📝 Program structure in Virtual Memory

Q1. A system reserves a fixed 20 % of its memory for I/O buffers. When a running process causes a page fault and the free‑frame list is empty, which action should the operating system take first?

💡 Difficulty: easy | ✅ Correct: C

Q2. In a multitasking environment where many processes generate frequent page faults, which replacement strategy typically reduces thrashing the most?

💡 Difficulty: medium | ✅ Correct: C

Q3. If a system keeps a fixed 15 % of memory for I/O buffers and suddenly experiences heavy I/O activity, which policy would most effectively prevent excessive swapping of user processes?

💡 Difficulty: hard | ✅ Correct: B