Chapter :- 1 Computer Virus
Chapter :- 1 Computer Virus
Tick the correct answer
1.________ get activated every Friday which occurs on 13th of a Month.
a. Trojan Horse
b. File Infector
c. Jerusalem Virus
2._________________ virus adds virus code to regular programming code in a program file.
a.File Infector
b.Boot Sector
c.Worm
3._____________ is a program that displays online advertisment in a banner on the Web page.
a.Adware
b.Trojan Horse
c.Worms
4. A program that detects the change caused by a virus in the computer is ____________
a.Virus Detector
b.Antivirus
c.None
5.The __________ is the desctructive event the malware is intended to deliver.
a. Payload
b.Downloads
c.Temp File
True and False
1. Virus can damage or destory the operating system . True
2.Boot Sector virus is a harmless virus program . False
3.The sleeper virus is known to steal your personal and financial infomation. True
4.Viruses get activated by downloading an infected file from the internet. True
5.Virus cannot affect excetuable file. False
6.We should ignore new virus alerts and new virus hoaxes while using Internet. False
Q.3 Fill in the blanks.
1.Virus stand for Vital Information Resources under Seize .
2.Virus are programmed intentionally by a programmer known as Virus Author
3.A virus enters a computer through a attachement with an email
4. Trojan Horse virus comes as a friendly program.
5.A Virus Defination is known specific pattern of virus code.
Q.4 Define the folllwing
1.Rootkit :- Rootkit is a program that hides in a computer and allows someone from a remote location to take full control of the computer.
2.Logic Bomb :- It is a program or portion of a program, which lies dormant until a specific piece of program logic is activated.
3.Virus Signature :- Antivirus program use virus signature as one of their techniques for detecting viruses.
4. Virus Hoax :- It is an email message that wants users of a non-exsitence virus or other malware.
Q.5 Answer in 1-2 sentence.
1.What is a computer virus?
Ans :- Virus are program which created deliveratly to damage critical information and data.
2.How does christmas virus spread?
Ans :- It is an e-mail worms that spread via e-mail as a small executable file with variety of names and extension.
3.What is a malware?
Ans :- Malicious software is a program that act without a knowledge and deliberately alters the computer operations.
4.Why do we use antivirus program ?
Ans :- An antivirus program protect a computer against virus identifying and removing virus in the memory , storage etc.
5.Name some antivirus software programs.
Ans :- Nortion , Mcafee ,AVG , TOTALAV and Quick heal.
Q.6 Answer Briefly.
Q.1 What is Boot Sector virus?
Ans :- This virus attaches itself to the boot sector of the disk. This sector is the part of the disk where start-up instructions and the file-allocation tables are kept. This sector is read and loaded into the memory every time the disk is booted. Evidently, this virus is also very dangerous.
Q.2 Write Breifly about the source of computer virus.
Ans :-
E-MAIL: E-mail viruses are spread by files attached to e-mail messages. You cannot get an e- mail virus from a message that contains only text. When you open an e-mail attachment that contains a virus, the virus spreads to your computer.
INTERNET DOWNLOAD: There is a lot of stuff to download from the Internet. But if something in the stuff, you want to download, is infected by virus, then the virus comes to your computer system. Now virus replicates itself and infects other files on your computer. This means if your computer is infected by virus then whatever file you share with others could contain the virus.
DISTRIBUTION OF SOFTWARE: If your computer is virus-infected and you copy a software on a CD to distribute to someone, the virus of your computer might also get copied on the CD. The person, who installs this software on his computer, unknowingly gets his computer infected by the virus.
Q.3 What is an e-mail virus?
Ans :- E-MAIL: E-mail viruses are spread by files attached to e-mail messages. You cannot get an e- mail virus from a message that contains only text. When you open an e-mail attachment that contains a virus, the virus spreads to your computer. If you forward the attachment to other people, their computers will also get affected after opening the attachment.
Q.4 What is Ransomware virus ? How does it spread.
Ans :- Ransomware is a virus that restricts access to your computer system and demands a ransome (money) to be paid in order to remove the restriction.
Ransomware can enter your computer through an e-mail attachment or through your web browser if you happen to visit a website that is infected with this type of virus. It can also access your PC or computer via your network
Q.5 Write any three precaution that should be taken to prevent computer virus.
Ans :-(1) Install an antivirus program and update the virus signature files regularly.
(2) Stay informed about new virus and virus program.
(3)scan and download program for viruses.
Q.3 Fill in the blanks.
1.Virus stand for Vital Information Resources under Seize .
2.Virus are programmed intentionally by a programmer known as Virus Author
3.A virus enters a computer through a attachement with an email
4. Trojan Horse virus comes as a friendly program.
5.A Virus Defination is known specific pattern of virus code.