Looking for reliable SEBA Class 9 Computer Science Chapter 4 extra questions and answers for the 2026–27 academic year? Access important short questions, conceptual explanations, practical application notes, and exam-focused revision materials designed to help you score top marks in your annual exams.
Q1. What is the Internet?
Answer: The Internet is a global network of computers that connects millions of devices worldwide. It allows users to share and exchange information quickly. It is also known as the network of networks.
Q2. What is the full form of Internet?
Answer: The word Internet comes from “Interconnection of Networks,” which means connecting multiple smaller networks together.
Q3. Define Network Topology.
Answer: Network topology is the geometric arrangement or pattern of how computers are connected in a network. Examples include Mesh, Star, Bus, Ring, and Hybrid topologies.
Q4. What is Mesh Topology?
Answer: In Mesh topology, each device is connected to every other device directly. This provides high reliability and security but requires a large number of cables.
Q5. List any two advantages of Mesh Topology.
Answer: The failure of one link does not affect other links, and it is easy to detect faults. Mesh topology also provides high security due to direct links.
Q6. What is Star Topology?
Answer: In Star topology, all computers are connected to a central device such as a hub, switch, or router. All communication passes through this central device.
Q7. Give one advantage and one disadvantage of Star Topology.
Answer: The advantage of Star topology is that it is easy to install and to add new devices. The disadvantage is that if the central device fails, the entire network stops working.
Q8. What is Bus Topology?
Answer: In Bus topology, all computers are connected to a single main cable called the bus. All data travels through this main line.
Q9. Write one advantage and one disadvantage of Bus Topology.
Answer: Answer: The advantage of Bus topology is that it is easy to install and uses fewer cables. The disadvantage is that it is hard to detect faults and is not suitable for large networks.
Q10. What is Ring Topology?
Answer: In Ring topology, each computer is connected to two others, forming a ring. Data travels in one direction around the circle.
Q11. What is Hybrid Topology?
Answer: Hybrid topology is a combination of two or more topologies, such as Star and Ring. It provides better performance and flexibility.
Q12. What is the difference between Client and Server?
Answer: Answer: A client is a computer that requests data or services, such as a laptop or phone. A server is a powerful computer that stores and shares data or services with clients.
Q13. Give two examples of servers.
Answer: Examples of servers include a web server, which stores and delivers websites, and a file server, which stores and shares files. A print server manages printers.
Q14. What is a Protocol?
Answer: Answer: A protocol is a set of rules that control how data is sent and received in a network. It ensures that computers can communicate properly.
Q15. Name any four Internet Protocols and their uses.
Answer: HTTP is used for web pages, HTTPS is a secure version of HTTP, FTP is used for file transfer, and SMTP is used for sending emails.
Q16. Who invented the World Wide Web and when?
Answer: Tim Berners-Lee invented the World Wide Web in 1990, making the Internet easier to use with websites and browsers.
Q17. What was ARPANET?
Answer: ARPANET, or Advanced Research Projects Agency Network, was the first working prototype of the Internet, started in 1969 by the U.S. Department of Defense. It was the foundation of the modern Internet.
Q18. What is an Internet Service Provider (ISP)?
Answer: An ISP is a company that provides Internet connections to users. Examples include Jio, Airtel, and BSNL.
Q19. What are the two main types of Internet connections?
Answer: The two main types of Internet connections are wired connections, which use cables like DSL or fiber, and wireless connections, which use Wi-Fi, mobile data, or satellites.
Q20. What is the difference between Wired and Wireless Internet?
Answer: Wired Internet uses physical cables and provides faster and more stable connectivity. Wireless Internet uses radio signals, making it more flexible and portable.
Q21. What is a Wired Internet Connection?
Answer: A wired Internet connection uses cables to connect a computer to the Internet via an ISP. Data travels through cables such as telephone lines or coaxial cables. It offers stable and fast connectivity.
Q22. What is a Repeater?
Answer: A repeater is a device used to boost or amplify weak signals in a network cable. It helps extend the data transfer range of wired connections.
Q23. Define Data Transfer Rate and Range.
Answer: Data transfer rate is the amount of data sent per second. Data transfer range is the maximum distance a signal can travel through a cable.
Q24. What is a Dial-Up Connection?
Answer: A Dial-Up connection uses the telephone line and a modem to connect to the Internet. It converts analog signals to digital and provides slow speed, up to 56 Kbps. The phone line remains busy during use.
Q25. What are the limitations of Dial-Up Connection?
Answer: Dial-Up connection is very slow, cannot be used simultaneously with telephone calls, and is outdated today.
Q26. What is DSL (Digital Subscriber Line)?
Answer: DSL provides high-speed Internet through telephone lines and allows using the phone and Internet at the same time. There are two types: SDSL, which has equal upload and download speed, and ADSL, which has faster download speed.
Q27. Mention two advantages of DSL over Dial-Up.
Answer: DSL provides faster data transfer speed and allows the use of the telephone while using the Internet.
Q28. What is ISDN (Integrated Services Digital Network)?
Answer: ISDN is a digital network system that transmits both voice and data through telephone lines. It is faster and more reliable than Dial-Up but slower than DSL.
Q29. What is Cable Internet?
Answer: Cable Internet uses TV cables, such as coaxial cables, to provide high-speed Internet. It is suitable for streaming and gaming, but speed may drop if many users share the same connection.
Q30. Write two advantages of Cable Internet.
Answer: Cable Internet is high-speed and reliable. It also allows the simultaneous use of TV and Internet.
Q31. What is a Wireless Internet Connection?
Answer: Wireless Internet provides connectivity without cables, using radio waves or satellite signals. It connects devices like phones, laptops, and tablets via Wi-Fi, WiMAX, or satellites.
Q32. What is a Satellite Internet Connection?
Answer: Satellite Internet uses communication satellites to send and receive data. It requires a satellite, a ground station, and a VSAT dish at the user’s end. It works anywhere, making it ideal for remote areas.
Q33. Mention one advantage and one disadvantage of Satellite Internet.
Answer: The advantage of Satellite Internet is that it works even in remote locations. The disadvantage is that it is expensive and can be affected by bad weather.
Q34. What is Wi-Fi?
Answer: Wi-Fi, or Wireless Fidelity, uses radio signals to connect devices to a local wireless network. Devices connect to a Wi-Fi router to access the Internet. Wi-Fi typically covers small areas like homes or offices.
Q35. What are the types of Wi-Fi networks?
Answer: Open Wi-Fi networks do not require a password, while password-protected Wi-Fi networks require a password and provide better security.
Q36. What is WiMAX?
Answer: WiMAX, or Worldwide Interoperability for Microwave Access, is a long-range wireless Internet system. It provides high-speed broadband over several kilometers and is used for city-wide or rural Internet access.
Q37. Differentiate between Wi-Fi and WiMAX.
Answer: Wi-Fi has a short range and moderate speed, suitable for local networks like homes and offices. WiMAX has a long range and high speed, suitable for city-wide or rural coverage.
Q38. What is a Web Browser?
Answer: A web browser is software that allows users to access and view web pages on the Internet. It provides a graphical interface for easy navigation. Examples include Chrome, Firefox, Safari, and Edge.
Q39. What are the functions of a Web Browser?
Answer: A web browser opens and displays web pages, allows navigation using hyperlinks, supports downloading files, playing media, and filling online forms.
Q40. What is WWW (World Wide Web)?
Answer: The World Wide Web is a collection of web pages and web servers accessible through the Internet. It uses the HTTP protocol to transfer data between web servers and browsers. It was invented by Tim Berners-Lee in 1990.
Q41. Differentiate between Internet and WWW.
Answer: The Internet is a network of networks that connects computers globally and is hardware-based. The WWW is a collection of web pages that allows access to websites and is software-based.
Q42. What is a Website?
Answer: A website is a collection of related web pages stored on a web server. Each page is linked through hyperlinks. An example is www.wikipedia.org.
Q43. Define Hyperlink.
Answer: A hyperlink is a clickable text, image, or button that takes the user to another page or website. For example, clicking a blue underlined word on a webpage can open another site.
Q44. What is a URL (Uniform Resource Locator)?
Answer: A URL is the web address used to access a web page. It includes the protocol, domain name, and path. For example: https://www.example.com/page1.html.
Q45. List the main parts of a URL with examples.
Answer: The protocol shows how data is transferred, e.g., https://. The domain name identifies the website, e.g., www.example.com. The path specifies the page, e.g., /page1.html.
Q46. What is a Search Engine?
Answer: A search engine is a software tool that helps users find information on the Internet. It shows relevant results such as web pages, images, and videos. Examples include Google, Bing, and Yahoo.
Q47. What are the three main functions of a Search Engine?
Answer: The three main functions are Crawling, which finds and reads web pages; Indexing, which stores information in a database; and Ranking, which shows the most relevant results first.
Q48. What can be searched using a Search Engine?
Answer: A search engine can be used to search text, images, videos, news, and maps or locations.
Q49. What is Email (Electronic Mail)?
Answer: Email is a method of sending messages and files over the Internet in seconds. It uses protocols such as SMTP, POP, and IMAP for sending and receiving emails.
Q50. What are the parts of an Email Address?
Answer: An email address has two parts separated by “@”: the username, which identifies the person, and the domain name, which identifies the mail provider. For example: user@gmail.com.
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