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Computer Data Communications Test Online

Mustansar KhanLast Updated: October 15, 2025

Important Computer Data Communications Question and Answer

Total Questions:	55
Time Allowed:	25 Minutes
Total Marks:	55
How to Attempt Test:	Please choose the right Option in MCQ-type question.
Test Helpful For:	ECAT Entry Test Computer Online Test Interview Questions about Computer All Universities Entrance Test Recruitments Tests

Computer Data Communications Practice Test Online With Explanation

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1. Which of these is a guided transmission medium?

Coaxial cable

Infrared

Wi-Fi

Bluetooth

2. Which of the following is a common cause of data communication errors?

High CPU usage

Background apps

Short cables

Noise and interference

3. What does baud rate represent?

Number of signal changes per second

Speed of sound

Voltage level

Number of packets sent

4. Which type of multiplexing combines signals based on frequency?

Time Division Multiplexing

Bit Division Multiplexing

Frequency Division Multiplexing

Code Division Multiplexing

5. What is data communication?

Printing data on paper

The transmission of data between devices

The use of a phone to talk to someone

The transfer of books between libraries

6. Which of the following is an example of simplex communication?

Telephone

Video call

Keyboard to CPU

Walkie-talkie

7. What is attenuation in data communication?

Loss of signal strength over distance

Amplification of signals

Strengthening of network security

Increase in bandwidth

8. In which mode can data travel in both directions but only one at a time?

Half-duplex

Uniplex

Simplex

Full-duplex

9. Which term is used when multiple devices transmit over a single channel?

Modulation

Repeating

Multiplexing

Switching

10. Which device is used to prevent data packet loops in a network?

Hub

Switch with Spanning Tree Protocol

Modem

Repeater

11. In which layer of the OSI model are routers primarily used?

Physical

Data Link

Transport

Network

12. Which device converts digital signals to analog and vice versa?

Router

Modem

Repeater

Switch

13. What is the main advantage of digital communication over analog?

Shorter range

Faster speed

Better noise resistance

Lower cost

14. Which of the following is not a type of data communication?

Half-duplex

Multiplex

Simplex

Full-duplex

15. What is the unit for measuring data transmission speed?

Ohm

Hertz

Volt

Bits per second

16. What is handshaking in communication?

Disconnecting a device

Exchange of signals to establish communication

Encrypting data

Logging out of the system

17. What is jitter in data communication?

Delay in data

Variation in packet arrival time

Corruption of data

Loss of data

18. Which device regenerates data to maintain signal strength?

Repeater

Hub

Modem

Switch

19. Which device helps increase signal strength over long distances?

Switch

Hub

Router

Repeater

20. Which of the following uses radio waves for communication?

Ethernet

Optical Fiber

Coaxial Cable

Bluetooth

21. What is latency in a network?

Encryption method

Speed of signal

Time delay between request and response

Total number of users

22. Which type of transmission uses multiple data signals on one channel?

Multiplexing

Bandwidth

Full-duplex

Baseband

23. Which of the following uses synchronous transmission?

File transfer over internet

TV remote

Mouse movement

Keyboard input

24. Which layer of the OSI model is responsible for end-to-end communication and error recovery?

Data Link

Transport

Network

Session

25. Which communication method uses frequency range for data transmission?

Bus

Bandpass

Broadband

Baseband

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26. What does modulation mean?

Encrypting signals

Changing a signal to carry data

Compressing data

Deleting data

27. What does CRC stand for in data communication?

Channel Resource Control

Cyclic Redundancy Check

Code Repetition Check

Circuit Routing Code

28. What is a frame in data communication?

A type of storage

A power supply

A programming error

A unit of physical data transmission

29. What is the purpose of the Session Layer in the OSI model?

Data routing

Error detection

Modulating signals

Managing connections between applications

30. Which method is used for collision detection in Ethernet?

DNS

SMTP

CSMA/CD

TCP/IP

31. Which of the following represents a digital signal?

Frequency shift

Sine wave

Continuous wave

Discrete binary values

32. What does protocol mean in data communication?

A set of rules for data exchange

The type of cable used

The time taken to transmit data

A rule for playing games

33. What type of signal is continuous in nature?

Digital

Binary

Serial

Analog

34. Which method is used to represent characters in binary?

JPEG

HTTP

ASCII

35. Which type of communication uses light signals?

Radio

Fiber optic

Microwave

Satellite

36. What is the purpose of error correction?

To compress data

To detect and fix data transmission errors

To avoid hacking

To increase speed

37. What is the full form of ISDN?

Integrated Services Digital Network

International Signal Distribution Network

Internal Satellite Data Network

Internet Speed Data Network

38. Which signal representation is better for noise resistance?

Sine

Linear

Analog

Digital

39. Which of the following is an example of unguided transmission media?

Coaxial cable

Fiber optic cable

Twisted pair cable

Infrared

40. Which of the following ensures that data is sent at a rate the receiver can handle?

Bandwidth management

Error detection

Routing

Flow control

41. Which of the following is an example of a transmission medium?

CPU

Cable

Printer

Excel

42. Which of these refers to communication in both directions simultaneously?

Unidirectional

Half-duplex

Full-duplex

Simplex

43. What is the purpose of the OSI model in data communications?

To define how software should look

To design operating systems

To standardize network communication processes

To manage computer memory

44. What type of network topology is best for minimizing data collision?

Bus

Star

Mesh

Ring

45. Which device connects two different networks?

Modem

Switch

Router

Bridge

46. Which layer of the OSI model handles error detection?

Application

Data Link

Transport

Network

47. Which of these is not a feature of data communication?

Noise

Accuracy

Delivery

Timeliness

48. What is the function of a parity bit?

Enhances speed

Checks data accuracy

Controls routing

Encrypts messages

49. Which of the following data transmission methods sends data one bit at a time?

Serial

Analog

Duplex

Parallel

50. What does bandwidth refer to in communication?

Signal voltage

Number of devices connected

Range of frequencies available for data transmission

Frequency strength

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51. Which transmission media is immune to electromagnetic interference?

Telephone wire

Fiber optic cable

Twisted pair

Coaxial cable

52. Which of these is a symmetric encryption algorithm?

RSA

AES

ECC

DSA

53. Which unit is used to measure frequency?

Volt

Hertz

Ohm

Watt

54. What is encapsulation in data communication?

Encrypting data

Compressing data

Wrapping data with protocol information

Converting analog to digital

55. Which of the following defines the route that data takes from source to destination?

Routing

Compression

Encoding

Modulation

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Mustansar KhanLast Updated: October 15, 2025

Computer Data Communications Test Online

Important Computer Data Communications Question and Answer

Computer Data Communications Practice Test Online With Explanation

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