📝 Securing passwords

📖 From Operating System • 15. Security • 13 questions available

Practice MCQs for Securing passwords. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-27

Easy Questions

Medium Questions

Hard Questions

Q1. What is the definition of a polymorphic virus?

🔹 A. A virus that encrypts its code before execution

🔹 B. A virus that changes its signature each time it infects a system

🔹 C. A virus that only infects macro-enabled documents

🔹 D. A virus that replaces the boot sector with its own code

💡 Difficulty: easy | ✅ Correct: A

Q2. Why do encrypted viruses include decryption routines alongside encrypted payloads?

🔹 A. To hide the payload from static analysis tools

🔹 B. To increase the speed of infection

🔹 C. To allow the virus to modify user passwords

🔹 D. To bypass network firewalls

💡 Difficulty: medium | ✅ Correct: B

Q3. Why does a boot‑sector virus replace the original boot block at system start‑up?

🔹 A. To increase the computer's processing speed

🔹 B. To ensure the virus loads before the operating system, gaining control early in the boot process

🔹 C. To delete all user files immediately

🔹 D. To encrypt network traffic

💡 Difficulty: hard | ✅ Correct: A

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