Computer Security MCQs with Answers 2026

1. A computer virus is:

a) A hardware problem    b) A malicious program that replicates and spreads ✅    c) A browser plugin    d) An operating system

2. Which malware disguises itself as legitimate software?

a) Virus    b) Worm    c) Trojan Horse ✅    d) Adware

3. Which malware spreads without user action through networks?

a) Virus    b) Trojan    c) Worm ✅    d) Spyware

4. Ransomware is malware that:

a) Speeds up computer    b) Encrypts files and demands payment to unlock ✅    c) Shows ads    d) Records keystrokes

5. A firewall is used to:

a) Increase speed    b) Monitor and filter network traffic ✅    c) Store backups    d) Compress files

6. Antivirus software is used to:

a) Speed up computer    b) Create documents    c) Detect, prevent, and remove malware ✅    d) Manage files

7. Encryption converts data into:

a) Deleted data    b) Compressed files    c) Coded format only authorized users can read ✅    d) Backup data

8. Phishing is:

a) A virus    b) Social engineering attack using fake emails/websites to steal info ✅    c) A firewall    d) Encryption

9. A DDoS attack aims to:

a) Steal passwords    b) Overwhelm a server with massive traffic ✅    c) Install malware    d) Encrypt files

10. Which attack records every keystroke?

a) Phishing    b) DDoS    c) Keylogger ✅    d) SQL Injection

11. SQL Injection targets:

a) Operating systems    b) Web application databases ✅    c) Hardware    d) Email servers

12. Two-factor authentication (2FA) provides:

a) Two passwords    b) Two different forms of verification ✅    c) Two firewalls    d) Two antivirus

13. A strong password should contain:

a) Only numbers    b) Only letters    c) Mix of uppercase, lowercase, numbers, special characters ✅    d) Your name

14. VPN stands for:

a) Virtual Personal Network    b) Virtual Private Network ✅    c) Verified Protection Network    d) Visual Processing Node