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Computer Security and Viruses MCQs
Computer Security and Viruses MCQs are multiple-choice questions on threats to computers and data, including viruses, worms, Trojan horses, spyware, phishing and hacking, and the tools used to prevent them. Every question on MCQs360 shows the correct answer instantly, so you can learn the key terms quickly.
What should good passwords contain?
Correct answer B. Alphanumeric
What does the term heuristic checking refer to?
Correct answer B. Virus scanning
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What mechanism does a computer worm use to duplicate itself?
Correct answer B. Spawn
Which type of malicious program changes itself each time it is installed to avoid detection by antivirus software?
Correct answer A. Polymorphic virus
Which computer virus spread the most widely?
Correct answer B. ILOVEYOU
Brain, known as the first computer virus for MS-DOS, was written by two brothers from which country?
Correct answer D. Pakistan
Choose the best option: an antivirus program is designed to do what with a computer virus?
Correct answer C. Scan device, identify and eliminate
What are program modifications released by the software vendor called?
Correct answer D. Patches
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What are attempts by people to obtain your confidential information by faking their identity called?
Correct answer B. Phishing scams
From which language does the word virus come?
Correct answer A. Latin
What is the name for the process of encoding data and information into an unreadable form?
Correct answer C. Encryption
The Melissa virus, widely publicised in 1999, was what kind of virus?
Correct answer D. E-mail virus
Which computer virus holds the record for being the most widespread?
Correct answer C. I Love You
Which term refers to electronic trespassing or criminal hacking?
Correct answer C. Cracking
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What term describes any crime carried out through the use of computer technology?
Correct answer D. Computer crime
Which device should be used to prevent data loss during a power failure?
Correct answer A. UPS
What is the scrambling of code or data known as?
Correct answer A. Encryption
What is the hardware or software that protects a computer network from unauthorised access called?
Correct answer B. Firewall
Which tool is most commonly used to restrict access to a computer system?
Correct answer A. Passwords
About Computer Security and Viruses MCQs
Malware questions ask how viruses, worms, Trojan horses, logic bombs and time bombs differ, how each spreads and what damage it can do. Famous cases such as the Melissa virus of 1999 also appear, along with the origin of the word virus. Other questions cover cybercrime terms such as hacking, phishing, identity theft and password stealing, and protective measures such as strong passwords, antivirus software, encryption, patches, access controls and an uninterruptible power supply to prevent data loss. A few questions deal with the ethics of copying and sharing copyrighted software and files.
Key facts to remember
- A computer virus attaches itself to a host file or program and spreads when that file is run.
- A worm copies itself across networks without needing a host program.
- A Trojan horse appears to be useful software but carries out hidden harmful actions.
- Phishing is an attempt to obtain confidential information by pretending to be a trusted organisation.
- Encryption converts data into an unreadable form that can only be read with the correct key.
- The Melissa virus of 1999 was a macro virus that spread through email attachments.
Exams that include Computer Security and Viruses MCQs
Pakistan
- PPSC
- FPSC
- SPSC
- KPPSC
- NTS
- CSS
India
- SSC CGL
- IBPS PO
- IBPS Clerk
- SBI PO
- RRB NTPC
Bangladesh
- BCS
- Bangladesh Bank AD
- NTRCA
How to prepare for Computer Security and Viruses MCQs
- Make a comparison table of viruses, worms, Trojans, spyware and logic bombs showing how each spreads.
- Learn the cybercrime vocabulary, such as phishing, spoofing and hacking, with a one-line definition each.
- Link each threat to its main defence, for example antivirus software, firewalls, encryption or a UPS.
- Watch for best option wording, where more than one choice may sound partly correct.
Frequently asked questions
Which exams ask computer security MCQs?
Security and virus questions appear in the computer sections of PPSC, FPSC, NTS and KPPSC tests in Pakistan, in SSC, IBPS and SBI exams in India, and in BCS and bank recruitment tests in Bangladesh, especially for IT and banking posts.
What is the difference between a virus and a worm?
A virus needs a host file or program and spreads when that file is opened or run. A worm is a standalone program that copies itself across networks on its own, often by exploiting security weaknesses, so it can spread much faster without any user action.
How can I protect a computer from malware?
Keep the operating system and software updated, use reputable antivirus software, avoid opening unexpected attachments or links, and use strong, unique passwords. Regular backups and a firewall reduce the damage if an attack does get through.
Last reviewed October 2026