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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.
Test Helpful For:	ECAT Entry Test Computer Online Test Interview Questions about Computer All Universities Entrance Test Recruitments Tests

ECAT Computer Science Data Communications Test Online MCQs

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Page 1 of 3

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1. What is data communication?

The transmission of data between devices

The transfer of books between libraries

The use of a phone to talk to someone

Printing data on paper

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

Modulating signals

Managing connections between applications

Data routing

Error detection

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

Bit Division Multiplexing

Frequency Division Multiplexing

Code Division Multiplexing

Time Division Multiplexing

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

Repeating

Switching

Multiplexing

Modulation

5. What is encapsulation in data communication?

Compressing data

Converting analog to digital

Wrapping data with protocol information

Encrypting data

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

Switch

Modem

Repeater

Router

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

Bandwidth management

Routing

Error detection

Flow control

8. Which of these is a symmetric encryption algorithm?

DSA

RSA

AES

ECC

9. What does CRC stand for in data communication?

Channel Resource Control

Circuit Routing Code

Cyclic Redundancy Check

Code Repetition Check

10. What is jitter in data communication?

Delay in data

Variation in packet arrival time

Loss of data

Corruption of data

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

HTTP

ASCII

JPEG

12. Which of the following represents a digital signal?

Sine wave

Frequency shift

Continuous wave

Discrete binary values

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

Hub

Modem

Switch with Spanning Tree Protocol

Repeater

14. Which transmission media is immune to electromagnetic interference?

Fiber optic cable

Coaxial cable

Telephone wire

Twisted pair

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

To design operating systems

To manage computer memory

To standardize network communication processes

To define how software should look

16. 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

17. What is handshaking in communication?

Disconnecting a device

Exchange of signals to establish communication

Encrypting data

Logging out of the system

18. Which unit is used to measure frequency?

Ohm

Volt

Hertz

Watt

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

Printer

CPU

Excel

Cable

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

Data Link

Physical

Network

Transport

21. Which of the following uses synchronous transmission?

TV remote

File transfer over internet

Keyboard input

Mouse movement

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

Transport

Data Link

Session

Network

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

Optical Fiber

Bluetooth

Ethernet

Coaxial Cable

24. Which device regenerates data to maintain signal strength?

Hub

Repeater

Switch

Modem

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

Faster speed

Lower cost

Better noise resistance

Shorter range

Page 2 of 3

26. Which type of communication uses light signals?

Fiber optic

Radio

Satellite

Microwave

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

Hertz

Ohm

Volt

Bits per second

28. What is the function of a parity bit?

Enhances speed

Encrypts messages

Controls routing

Checks data accuracy

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

Bus

Bandpass

Broadband

Baseband

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

Ring

Star

Mesh

Bus

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

Multiplexing

Bandwidth

Baseband

Full-duplex

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

Multiplex

Full-duplex

Simplex

Half-duplex

33. What is the full form of ISDN?

International Signal Distribution Network

Internal Satellite Data Network

Internet Speed Data Network

Integrated Services Digital Network

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

Switch

Repeater

Router

Hub

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

Encoding

Modulation

Routing

Compression

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

Simplex

Half-duplex

Unidirectional

Full-duplex

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

Transport

Data Link

Application

Network

38. What does baud rate represent?

Speed of sound

Number of packets sent

Number of signal changes per second

Voltage level

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

Background apps

High CPU usage

Noise and interference

Short cables

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

Coaxial cable

Fiber optic cable

Twisted pair cable

Infrared

41. What does bandwidth refer to in communication?

Number of devices connected

Frequency strength

Range of frequencies available for data transmission

Signal voltage

42. Which of these is a guided transmission medium?

Coaxial cable

Infrared

Wi-Fi

Bluetooth

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

Uniplex

Half-duplex

Simplex

Full-duplex

44. What type of signal is continuous in nature?

Analog

Digital

Serial

Binary

45. What is latency in a network?

Encryption method

Total number of users

Time delay between request and response

Speed of signal

46. Which signal representation is better for noise resistance?

Digital

Linear

Sine

Analog

47. What is attenuation in data communication?

Amplification of signals

Strengthening of network security

Increase in bandwidth

Loss of signal strength over distance

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

Keyboard to CPU

Video call

Walkie-talkie

Telephone

49. What does modulation mean?

Compressing data

Changing a signal to carry data

Deleting data

Encrypting signals

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

Accuracy

Noise

Delivery

Timeliness

Page 3 of 3

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

SMTP

TCP/IP

DNS

CSMA/CD

52. What is a frame in data communication?

A programming error

A power supply

A type of storage

A unit of physical data transmission

53. Which device connects two different networks?

Switch

Bridge

Modem

Router

54. What is the purpose of error correction?

To increase speed

To avoid hacking

To detect and fix data transmission errors

To compress data

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

Serial

Analog

Duplex

Parallel

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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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Mustansar Khan

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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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Mustansar Khan

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