The question types in the UPSC Preliminary exams typically consist of objective multiple-choice questions, whereas the Mains exams feature subjective essay-type questions. Preliminary exams assess breadth of knowledge with a factual basis, while Mains questions require deep analytical thinking and synthesis of information. The Mains stage includes questions that test a candidate's ability to articulate thoughts, derive conclusions, and apply learned concepts in real-world scenarios. This distinct variation emphasizes different skills necessary for both parts of the examination.