Question

Thickness of a metallic sheet is measured using a screw gauge and readings are 0.842 cm,
0.865 cm, 0.908 cm, 0.892 cm and 0.837 cm. Find the mean value of thickness, mean absolute
error and percentage error.

Answer 1

Answer:

Main scale reading M.S.R.=2 mm

Coinciding division n=57

Least count of screw gauge L.C.=0.01 mm

Thickness of wire t=M.S.R.+n×L.C.=2+57×0.01=2.57 mm

Answer 2

Answer:

The thickness of plate was measured by micrometer screw gauge of readings 2.431 cm , 2.440 cm, 2.438 cm. calculate percentage error in the measurement of thickness of plate *