The Operating System (OS) Question-Answer Book for Tripura University Diploma Students is structured to cover essential OS concepts across six modules. Module 1 introduces the basics of operating systems, including their definition, purpose, types, and evolution. Module 2 delves into Process Management and Memory Management, exploring process lifecycle, scheduling algorithms, and memory allocation techniques such as paging and segmentation. Module 3 focuses on File Management, discussing file systems, file operations, and disk scheduling. Module 4 covers the I/O System, explaining input/output devices, buffering, and I/O scheduling. Module 5 addresses OS Security, including access control, authentication, and protection mechanisms. The book concludes with Previous Year Question Paper Solutions, providing students with practical insights and preparation for exams, reinforcing both theoretical knowledge and problem-solving skills in alignment with the Tripura University syllabus.