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Computer Security, Privacy and Ethics MCQs — Computer Science (page 2)

51 multiple-choice questions on Computer Security, Privacy and Ethics from Computer Science, each with the correct answer and, where available, a teacher's explanation. Read through them to revise the chapter, then practise the same questions one by one to test yourself.

26. Pakistan's main law against cybercrime is:

  1. HTTP Act
  2. PECA 2016
  3. RAID 2016
  4. SMTP 2010

Answer: B) PECA 2016

Explanation: Prevention of Electronic Crimes Act 2016.

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27. Gaining unauthorised access to someone's computer is:

  1. hacking
  2. formatting
  3. booting
  4. scanning

Answer: A) hacking

Explanation: Hacking is breaking into systems.

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28. Illegal copying and distribution of software is called:

  1. software piracy
  2. debugging
  3. open source
  4. software licensing

Answer: A) software piracy

Explanation: It violates copyright.

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29. Which is an ethical use of computers?

  1. Cyberbullying
  2. Reading others' emails without permission
  3. Using licensed software and citing sources
  4. Spreading fake news

Answer: C) Using licensed software and citing sources

Explanation: Respect for IP and honesty are ethical.

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30. A self-replicating program that spreads through networks without needing a host file is a:

  1. Trojan horse
  2. worm
  3. virus
  4. adware

Answer: B) worm

Explanation: Worms spread automatically.

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31. A computer virus:

  1. is a hardware fault
  2. attaches to files and replicates when the infected file is run
  3. spreads through the air
  4. improves computer speed

Answer: B) attaches to files and replicates when the infected file is run

Explanation: Viruses need a host program.

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32. The main difference between a virus and a worm is that a worm:

  1. is always harmless
  2. is a hardware device
  3. needs a host file to spread
  4. spreads by itself without a host program

Answer: D) spreads by itself without a host program

Explanation: Viruses need host files and user action.

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33. A virus that infects the start-up area of a disk is a:

  1. file virus
  2. macro virus
  3. boot sector virus
  4. browser hijacker

Answer: C) boot sector virus

Explanation: It loads when the computer boots.

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34. Moral principles that govern the proper use of computers are called:

  1. topologies
  2. computer ethics
  3. protocols
  4. computer hardware

Answer: B) computer ethics

Explanation: Ethics guide responsible behaviour.

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35. Polite and respectful behaviour on the Internet is called:

  1. spamming
  2. hacking
  3. phishing
  4. netiquette

Answer: D) netiquette

Explanation: Net + etiquette.

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36. Using someone's personal information to impersonate them is:

  1. spamming
  2. netiquette
  3. authorization
  4. identity theft

Answer: D) identity theft

Explanation: Criminals may open accounts in the victim's name.

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37. Using an ATM card with a PIN is an example of:

  1. two-factor authentication
  2. biometrics only
  3. authorization only
  4. single-factor authentication

Answer: A) two-factor authentication

Explanation: Card (have) + PIN (know).

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38. A virus that changes its code each time to avoid detection is:

  1. macro
  2. polymorphic
  3. boot sector
  4. resident

Answer: B) polymorphic

Explanation: Poly = many forms.

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39. A virus that infects Word and Excel documents is a:

  1. worm
  2. boot sector virus
  3. rootkit
  4. macro virus

Answer: D) macro virus

Explanation: It uses the macro language of the application.

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40. Which malware does NOT replicate itself?

  1. Polymorphic virus
  2. Virus
  3. Worm
  4. Trojan horse

Answer: D) Trojan horse

Explanation: Trojans rely on users installing them.

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41. An OTP sent to your mobile phone represents:

  1. a firewall
  2. something you know
  3. something you are
  4. something you have

Answer: D) something you have

Explanation: Possession factor – your phone.

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42. The "Brain" virus (1986), considered the first PC virus, was created in:

  1. Tokyo, Japan
  2. New York, USA
  3. Lahore, Pakistan
  4. London, UK

Answer: C) Lahore, Pakistan

Explanation: It was written by the Alvi brothers in Lahore.

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43. Which comes first?

  1. Authentication
  2. Authorization
  3. Both at random
  4. Neither is needed

Answer: A) Authentication

Explanation: Identity must be verified before permissions are granted.

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44. A password or PIN is an authentication factor of type:

  1. something you are
  2. somewhere you are
  3. something you know
  4. something you have

Answer: C) something you know

Explanation: Knowledge factor.

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45. Malware stands for:

  1. multiple wares
  2. main hardware
  3. manual software
  4. malicious software

Answer: D) malicious software

Explanation: Software designed to cause harm.

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46. Which is a common symptom of malware infection?

  1. The keyboard becomes louder
  2. The computer becomes unusually slow and shows many pop-ups
  3. The screen becomes brighter
  4. RAM size increases

Answer: B) The computer becomes unusually slow and shows many pop-ups

Explanation: Malware consumes resources and shows ads.

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47. The best protection against malware includes:

  1. disabling the firewall
  2. updated antivirus, OS updates and careful downloading
  3. opening all attachments
  4. using the same password everywhere

Answer: B) updated antivirus, OS updates and careful downloading

Explanation: Layered precautions reduce risk.

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48. WannaCry (2017) was an example of:

  1. a firewall
  2. adware
  3. ransomware
  4. a boot sector virus only

Answer: C) ransomware

Explanation: It encrypted files and demanded Bitcoin.

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49. Using an infected USB flash drive can:

  1. spread malware to your computer
  2. clean all viruses
  3. update the BIOS
  4. increase CPU speed

Answer: A) spread malware to your computer

Explanation: Removable media carry infections.

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50. A virus that infects both the boot sector and program files is:

  1. macro
  2. polymorphic
  3. multipartite
  4. stealth

Answer: C) multipartite

Explanation: It has multiple parts of attack.

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