ASTRA GRADE 8 NOTES

Chapter 1: Virus and Antivirus


✅ MCQs (Choose the Correct Answer)

  1. Which type of virus waits for certain conditions to be fulfilled before getting activated?
    a) Logic Bomb
    b) Companion Virus
    c) Browser Hijacker
    d) None of these
    ✅ Answer: a) Logic Bomb

  2. Which kind of virus can infect Excel documents?
    a) Resident
    b) Boot Sector
    c) Macro
    d) None of these
    ✅ Answer: c) Macro

  3. Which of the following helps in preventing a virus infection?
    a) Restrict access to your system
    b) Install a firewall
    c) Scan pen drive
    d) All the above
    ✅ Answer: d) All the above

  4. Computer virus program is usually hidden in a __________.
    a) Operating System
    b) Application Program
    c) Monitor
    d) Both A and B
    ✅ Answer: d) Both A and B

  5. Virus can attack your computer through __________.
    a) Firewall
    b) Internet
    c) Antivirus
    d) Pop-up blocker
    ✅ Answer: b) Internet


🧩 Word Puzzles – Across

  1. Boot sector virus and Resident virus are examples of __________ virus.
    ✅ Answer: Resident

  2. __________ creates a loophole in a computer for virus infection.
    ✅ Answer: Trojan

  3. The virus which executes when the computer starts.
    ✅ Answer: Boot

  4. The virus which can automatically redirect the user to certain sites.
    ✅ Answer: Hijacker

🔽 Word Puzzles – Downward

  1. Harmful computer code.
    ✅ Answer: Virus

  2. Modern virus carrier.
    ✅ Answer: Internet

  3. Special program which can detect and remove viruses from a computer is called __________.
    ✅ Answer: Antivirus

  4. A virus that targets productivity applications such as Word & Excel.
    ✅ Answer: Macro


    📘 Match the Following

    1. Macro Virus – e) productivity applications such as Word & Excel

    2. Trojan Horse – d) creates a loophole for virus infection

    3. Web Scripting – a) execution of complex codes by the websites

    4. USB Drive – b) one of the means to transfer virus

    5. Symantec – c) example of an antivirus software

    ✍️ Fill in the Blanks

    1. Trojan horse is a program that is loaded onto your computer without your knowledge.

    2. Logic bomb virus can falsely indicate that there is no more space for new applications.

    3. Antivirus programs can detect most of the virus infections.

    4. The easiest and quickest means of spreading computer virus is through the Internet.

    5. Firewall can alert you about unauthorized attempts to connect to your computer.

    🟨 One Word Substitution

    1. A computer program that can corrupt or delete data – Virus

    2. Type of virus that replicates itself but cannot attach to other programs – Direct Action virus

    3. A virus that can mutate – Polymorphic

    4. Hijacks browser functions – Browser Hijacker

    ✅ State True or False

    1. A virus can damage both software and hardware. – False

    2. A virus cannot transfer via Bluetooth. – False

    3. You should scan pen drives for viruses before using them. – True

    4. Computer viruses are often spread by attachments in e-mail messages. – True

    5. ‘Firewall’ will protect your computer from outside attempts – True

    🔘 Choose the Correct Answer

    1. Logic Bomb waits for certain conditions – a) Logic Bomb

    2. Virus that infects Excel – c) Macro

    3. Preventing virus infection – d) all the above

    4. Virus programs are hidden in – d) Both A and B

    5. Virus can attack through – b) Internet

    ✏️ Own Sentences

    1. Anti Virus: A software that detects and removes viruses from the system.

    2. Resident Virus: A virus that loads into the memory and stays there.

    3. Firewall: A security system that protects against unauthorized access.

    4. Boot Sector Virus: A virus that infects the master boot record of a disk.


  1. What is a computer virus and what does it do?
    A computer virus is a harmful program that spreads between computers and can damage data or slow down the system.

  2. Explain about firewall in brief.
    A firewall is a security tool that blocks unauthorized access to or from a computer network.

  3. Explain about any two types of virus you know.

  • Worm: Spreads through networks and slows down systems.

  • Trojan Horse: Looks like a useful file but secretly harms your computer.

  1. Give any three mediums through which a virus can attack a computer.

  • USB drives

  • Email attachments

  • Infected websites

  1. How can you protect your computer from viruses?

  • Use antivirus software

  • Don’t open unknown emails or links

  • Keep your system updated

Comments

Post a Comment

Popular posts from this blog

Class 9 Part B Term 2

Image
Commonly used Application Softwares Sample Paper Unit III: DIGITAL DOCUMENTATION Videos 1. What is OpenOffice Suite? Ans. OpenOffice is a powerful and free office suite, used by millions of people around the world. Its clean interface and feature-rich tools help you unleash your creativity and enhance your productivity. OpenOffice includes several applications that make it the most versatile Free and Open Source office suite on the market. Some of its applications are: Writer (word processor), Calc (spreadsheets), Impress (presentations).  2. What are the different components of the openoffice writer? Ans. The OpenOffice Writer window has the following components:  Title Bar - Displays the name of current document and application. It also contains control buttons. Menu Bar - It contains all the menu options. Example - File, Edit, View etc. Standard Toolbar - It displays the icon of the commonly used commands (like Save, Undo, Redo, New, Open etc.) Formatting Toolbar - It ...
Read more

class 6 Term2

Image
    Chapter 6 - Introduction to Animate CC Short answer type questions- Q1. State the use of properties panel? Ans.Properties Panel displays the different properties of the object which is selected. Q2. What is gradient fill? Ans. Gradient Fill is a combination of colours where one colour changes into another. Q3.What are the different type of symbols that can be created in Animate CC? Ans. There are three types of symbol in Animate CC: Movie Clip Symbol, Button Clip Symbol and Graphic Symbol. Long answer type questions- Q1. Explain these: i. Selection - Selection tool is used to select objects on the stage for modification. ii. Pen- Pen tool is used to draw lines and curves by creating a series of dots that are automatically connected.  iii. Free-transform tool- Free-transform tool is used to move, scale, rotate, skew, or distort objects.  Q2.After drawing an object on the stage, what steps need to be taken to convert it into a symbol? Ans. To create ...
Read more

NCERT GRADE 10

     Unit II: Electronic Spreadsheet (Advanced) using LibreOffice Calc 1. What is an electronic spreadsheet? An electronic spreadsheet is a computer program that helps you enter, store, and calculate data in rows and columns. You can use formulas to do quick calculations and create charts to show the data. Example: Microsoft Excel or LibreOffice Calc. 2. What is LibreOffice Calc? LibreOffice Calc is a free spreadsheet software, just like Microsoft Excel. It is used to enter data, perform calculations, make graphs, and analyze information. It is a part of the LibreOffice package. 3. What is data analysis? Data analysis means studying data to find useful information, patterns, or answers. It helps in making better decisions. For example, analyzing marks of students to find the average and highest score. Chapter 4: Analyse Data Using Scenarios and Goal Seek 1. Define the terms: (a) Consolidate function It is used to combine data from different sheets or ranges into one summa...
Read more