In an experiment, a set of reading are obtained -1.24 mm , 1.25 mm , 1.23 mm , 1.21 mm . The expected least count of the instrument used in recording these readings is \ \ \ \ mm.

Physics · Units, Dimensions & Error Analysis

JEE Main 2026 — 28 January, Evening Shift — Question 32

In an experiment, a set of reading are obtained $-1.24 \mathrm{~mm}, 1.25 \mathrm{~mm}, 1.23 \mathrm{~mm}, 1.21 \mathrm{~mm}$ . The expected least count of the instrument used in recording these readings is $\_\_\_\_$ mm.

Option A:
0.01
Correct
Option B:
0.001
Option C:
0.1
Option D:
0.05

Answer: A

Step-by-step solution

Least count will be 0.01 mm .

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Exam: JEE Main 2026
Paper: 28 January, Evening Shift
Subject: Physics
Chapter: Units, Dimensions & Error Analysis
Topic: Significant Figures and Error Analysis

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