UPSC Combined Geo-Scientist (Preliminary) Examination 2026 - Vacancy Details, Notification, and Online Application link: The Union Public Service Commission (UPSC) conducts the Combined Geo-Scientist Examination every year to select candidates for the posts of Geologist, Geophysicist, Chemist, Scientist 'B', Asst. Hydrogeology, Asst. Chemist, and Asst. Geophysicist in the Geological Sur...