Workshop Technology
The edge of a steel plate cut by oxygen cutting will get hardened when the carbon content is

More than 0.3 percent
Less than 0.1 percent
Less than 0.3 percent
Anywhere between 0.1 to 1 percent

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Workshop Technology
Piercing is an operation of cutting

A flat sheet to the desired shape
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 number of holes evenly spaced in a regular pattern on a sheet of metal

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