Which one of the following is a secondary sector economic activity in Karnataka?
India's steel industry can be broadly classified into the primary and secondary sectors. The primary sector contributes to the majority of steel production in the country and is characterized by fully integrated producers with ironmaking, steelmaking and rolling mills, where steelmaking is carried out in an EAF or BOF. The secondary sector, on the other hand, uses sponge iron and scrap to make steel in small induction furnaces (IF). The sector is set-up in clusters and the majority of IF producers procure their sponge iron feedstock from nearby manufacturers and pass on crude steel, mostly in the form of pencil billets, to re-rollers.