Workshop Technology
The instrument used to measure external and internal diameter of shafts, thickness of parts and depth of holes, is

Inside micrometer
Outside micrometer
Vernier caliper
Depth gauge micrometer

ANSWER DOWNLOAD EXAMIANS APP

Workshop Technology
Piercing is an operation of cutting

A cylindrical hole in a sheet of metal by the punch and the die
A hole (other than cylindrical) in a sheet of metal by the punch and the die
A flat sheet to the desired shape
A number of holes evenly spaced in a regular pattern on a sheet of metal

ANSWER DOWNLOAD EXAMIANS APP