MCQ on Communications and Networks – Computer GK
Useful and informative MCQ on Communications and Networks – Computer GK that include topics like Communication System, Data Transmission Modes, Data Transmission Speed, Data Transmission Media, Switching Techniques, Routing Techniques, Network Topologies, Network Types, Communication Protocols, Wireless Networks, Internetworking Tools, etc.
These MCQ on Communications and Networks – Computer GK are very helpful for competitive exams such as CPCT, GATE, IES/ESE, IBPS PO, IBPS Clerk, SBI PO, SBI Clerk, RBI, SEBI, LIC, NICL, BCA, B.Sc. IT, DCA, SSC, RRB, NIELIT CCC, CTET, UDC NET, CUET, MCA, PGDCA, MCS, TET, State Police, BPO, etc.
These MCQ on Communications and Networks – Computer GK have correct answers and brief explanations of each question for better understanding.
Q11. Which of the following is a disadvantage of using coaxial cable for data transmission?
a) Lower data transmission speed
b) Susceptibility to interference
c) High cost
d) Limited transmission distance
Show Answer
Correct Answer: b) Susceptibility to interference
Explanation: One disadvantage of using coaxial cable for data transmission is its susceptibility to interference. Although coaxial cables are shielded, they can still be affected by electromagnetic interference (EMI) and radio frequency interference (RFI) from nearby devices or other cables. This can result in signal degradation and reduced data transmission quality. In comparison, optical fibers are immune to EMI and RFI, making them a better choice for environments with high levels of interference.
Q12. What is the primary function of a modem in data communication?
a) To convert digital signals to analog signals and vice versa
b) To amplify the signal strength
c) To provide error detection and correction
d) To route data packets between networks
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Correct Answer: a) To convert digital signals to analog signals and vice versa
Explanation: The primary function of a modem (short for modulator-demodulator) in data communication is to convert digital signals to analog signals and vice versa. Modems are used to enable digital devices, such as computers, to communicate over analog communication channels, such as telephone lines. The modem modulates the digital signal into an analog signal for transmission and demodulates the received analog signal back into a digital signal for processing by the digital device.
Q13. Which of the following is an advantage of digital data transmission over analog data transmission?
a) Lower signal attenuation
b) Greater resistance to noise and interference
c) Higher data transmission speed
d) All of the above
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Correct Answer: d) All of the above
Explanation: Digital data transmission has several advantages over analog data transmission, including lower signal attenuation, greater resistance to noise and interference, and higher data transmission speed. Digital signals can be regenerated at intermediate points along the transmission path, which helps to maintain signal quality and reduce signal attenuation. Digital signals are also less susceptible to noise and interference, as they can be more easily distinguished from unwanted signals. Additionally, digital data transmission can achieve higher data transmission speeds, especially when using advanced modulation and encoding techniques.
Q14. Which of the following is a disadvantage of asynchronous transmission?
a) Higher overhead
b) Lower data transmission speed
c) More complex hardware
d) Greater susceptibility to interference
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Correct Answer: a) Higher overhead
Explanation: A disadvantage of asynchronous transmission is its higher overhead compared to synchronous transmission. In asynchronous transmission, each data unit (such as a byte or a character) is transmitted with additional bits, such as start and stop bits, to indicate the beginning and end of the data unit. These extra bits increase the overhead, which can reduce the effective data transmission rate. Synchronous transmission, on the other hand, uses a continuous stream of data units without the need for start and stop bits, resulting in lower overhead and potentially higher data transmission rates.
Q15. Which of the following is a characteristic of synchronous transmission?
a) Data units are transmitted with start and stop bits
b) Data units are transmitted at regular time intervals
c) Data units are transmitted one bit at a time
d) Data units are transmitted without the need for a common clock signal
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Correct Answer: b) Data units are transmitted at regular time intervals
Explanation: In synchronous transmission, data units are transmitted at regular time intervals. Synchronous transmission relies on a common clock signal between the sender and receiver to ensure that data units are transmitted and received at the same rate. This allows for more efficient use of the available bandwidth and can result in higher data transmission rates compared to asynchronous transmission, which does not use a common clock signal and transmits data units with start and stop bits.
Q16. Which of the following is a type of guided media that uses light to transmit data?
a) Twisted pair
b) Coaxial cable
c) Optical fiber
d) Radio waves
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Correct Answer: c) Optical fiber
Explanation: Optical fiber is a type of guided media that uses light to transmit data. Optical fibers are made of thin strands of glass or plastic that can carry light signals over long distances with minimal signal loss and interference. They offer several advantages over other types of guided media, such as twisted pair and coaxial cables, including higher data transmission speeds, greater resistance to interference, and longer transmission distances without the need for signal repeaters.
Q17. Which of the following is a disadvantage of using twisted pair cables for data transmission?
a) Lower data transmission speed
b) Susceptibility to interference
c) High cost
d) Limited transmission distance
Show Answer
Correct Answer: b) Susceptibility to interference
Explanation: One disadvantage of using twisted pair cables for data transmission is their susceptibility to interference. Twisted pair cables can be affected by electromagnetic interference (EMI) and radio frequency interference (RFI) from nearby devices or other cables, which can result in signal degradation and reduced data transmission quality. In comparison, optical fibers are immune to EMI and RFI, making them a better choice for environments with high levels of interference.
Q18. Which of the following is a type of multiplexing that combines multiple signals with different frequencies into a single signal?
a) Frequency division multiplexing (FDM)
b) Time division multiplexing (TDM)
c) Code division multiplexing (CDM)
d) Wavelength division multiplexing (WDM)
Show Answer
Correct Answer: a) Frequency division multiplexing (FDM)
Explanation: Frequency division multiplexing (FDM) is a type of multiplexing that combines multiple signals with different frequencies into a single signal. In FDM, each input signal is assigned a unique frequency band within the available bandwidth, and the signals are transmitted simultaneously without interfering with each other. FDM is commonly used in analog communication systems, such as radio and television broadcasting.
Q19. Which of the following is a type of data transmission service that divides data into packets and transmits them independently over a shared network?
a) Circuit switching
b) Packet switching
c) Frame relay
d) Asynchronous transfer mode (ATM)
Show Answer
Correct Answer: b) Packet switching
Explanation: Packet switching is a type of data transmission service that divides data into packets and transmits them independently over a shared network. In packet-switched networks, data packets can take different paths to reach their destination, and they are reassembled at the destination to form the original data. Packet switching is more efficient than circuit switching, as it allows multiple communication sessions to share the same network resources simultaneously. It is commonly used in modern computer networks, such as the Internet.
Q20. Which of the following is a type of data transmission mode that allows communication in both directions simultaneously?
a) Simplex
b) Half-duplex
c) Full-duplex
d) Asynchronous
Show Answer
Correct Answer: c) Full-duplex
Explanation: Full-duplex transmission mode allows communication in both directions simultaneously. This means that data can be transmitted and received at the same time, allowing for more efficient use of the available bandwidth and potentially higher data transmission rates. Examples of full-duplex communication systems include telephone conversations and some modern computer networks.
More MCQ on Computer GK for Competitive Exams
- Introduction to Computer
- Basic Computer Organization
- Number Systems
- Computer Codes
- Processor and Memory
- Secondary Storage Devices
- Input and Output Devices
- Computer Software
- Flowchart and Computer Languages
- System Implementation
- Operating Systems
- Application Software Packages
- Business Data Processing
- Communications and Networks
- Internet Concepts and IoT
- Multimedia and File Extensions
- Classification of Computers
- Cyber Safety and Cyber Crime
- Computer Viruses and Security
- Basic Computer Shortcut Keys
- Shortcut Keys for Windows
- Shortcut Keys for MS Excel
- Shortcut Keys for MS Word
- Computer Abbreviations Set 1
- Computer Abbreviations Set 2
- Computer Abbreviations Set 3
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