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 i $s _____$ mm.
Options

Question

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 i s _____ mm.

G1 Physics · Accepted Answer

All measured readings are recorded up to two decimal places in millimetres. The smallest reported change in the last digit is therefore 0.01 mm. Hence the expected least count of the instrument is 0.01 mm. Correct option: A.