Q 11-01-069JEE MainJEE Main 2026 (28 Jan, Shift 2)Easy
In an experiment, a set of reading are obtained as follows - 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.
Answer: (A) 0.01
Each reading is recorded to the second decimal place in mm and the readings differ in steps of 0.01 mm (e.g. 1.24, 1.25, 1.23, 1.21). The smallest division the instrument can read is therefore $0.01$ mm.
Solution by Sreeraj P, M.Sc Physics