Computer Science
Class-VII
Chapter-4 Virus and Anti-virus
A. Tick the correct option:
1. A computer virus is a small software program that spreads from one ____ to another.
a. computer b. data c. e-mail d. software
Answer: Computer
2. Computer viruses are frequently spread by attachments in ____ messages or by instant messaging messages.
a. software b. email c. computer d. virus
Answer: Email
3. ______ are programs that replicate themselves inside a computer.
a. Computers b. Software c. viruses d. codes
Answer: Viruses
4. Some viruses do nothing except _____ peters said.
a. original b. creative c. initial d. replicate
Answer: Replicate
5. The task of a virus is not always destructive like ______ files.
a. deleting b. supportive c. mailing d. initial
Answer: Deleting
6. Often viruses will spread via shared _____ email or over other media.
a. computer b. folders c. behavior d. codes
Answer: Folders
7. Computer viruses are classified according to their nature of infection and :
a. folders b. codes c. behaviour d. share
Answer: Behaviour
8. A ______ horse is a malicious software program that hides inside other programs.
a. Worm b. Spyware c. fixer d. Trojan
Answer: Trojan
B. Fill in the blanks:
1. A computer virus might _______ or delete data on a computer.
Answer: Corrupt
2. Viruses can be disguised as _________ of funny images, greeting cards, or audio and video files.
Answer: Attachments
3. Computer viruses also spread through ______ on the internet.
Answer: Downloads
4. Viruses are programs that ______themselves inside a computer.
Answer: Replicate
5. The Melissa virus from March _______ is a good example of how viruses inflict damage.
Answer: 1999
6. A virus that targets a network of ___________ can even more easily.
Answer: Computers
7. A _________ is computer code that spreads without user interaction.
Answer: Worm
8. _________ programs scan for viruses trying to get into your email, operating system, or files.
Answer: Antivirus
9. Some antivirus programs are sold with _______ subscriptions.
Answer: Annual
10. ______ windows are small browser windows that appear on top of the website you're viewing.
Answer: Pop-up
C. Write ture or false:
1. A computer virus may corrupt or delete data on a computer.
Answer: True
2. A virus is inactive until you have executed an infected program or application.
Answer: False
3. A computer virus acts in a destructive manner like a biological virus.
Answer: True
4. A computer virus cannot do a physical damage to computer hardware.
Answer: True
5. A computer virus can spread in several ways.
Answer: True
6. Some common types of computer virus are spyware and trojan.
Answer: True
7. Do not open email attachments if you do not recognise the sender.
Answer: True
8. A computer virus cannot infect write protected discs.
Answer: True
D. Answer the following Questions:
1. What is the full form of virus?
Answer: Full form of virus:
Vital Information Resources Under Siege
2. What are the Trojan horses?
Answer: A Trojan horse is a malicious software program that hides inside other programs.
3. What is a good example of viruses inflict damage?
Answer: The Melissa virus from march 1999 is a good eample of how viruses inflilct damage.
4. What are the symptoms of a computer virus?
Answer: Your computer may be infected if your recognize the following:
* Slow computer performance
* Erratic computer behaviour
* Frequent computer crashes
5. Write different types of computer virus.
Answer: Different types of computer virus:
* Worm
* Trojan horse
* Spyware
6. What is a computer virus? Why is it named virus?
Answer: A computer virus is a small software program that spreads from one computer to another.
7. How does the virus spread? Explain briefly.
Answer: Virus spread in different ways. Virus mostly spread through the network or internet. Virus spread from one computer to another via sharing files or folders.
8. What does the virus do?
Answer: Virus can do many things in our computer:
* Virus may infect the computer files or folders.
* Virus may delete files or folders.
* Virus may damage computer windows.
9. What is anti-virus software?
Answer: Anti-virus is a software that protect our computer from viruses. Antivirus is a program that find the virus in our computer and delete it.
10. What is worm?
Answer: A worm is a computer code that spreads without user interaction.Most worms begin as email attachments that infect a computer when they are opened.
E. Give the difference between:
1. Virus and Anti-virus
Answer: Virus is a harmfull program for our computer. Antivirus is a program that protect our computer from virus.
2. Worms and Trojan horse
Answer: A worm is a computer code that spreads without user interaction.
A Trojan horse is a malicious software program that hides inside other programs.
3. Spyware and rogue security software
Answer: Spyware can install on your computer without your knowledge.
A rogue security software program tries to make you think that your computer is infected by a virus.
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