CBSE Class 12

Q-1

Which component of data communication represents the physical path through which data travels?

Easy Components of Data Communication

A Transmission Medium

B Sender

C Receiver

D Protocol

Answer: Transmission Medium

Explanation: Transmission medium is the physical path for data transfer.

Q-2

Which of the following is NOT a component of data communication?

Easy Components of Data Communication

A Sender

B Message

C Compiler

D Receiver

Answer: Compiler

Explanation: Compiler is not part of communication system.

Q-3

Which term defines the rate at which data is transmitted?

Easy Measuring Capacity

A Latency

B Bandwidth

C Noise

D Protocol

Answer: Bandwidth

Explanation: Bandwidth determines transmission capacity.

Q-4

Which type of communication allows data transmission in both directions simultaneously?

Easy Types of Data Communication

A Simplex

B Half-duplex

C Full-duplex

D Analog

Answer: Full-duplex

Explanation: Full-duplex allows simultaneous communication.

Q-5

Which switching technique establishes a dedicated path before data transfer?

Medium Switching Techniques

A Circuit Switching

B Packet Switching

C Message Switching

D Frame Switching

Answer: Circuit Switching

Explanation: Circuit switching sets up a dedicated path.

Q-6

Which transmission media uses light signals?

Easy Transmission Media

A Twisted Pair

B Coaxial Cable

C Optical Fiber

D Radio Waves

Answer: Optical Fiber

Explanation: Optical fiber uses light.

Q-7

Which communication mode allows only one-way transmission?

Easy Types of Data Communication

A Simplex

B Half-duplex

C Full-duplex

D Multiplex

Answer: Simplex

Explanation: Simplex allows one-way communication.

Q-8

Which switching technique breaks data into packets?

Medium Switching Techniques

A Circuit Switching

B Message Switching

C Packet Switching

D Signal Switching

Answer: Packet Switching

Explanation: Packet switching divides data into packets.

Q-9

Which of the following is an unguided transmission media?

Easy Transmission Media

A Optical Fiber

B Coaxial Cable

C Radio Waves

D Twisted Pair

Answer: Radio Waves

Explanation: Radio waves are wireless.

Q-10

Which protocol ensures reliable data transfer?

Medium Protocol

A HTTP

B FTP

C TCP

D IP

Answer: TCP

Explanation: TCP ensures reliability.

Q-11

Which term represents delay in data transmission?

Medium Measuring Capacity

A Latency

B Bandwidth

C Throughput

D Signal

Answer: Latency

Explanation: Latency is delay in communication.

Q-12

Which component defines rules of communication?

Easy Protocol

A Protocol

B Message

C Sender

D Medium

Answer: Protocol

Explanation: Protocol defines rules.

Q-13

Which technology belongs to mobile communication?

Easy Mobile Technologies

A Wi-Fi

B Bluetooth

C 4G LTE

D LAN

Answer: 4G LTE

Explanation: 4G LTE is mobile telecom technology.

Q-14

Which type of communication allows both directions but not simultaneously?

Easy Types of Data Communication

A Simplex

B Half-duplex

C Full-duplex

D Analog

Answer: Half-duplex

Explanation: Half-duplex allows both directions one at a time.

Q-15

Which switching method sends entire message at once?

Medium Switching Techniques

A Packet Switching

B Circuit Switching

C Message Switching

D Frame Switching

Answer: Message Switching

Explanation: Message switching sends whole message.

Q-16

Which medium is most immune to noise?

Medium Transmission Media

A Twisted Pair

B Coaxial

C Optical Fiber

D Radio Waves

Answer: Optical Fiber

Explanation: Optical fiber is least affected by noise.

Q-17

Which protocol is used for web browsing?

Easy Protocol

A HTTP

B FTP

C SMTP

D TCP

Answer: HTTP

Explanation: HTTP is used for web.

Q-18

Which mobile technology is faster?

Easy Mobile Technologies

A 2G

B 3G

C 4G

D 1G

Answer: 4G

Explanation: 4G is faster than 2G/3G.

Q-19

Which component encodes data into signals?

Medium Components

A Sender

B Receiver

C Protocol

D Medium

Answer: Sender

Explanation: Sender converts data to signals.

Q-20

Which factor limits communication speed?

Medium Measuring Capacity

A Bandwidth

B Noise

C Latency

D All of these

Answer: All of these

Explanation: All factors affect speed.

Q-21

Which medium uses electromagnetic waves?

Easy Transmission Media

A Radio Waves

B Fiber

C Coaxial

D Twisted Pair

Answer: Radio Waves

Explanation: Radio waves are electromagnetic.

Q-22

Which protocol handles addressing and routing?

Medium Protocol

A TCP

B IP

C HTTP

D FTP

Answer: IP

Explanation: IP handles addressing.

Q-23

Which switching technique is most efficient?

Medium Switching

A Circuit Switching

B Message Switching

C Packet Switching

D Frame Relay

Answer: Packet Switching

Explanation: Packet switching is efficient.

Q-24

Which mobile technology introduced digital communication?

Medium Mobile Technologies

A 1G

B 2G

C 3G

D 4G

Answer: 2G

Explanation: 2G introduced digital.

Q-25

Which medium is cheapest?

Easy Transmission Media

A Twisted Pair

B Fiber

C Coaxial

D Microwave

Answer: Twisted Pair

Explanation: Twisted pair is cheapest.

Q-26

Which protocol is connectionless?

Medium Protocol

A TCP

B UDP

C HTTP

D FTP

Answer: UDP

Explanation: UDP is connectionless.

Q-27

Which communication involves sender and receiver?

Easy Concept

A Data Communication

B Protocol

C Switching

D Medium

Answer: Data Communication

Explanation: Communication requires sender and receiver.

Q-28

Which factor represents actual data transfer rate?

Medium Measuring Capacity

A Bandwidth

B Throughput

C Latency

D Noise

Answer: Throughput

Explanation: Throughput is actual speed.

Q-29

Which technology is used for short-range wireless communication?

Easy Mobile Technologies

A Bluetooth

B 4G

C 5G

D Fiber

Answer: Bluetooth

Explanation: Bluetooth is short-range.

Q-30

Which protocol is used for email sending?

Easy Protocol

A HTTP

B FTP

C SMTP

D TCP

Answer: SMTP

Explanation: SMTP sends emails.

Q-31

A security system sends signals from sensors to a central controller, but only in one direction (sensor → controller). Which communication mode is used?

Easy Types of Data Communication

A Simplex

B Half-duplex

C Full-duplex

D Multiplex

Answer: Simplex

Explanation: Simplex allows one-way communication only.

Q-32

A walkie-talkie allows two users to communicate, but only one can speak at a time. Which mode of communication is this?

Easy Types of Data Communication

A Simplex

B Half-duplex

C Full-duplex

D Analog

Answer: Half-duplex

Explanation: Half-duplex allows both directions but not simultaneously.

Q-33

A company needs highly reliable communication with minimal signal loss over long distances. Which transmission medium should they choose?

Medium Transmission Media

A Twisted Pair Cable

B Coaxial Cable

C Optical Fiber

D Radio Waves

Answer: Optical Fiber

Explanation: Optical fiber provides high speed and low noise.

Q-34

During a video call, both users can speak and listen simultaneously. Which communication mode is being used?

Easy Types of Data Communication

A Simplex

B Half-duplex

C Multiplex

D Full-duplex

Answer: Full-duplex

Explanation: Full-duplex allows simultaneous communication.

Q-35

A telecom provider establishes a dedicated connection between two users before starting a call. Which switching technique is used?

Medium Switching Techniques

A Circuit Switching

B Packet Switching

C Message Switching

D Frame Relay

Answer: Circuit Switching

Explanation: Circuit switching sets up a dedicated path.

Q-36

While browsing the internet, data is broken into smaller packets and sent through different routes. Which technique is used?

Medium Switching Techniques

A Circuit Switching

B Packet Switching

C Message Switching

D Analog Switching

Answer: Packet Switching

Explanation: Packet switching splits data into packets.

Q-37

A network engineer observes that actual data transfer speed is lower than the maximum capacity due to network congestion. Which term describes the actual speed achieved?

Medium Measuring Capacity

A Bandwidth

B Latency

C Throughput

D Noise

Answer: Throughput

Explanation: Throughput is the actual data transfer rate.

Q-38

A student uses Bluetooth to transfer files between two mobile devices. Which type of transmission medium is being used?

Easy Transmission Media

A Guided Media

B Wired Media

C Optical Media

D Unguided Media

Answer: Unguided Media

Explanation: Bluetooth uses wireless (unguided) medium.

Q-39

A server sends data packets without checking if they are received correctly, prioritizing speed over reliability. Which protocol is likely used?

Hard Protocol

A UDP

B TCP

C HTTP

D FTP

Answer: UDP

Explanation: UDP is fast but unreliable.

Q-40

A mobile user experiences faster internet speeds when switching from 3G to 4G. What is the main reason for this improvement?

Medium Mobile Technologies

A Higher bandwidth in 4G

B Lower latency in 3G

C Less noise in 3G

D Better switching in 2G

Answer: Higher bandwidth in 4G

Explanation: 4G provides higher bandwidth and faster data speeds.

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Computer Science

11 Data Communication