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ECAT Computer Science Data Communications Test Online

Mustansar KhanLast Updated: May 1, 2025

ECAT Computer Science Data Communications Test

ECAT Computer Science Chapter 3 Data Communications Online Test

Total Questions:	55
Time Allowed:	25 Minutes
Total Marks:	55
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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ECAT Computer Science Data Communications Test Online MCQs

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

Half-duplex

Multiplex

Full-duplex

Simplex

2. What does baud rate represent?

Number of signal changes per second

Speed of sound

Number of packets sent

Voltage level

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

Excel

Cable

CPU

Printer

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

Accuracy

Timeliness

Noise

Delivery

5. Which of these is a guided transmission medium?

Infrared

Coaxial cable

Bluetooth

Wi-Fi

6. What is attenuation in data communication?

Amplification of signals

Loss of signal strength over distance

Increase in bandwidth

Strengthening of network security

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

Full-duplex

Half-duplex

Unidirectional

Simplex

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

To manage computer memory

To define how software should look

To standardize network communication processes

To design operating systems

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

Transport

Data Link

Network

Physical

10. Which device connects two different networks?

Modem

Bridge

Switch

Router

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

Network

Application

Data Link

Transport

12. What does protocol mean in data communication?

The type of cable used

A rule for playing games

The time taken to transmit data

A set of rules for data exchange

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

Bus

Ring

Mesh

Star

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

Coaxial Cable

Ethernet

Optical Fiber

Bluetooth

15. What does modulation mean?

Compressing data

Changing a signal to carry data

Deleting data

Encrypting signals

16. Which type of communication uses light signals?

Fiber optic

Microwave

Radio

Satellite

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

Session

Transport

Network

Data Link

18. Which of the following represents a digital signal?

Frequency shift

Discrete binary values

Continuous wave

Sine wave

19. What does CRC stand for in data communication?

Channel Resource Control

Code Repetition Check

Circuit Routing Code

Cyclic Redundancy Check

20. What type of signal is continuous in nature?

Analog

Digital

Serial

Binary

21. Which device regenerates data to maintain signal strength?

Modem

Repeater

Switch

Hub

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

Modem

Switch with Spanning Tree Protocol

Repeater

Hub

23. What is the function of a parity bit?

Encrypts messages

Checks data accuracy

Controls routing

Enhances speed

24. What is a frame in data communication?

A type of storage

A unit of physical data transmission

A power supply

A programming error

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

Bandwidth management

Error detection

Routing

Flow control

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

Data routing

Managing connections between applications

Modulating signals

Error detection

27. Which unit is used to measure frequency?

Watt

Ohm

Hertz

Volt

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

Telephone

Walkie-talkie

Keyboard to CPU

Video call

29. Which signal representation is better for noise resistance?

Sine

Digital

Linear

Analog

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

Fiber optic cable

Coaxial cable

Twisted pair cable

Infrared

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

Switch

Repeater

Router

Hub

32. Which of the following uses synchronous transmission?

Keyboard input

TV remote

Mouse movement

File transfer over internet

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

Bit Division Multiplexing

Time Division Multiplexing

Code Division Multiplexing

Frequency Division Multiplexing

34. What is latency in a network?

Total number of users

Encryption method

Time delay between request and response

Speed of signal

35. What is encapsulation in data communication?

Converting analog to digital

Encrypting data

Compressing data

Wrapping data with protocol information

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

Modem

Router

Repeater

Switch

37. What is jitter in data communication?

Loss of data

Delay in data

Variation in packet arrival time

Corruption of data

38. What is handshaking in communication?

Disconnecting a device

Encrypting data

Logging out of the system

Exchange of signals to establish communication

39. Which transmission media is immune to electromagnetic interference?

Fiber optic cable

Twisted pair

Telephone wire

Coaxial cable

40. What is data communication?

Printing data on paper

The transfer of books between libraries

The transmission of data between devices

The use of a phone to talk to someone

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

Bits per second

Ohm

Hertz

Volt

42. What does bandwidth refer to in communication?

Signal voltage

Frequency strength

Range of frequencies available for data transmission

Number of devices connected

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

CSMA/CD

DNS

TCP/IP

SMTP

44. What is the full form of ISDN?

International Signal Distribution Network

Internet Speed Data Network

Integrated Services Digital Network

Internal Satellite Data Network

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

Faster speed

Lower cost

Better noise resistance

Shorter range

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

Serial

Parallel

Analog

Duplex

47. Which of these is a symmetric encryption algorithm?

AES

DSA

RSA

ECC

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

Switching

Multiplexing

Modulation

Repeating

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

Bus

Baseband

Broadband

Bandpass

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

Compression

Routing

Modulation

Encoding

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

Half-duplex

Simplex

Uniplex

Full-duplex

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

Bandwidth

Baseband

Multiplexing

Full-duplex

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

JPEG

HTTP

ASCII

54. What is the purpose of error correction?

To detect and fix data transmission errors

To increase speed

To avoid hacking

To compress data

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

High CPU usage

Background apps

Noise and interference

Short cables

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Mustansar KhanLast Updated: May 1, 2025

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ECAT Computer Science Data Communications Test Online

ECAT Computer Science Data Communications Test

ECAT Computer Science Chapter 3 Data Communications Online Test

ECAT Computer Science Data Communications Test Online MCQs

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