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JEE Main 2020 — Experimental Physics Question with Solution

JEE Main 2020 (06 Sep Shift 2)

Question

A student measuring the diameter of a pencil of circular cross-section with the help of a vernier scale records the following four readings 5.50 mm, 5.55 mm, 5.34 mm, 5.65 mm. The average of these four reading is 5.5375 mm and the standard deviation of the data is 0.07395 mm. The average diameter of the pencil should therefore be recorded as :

Choose an option

Show full solutionCorrect option: D
Correct answer
D5.54±0.07mm

Step-by-step explanation

Significant rule says that reading should has same significant figure as that of reading given.

5.5375→ rounded to →5.54.

0.07395→ rounded to→0.07

therefore, 5.54±0.07 mm

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About this question

This is a previous-year question from JEE Main 2020, covering the Experimental 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.