Computer Virus: Meaning, Types and Causes of Computer Virus Primary 5 (Basic 5) Second Term Week 5 Information Technology – Computer Studies

COMPUTER VIRUS: MEANING, TYPES AND CAUSES OF COMPUTER VIRUS

INFORMATION TECHNOLOGY (COMPUTER STUDIES)

PRIMARY 4 – SECOND TERM – WEEK 5

THEME – BASIC COMPUTER OPERATIONS

PREVIOUS LESSON – Microsoft PowerPoint: How to Add and Format Text Primary 4 (Basic 4) Second Term Week 4 Information Technology – Computer Studies

TOPIC – COMPUTER VIRUS 

LEARNING AREA

1. Introduction

2. Meaning and Types of Computer Virus

3. Causes and Effects of Computer Virus

4. Ways of Preventing Computer Virus and Importance of Preventing Computer virus

5. Weekly Assessment: Test Questions and Answers/Assignment

6. Summary

LEARNING OBJECTIVES 

By the end of the lesson, pupils should be able to:

1. Explain the meaning of a computer virus.

2. Identify different types of computer viruses.

3. State the causes of computer virus infection.

4. Explain the effects of computer viruses on a computer.

5. Suggest ways of preventing computer virus attacks.

ENTRY BEHAVIOUR

Pupils have previously learned about computer programs and the safe use of computers. They know that computers are used to store and process information.

This lesson builds on that knowledge by introducing computer viruses, which are harmful programs that can damage computers and files. Pupils will learn the meaning, types, causes, effects, and ways of preventing computer virus attacks. Later, they will learn about antivirus software, which is used to detect, prevent, and remove computer viruses.

INSTRUCTIONAL MATERIALS

The teacher will teach the lesson with the aid of:

1. Computer

2. Projector (if available)

3. Charts showing different types of computer viruses

4. Antivirus software

5. Whiteboard and marker

6. Pictures illustrating virus attacks on computers

METHOD OF TEACHING

Choose a suitable and appropriate methods for the lessons.

Note – Irrespective of choosing methods of teaching, always introduce an activities that will arouse pupil’s interest or lead them to the lessons. 

REFERENCE MATERIALS

1. Scheme of Work

2. 9 – Years Basic Education Curriculum

3. Course Book

4. All Relevant Material

5. Online Information

CONTENT OF THE LESSON

INTRODUCTION

Just as people can become sick through germs, computers can also become infected by harmful programs called computer viruses. These viruses can damage files, slow down computers, or stop them from working properly.

In this lesson, pupils will learn the meaning of a computer virus, the types of computer viruses, their causes, and how to prevent virus attacks on computers.

MEANING OF COMPUTER VIRUS

A computer virus is a harmful computer program that enters a computer without permission and can damage files, slow down the computer, corrupt data, or make the computer stop working properly.

A computer virus can spread from one computer to another through infected files and storage devices.

TYPES OF COMPUTER VIRUS

1. Boot Sector Virus – Attacks the part of the computer that starts the operating system.

2. File Virus – Infects files and computer programs.

3. Macro Virus – Attacks documents created with applications such as Microsoft Word and Microsoft Excel.

4. Worm – Spreads quickly from one computer to another through networks without attaching itself to a file.

5. Trojan Horse – Pretends to be a useful program but secretly damages the computer or steals information.

6. Ransomware – Locks files or the computer and demands payment before access is restored.

CAUSES OF COMPUTER VIRUS

Computer viruses can enter a computer through:

1. Infected flash drives (USB drives).

2. Downloading files from unsafe websites.

3. Opening infected email attachments.

4. Installing pirated or unknown software.

5. Sharing infected files from another computer.

6. Visiting unsafe websites.

7. Connecting infected external storage devices.

EFFECTS OF COMPUTER VIRUS

1. It slows down the computer.

2. It damages or deletes important files.

3. It causes computer programs to stop working.

4. It makes the computer freeze or restart unexpectedly.

5. It steals personal information.

6. It corrupts stored data.

WAYS TO PREVENT COMPUTER VIRUS

1. Install antivirus software.

2. Update the antivirus regularly.

3. Scan flash drives before opening them.

4. Avoid downloading files from unknown websites.

5. Do not open suspicious email attachments.

6. Use only genuine software.

7. Keep the computer operating system updated.

IMPORTANCE OF PREVENTING COMPUTER VIRUS

1. It protects important files.

2. It keeps the computer working properly.

3. It prevents loss of information.

4. It improves computer security.

5. It reduces the risk of data theft.

6. It saves the cost of repairing damaged computers.

WEEKLY ASSESSMENT: TEST QUESTIONS AND ANSWERS/ASSIGNMENT 

A. Multiple Choice Questions (5 Marks)

1. A computer virus is a ______.

A. useful computer program

B. harmful computer program

C. printer

D. keyboard

2. Which of the following is a type of computer virus?

A. Trojan Horse

B. Microsoft Word

C. Calculator

D. Paint

3. One common way a computer virus spreads is through ______.

A. clean books

B. pencils

C. speakers

D. infected flash drives

4. Which type of virus can spread from one computer to another through networks without attaching itself to a file?

A. File Virus

B. Boot Sector Virus

C. Worm

D. Macro Virus

5. A computer virus can ______.

A. damage files

B. improve computer speed

C. print documents

D. increase memory size

B. Fill in the Blanks (5 Marks)

6. A computer ______ is a harmful program.

7. A ______ Virus attacks computer files.

8. A ______ can enter a computer through an infected flash drive.

9. Opening infected email ______ can spread computer viruses.

10. Installing ______ software may introduce viruses into a computer.

C. True or False (5 Marks)

11. Computer viruses can damage files. ______

12. A Worm is a type of computer virus. ______

13. Downloading files from unsafe websites can spread computer viruses. ______

14. A computer virus improves the performance of a computer. ______

15. Computer viruses can cause a computer to stop working properly. ______

D. Match Column A with Column B (5 Marks)

Column A – Column B

16. Boot Sector Virus – A. Attacks computer files

17. File Virus – B. Pretends to be useful software

18. Worm – C. Attacks Word and Excel documents

19. Trojan Horse – D. Attacks the boot sector

20. Macro Virus – E. Spreads through networks

ANSWER KEYS

1. B – Harmful computer program

2. A – Trojan Horse

3. D – Infected flash drives

4. C – Worm

5. A – Damage files

6. virus

7. File

8. virus

9. attachments

10. pirated (or unknown)

11. True

12. True

13. True

14. False

15. True

16. D – Attacks the boot sector

17. A – Attacks computer files

18. E – Spreads through networks

19. B – Pretends to be useful software

20. C – Attacks Word and Excel documents

SUMMARY

In this lesson, pupils learned that a computer virus is a harmful computer program that enters a computer without permission and can damage files, corrupt data, slow down the computer, or make it stop working properly.

They also learned the common types of computer viruses, including:

• Boot Sector Virus

• File Virus

• Macro Virus

• Worm

• Trojan Horse

• Ransomware

Pupils identified the common causes of computer virus infection, such as:

• Using infected flash drives.

• Downloading files from unsafe websites.

• Opening infected email attachments.

• Installing pirated or unknown software.

• Sharing infected files.

Finally, pupils learned the effects of computer viruses, such as loss of files, slow computer performance, and data corruption. They also learned ways to prevent virus attacks, including installing and updating antivirus software, scanning storage devices before use, avoiding suspicious downloads, and using genuine software.

PRESENTATION

To deliver the lesson, the teacher adopts the following steps:

Step 1: Introduction – The teacher asks pupils if they have ever heard of a computer that suddenly stopped working or lost important files. The teacher explains that this can happen because of harmful programs called computer viruses.

Pupils’ Activities: Pupils share their experiences or ideas about computers that stopped working and listen attentively.

Step 2: Meaning of Computer Virus – The teacher explains that a computer virus is a harmful computer program that enters a computer without permission and can damage files, corrupt data, slow down the computer, or make it stop working properly.

Pupils’ Activities: Pupils explain the meaning of a computer virus in their own words.

Step 3: Types of Computer Virus – The teacher introduces the common types of computer viruses:

• Boot Sector Virus

• File Virus

• Macro Virus

• Worm

• Trojan Horse

• Ransomware

The teacher briefly explains each type.

Pupils’ Activities: Pupils identify and mention different types of computer viruses.

Step 4: Causes of Computer Virus – The teacher explains how computer viruses spread through:

• Infected flash drives.

• Unsafe websites.

• Infected email attachments.

• Pirated or unknown software.

• Sharing infected files.

Pupils’ Activities: Pupils identify different causes of computer virus infection.

Step 5: Effects and Prevention of Computer Virus – The teacher discusses the effects of computer viruses and explains how to prevent virus attacks by:

• Installing antivirus software.

• Updating antivirus regularly.

• Scanning flash drives.

• Avoiding suspicious downloads.

• Using genuine software.

Pupils’ Activities: Pupils mention the effects of computer viruses and suggest ways to prevent them.

Step 6: Group Activity – The teacher divides the class into four groups and assigns the following activities:

• Group 1: Explain the meaning of a computer virus and state its effects.

• Group 2: List and explain the different types of computer viruses.

• Group 3: Identify the causes of computer virus infection.

• Group 4: Discuss and present ways of preventing computer virus attacks.

Each group presents its work before the class.

Pupils’ Activities: Pupils discuss, complete the assigned activities, and present their findings.

Step 7: Lesson Summary – The teacher reviews the meaning, types, causes, effects, and prevention of computer viruses.

Pupils’ Activities: Pupils answer oral questions and summarise the lesson.

Step 8: Evaluation – The teacher asks oral and written questions to assess pupils’ understanding of computer viruses, their types, causes, effects, and prevention.

Pupils’ Activities: Pupils answer the evaluation questions and participate actively in the lesson.

CONCLUSION

To conclude the lesson for the week, the teacher revises the entire lesson and links it to the following week’s lesson.

NEXT LESSON

Antivirus: Meaning and Types of Antivirus Primary 4 (Basic 4) Second Term Week 5 Information Technology – Computer Studies

LESSON EVALUATION 

Teacher asks pupils,

1. What is a computer virus?

2. Mention five types of computer viruses.

3. State five causes of computer virus infection.

4. Mention five effects of computer viruses on a computer.

5. Explain the difference between a computer virus and a computer program.

6. Which type of virus:

(a) Attacks computer files?

(b) Pretends to be useful software?

(c) Spreads through computer networks?

7. State five ways of preventing computer virus attacks.

8. Why is it dangerous to use an infected flash drive?

9. What can happen if you download software from an unsafe website?

10. Demonstrate your understanding by explaining how a computer virus can enter a computer and describe the steps you would take to prevent virus infection.