📝 Working set model of thrashing

📖 From Operating System • 9. Virtual Memory • 11 questions available

Practice MCQs for Working set model of thrashing. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-26

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📝 Sample Questions

Q1. What condition triggers a page fault in a paging system?

🔹 A. Access to a page that is already resident in memory

🔹 B. Access to a page whose invalid bit is set

🔹 C. Access to a read‑only page while writing

🔹 D. Access to a page that has been swapped out but is still marked valid

💡 Difficulty: easy | ✅ Correct: B

Q2. How does pure demand paging affect the total number of page faults compared with a pre‑paging strategy?

🔹 A. It always reduces the total faults

🔹 B. It increases faults at startup but may lower overall faults

🔹 C. It eliminates all faults after the first instruction

🔹 D. It causes the same number of faults as pre‑paging

💡 Difficulty: medium | ✅ Correct: B

Q3. In the working‑set model, how does the size of a process’s working set influence the choice of page‑replacement algorithm?

🔹 A. Larger working sets favor FIFO

🔹 B. Smaller working sets require NRU

🔹 C. Algorithms that preserve recent references are preferred for larger working sets

🔹 D. Working‑set size has no impact on algorithm selection

💡 Difficulty: hard | ✅ Correct: C

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🔗 Related Topics

📝 Basic concepts of Demand Paging 📝 Performance of demand paging 📝 Copy on Write in virtual Memory 📝 Basic page replacement in virtual Memory 📝 FIFO page replacement

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