CBSE Class 12
Computer Science
11 Data Communication
40
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Q-1
Which component of data communication represents the physical path through which data travels?
Easy
Components of Data Communication
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
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
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
Answer: Full-duplex
Explanation: Full-duplex allows simultaneous communication.
Q-5
Which switching technique establishes a dedicated path before data transfer?
Medium
Switching Techniques
Answer: Circuit Switching
Explanation: Circuit switching sets up a dedicated path.
Q-6
Which transmission media uses light signals?
Easy
Transmission Media
Answer: Optical Fiber
Explanation: Optical fiber uses light.
Q-7
Which communication mode allows only one-way transmission?
Easy
Types of Data Communication
Answer: Simplex
Explanation: Simplex allows one-way communication.
Q-8
Which switching technique breaks data into packets?
Medium
Switching Techniques
Answer: Packet Switching
Explanation: Packet switching divides data into packets.
Q-9
Which of the following is an unguided transmission media?
Easy
Transmission Media
Answer: Radio Waves
Explanation: Radio waves are wireless.
Q-10
Which protocol ensures reliable data transfer?
Medium
Protocol
Answer: TCP
Explanation: TCP ensures reliability.
Q-11
Which term represents delay in data transmission?
Medium
Measuring Capacity
Answer: Latency
Explanation: Latency is delay in communication.
Q-12
Which component defines rules of communication?
Easy
Protocol
Answer: Protocol
Explanation: Protocol defines rules.
Q-13
Which technology belongs to mobile communication?
Easy
Mobile Technologies
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
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
Answer: Message Switching
Explanation: Message switching sends whole message.
Q-16
Which medium is most immune to noise?
Medium
Transmission Media
Answer: Optical Fiber
Explanation: Optical fiber is least affected by noise.
Q-17
Which protocol is used for web browsing?
Easy
Protocol
Answer: HTTP
Explanation: HTTP is used for web.
Q-18
Which mobile technology is faster?
Easy
Mobile Technologies
Answer: 4G
Explanation: 4G is faster than 2G/3G.
Q-19
Which component encodes data into signals?
Medium
Components
Answer: Sender
Explanation: Sender converts data to signals.
Q-20
Which factor limits communication speed?
Medium
Measuring Capacity
Answer: All of these
Explanation: All factors affect speed.
Q-21
Which medium uses electromagnetic waves?
Easy
Transmission Media
Answer: Radio Waves
Explanation: Radio waves are electromagnetic.
Q-22
Which protocol handles addressing and routing?
Medium
Protocol
Answer: IP
Explanation: IP handles addressing.
Q-23
Which switching technique is most efficient?
Medium
Switching
Answer: Packet Switching
Explanation: Packet switching is efficient.
Q-24
Which mobile technology introduced digital communication?
Medium
Mobile Technologies
Answer: 2G
Explanation: 2G introduced digital.
Q-25
Which medium is cheapest?
Easy
Transmission Media
Answer: Twisted Pair
Explanation: Twisted pair is cheapest.
Q-26
Which protocol is connectionless?
Medium
Protocol
Answer: UDP
Explanation: UDP is connectionless.
Q-27
Which communication involves sender and receiver?
Easy
Concept
Answer: Data Communication
Explanation: Communication requires sender and receiver.
Q-28
Which factor represents actual data transfer rate?
Medium
Measuring Capacity
Answer: Throughput
Explanation: Throughput is actual speed.
Q-29
Which technology is used for short-range wireless communication?
Easy
Mobile Technologies
Answer: Bluetooth
Explanation: Bluetooth is short-range.
Q-30
Which protocol is used for email sending?
Easy
Protocol
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
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
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
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
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
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
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
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
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
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
Answer: Higher bandwidth in 4G
Explanation: 4G provides higher bandwidth and faster data speeds.