The chapter on Page 5 explains that secondary sector activities involve transforming outputs from the primary sector into goods. Examples given include processing grains to make flour, extracting oil from groundnuts, processing tea leaves, converting wood into furniture and paper, and using cotton to make clothes. The automobile manufacturing data on Page 6 shows production of passenger vehicles, commercial vehicles, three wheelers, and two wheelers as secondary sector activities. Students can identify additional examples like paper manufacturing, sugar production, cement manufacturing, etc.