Workshop Technology
Piercing is an operation of cutting

A number of holes evenly spaced in a regular pattern on a sheet of metal
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

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Workshop Technology
A progressive limit gauge has

'Go' member at one end and 'Not go' member at the other end
'Go' and 'Not go' member on the same side of the gauge
None of the listed here
Separate 'Go' and 'Not go' members

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