(\frac{\pi t}{2}\right), where y in m
  3. 3y(t)=3cos⁡(3πt2)y(t) = 3\cos\left(\frac{3\pi t}{2}\right), where y in m
  4. 4y(t)=3cos⁡(πt2)y(t) = 3\cos\left(\frac{\pi t}{2}\right), where y in mOfficial answer

Official answer: option 4 · NTA final answer key

Same idea

The only question on Reference Circle Method (Phasors)

No other NEET paper from 2017–2026 tested this exact idea.

Reference Circle Method (Phasors): every question and how it was framed

The chapter

Oscillations in ten years of NEET

17 questions from 2017–2026, asked in 10 of 10 papers, about 1.6 a paper. Simple Harmonic Motion alone had 16.

Chapter analysisStudy this chapterPractise this chapter

Oscillations: questions per paper

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