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📝 LOOK scheduling in Disk Scheduling

📖 From Operating System • 10. Mass Storage Structure • 8 questions available

Practice MCQs for LOOK scheduling in Disk Scheduling. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-26

2
Easy Questions
4
Medium Questions
2
Hard Questions

📝 Sample Questions

Q1. What is the primary behavior of the LOOK disk scheduling algorithm?

🔹 A. Moves the disk arm to the outermost cylinder regardless of pending requests
🔹 B. Scans only as far as the furthest request in each direction before reversing
🔹 C. Always services requests in the order they arrive
🔹 D. Jumps directly to the next request without moving the arm

💡 Difficulty: easy | ✅ Correct: B

Q2. Why does LOOK typically result in lower average seek time than SCAN?

🔹 A. Because LOOK skips idle cylinders, reducing unnecessary movement
🔹 B. Because LOOK prioritizes read requests over write
🔹 C. Because LOOK uses a random selection of pending requests
🔹 D. Because LOOK always starts from the innermost cylinder

💡 Difficulty: medium | ✅ Correct: A

Q3. A disk head starts at cylinder 50. The pending requests are at 10, 22, 20, 38, 40, and 5. What is the total seek distance for LOOK compared to FCFS?

🔹 A. LOOK 45 cylinders, FCFS 109 cylinders (difference 64)
🔹 B. LOOK 70 cylinders, FCFS 109 cylinders (difference 39)
🔹 C. LOOK 45 cylinders, FCFS 95 cylinders (difference 50)
🔹 D. LOOK 60 cylinders, FCFS 120 cylinders (difference 60)

💡 Difficulty: hard | ✅ Correct: A

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🔗 Related Topics

📝 Magnetic disks📝 Solid state disks📝 Magnetic tapes📝 Disk Structure📝 Host attached storage
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