Workshop Technology
Thermit, used in Thermit welding, is a mixture of

Charcoal and iron oxide
Charcoal and aluminium
Iron oxide and aluminium
Charcoal, iron oxide and aluminium

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Workshop Technology
Notching is the operation of

Cutting a sheet of metal through part of its length and then bending the cut portion
Bending a sheet of metal along a curved axis
Removal of metal to the desired shape from the edge of a plate
Cutting a sheet of metal in a straight line along the length

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