Question

The figure below shows part of a vernier caliper when the jaws are closed without an object between the jaws.
         

1. What is the value of the zero error of the calipers?
2. A student used the same vernier calipers in (a) above to measure the diameter of a test tube whose actual diameter is 2.15cm. What was the reading shown by the calipers

Answer 1

1. −0.02mm
2. 2.15=reading − error
   2–15=reading + 0.02
   Reading = 2.13mm