Std VII | II Semester Revision | Lesson 6 & Lesson 7
Lesson 6 & Lesson 7 – All Questions & Answers
Lesson No. 6 – Computer Viruses
A) Answer the Following
Q1. What is a computer virus?
Ans:- A computer virus is a harmful program that enters a computer without permission and damages data or system files.
Q2. What is a Trojan virus?
Ans:-A Trojan virus is a malicious program that looks like useful software but secretly harms the computer.
Q3. What is spyware?
Ans:-Spyware is a program that secretly collects personal information like passwords and browsing details.
Q4. What is a worm?
Ans:-A worm is a virus that spreads automatically from one computer to another through networks.
Q5. State any two symptoms of a computer virus.
Ans:-Computer becomes slow; Files get deleted automatically.
Q6. How does a virus enter a computer?
Ans:-Viruses enter through infected pen drives, email attachments, internet downloads, or pirated software.
Q7. What is a Boot Sector virus?
Ans:-A Boot Sector virus infects the booting part of a hard disk and starts when the computer is switched on.
Q8. What is a Macro virus?
Ans:-A Macro virus infects files created using applications like MS Word or MS Excel.
Q9. What is antivirus software?
Ans:-Antivirus software is a program that detects, prevents, and removes viruses from a computer.
Q10. Name any two antivirus software.
Ans:-Quick Heal, Avast.
B) True or False
- A computer virus can damage data – True
- Trojan virus is a useful software – False
- Spyware steals personal information – True
- Worms need user action to spread – False
- Antivirus software protects the computer – True
- Boot Sector virus affects documents only – False
- Viruses can enter through pen drives – True
- Macro viruses affect MS Word files – True
- Updating antivirus is not necessary – False
- Computer viruses are harmless programs – False
C) Match the Following
| 1. Trojan | g. Disguised harmful program | a. Affects booting process |
| 2. Spyware | d. Steals user information | b. Infects document files |
| 3. Worm | f. Self-spreading virus | c. Removes viruses |
| 4. Boot Sector Virus | a. Affects booting process | d. Steals user information |
| 5. Macro Virus | b. Infects document files | e. Changes its code |
| 6. Antivirus | c. Removes viruses | f. Self-spreading virus |
| 7. Polymorphic Virus | e. Changes its code | g. Disguised harmful program |
D) Full Forms
- AV – Antivirus
- CPU – Central Processing Unit
- OS – Operating System
- RAM – Random Access Memory
- ROM – Read Only Memory
- HDD – Hard Disk Drive
- USB – Universal Serial Bus
- LAN – Local Area Network
- WAN – Wide Area Network
- WWW – World Wide Web
- URL – Uniform Resource Locator
- IP – Internet Protocol
- GUI – Graphical User Interface
- PC – Personal Computer
- IT – Information Technology
- CD – Compact Disc
- DVD – Digital Versatile Disc
- MS – Microsoft
- PDF – Portable Document Format
- BIOS – Basic Input Output System
Lesson No. 7 – Computer Network
A) Answer the Following
Q1. What is a computer network?
Ans:-A computer network is a group of computers connected together to share data and resources.
Q2. Name three types of networks.
Ans:-LAN, WAN, MAN.
Q3. What is a Client-Server system?
Ans:-It is a network system where the server provides resources and the client uses them.
Q4. Give one advantage of a Client-Server system.
Ans:-Centralized control of data.
Q5. Give one disadvantage of a Client-Server system.
Ans:-If the server fails, clients cannot access resources.
Q6. What is a switch?
Ans:-A switch connects multiple devices in a network and forwards data to the correct device.
Q7. What is a router?
Ans:-A router connects different networks and directs data packets between them.
Q8. What is NIC?
Ans:-Network Interface Card (NIC) is a hardware used to connect a computer to a network.
Q9. What is an IP address?
Ans:-An IP address is a unique number assigned to each device on a network.
Q10. Give an example of Internet service.
Ans:-Facebook, Twitter, Blogs, Social Networking.
B) True or False
- LAN stands for Local Area Network – True
- WAN covers a small area like a home or office – False
- MAN stands for Metropolitan Area Network – True
- Client-server system allows centralized control – True
- Switch and router perform the same function – False
- NIC is required to connect a computer to a network – True
- IP addresses are same for all computers on a network – False
- Facebook is a network service on the Internet – True
- A server is a client in a Client-Server system – False
- IP addressing has classes from A to E – True
C) Match the Following
| 1. LAN | e. Local Area Network | a. Connects different networks |
| 2. WAN | g. Wide Area Network | b. Connects devices within a network |
| 3. MAN | f. Metropolitan Area Network | c. Network Interface Card |
| 4. NIC | c. Network Interface Card | d. Unique address of a device |
| 5. Switch | b. Connects devices within a network | e. Local Area Network |
| 6. Router | a. Connects different networks | f. Metropolitan Area Network |
| 7. IP Address | d. Unique address of a device | g. Wide Area Network |
D) Full Forms
- LAN – Local Area Network
- WAN – Wide Area Network
- MAN – Metropolitan Area Network
- NIC – Network Interface Card
- IP – Internet Protocol
- PC – Personal Computer
- WWW – World Wide Web
- URL – Uniform Resource Locator
- HTTP – HyperText Transfer Protocol
- HTTPS – HyperText Transfer Protocol Secure
- DNS – Domain Name System
- SMTP – Simple Mail Transfer Protocol
- FTP – File Transfer Protocol
- Wi-Fi – Wireless Fidelity
- ISP – Internet Service Provider
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