Class 9 Computer Science Chapter 4 Question Answers (SEBA) – Easy & Complete Guide!

Introduction

The internet has transformed the way we communicate, work, and access information. Class 9 Computer Science Chapter 4 in the SEBA syllabus introduces students to the fundamentals of networking and internet technologies. Understanding these concepts is crucial in today’s digital age. This article provides a detailed question-answer guide to help students prepare effectively for exams.

Class 9 Computer Science Chapter 4: SEBA Questions and Answers

1. Fill in the Blanks:

1. The connection structure of a computer network is called network topology.
2. Normally, server computers are more powerful than client computers.
3. An organization that provides an internet connection to its consumers is called an Internet Service Provider (ISP).
4. Based on relevance, search results are ordered in a search engine.
5. The sent section of an email interface contains sent emails.

2. Multiple Choice Questions (MCQs):

1. A network switch is required to form:
   Answer: (A) Star Topology
2. How many cables are required to form a mesh topology of 10 computers?
   Answer: (C) 25
3. Which of the following is NOT a protocol?
   Answer: (C) ISP
4. How many repeaters are required to transfer data up to 400 meters using a twisted-pair cable?
   Answer: (B) 4
5. Normally, unsolicited bulk emails appear in:
   Answer: (D) Spam

3. Short Answer Questions:

1. What is topology? From your understanding, describe which topology will be best to set up a computer network in your school.
   Answer:
   Topology refers to the arrangement of computers and devices in a network. The best topology for a school would be Star Topology, as it allows each computer to be connected to a central switch or server, ensuring easy management, better performance, and reduced risk of complete network failure if one device stops working.
2. Give an example of a URL and describe different sections of it.
   Answer:
   Example: https://www.lessoninfo.in/index.html
   • https:// → Protocol (Secure Hypertext Transfer Protocol)
   • www.lessoninfo.in → Domain name (the website address)
   • /index.html → Webpage or file name on the website
3. What is ranking? How is it related to a search engine?
   Answer:
   Ranking is the position of a website in the search engine results page (SERP). Search engines like Google rank websites based on relevance, keywords, backlinks, and quality of content to show the most useful results to users.
4. What is the use of BCC in an email? Describe with an example.
   Answer:
   BCC (Blind Carbon Copy) allows the sender to send an email to multiple recipients without them seeing each other’s addresses.
   Example: If a teacher wants to send an assignment to all students but doesn’t want them to see each other’s email addresses, they can use BCC.
5. What are the differences between Chat and Video Conferencing?
   Answer:
   • Chat: Text-based communication, where users exchange messages. Example: WhatsApp, Messenger.
   • Video Conferencing: Real-time communication using both audio and video, allowing face-to-face interactions over the internet. Example: Zoom, Google Meet.

4. Short Answer Questions (Additional Questions)

1. What is a computer network?
   Answer:
   A computer network is a system of interconnected devices that communicate with each other to share data, resources, and applications. Examples include LAN, WAN, and MAN.
2. What is the role of a modem in networking?
   Answer:
   A modem (Modulator-Demodulator) converts digital signals from a computer into analog signals for transmission over telephone lines and vice versa. It enables internet access for home and office users.
3. What is the difference between LAN and WAN?
   Answer:
   • LAN (Local Area Network): Covers a small geographical area like a school, home, or office.
   • WAN (Wide Area Network): Covers large areas, such as cities or countries (e.g., the Internet).
4. Explain the importance of a search engine.
   Answer:
   A search engine helps users find relevant information on the internet by indexing and ranking web pages based on keywords, relevance, and quality. Examples: Google, Bing, Yahoo.
5. What is cloud computing?
   Answer:
   Cloud computing is a technology that allows users to store and access data and applications over the internet instead of on a local computer. Examples: Google Drive, Dropbox, OneDrive.

Conclusion

Class 9 Computer Science Chapter 4 introduces students to essential internet concepts, including networking, protocols, and email systems. Mastering these topics will help students build a solid foundation in computer science. By practicing these question-answer sets, students can improve their understanding and excel in exams.