Question

The length of one rod is `2.53 cm` and that of the other is `1.27 cm`. The least count of the measuring instrument is `0.01 cm`. If the two rods are put together end to end , find the combined length.

Answer 1

Length `l = 2.53 + 1.27 = 3.80 cm, Delta l = 0.01 + 0.01 = 0.02`
(Most probable errors of both the rods are added)
Hence true value `= ( 3.80 +- 0.02) cm`