Computer Virus [130 OBJECTIVES MCQ AND QUESTIONS N ANSWERS]

Computer Virus

130 Questions Collections

15 Theory Questions

1.   What is computer virus?

2.   List the types of computer virus?

3.   What is boot sector virus? How can a boot sector virus harm the computer?

4.   What is file infector virus?

5.   What is multipartite virus?

6.   What is stealth virus?

7.   What is macro virus?

8.   List any four symptoms of computer virus.

9.   Give any four important points to keep our computer safe form virus.

10.List four ways how virus spread into the computer.

11.What is antivirus software? Give any four examples of antivirus software.

12.Who developed C-Brain Virus? What was the purpose of developing it?

13.   List any four reasons for creating computer viruses.

14.Define computer worm and Trojan horse.

15.What is script virus?

1)     What is computer virus?
Ans: Computer virus is a program written by the programmer with the intention of destroying and damaging the data and programs residing in the computer system.

2)     Write down the purpose of creating computer virus.
Ans: The purpose of creating computer virus are:
i) To stop computer piracy
ii) To entertain user by displaying interesting message and pictures
iii) To destroy data, information and files
iv) To expose the programmers ability
v) To earn money

3)     How does a computer virus spread from one computer to another?
Ans: A virus spreads from one computer to another by:
i) Sharing infected internal portable disk like floppy disk, pen drive, CDs, etc.
ii) Opening a virus infected email, messages and attached files
iii) Downloading files and programs form the websites which are not secure
iv) Exchanging data and information over a network

4)     What are the symptoms of computer virus?
Ans: The symptoms of computer virus are:
i) Program take long time to load.
ii) The floppy disk or hard disk is suddenly accessed without a logical reason.
iii) Increased use of disk space and growth in file size.
iv) Corrupting the system data.
v) Renaming files with different names.

5)     Write down the effects of computer virus.
Ans: The effects of computer virus are:
i) Virus can change the contents of file, and codes of program.
ii) Degrade the overall performance of computer system.
iii) Change in size of file by adding or removing text accordingly.

6)     Write some preventive ways to protect computer system form virus.
Ans: Some preventive measures are:
i) Write protect your floppy disks when using them on other computers.
ii) Scan the mail or unknown files of internet before opening in your computers.
iii) Use a good antivirus program to scan floppy disk, CD, etc. before copying.
iv) Don’t install pirated software, especially computer games.
v) Don’t interchange the internal disk among the computers.
vi) Don’t use free distributed software.

7)     Write down the types of viruses.
Ans: The types of viruses are:
i) Boot sector virus
ii) File infector virus
iii) Multipartite virus
iv) Stealth virus
v) Macro virus

8)     What is antivirus software?
Ans: Antivirus software is software designed to detect and remove virus from computer system o ensure virus free environment.

9)     Write down any four examples of virus.
Ans: Any four examples of viruses are:
i) Disk killer ii) Flip  iii) Frodo          iv) Word concept

10)  Write any four examples of antivirus software.
Ans: Four examples of antivirus software are:
i) Kaspersky ii) NOD32        iii) Norton antivirus       iv) McAfee

11)  What is boot sector virus?
Ans: The virus which destroys or infects the boot sector of the disk where master boot record is stored is called boot sector virus.

12)  How can boot sector virus harm a PC?
Ans: The boot sector virus modifies the Master Boot Record (MBR) that prevents the computer system from being able to boot or start up the computer from system disk.

13)  What is program or file virus?
Ans: The virus that infects the executable program file having extension .exe, .bin, .sys, .com, etc. is called program virus.

14)  What is stealth virus?
Ans: The virus that infects the program files and boot records which rarely gives the information about its presence is called stealth virus.

15)  What is multipartite virus?
Ans: The virus which infects both application program and boot sector of a disk is called multipartite virus.

16)  What is Macro virus?
Ans: The virus that infects the software document or template created using word processing or spread sheet software is called macro virus.

17)  What is Master Boot Record (MBR)?
Ans: MBR is a small program which is responsible for booting computer system.

18)  What is computer worm?
Ans: A computer worm is a malicious program that does not hide in other files but operates entirely on its own.

19)  What is Trojan horse?
Ans: Trojan horse is a destructive program that disguises as a game or a utility or an application program, which pretends to be something interesting and harmless.

20 Technical Terms

1. A software program with the ability to generate multiple copies itself.

2.      A program that destroys other program.

3.      A computer program that entertains and damages the user’s file.

4.      A program that effect the normal functioning of computer.

5.      A virus that infects the part of the computer called a system sector.

6. A virus infects or substitutes its own code for either the DOS boot sector or the master boot record (MBR)
7. A small program that runs every time the computer starts up

8.      A type of virus that infects executable files having .exe, .com, .ovl, .drv, .sys, or .dil.

9.      A virus that affects application programs.

10.   A virus that corrupts system files of operating system.

11. A virus that shows different behavior in each infection.

12.   A complicated virus that affects data types and functions. It is a self encrypted virus designed to avoid detection by a scanner.

13. A code that mutates while keeping the original algorithm intact.
14. A series of commands and actions that help to automate some task

15.   A computer virus that damages the documents created in MS-Word & MS-Excel.

16.   A virus that infects both boot sector of a disk and program files.

17.   A file virus, that uses special technique to hide its presence from users and virus scanners.

18.   A class of program that searches your hard drive and floppy disks for any known or potential viruses.

19.   A program that can disinfect a file from virus.

20.   Software that do not come from reliable sources.

Answers:

1. Computer Virus	2. Computer Virus	3. Computer Virus	4. Computer Virus	5. Boot Sector Virus
6. Boot Sector Virus	7. MBR	8. Program Virus	9. Program Virus	10. File Infector Virus
11. Polymorphic Virus	12. Polymorphic Virus	13. Polymorphic Code	14. Macro Virus	15. Macro Virus
16. Multipartite Virus	17. Stealth Virus	18. Antivirus Software	19. Antivirus Software	20. Pirated Software

30 Multiple Choice Questions

1.      Computer virus are known as

i. computer programs             ii. biological problems       iii. hardware components       iv. None of the above

2.      Computer virus is___________software.

i. Malware                   ii. Utility                             iii. Application   iv. Operating System

3.      Computer virus can

i. Hide in a host file                  ii. Replicate                        iii. Spread                          iv. All of the above.

4.      Which is not a virus?

i. Worm                       ii. Logic bomb                    iii. Trojan Horse iv. Win-zip

5.      Which one is not a type of virus?

i) Message Carrying virus       ii) Boot sector virus          iii)System virus  iv)Special Purpose Application Infector

6.      Computer virus can destroy

i. Hardware                         ii. Software                  iii. Data                                iv. All

7.      Virus is a

i. Utility program       ii. Destructive program   iii. System program            iv. None

8.      Route of virus transmission.

Mouse                          Print                      Microphone                       Pen drive

9.      What is the route of virus transmission?
i. Monitor     ii. Flash drive      iii. Mouse                           iv. Cable

10.   Computer virus can spread from one computer to another through_

i. Infected portable disk           ii. The Internet                   iii. Pirated software           iv. All of the above.

11.   Which of the following is not anti-virus

i.AVG                                  ii.NAV                      iii, Kaspersky                      iv. I Love you

12.   An example of antivirus software is

i. NAV   ii. McAfee   iii. CPAV              iv. All

13.   Which of the following is an anti-virus program?
        i) NAV                 ii) Windows        iii) Photoshop     iv) All of the above

14.   Which is antivirus software?

i. Scan                          ii. Defrag              iii. Kaspersky                     iv. Power point

15.   Norton antivirus, when loaded onto a computer system , checks the following areas for viruses         

boot record                 programs at the time you use them                                             both

16.   A program or set of programs designed to prevent, search for, detect, and remove software viruses, and other malicious software like worms, Trojans, adware and more.

i)Shareware                     ii)Freeware                          ii)Antivirus

17.   ________ Virus are often transmitted by a floppy disk left in the floppy disk drive.

Boot-sector                 Trojan horse                       Script                    logic bomb

18.   Boot sector virus infects

i. System files                            ii. Master boot record        iii. Application software    iv. Document file

19.   A type of virus that infects the first sector, i.e. the boot sector, of a floppy disk or hard drive.

i) Boot sector virus            ii) File infecting virus             iii) Polymorphic virus                     iv) None of the above

20.   Disk Killer, stoned and Michelangelo are examples of ________________

i) Boot sector virus            ii) File infecting virus             iii) Polymorphic virus                     iv) All of the above

21.   A virus that infects the part of the computer called a system sector.

i. Boot sector virus              ii. File infecting Virus           iii. Polymorphic virus              iv. None of the above

22.   __________infects or substitutes its own code for either the DOS boot sector or the master boot record.(MBR)

i. Boot sector virus                   ii. file infecting virus                       iii. polymorphic virus

23.   Which of the following virus infects the various parts of operating system?

i. boot sector                        ii. Worm                    iii. Macro                             iv. system infector

24.   __________ Virus can infect both programs and boot sectors.

Stealth virus                              File infectors                      Multipartite virus                      Polymorphic virus

25.   Viruses attach themselves to documents such as Word and Excel.

Macro virus                File infectors                                     Polymorphic virus           

26.   A type of virus that replaces a macro , which is what enables a program to work and instigates a designated group of actions and commands.

i)Macro virus                         ii)File infecting virus                       iii)Polymorphic virus

27.   A type of virus that infects executable files having .exe, .com, .ovl, .drv, .sys, or .dil.

i) Boot sector virus                     ii) File infecting                              iii) Script virus                                         iv) Macro virus

28.   A virus that can change its appearance with every infection is called_____________

i) Boot virus               ii) Micro virus                   iii) Script virus                                    iv) None of them

29.                                 is a self-encrypted virus designed to avoid detection by a scanner.

i. Polymorphic virus                 ii. Macro virus    iii. Script virus    iv. None of the above

30.   Multipartite viruses have combination features of

i. Boot sector & stealth virus           ii. Boot sector &macro  virus               iii. Boot sector & program virus      iv. None

Answers:

1. Computer Programs	2. Malware	3. All of the above	4. Win-zip	5. Special Purpose Application Infector
6. Data	7.Destructive Program	8. Pen Drive	9. Flash Drive	10. All of the above
11.I Love You	12. All	13. NAV	14. Kaspersky	15. Both
16. Antivirus	17. Boot Sector	18. Master Boot Record	19. Boot Sector Virus	20. Boot Sector Virus
21. Boot Sector Virus	22.Boot Sector Virus	23.System Infector	24.Multipartite Virus	25. Maccro Virus
26.Macro Virus	27.File infecting	28.None of them	29.Polymorphic Virus	30.Boot Sector & program virus

35 True and False Questions

1.      A computer virus can cause actual damage or destruction to the hardware components of a computer system.

2.      Virus spreads across disks and networks by making copies of itself.

3.      Computer viruses used to be a developed unknowingly while developing computer program.

4. Viruses are easily identified as other programs.
5. Viruses mostly spread through computer network.

6.      Viruses change the size of file and memory.

7.      Computer virus deletes unnecessary data, information and programs of a computer.

8.      Computer virus is visible like other files and programs.

9.      Computer viruses are created to stop the software piracy.

10.   Computer viruses hide themselves in host files.

11.   Computer virus may damage or corrupt data, change data, degrade the performance of your system by utilizing resources such as a disk.

12.   Computer virus decreases the space in the main memory and increase the size of the executable files.

13.   A computer virus needs another program in order to be able to be activated and infect other computer files.

14.   Computer viruses usually spread in one of three ways: from removable media; from downloads off the Internet; and from e-mail attachments.

15.   A virus is a useful program that help a user to perform some specific task.

16.   Each computer virus contains instructions to initiate a unique, problematic event on the infected computer.

17.   Computer viruses cannot delete files and format a user’s hard disk.

18.   Pirated software copies viruses, to the computer.

19.   Do not install pirated software, especially computer games.

20.   Viruses can easily hide within a system by attaching themselves to other files or program because they are small in size.

21.   Usually system infectors enter to the system as a device driver and get loaded into memory.

22. Script viruses attach themselves to any executable file, usually .COM, .BIN, EXE etc.
23. A macro virus infects both the application program and the boot sector of disk.

24.   Macro viruses infect files created in Microsoft application software like MS-Word, MS-Excel, etc.

25.   A virus that can change it’s appearance with every infection is called macro virus.

26.   Stealth virus is a file virus that uses special technique to hide its presence from user and virus scanners.

27.   Stealth virus is a computer virus that uses various mechanisms to avoid detection by antivirus software.

28.   A files infecting virus activated only when you turn or a restart your computer.

29.   A macro virus is a computer virus that replace a macro, which is what enables a programs to work and instigates a designated group of action and commands.

30.   An anti-virus program having old virus definition file can effectively detect the latest virus.

31.   All anti-virus program can detect and eliminate all types of viruses.

32.   Antivirus software must perform algorithms scanning to detect script virus.

33.   Multi-partite virus can infect both the boot sector of the disk and executable file.

34.   Boot sector virus infects or substitutes it’s own code for either the DOS boot sector or the Master boot record(MBR).

35.   Freeware software is a program designed to detect and remove viruses from the computer system.

Answers:

1. False	2. True	3. False	4. False	5.True
6. True	7.False	8. False	9. True	10. True
11. True	12. True	13. True	14. True	15. False
16. True	17. False	18. True	19. True	20. True
21. True	22.False	23.False	24. True	25.False
26. True	27. True	28.False	29. True	30.False
31.False	32.False	33. True	34. True	35.False

25 Fill in the Blanks

1.      The first person who introduced the concept of replicating program was______________.

2.      A___________________ virus is a type of computer virus that infects the word processing or spread sheet document or template.

3.        _______________ Is a program that spreads by first infecting files or the system areas of a computer or network router’s hard drive and then making copies of itself.

4.      _______________  is a program that can copy itself and infect a computer without the permission or knowledge of the user.

5.      A computer virus is a type of program that_____________itself by making copies of itself without your knowledge or consent.   

6.      The capability of generating the copies of itself is called ________________________

7.      _______________ software is a class of program that searches your hard drive and floppy disks for any known or potential viruses.

8.      _________ are used to detect and remove computer virus from infected file or memory.

9.      ________________ virus  normally infects computer programs searching the extensions like .com, .exe, .ovl etc

10.   __________________ viruses usually do not destruct the computer files/programs but display interesting information to entertain the users.

11.    ______ is a program containing code that can generate multiple copies of itself.

12.   ___________ are software programs or hardware devices designed to keep computers safe from hackers.

13.   A program designed to protect software from viruses is called _________

14.   A  _______________ is an area of the computer hard drive or a floppy disk that is executed when the computer is started.

15.   We should ____________Latest and updated antivirus in our computer.

16.File infector virus affect ______________ file.

17.A malicious program that pretends to be something useful program is known as __________.

18.A program that is not a virus but behave like virus and can replicate is known as __________.

19.   ______________viruses can infect both the application programs and the boot sector of a disk.

20.   ______________is a program containing code that can generate multiple copies of itself .

21.   _______________virus infects or substitutes its own code for either the DOS boot sector or the master boot record(MBR)

22.    _______________viruses infect executable program files having an extension .exe,.com,or.dll.

23.   ______________code is a code that mutates while keeping the original algorithm intact.

24.   A  _______________ virus is a complicated computer virus that affects data types and functions.

25.   ______________viruses are very difficult to identify and detect by anti-virus.

Answers:

1. John Von Neumann	2. Macro	3. Computer Virus	4. Computer Virus	5. can replicate
6. replication	7.Antivirus	8. Antivirus Software	9.Program	10. Message carrying
11. Computer Virus	12. Firewall	13. Antivirus Software	14.MBR	15. install
16. executable	17. Trojan horse	18. worm	19. Multipartite	20. Computer Virus
21.Boot Sector Virus	22. File infecting	23.Polymorphic	24.polymorphic	25.Stealth

5 Match the Following

1.

a) Boot sector virus                                        McAFee

b) File infecting virus                      W97M.Melissa

c) Macro virus                                      stoned

d) Polymorphic virus                            Frodo

e) Stealth virus                                      Friday the 13^th

                                                          Involuntary

2.

a)Macro virus          A virus that infects the part of the computer called a system sector.

b)Antivirus              A virus that directly  attack and modify program files, which are usually .EXE or .COM files.

c)Boot virus            The special macros that self- replicate in the data files of personal productivity applications such as

Microsoft Word and Excel.

d)File virus          A class of program that searches your hard drive and floppy disks for any known or potential viruses.

3.

a)Boot virus                       A computer virus that infect files and boot records.

b)Files virus                       A computer virus designed to infect the boot sector of the disk.

c)Polymorphic virus         A computer virus that infect program written in scripting language.

d)Script virus                     A computer virus that infect executable program files having an  extension .exe, .com or .dll.

e) Stealth virus                  A computer virus that can change its appearance with every infection.

4.

a) CPAV                                Propagating virus

b) Software piracy                 Antivirus software    

c) Worm                                Virus transfer                         

d) Password                           Purpose of virus development

Virus safety measure

5.

a. Boot virus                       Cascade

b. Parasitic virus                 Disk Killer

c. polymorphic virus          Whale

d. Script viruses                 I LOVE YOU

e. stealth virus                    Jerusalem

Answers:

1. -,c,a,e,b,d

2. c, d, -, a, b

3. e, a, d, b, c

4. c, a, -, b, d

5. c, a, e, b, d

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