Chapter 3: Computer Virus
Section A: Multiple Choice Questions (30 Marks)
1. What does the acronym VIRUS stand for?
2. Which type of virus infects the Master Boot Record (MBR) and becomes active when the system starts?
3. Program File viruses target files with extensions such as:
4. A hybrid virus that infects both the boot sector and executable program files is called a:
5. Which virus infects documents created in applications like Word, Excel, and PowerPoint that support automation macros?
6. A polymorphic virus is known for its ability to:
7. The key difference between a computer worm and a virus is that a worm:
8. Which malicious program tricks users by appearing as useful software at first glance but damages the system once installed?
9. Malicious software that secretly monitors browsing habits, passwords, and user activities without knowledge is:
10. Which fake program looks like an antivirus software and scares users into thinking their system is infected?
11. The background scanning process in an antivirus that checks files continuously whenever opened or saved is called:
12. Isolating an infected file by an antivirus so it cannot affect the system is known as:
13. What feature automatically launches installers and programs when a flash drive or CD is inserted?
14. The term 'Malware' is made up of which two words?
15. What system utility controls incoming and outgoing network traffic to prevent unauthorized access?
16. Which historical virus was first detected on ARPANET in the early 1970s?
17. Which boot sector virus created in 1986 is recognized as the first PC virus?
18. Which famous worm released on November 2, 1988 was among the first distributed over the internet?
19. Why is regular updating of antivirus database files essential?
20. Network viruses rapidly spread through:
21. Rashmi inserted a friend's pen drive into her computer and found her files unreadable next day. What precaution did she skip?
22. Which symptom indicates that a computer system might be virus affected?
23. An antivirus program contains two main components: scan engine and:
24. Which of the following is NOT a genuine antivirus software?
25. Stealth viruses are difficult for antivirus software to detect because they:
26. Which destructive virus is considered to have caused an estimated financial damage of $52.2 billion?
27. Trojan horses do not reproduce by infecting other files; instead they can create a:
28. How often is it recommended to scan your computer hard disk as a preventive measure?
29. Which safety tip should be followed when dealing with email attachments?
30. Can Android phones get infected by viruses?
Section B: Assertion & Reason Questions (30 Marks)
Directions: Choose the correct option for each question:
- A: Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
- B: Both Assertion (A) and Reason (R) are true, but Reason (R) is NOT the correct explanation of Assertion (A).
- C: Assertion (A) is true, but Reason (R) is false.
- D: Assertion (A) is false, but Reason (R) is true.
31. Assertion (A): Updating antivirus software frequently helps protect the system against new virus threats.
Reason (R): Antivirus updates refresh the virus database with list of file patterns used to identify newly developed viruses.
32. Assertion (A): Computer worms require human action to travel and spread to other computers.
Reason (R): Worms are self-replicating programs that have the capability to spread without any human intervention.
33. Assertion (A): Trojan Horses appear at first glance to be useful software.
Reason (R): They trick users into opening or installing them, causing damage once installed.
34. Assertion (A): Boot sector viruses infect the first sector of a hard drive carrying the Master Boot Record (MBR).
Reason (R): Boot sector viruses become active at the time of booting the machine.
35. Assertion (A): Sweeper is a genuine antivirus program recommended for system cleanup.
Reason (R): Sweeper is a form of virus coming from malicious websites that looks like an antivirus program.
36. Assertion (A): Real-time scan runs continuously in the background of an antivirus.
Reason (R): It provides maximum protection by scanning opened or saved files and displaying security risk alerts.
37. Assertion (A): Macro viruses infect executable files ending in .exe and .com.
Reason (R): Macro viruses infect files created using application software that support Macros, like Word and Excel.
38. Assertion (A): Simply installing an antivirus software once guarantees 100% protection forever.
Reason (R): Installed antivirus software may not be able to detect any new virus programs unless frequently updated.
39. Assertion (A): Spyware monitors user activity without their knowledge.
Reason (R): Spyware collects personal information like surfing habits and passwords, transmitting it in the background.
40. Assertion (A): Quarantining a virus means deleting the file completely from the hard drive.
Reason (R): Quarantining isolates the virus so that it cannot affect the rest of the system.
41. Assertion (A): Disabling AutoRun on flash drives helps prevent automatic virus infections.
Reason (R): AutoRun automatically launches programs and installers as soon as a flash drive is inserted.
42. Assertion (A): Polymorphic viruses change their binary pattern every time they infect a file.
Reason (R): Changing binary patterns helps polymorphic viruses avoid detection by antivirus programs.
43. Assertion (A): A computer virus can make your physical screen crack like broken glass.
Reason (R): Viruses are software programs that disrupt software operations, memory, and data, not physical glass hardware.
44. Assertion (A): Installing a firewall is recommended to prevent virus and security attacks.
Reason (R): A firewall controls the incoming and outgoing network traffic on your system.
45. Assertion (A): A multipartite virus is classified as a hybrid virus.
Reason (R): It combines characteristics of both a Boot Sector virus and a Program File virus.
46. Assertion (A): Downloading pirated software from the internet is completely safe from virus infections.
Reason (R): Downloading pirated software can install malicious code, adware, or trojans onto your system.
47. Assertion (A): Network viruses multiply through shared resources like shared drives and folders.
Reason (R): When a network virus infects a computer, it searches through the network to attack new potential targets.
48. Assertion (A): Taking frequent backups of files is recommended for data safety.
Reason (R): Backups ensure that if data is lost or damaged due to a virus attack, original copies can be restored.
49. Assertion (A): Antivirus software should be turned off when making the computer work faster.
Reason (R): Turning off antivirus software removes protection and leaves the system vulnerable to virus attacks.
50. Assertion (A): Trojan Horses self-replicate rapidly across files just like worms.
Reason (R): Unlike viruses and worms, Trojans do not reproduce by infecting other files nor do they self-replicate.
51. Assertion (A): The scan engine in an antivirus compares files with pattern files in the virus database.
Reason (R): Matching file patterns with known virus signatures verifies whether a file is infected.
52. Assertion (A): Malware is a generic term used only for useful system utility programs.
Reason (R): Malware is a generic term for malicious software that enters and damages a computer without user knowledge.
53. Assertion (A): Unexpected error messages and distorted menus indicate a virus affected system.
Reason (R): Virus infection disrupts normal system functioning and causes application malfunctioning.
54. Assertion (A): Email attachments ending with .exe should be opened directly without caution.
Reason (R): Executable file attachments in emails can contain viruses and mislead recipients into executing malware.
55. Assertion (A): Antivirus companies provide facilities to download latest updates from their websites.
Reason (R): Updating software ensures the system is armed and prepared against all latest virus threats.
56. Assertion (A): Computer worms often cause heavy consumption of system memory or network bandwidth.
Reason (R): The self-replicating nature of worms causes servers and individual computers to stop responding.
57. Assertion (A): Almost all viruses exist attached to executable files.
Reason (R): A virus will not infect the computer unless you run or open the malicious executable program.
58. Assertion (A): Always scanning a pen drive before using it prevents virus transmission.
Reason (R): Flash drives are a very common source through which infected data spreads between computers.
59. Assertion (A): The name Trojan Horse was derived from the wooden horse used by the Greek Army to conquer Troy.
Reason (R): Trojan Horse software appears useful at first glance, but damages the computer once installed.
60. Assertion (A): Protecting your computer and files from virus threat is a continuous on-going activity.
Reason (R): New viruses are constantly created, requiring continuous vigilance and updated software.
Section C: Image & Visual Feature Based Questions (10 Marks)
61. Identify the AVG Antivirus software interface step:
AVG Main Window ➔ [ Run Smart Scan ] button.
What happens when the user clicks 'Run Smart Scan'?
62. Observe the pop-up notification visual upon plugging in a flash drive:
External drive connected ➔ [ Scan for Threats ]
Which action should be taken when this prompt appears?
63. Identify the process sequence flowchart:
Virus Enters ➔ Virus Activates ➔ User Detects Problem ➔ Runs Antivirus ➔ System Restored
What action should be taken at the 'User Detects Problem' stage (noticing slow speed or crashes)?
64. Scenario Visual: Mohit receives security alert pop-ups displaying a list of fake malware files prompting him to buy software. What fake antivirus threat is displaying these fake alerts?
65. Look at the antivirus action options after scanning:
Virus Found: [ Delete ] | [ Quarantine ]
What does selecting 'Quarantine' do?
66. Scenario Visual: Rashmi opens an infected Word document containing step-by-step automated actions. Which type of virus gets loaded into main memory when this document opens?
67. Identify the classification category diagram:
Malware ➔ [ Worms | Trojans | Spyware | Sweeper ]
Which type specifically snoops chat programs, scans hard drives, and transmits surfing habits to third parties?
68. Scenario Visual: Mohit notices his computer cursor moving all by itself and windows opening and closing randomly. What does this symptom indicate?
69. Look at the email attachment visual:
From: Unknown Sender
Attachment: PrizeWin.exe
What is the proper precautionary step?
70. Identify the component description:
"A security software mechanism installed on a system to control incoming and outgoing network traffic." What is it?
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