COMPUTER VIRUS

QUESTION AND ANSWER

Chapter -4

COMPUTER 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 takes 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) McAfe

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.