Practice question
Question
Time intervals measured by a clock give the following readings: 1.25 s, 1.24 s, 1.27 s, 1.21 s and 1.28 s. What is the percentage relative error of the observations?\[NEET 2020\]
Explanation
A. Correct answer: Option A As per NCERT Class 11 Chapter 2, dimensional analysis checks correctness and SI units define base and derived quantities. This principle confirms that 1.6% is correct because its dimensions and unit match the physical quantity asked.