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Saturday, 31 October

JEE Main 2020 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 8 January 2020, Shift 2, Physics Q1

Question 1 of 75 in this shift, Physics question 1 of 25, Section A.

A simple pendulum is being used to determine the value of gravitational acceleration gg at a certain place. The length of the pendulum is 25.0 cm25.0\ \mathrm{cm} and a stop watch with 1 s1\ \mathrm{s} resolution measures the time taken for 40 oscillations to be 50 s50\ \mathrm{s}. The accuracy in gg is :
  1. (1)3.40%3.40\%
  2. (2)2.40%2.40\%
  3. (3)4.40%4.40\%Official answer
  4. (4)5.40%5.40\%

Official answer

Option 3

NTA final key (Jan 2020).

Chapter
Units and Measurements
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.