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📝 Computre Viruses

📖 From Operating System • 15. Security • 25 questions available

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

🔄 Last updated: 2026-07-27

6
Easy Questions
11
Medium Questions
8
Hard Questions

📝 Sample Questions

Q1. What defines a computer virus?

🔹 A. Self‑replicating code that attaches to legitimate programs and spreads to other systems
🔹 B. A program that modifies the BIOS to cause hardware failure
🔹 C. A network scanner that discovers open ports
🔹 D. An encryption tool used for data‑at‑rest protection

💡 Difficulty: easy | ✅ Correct: B

Q2. Why do Trojan horse programs often evade detection by traditional antivirus software?

🔹 A. They masquerade as trusted applications, blending with legitimate processes
🔹 B. They encrypt their payload using strong cryptography
🔹 C. They only activate during system boot
🔹 D. They delete system logs after execution

💡 Difficulty: medium | ✅ Correct: B

Q3. Which of the following best describes a polymorphic virus?

🔹 A. A virus that changes its code each infection to avoid signature detection
🔹 B. A virus that spreads only through email attachments
🔹 C. A virus that targets only mobile operating systems
🔹 D. A virus that self‑destructs after a single execution

💡 Difficulty: hard | ✅ Correct: B

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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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