📝 Biometrics

📖 From Operating System • 15. Security • 10 questions available

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

🔄 Last updated: 2026-07-27

Easy Questions

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📝 Sample Questions

Q1. What is the definition of a macro virus?

🔹 A. A macro virus is written in a low‑level language such as assembly.

🔹 B. A macro virus is written in a high‑level language such as Visual Basic.

🔹 C. A macro virus replaces the original boot block at system start.

🔹 D. A macro virus encrypts its code to avoid detection.

💡 Difficulty: easy | ✅ Correct: B

Q2. Why do polymorphic viruses evade detection by antivirus software?

🔹 A. They change their signature each time they are installed.

🔹 B. They hide in memory above the new limit.

🔹 C. They modify the read system call to return original code.

🔹 D. They install themselves in the interrupt‑handler chain.

💡 Difficulty: medium | ✅ Correct: A

Q3. A boot‑sector virus copies the original boot sector to an unused location X before infecting a new removable R/W disk. Which action best describes this behavior?

🔹 A. It copies the boot sector to an unused location.

🔹 B. It overwrites the master boot record directly.

🔹 C. It installs itself in the interrupt‑handler chain.

🔹 D. It modifies the file‑system allocation table.

💡 Difficulty: hard | ✅ Correct: A

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🔗 Related Topics

📝 The Security Problem in Operating System 📝 Program Threats in Operating System 📝 Trojan horse 📝 Trap door 📝 Logic bomb

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