Computer-Science-Class-8 Chapter-1(2024-25):

Computer Science

Class-8

Chapter-1 Computer Virus

A. Tick the correct answer:

1. Which one of these statements is false?

a. Viruses stick to program files such as .exe, .sys, etc.

b. A Virus may or may not be destructive.

c. Viruses damage hardware parts like monitor, keyboard, mouse etc.

d. None of these

Answer: Viruses damage hardware parts like monitor, keyboard, mouse etc.

2. Viruses are written by __________.

a. Programmers        b. designers            c. engineers         d. notes pane

Answer: Programmers

3. Which one of the following is antivirus software?

a. MS office                b. Flash                    c. Norton             d. none of these

Answer: Norton

4. Which one of the following is the name of a virus?

a. Marburg                 b. Cell                       c. Tink                  d. None of these

Answer: Marburg

5. Which one of the following can replicate itself?

a. Spam                       b. Torjan horse       c. Worm               d. None of these

Answer: Worm

B. Fill in the blanks.

1. A _________ can destroy files, software and program applications.

Answer: Virus

2. A virus can _________ it self without any user action.

Answer: Replicate

3. _______ viruses infect files that are created using certain applications or programs.

Answer: Macro

4. Stoned virus is an example of ____________________.

Answer: Boot virus

5. ________ was the first known cell phone virus.

Answer: Commwarrier

6. You can prevent virus infections by using___________.

Answer: Antivirus

7. __________ virus get control over the system memory.

Answer: Memory Resident

C. Answer the following questions.

1. What is a computer virus?

Answer: A computer virus is small software program which has replicating capabilities and is designed to spread from one computer to another one. A virus can destroy files, software, program applications and cause loss of data.

2. Name some sources of computer virus.

Answer: Sources of computer virus:

* Through the Internet

* Through E-mail attachments

* Through removable storage devices

* Through Bluetooth transfer 

3. How would you find that your computer is attacked by a virus?

Answer: Some common symptoms of a virus in a computer:

* The computer runs very slow.

* The infected file may make copies of itself, which can use all the free space in the hard disk.

* A copy of the virus infected file may be sent to all the addresses in your E-mail address list.

* The virus may reduce security.

4. What are worms?

Answer:  A worm is a program very similar to a virus. It has the ability to self-replicate and can lead to negative effects on your computer.

5. Write any four ways that can help in preventing a virus infection.

Answer: Basic tips to avoid virus infection:

* Install antivirus software from a well-known and reputed company. Updated it regularly and use it regularly.

* Do not install pirated software.

* Scan CD or Pen Drive received from another person.

* Restrict access to your system.

 

6. What is antivirus software?

Answer: Antivirus software is a computer program that detects, prevents and takes action to remove malicious software programs, such as viruses and worms. You can help protect your computer against viruses by using antivirus software. 

7. Name some popular antivirus software.

Answer: There are some of popular antivirus software:

* Quick Heal Total Security

* McAfee Antivirus

* Kaspersky Antivirus

* Norton Antivirus

* AVG Antivirus

* Avast Antivirus