📝 Hydra is an example of Capability Based Systems

📖 From Operating System • 14. Protection • 22 questions available

Practice MCQs for Hydra is an example of Capability Based Systems. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-27

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📝 Sample Questions

Q1. What is a lock in the lock–key mechanism?

🔹 A. A unique bit pattern attached to an object

🔹 B. A secret password stored by the OS

🔹 C. A hardware token

🔹 D. A network address

💡 Difficulty: easy | ✅ Correct: A

Q2. How does the lock–key mechanism compare to pure capability lists regarding revocation of access rights?

🔹 A. It revokes rights instantly by removing matching keys

🔹 B. It cannot revoke rights once granted

🔹 C. Revocation requires scanning all objects for the lock

🔹 D. Revocation is handled by the hardware

💡 Difficulty: medium | ✅ Correct: A

Q3. Explain why a global access table can be less efficient than a lock–key system when the system contains millions of objects and domains.

🔹 A. The table grows quadratically, leading to high memory and lookup cost

🔹 B. The table is stored on disk

🔹 C. The table uses compression

🔹 D. The table is encrypted

💡 Difficulty: hard | ✅ Correct: A

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🔗 Related Topics

📝 Goals of Protection in Operating System 📝 Principles of Protection in Operating System 📝 Domain of Protection in Operating System 📝 Domain structure for protection in Operating System 📝 UNIX example of protection in Operating System

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