The UPSC Preliminary Examination comprises a mix of objective-type questions that test a candidate's general awareness and aptitude. The two papers cover subjects such as Current Affairs, General Studies, and Logical Reasoning. Candidates can expect questions related to History, Geography, Polity, Economy, Environment, and General Science. Furthermore, the Preliminary exam also evaluates candidates' quantitative aptitude and comprehension skills through aptitude-driven questions. Thus, aspirants should be well-rounded in these subjects to perform effectively in the preliminary stage of the UPSC examination process.