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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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1. What is handshaking in communication?

Disconnecting a device

Exchange of signals to establish communication

Encrypting data

Logging out of the system

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

Timeliness

Delivery

Accuracy

Noise

3. Which of the following uses synchronous transmission?

File transfer over internet

Mouse movement

TV remote

Keyboard input

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

Half-duplex

Full-duplex

Unidirectional

Simplex

5. What does modulation mean?

Deleting data

Encrypting signals

Compressing data

Changing a signal to carry data

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

Routing

Compression

Modulation

Encoding

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

Half-duplex

Full-duplex

Simplex

Uniplex

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

Half-duplex

Simplex

Multiplex

Full-duplex

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

Lower cost

Faster speed

Better noise resistance

Shorter range

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

Walkie-talkie

Video call

Keyboard to CPU

Telephone

11. What does CRC stand for in data communication?

Circuit Routing Code

Channel Resource Control

Cyclic Redundancy Check

Code Repetition Check

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

Twisted pair cable

Fiber optic cable

Infrared

Coaxial cable

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

Session

Transport

Data Link

Network

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

Hub

Repeater

Switch

Router

15. Which of these is a symmetric encryption algorithm?

DSA

AES

ECC

RSA

16. What does protocol mean in data communication?

A rule for playing games

The type of cable used

A set of rules for data exchange

The time taken to transmit data

17. What type of signal is continuous in nature?

Serial

Analog

Binary

Digital

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

HTTP

JPEG

ASCII

19. What is latency in a network?

Total number of users

Speed of signal

Time delay between request and response

Encryption method

20. Which device regenerates data to maintain signal strength?

Switch

Repeater

Modem

Hub

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

Duplex

Analog

Parallel

Serial

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

Noise and interference

Short cables

High CPU usage

Background apps

23. What does baud rate represent?

Speed of sound

Number of packets sent

Number of signal changes per second

Voltage level

24. Which of the following represents a digital signal?

Frequency shift

Discrete binary values

Continuous wave

Sine wave

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

Data Link

Transport

Network

Application

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26. What does bandwidth refer to in communication?

Range of frequencies available for data transmission

Frequency strength

Number of devices connected

Signal voltage

27. What is the purpose of error correction?

To compress data

To detect and fix data transmission errors

To increase speed

To avoid hacking

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

Repeater

Router

Switch

Modem

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

Code Division Multiplexing

Time Division Multiplexing

Frequency Division Multiplexing

Bit Division Multiplexing

30. Which device connects two different networks?

Bridge

Modem

Switch

Router

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

Hertz

Ohm

Volt

Bits per second

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

Baseband

Broadband

Bandpass

Bus

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

Modulation

Switching

Repeating

Multiplexing

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

Routing

Error detection

Flow control

Bandwidth management

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

CSMA/CD

SMTP

DNS

TCP/IP

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

Mesh

Bus

Star

Ring

37. What is the function of a parity bit?

Enhances speed

Controls routing

Checks data accuracy

Encrypts messages

38. What is encapsulation in data communication?

Wrapping data with protocol information

Compressing data

Encrypting data

Converting analog to digital

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

Full-duplex

Bandwidth

Multiplexing

Baseband

40. What is data communication?

The transmission of data between devices

Printing data on paper

The use of a phone to talk to someone

The transfer of books between libraries

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

Managing connections between applications

Modulating signals

Error detection

Data routing

42. What is the full form of ISDN?

Internet Speed Data Network

International Signal Distribution Network

Integrated Services Digital Network

Internal Satellite Data Network

43. What is a frame in data communication?

A programming error

A power supply

A type of storage

A unit of physical data transmission

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

To design operating systems

To define how software should look

To standardize network communication processes

To manage computer memory

45. Which unit is used to measure frequency?

Volt

Watt

Ohm

Hertz

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

Modem

Switch with Spanning Tree Protocol

Repeater

Hub

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

Data Link

Physical

Transport

Network

48. Which of these is a guided transmission medium?

Coaxial cable

Infrared

Bluetooth

Wi-Fi

49. What is attenuation in data communication?

Strengthening of network security

Increase in bandwidth

Loss of signal strength over distance

Amplification of signals

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

Optical Fiber

Bluetooth

Coaxial Cable

Ethernet

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

Excel

Cable

CPU

Printer

52. What is jitter in data communication?

Loss of data

Delay in data

Corruption of data

Variation in packet arrival time

53. Which type of communication uses light signals?

Microwave

Satellite

Fiber optic

Radio

54. Which signal representation is better for noise resistance?

Analog

Digital

Linear

Sine

55. Which transmission media is immune to electromagnetic interference?

Fiber optic cable

Coaxial cable

Twisted pair

Telephone wire

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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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