Computer Science
Class-7
Chapter-9 Computer Virus
A. Tick the correct answer:
1. Which virus infects the boot record or master boot record?
a. Worm b. boot virus c. spyware
Answer: Boot virus
2. When was the first PC virus released?
a. 1987 b. 1985 c. 1897
Answer: 1987
3. Which one of the following is the name of a virus?
a. Sunday b. Monday c. Friday
Answer: Sunday
4. Who released the first PC virus?
a. Duke brothers
b. Wright brother
c. Farooq Alvi Brothers
Answer: Farooq Alvi Brothers
5. Antivirus either removes the virus or puts it in a :
a. scan b. quarantine c. recycle bin
Answer: Quarantine
B. Fill in the blanks using words from the help box:
(Antivirus software, disrupts, boot, pirated, software)
1. A computer virus __________ the normal operation of a computer.
Answer: Disrupts
2. Malware is made up of two words Malicious and ___________.
Answer: Software
3. __________ viruses infect the boot record or master boot record.
Answer: Boot
4. We should not install ___________ software.
Answer: Pirated
5. ___________ are used to prevent, identify, detect and remove all kinds of malicious software.
Answer: Antivirus software
C. Write T for true and F for false:
1. A computer virus is similar to a biological virus.
Answer: F
2. We should equip our computer with antivirus programs.
Answer: T
3. Trojan horses are self replicating.
Answer: F
4. Virus has no effect on the speed of a computer.
Answer: F
5. Virus can enter our computer through an infected pen drive.
Answer: T
D. Write one word for the following:
1. Software to detect and remove virus___________.
Answer: Antivirus
2. Virus which infect the boot record _____________.
Answer: Boot virus
3. Virus which infect executable files_____________.
Answer: Program virus
4. Virus which infect documents, such as word or excel________.
Answer: Macro virus
E. Answer the following questions:
1. What is a computer virus? Name its types.
Answer: A computer virus is a program or a set of programs that disrupts the normal operation of a computer. Virus infects or destroys data. It enters in the computer without the permission or knowledge of the user.
Types of viruses:
* Boot virus
* Program virus
* Macro virus
2. Write any five possible symptoms of virus in a computer.
Answer: Five possible symptoms of virus:
* Frequent hanging of the system.
* Showing abnormal write protect error.
* Reformatting the hard disk.
* Increasing the use of disk space.
* Deleting or damaging files.
3. What do you understand by the term spyware?
Answer: Spyware: Spyware is a type of malware that covertly gathers user's information through the user's internet connection without his or her knowledge usually for advertising purpose. Spyware applications are typically bundled as a hidden component of freeware or shareware programs that can be downloaded from the Internet.
4. Write any three ways that can help in preventing a virus infection.
Answer: Three ways that can help in preventing a virus infection:
* Every PC should be equipped with some antivirus program.
* Always scan the pen drive before copying files.
* Do not install pirated software
5. Briefly explain Antivirus software.
Answer: Antivirus software: Antivirus software are also known as anti malware software. They are computer software which are used to prevent, identify, detect and remove all kinds of malicious software. It got its name antivirus, as it was initially developed to detect and remove computer viruses.
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