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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 does bandwidth refer to in communication?

Frequency strength

Range of frequencies available for data transmission

Number of devices connected

Signal voltage

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

Hub

Repeater

Router

Switch

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

ASCII

JPEG

HTTP

4. What is attenuation in data communication?

Increase in bandwidth

Loss of signal strength over distance

Strengthening of network security

Amplification of signals

5. Which device regenerates data to maintain signal strength?

Switch

Hub

Repeater

Modem

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

Better noise resistance

Faster speed

Shorter range

Lower cost

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

Modem

Hub

Repeater

Switch with Spanning Tree Protocol

8. What does protocol mean in data communication?

The time taken to transmit data

The type of cable used

A set of rules for data exchange

A rule for playing games

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

Uniplex

Simplex

Full-duplex

Half-duplex

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

SMTP

DNS

CSMA/CD

TCP/IP

11. What is the purpose of error correction?

To detect and fix data transmission errors

To avoid hacking

To increase speed

To compress data

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

Multiplexing

Switching

Modulation

Repeating

13. What is the full form of ISDN?

International Signal Distribution Network

Integrated Services Digital Network

Internet Speed Data Network

Internal Satellite Data Network

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

Baseband

Bus

Broadband

Bandpass

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

Excel

CPU

Cable

Printer

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

Transport

Network

Session

Data Link

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

Error detection

Routing

Bandwidth management

Flow control

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

To manage computer memory

To standardize network communication processes

To define how software should look

To design operating systems

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

Noise and interference

Short cables

High CPU usage

Background apps

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

Coaxial cable

Twisted pair cable

Fiber optic cable

Infrared

21. 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

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

Unidirectional

Full-duplex

Half-duplex

Simplex

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

Managing connections between applications

Data routing

Modulating signals

Error detection

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

Bit Division Multiplexing

Time Division Multiplexing

Code Division Multiplexing

Frequency Division Multiplexing

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

Hertz

Ohm

Bits per second

Volt

Page 2 of 3

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

Data Link

Network

Physical

Transport

27. Which signal representation is better for noise resistance?

Analog

Digital

Sine

Linear

28. Which of the following represents a digital signal?

Sine wave

Continuous wave

Discrete binary values

Frequency shift

29. What is jitter in data communication?

Loss of data

Delay in data

Corruption of data

Variation in packet arrival time

30. What is encapsulation in data communication?

Converting analog to digital

Encrypting data

Wrapping data with protocol information

Compressing data

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

Duplex

Serial

Analog

Parallel

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

Telephone

Keyboard to CPU

Walkie-talkie

Video call

33. Which of these is a guided transmission medium?

Infrared

Wi-Fi

Coaxial cable

Bluetooth

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

Switch

Repeater

Router

Modem

35. Which of these is a symmetric encryption algorithm?

RSA

AES

DSA

ECC

36. Which device connects two different networks?

Router

Bridge

Modem

Switch

37. What does baud rate represent?

Number of packets sent

Speed of sound

Number of signal changes per second

Voltage level

38. What is a frame in data communication?

A programming error

A type of storage

A power supply

A unit of physical data transmission

39. What does modulation mean?

Deleting data

Compressing data

Changing a signal to carry data

Encrypting signals

40. What does CRC stand for in data communication?

Code Repetition Check

Channel Resource Control

Circuit Routing Code

Cyclic Redundancy Check

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

Multiplexing

Bandwidth

Baseband

Full-duplex

42. What is the function of a parity bit?

Controls routing

Checks data accuracy

Enhances speed

Encrypts messages

43. Which type of communication uses light signals?

Satellite

Microwave

Radio

Fiber optic

44. Which transmission media is immune to electromagnetic interference?

Coaxial cable

Fiber optic cable

Telephone wire

Twisted pair

45. What is latency in a network?

Encryption method

Total number of users

Speed of signal

Time delay between request and response

46. What type of signal is continuous in nature?

Digital

Analog

Serial

Binary

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

Ethernet

Coaxial Cable

Optical Fiber

Bluetooth

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

Mesh

Ring

Bus

Star

49. Which unit is used to measure frequency?

Hertz

Ohm

Watt

Volt

50. What is handshaking in communication?

Exchange of signals to establish communication

Disconnecting a device

Logging out of the system

Encrypting data

Page 3 of 3

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

Modulation

Encoding

Compression

Routing

52. Which of the following uses synchronous transmission?

Keyboard input

TV remote

Mouse movement

File transfer over internet

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

Accuracy

Noise

Timeliness

Delivery

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

Data Link

Application

Transport

Network

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

Simplex

Half-duplex

Full-duplex

Multiplex

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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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