.jpg)
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
