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Saturday, 31 October

JEE Main 2021 · PhysicsNumerical answerNumerical valueMediumMulti-step

JEE Main 31 August 2021, Shift 1, Physics Q23

Question 23 of 90 in this shift, Physics question 23 of 30, Section B.

A car is moving on a plane inclined at 30∘30^\circ to the horizontal with an acceleration of 10 ms−2^{-2} parallel to the plane upward. A bob is suspended by a string from the roof of the car. The angle in degrees which the string makes with the vertical is __________. (Take g = 10 ms−2^{-2})

Official answer

30

NTA final key.

Chapter
Laws of Motion
Topic
Newton's Laws of Motion
Idea tested
Pseudo Force Application

Same idea in other shifts

Asked 2× in all
  1. 6 Apr 2026, Shift 1 · Q29Two blocks (PP and QQ) with respectively masses 2 kg and 1.5 kg are joined by a massless thread. These blocks are mounted on a…HardSingle correctHas a figure

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.