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

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

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Workshop Technology
In permanent mould casting method

Molten metal is forced into mould under high pressure
None of these
Molten metal is poured in a metallic mould, retained in the mould long enough for the outer skin to solidify and finally mould is turned over to remove molten metal still in molten condition
Molten metal is poured and allowed to solidify while the mould is revolving

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