Grade:10 (Computer Virus)
1) What is computer virus?
Ans: Computer virus is a type of computer program which
is written by the programmer
with the intent of destroying or 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 programmer's 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 websites
that are not secure
iv) Exchanging data and information over a network
4) What are
the symptoms of a computer virus?
Ans: The symptoms of computer viruses are:
i) Program takes a 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’s data.
v) Renaming all the files with different names.
5) Write
down the effects of the 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) Do not install pirated software, especially computer
games.
v) Do not interchange the internal disks among the
computers.
vi) Do not 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 to 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. Eg. Danish
Boot, Devel 941, Disk Killer etc.
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 application program is
called program virus. Eg. Acid Rain,
Alien.298, Crazy A etc.
14) What is
stealth virus?
Ans: The most dangerous types of virus which rarely gives
the information about its
presence in the computer system which generally infects
program files and boot records is
called stealth virus. Eg. Frodo, Joshi, Whale etc.
15) What is
multipartite virus?
Ans: The virus which infects both application programs
and the boot sector of a disk is
called multipartite virus. Eg. Invader, Flip, Tequila
dtc.
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. Eg. DMV, Nuclear and Word
Concept etc.
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 standalone malware computer
program that replicates itself in
order to spread to other computers.
19) What is
Trojan horse?
Ans: A Trojan horse is a program that appears harmless,
but is, in fact, malicious.
20) What is
cyber spying? How it works?
Ans: Cyber spying is the act or practice of obtaining
secret information without the
permission of the user. It works through the Internet,
networks or individual computers
through the use of cracking techniques and malicious
software including Trojan horse and
spyware.
21) What is
cyberwarefare?
3/4Ans: Cyberwarefare refers to politically motivate hacking
to conduct damage and spying
to others.
22) What is
adware? Explain.
Ans: Adware is a software package that automatically
extracts advertisements in order
to generate revenue for its author. It is usually seen by
the developer as a way to recover
development costs. It may allow the software to be
provided to the user for free of charge.
23) What is
spyware? Explain.
Ans: Spyware is software that gathers information about a
person or organization without
their knowledge or permission. It is mostly used for the
purposes such as tracking
Internet user on the web, spying on certain organization
or persons and serving up pop
up ads to Internet users.
24) Write
down the common characteristics of computer virus?
Ans: Common characteristics of computer virus are:
i. Replicate and spread on the others files.
ii. Destroy data, information, files or programs of a
file.
iii. Steal important data and information.
iv. Load and run unwanted applications.
v. Display the unnecessary messages or pictures.
vi. Cripple the operating system of a computer.
vii. Degrade overall
performance of the computer system.
