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

Compression

Routing

Encoding

Modulation

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

Unidirectional

Simplex

Half-duplex

Full-duplex

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

Star

Mesh

Bus

Ring

4. Which transmission media is immune to electromagnetic interference?

Twisted pair

Coaxial cable

Fiber optic cable

Telephone wire

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

Full-duplex

Bandwidth

Baseband

Multiplexing

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

Half-duplex

Full-duplex

Multiplex

Simplex

7. Which of the following uses synchronous transmission?

Keyboard input

Mouse movement

File transfer over internet

TV remote

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

Short cables

Noise and interference

Background apps

High CPU usage

9. Which of these is a symmetric encryption algorithm?

AES

DSA

ECC

RSA

10. What does protocol mean in data communication?

The time taken to transmit data

A rule for playing games

The type of cable used

A set of rules for data exchange

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

Switch

Modem

Repeater

Router

12. Which device regenerates data to maintain signal strength?

Modem

Repeater

Hub

Switch

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

Error detection

Routing

Flow control

Bandwidth management

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

Data Link

Application

Network

Transport

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

Full-duplex

Uniplex

Half-duplex

Simplex

16. What does modulation mean?

Deleting data

Encrypting signals

Compressing data

Changing a signal to carry data

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

Code Division Multiplexing

Frequency Division Multiplexing

Bit Division Multiplexing

Time Division Multiplexing

18. Which type of communication uses light signals?

Satellite

Microwave

Fiber optic

Radio

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

Telephone

Video call

Walkie-talkie

Keyboard to CPU

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

Coaxial cable

Fiber optic cable

Infrared

Twisted pair cable

21. What is the function of a parity bit?

Checks data accuracy

Encrypts messages

Controls routing

Enhances speed

22. What is a frame in data communication?

A type of storage

A unit of physical data transmission

A power supply

A programming error

23. What is encapsulation in data communication?

Wrapping data with protocol information

Encrypting data

Converting analog to digital

Compressing data

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

To define how software should look

To manage computer memory

To standardize network communication processes

To design operating systems

25. What type of signal is continuous in nature?

Digital

Analog

Serial

Binary

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

Transport

Data Link

Network

Physical

27. What does bandwidth refer to in communication?

Number of devices connected

Range of frequencies available for data transmission

Frequency strength

Signal voltage

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

DNS

TCP/IP

CSMA/CD

SMTP

29. Which unit is used to measure frequency?

Volt

Watt

Hertz

Ohm

30. What is jitter in data communication?

Variation in packet arrival time

Loss of data

Corruption of data

Delay in data

31. What is the full form of ISDN?

Internal Satellite Data Network

International Signal Distribution Network

Integrated Services Digital Network

Internet Speed Data Network

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

Bluetooth

Ethernet

Coaxial Cable

Optical Fiber

33. What is attenuation in data communication?

Increase in bandwidth

Strengthening of network security

Loss of signal strength over distance

Amplification of signals

34. What is handshaking in communication?

Encrypting data

Exchange of signals to establish communication

Disconnecting a device

Logging out of the system

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

Excel

Cable

Printer

CPU

36. Which signal representation is better for noise resistance?

Linear

Sine

Analog

Digital

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

JPEG

HTTP

ASCII

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

Bus

Broadband

Baseband

Bandpass

39. What does CRC stand for in data communication?

Channel Resource Control

Circuit Routing Code

Code Repetition Check

Cyclic Redundancy Check

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

Ohm

Bits per second

Volt

Hertz

41. What is data communication?

The use of a phone to talk to someone

The transfer of books between libraries

Printing data on paper

The transmission of data between devices

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

Switch

Repeater

Router

Hub

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

Network

Transport

Data Link

Session

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

Noise

Delivery

Accuracy

Timeliness

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

Parallel

Serial

Analog

Duplex

46. Which of these is a guided transmission medium?

Infrared

Coaxial cable

Wi-Fi

Bluetooth

47. What is the purpose of error correction?

To detect and fix data transmission errors

To compress data

To increase speed

To avoid hacking

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

Switch with Spanning Tree Protocol

Modem

Repeater

Hub

49. Which device connects two different networks?

Router

Bridge

Switch

Modem

50. Which of the following represents a digital signal?

Sine wave

Frequency shift

Continuous wave

Discrete binary values

Page 3 of 3

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

Lower cost

Faster speed

Shorter range

Better noise resistance

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

Modulation

Switching

Multiplexing

Repeating

53. What does baud rate represent?

Number of packets sent

Number of signal changes per second

Voltage level

Speed of sound

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

Error detection

Managing connections between applications

Modulating signals

Data routing

55. What is latency in a network?

Total number of users

Time delay between request and response

Encryption method

Speed of signal

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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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