JEE Main 2020PhysicsMathematics in PhysicsMediumMCQ

JEE Main 2020 — Mathematics in Physics Question with Solution

JEE Main 2020 (08 Jan Shift 2)

Question

A simple pendulum is being used to determine the value of gravitational acceleration g at a certain place. The length of the pendulum is 25.0 cm and a stopwatch with 1 s resolution measures the time taken for 40 oscillations to be 50 s. The accuracy in g is:

Choose an option

Show full solutionCorrect option: C
Correct answer
C4.40%

Step-by-step explanation

Time period of the simple pendulum, T=2πlg ⇒g=4π2lT2

∆gg=2∆TT+∆LL⇒∆gg=2150+0.125.0

⇒∆gg=4.4%

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About this question

This is a previous-year question from JEE Main 2020, covering the Mathematics in Physics chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.