Computer Virus - Class 7 Computer Science (CBSE)
Computer Science is not a single fixed NCERT middle-school textbook in the same way as Maths or Science. This page follows a current 2026-27 Class 7 school syllabus pattern and keeps the notes practical for students.
1. Why this chapter matters
Computer viruses and malware can damage files, steal information, or slow systems. Digital safety begins with recognising risk.
Computer answers should be precise. Use the correct term, explain it in simple words, and add one example from actual computer use.
2. Core ideas
- virus: Learn the meaning and one classroom or daily-life example.
- malware: Learn the meaning and one classroom or daily-life example.
- antivirus: Learn the meaning and one classroom or daily-life example.
- worm: Learn the meaning and one classroom or daily-life example.
- trojan: Learn the meaning and one classroom or daily-life example.
- spyware: Learn the meaning and one classroom or daily-life example.
3. Worked examples
Example 1: What is a computer virus?
A harmful program that can copy itself and affect files or system behaviour.
Example 2: Name two safe practices.
Use antivirus software and avoid unknown links or attachments.
4. Skill practice
- Make a labelled diagram, table, or flow of the topic.
- Write definitions in your own words.
- Practise one real computer task where possible.
- For safety chapters, write do's and don'ts.
- For HTML/spreadsheet/database chapters, write the exact steps or syntax.
5. Common mistakes
- Memorising terms without examples.
- Mixing up data, information, file, folder, record, and field.
- Writing unsafe online behaviour as a suggestion.
- Forgetting that syntax and spelling matter in HTML and formulas.
6. Practice set
- Define the main idea of Computer Virus.
- What is a computer virus?
- Name two safe practices.
- Write two key terms from this chapter.
- Give one real-life use.
- How can you make your answer clearer?
7. Answer key
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Define the main idea of Computer Virus. Answer: Computer viruses and malware can damage files, steal information, or slow systems. Digital safety begins with recognising risk.
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What is a computer virus? Answer: A harmful program that can copy itself and affect files or system behaviour.
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Name two safe practices. Answer: Use antivirus software and avoid unknown links or attachments.
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Write two key terms from this chapter. Answer: Use terms from: virus, malware, antivirus, worm, trojan, spyware. Define each with an example.
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Give one real-life use. Answer: Connect the topic to school, home, online safety, data work, or webpage creation.
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How can you make your answer clearer? Answer: Use a diagram, labelled table, example, or step-by-step instruction.
8. Quick revision
- Themes: virus, malware, antivirus, worm, trojan, spyware.
- Learn definitions with examples.
- Practise one diagram, table, formula, or syntax item.
- For safety topics, prepare two responsible-use points.
