Exercise 5 : Computer Virus

Grade 7 Computer Science Worksheet - Computer Viruses

Group A: Multiple Choice Questions (MCQs)

Tick (✓) the correct answer:

1. What does the letter 'V' stand for in the acronym VIRUS?

  • (a) Virtual
  • (b) Vital
  • (c) Valuable
  • (d) Visual

2. Which was the world's first experimental computer virus?

  • (a) Brain
  • (b) Trojan
  • (c) Creeper
  • (d) Windows Defender

3. Why was the "Brain" virus created in 1986?

  • (a) To steal money from banks
  • (b) To stop software piracy
  • (c) To shut down the internet
  • (d) To delete school files

4. Which of the following is NOT a method through which a virus spreads?

  • (a) Using an infected USB flash drive
  • (b) Downloading pirated games
  • (c) Typing a document in Microsoft Word
  • (d) Opening unknown email attachments

5. What is the primary job of an Antivirus program?

  • (a) Increase typing speed
  • (b) Clean and protect the computer from viruses
  • (c) Connect the computer to Wi-Fi
  • (d) Edit images and videos

Group B: Match the Following

Match the items in Column A with their correct pair in Column B:

Column A Column B
1. Creeper A. Built-in security tool in Windows
2. Brain B. Stops unauthorized access and cleans viruses
3. USB Drive C. Created by Bob Thomas in 1971
4. Antivirus Software D. Common hardware path for viral spread
5. Windows Defender E. First PC virus created by two brothers in Pakistan

Group C: Short Answer Questions

Q1. Define a computer virus in simple words.

Q2. List any two common signs that show a computer is infected by a virus.

Q3. Write two safe practices to protect your computer from virus attacks.

Q4. Name any three popular antivirus programs.

Hint

Group A (MCQs): 1-(b), 2-(c), 3-(b), 4-(c), 5-(b)

Group B (Match): 1-C, 2-E, 3-D, 4-B, 5-A

Group C (Sample Short Answers):

  • Q1: A computer virus is a harmful human-made program that damages, slows down, or steals data from a computer.
  • Q2: (1) Computer runs very slowly. (2) Files disappear automatically or strange pop-up errors appear.
  • Q3: (1) Always scan USB drives before opening files. (2) Keep genuine antivirus software installed and updated.
  • Q4: Windows Defender, Kaspersky, Avast, Quick Heal, or Norton.