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.

Q1. What is the most common guided media used for data transmission?
a) Twisted pair
b) Coaxial cable
c) Optical fiber
d) Microwave

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Correct Answer: a) Twisted pair
Explanation: The most common guided media used for data transmission is twisted pair. It is the least expensive and most widely used guided transmission medium. A twisted pair consists of two insulated copper wires arranged in a regular spiral pattern. The twisting helps to reduce noise and interference from external sources. Twisted pair cables are commonly used in telephone lines and local area networks (LANs).

Q2. Which of the following is a type of unguided media?
a) Twisted pair
b) Coaxial cable
c) Optical fiber
d) Radio waves

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Correct Answer: d) Radio waves
Explanation: Unguided media, also known as wireless media, do not require a physical path between the transmitter and the receiver. Radio waves are a type of unguided media that can transmit data through the air without the need for cables or other physical connections. They are commonly used in wireless communication systems, such as mobile phones, Wi-Fi networks, and satellite communication systems.

Q3. What is the primary advantage of using optical fiber for data transmission?
a) Lower cost
b) Higher data transmission speed
c) Greater resistance to interference
d) Easier installation

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Correct Answer: b) Higher data transmission speed
Explanation: The primary advantage of using optical fiber for data transmission is its higher data transmission speed. Optical fibers can transmit data at much higher speeds than twisted pair or coaxial cables, making them ideal for high-speed local area networks (LANs) and long-distance applications. In addition to their high-speed capabilities, optical fibers also offer greater resistance to interference and signal attenuation, allowing for longer transmission distances without the need for signal repeaters.

Q4. Which of the following data transmission modes allows communication in both directions but only one direction at a time?
a) Simplex
b) Half-duplex
c) Full-duplex
d) Asynchronous

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Correct Answer: b) Half-duplex
Explanation: Half-duplex transmission mode allows communication in both directions, but only one direction at a time. This means that data can be transmitted and received, but not simultaneously. Examples of half-duplex communication systems include walkie-talkies and some older computer networks.

Q5. What is the unit used to measure data transmission speed?
a) Hertz (Hz)
b) Bits per second (bps)
c) Bytes per second (Bps)
d) Decibels (dB)

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Correct Answer: b) Bits per second (bps)
Explanation: Data transmission speed is typically measured in bits per second (bps). This unit represents the number of bits (binary digits) transmitted or received per second. Common multiples of bps include kilobits per second (kbps), megabits per second (Mbps), and gigabits per second (Gbps) .

Q6. Which of the following is the fastest media of data transfer?
a) Fiber optic
b) Coaxial cable
c) Twisted pair wire
d) Microwave

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Correct Answer: a) Fiber optic
Explanation: Fiber optic cables are the fastest media of data transfer. They can transmit data at much higher speeds than twisted pair or coaxial cables, making them ideal for high-speed local area networks (LANs) and long-distance applications. In addition to their high-speed capabilities, optical fibers also offer greater resistance to interference and signal attenuation, allowing for longer transmission distances without the need for signal repeaters.

Q7. In digital data transmission, which modulation technique is used to convert digital signals into analog signals?
a) Amplitude modulation (AM)
b) Frequency modulation (FM)
c) Phase modulation (PM)
d) Pulse code modulation (PCM)

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Correct Answer: d) Pulse code modulation (PCM)
Explanation: Pulse code modulation (PCM) is a modulation technique used to convert digital signals into analog signals for transmission over analog communication channels. PCM involves sampling the digital signal at regular intervals and then encoding the amplitude of each sample as a series of binary digits (bits). The resulting bitstream can be transmitted as an analog signal using various modulation techniques, such as amplitude, frequency, or phase modulation.

Q8. Which of the following is a data transmission service that provides a dedicated, point-to-point connection between two devices?
a) Circuit switching
b) Packet switching
c) Frame relay
d) Asynchronous transfer mode (ATM)

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Correct Answer: a) Circuit switching
Explanation: Circuit switching is a data transmission service that provides a dedicated, point-to-point connection between two devices. In circuit-switched networks, a dedicated communication channel is established between the source and destination devices before the actual data transmission begins. This channel remains active for the duration of the communication session and is then released when the session ends. Circuit switching is commonly used in traditional telephone networks.

Q9. Which multiplexing technique combines multiple digital signals into a single signal by assigning each input signal a unique time slot within a fixed time frame?
a) Frequency division multiplexing (FDM)
b) Time division multiplexing (TDM)
c) Code division multiplexing (CDM)
d) Wavelength division multiplexing (WDM)

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Correct Answer: b) Time division multiplexing (TDM)
Explanation: Time division multiplexing (TDM) is a multiplexing technique that combines multiple digital signals into a single signal by assigning each input signal a unique time slot within a fixed time frame. In TDM, the input signals are transmitted sequentially, one after the other, during their assigned time slots. This allows multiple signals to share the same transmission medium without interfering with each other.

Q10. Which type of data transmission involves sending data one bit at a time over a single communication channel?
a) Asynchronous transmission
b) Synchronous transmission
c) Parallel transmission
d) Serial transmission

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Correct Answer: d) Serial transmission
Explanation: Serial transmission involves sending data one bit at a time over a single communication channel. In serial transmission, the bits of a data unit (such as a byte or a word) are transmitted sequentially, one after the other. This type of transmission is commonly used in communication systems where the transmission distance is long or the available bandwidth is limited, as it requires fewer wires and is less susceptible to interference than parallel transmission.

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