Data Communication and Computer Network

Posted in 8 Computer Science
chapter-10-lecture2-notes

These lecture notes are prepared by Salman Ahmad, who is both a teacher and a web developer. The purpose of this material is to make the topic clear and useful for students of Class 9 Computer Science.

Practice MCQs

1. What is data communication?
a. Storing data in a computer
b. Exchanging data between devices
c. Writing programs
d. Printing documents
Answer: b. Exchanging data between devices
2. Who sends the data in communication?
a. Receiver
b. Sender
c. Decoder
d. Medium
Answer: b. Sender
3. Who receives the data?
a. Sender
b. Encoder
c. Receiver
d. Signal
Answer: c. Receiver
4. What is a message in data communication?
a. Device
b. Data or information being sent
c. Cable
d. Software
Answer: b. Data or information being sent
5. What is transmission media?
a. A type of computer
b. Path through which data travels
c. A programming tool
d. A storage device
Answer: b. Path through which data travels
6. Which of the following is a transmission medium?
a. Keyboard
b. Monitor
c. Optical fiber
d. Printer
Answer: c. Optical fiber
7. What does an encoder do?
a. Receives data
b. Converts data into signals
c. Deletes data
d. Stores data
Answer: b. Converts data into signals
8. What does a decoder do?
a. Sends data
b. Converts signals back into data
c. Connects devices
d. Stores signals
Answer: b. Converts signals back into data
9. Which component is responsible for understanding the message?
a. Sender
b. Receiver
c. Encoder
d. Medium
Answer: b. Receiver
10. What is required for communication to occur?
a. Only sender
b. Only receiver
c. Sender, receiver, and medium
d. Only data
Answer: c. Sender, receiver, and medium
11. Which of the following is NOT a component of data communication?
a. Sender
b. Receiver
c. Compiler
d. Medium
Answer: c. Compiler
12. What form does data take during transmission?
a. Signals
b. Files
c. Images
d. Documents
Answer: a. Signals
13. Which device helps in converting digital data into signals?
a. Decoder
b. Encoder
c. Printer
d. Scanner
Answer: b. Encoder
14. Which medium uses air to transmit data?
a. Wired
b. Wireless
c. Optical
d. Cable
Answer: b. Wireless
15. What is the main purpose of data communication?
a. To store data
b. To share information
c. To delete files
d. To design software
Answer: b. To share information

Test Yourself: Interactive MCQs (Data Communication)

1. Which component starts the communication process?
2. What is the role of the receiver?
3. What is called the information being sent?
4. Which one is an example of wired transmission media?
5. What does an encoder convert data into?
6. Which device converts signals back into original data?
7. Which part carries the data from sender to receiver?
8. Which of the following is NOT a wireless medium?
9. Communication without wires is called:
10. Which process ensures data is understandable at the receiver end?
11. Which component is responsible for sending signals?
12. Which of the following is an example of wireless communication?
13. Data communication requires at least:
14. What is the main job of transmission media?
15. Which component prepares data for transmission?