9th Computer Science Chapter4 Data Communication

Sr #	Questions	A	B	C	D
1	Which communication device is used to extend the range of wireless networks?	Switch	Modem	Access point	Bridge
2	What is a disadvantage of asynchronous transmission compared to synchronous transmission?	Higher error rates	Lower data transfer rates	Greater complexity in implementation	Dependency on a clock signal
3	What does attenuation refer to in the context of transmission impairments?	The strengthening of a signal during transmission	The distortion of a signal due to noise	The loss of signal strength over distance	The delay in signal transmission
4	Which of the following is NOT a commonly used medium in data communication?	Fiber optic cables	Radio waves	Morse code	Twisted pair cables
5	What is a characteristic of guided transmission media?	They are also known as wireless media.	They use electromagnetic waves to transmit data.	They require physical cables or wires to transmit signals.	They are highly susceptible to interference from external sources.
6	Which communication device is responsible for connecting multiple devices within a local area network (LAN)?	Switch	Router	Modem	Hub
7	What is the primary function of a transmitter in a communication system?	To receive incoming messages	To convert the message signal into a suitable form for transmission	To amplify the received signal	To decode the message signal
8	What is the primary difference between asynchronous and synchronous transmission modes?	Asynchronous transmission requires a clock signal, while synchronous transmission does not.	Asynchronous transmission uses start and stop bits, while synchronous transmission does not.	Asynchronous transmission is slower than synchronous transmission.	Asynchronous transmission is only used for digital data, while synchronous transmission can handle analog data as well.
9	In synchronous transmission, how is timing maintained between the sender and receiver?	Through the use of start and stop bits	Through the use of a clock signal	Through the use of error detection codes	Through the use of parity bits
10	What is the purpose of a repeater in a communication system?	To connect multiple devices within a LAN	To extend the range of wireless networks	To amplify and regenerate signals for long-distance transmission	To provide secure access to a network
11	What is the purpose of a transmission medium in a communication system?	To encode the message signal	To amplify the signal	To carry the signal from the transmitter to the receiver	To decode the signal
12	In data communication, what is “parity” used for?	To encode data for transmission	To detect errors in transmitted data	To establish a secure connection	To synchronize devices on a network
13	Which of the following is NOT a typical component of an introduction unit?	Detailed lectures on advanced concepts	Course objectives and learning outcomes	Expectations for student participation	Overview of the course structure and timeline
14	What does “full-duplex” communication mean?	Data can be transmitted in both directions, but not simultaneously.	Data can be transmitted in both directions simultaneously.	Data can only be transmitted in one direction.	Data can be transmitted wirelessly.
15	In a communication system, what role does the receiver play?	It encodes the message signal.	It amplifies the received signal.	It converts the received signal into a form suitable for interpretation.	It generates the message signal.
16	What should students expect to gain from the introduction unit?	Mastery of all course topics	Familiarity with the instructor's teaching style	A comprehensive understanding of the course material	An overview of what will be covered and how the course will be conducted
17	Which component of a communication system is responsible for ensuring that the message reaches the intended destination?	Transmitter	Receiver	Transmission medium	Channel
18	What does the term “channel” refer to in a communication system?	The process of encoding the message signal	The physical medium through which the signal is transmitted	The device that converts the signal from analog to digital	The device that amplifies the signal
19	In a good communication system, what does the term “scalability” refer to?	The ability to handle large amounts of data	The ability to expand or contract in size or capacity according to needs	he speed at which data is transmitted	The security measures in place to protect data
20	What is the primary benefit of including learning outcomes in the introduction unit?	To assess students' prior knowledge	To establish grading criteria	To guide students on what they will achieve by the end of the course	To introduce the instructor's teaching philosophy
21	Which of the following is an example of guided transmission media?	Fiber optic cables	Satellite communication	Microwave transmission	Infrared communication
22	Which of the following best describes the role of the introduction unit in fostering student engagement?	It provides a platform for students to voice their concerns about the course.	It establishes a sense of community among students.	It allows students to demonstrate their proficiency in the subject matter.	It presents a detailed breakdown of each topic covered in the course.
23	What does the term “bit rate” represent in data transmission?	The number of bits transmitted per unit of time	The distance a signal can travel without attenuation	The rate of error correction in the transmitted data	The capacity of the communication channel
24	What is the purpose of a modem in data communication?	To convert digital signals into analog signals for transmission over telephone lines	To encrypt data for secure transmission	To amplify signals for long-distance transmission	To organize data into packets for efficient transmission
25	What does “noise” refer to in a communication channel?	Unintentional signals that interfere with the transmitted data	The capacity of the channel to carry data	The speed at which data is transmitted	The synchronization of devices on a network
26	What is “attenuation” in the context of communication channels?	The variation in signal propagation time	The loss of signal strength over distance	The process of encoding data for transmission	The ability of a channel to carry multiple signals simultaneously
27	Which of the following is NOT a characteristic of a good communication system?	Low latency	High error rate	High throughput	Low jitter
28	What is a key characteristic of an effective communication system?	High cost	Low bandwidth	Reliability	Complexity
29	Which of the following is an example of unguided transmission media?	Twisted pair cables	Coaxial cables	Wireless communication	Optical fibers
30	Which transmission mode is more efficient for high-speed data transfer?	Asynchronous	Synchronous	Both are equally efficient	Neither is suitable for high-speed data transfer
31	What is the primary function of a modem in a communication system?	To convert digital signals into analog signals for transmission over telephone lines	To encrypt data for secure transmission	To amplify signals for long-distance transmission	To organize data into packets for efficient transmission
32	Which type of transmission impairment occurs due to the resistance of the transmission medium?	Attenuation	Delay distortion	Thermal noise	Crosstalk
33	What role does “interoperability” play in a communication system?	It ensures that data is transmitted securely.	It enables different systems or components to communicate and work together seamlessly.	It determines the cost of implementing the system.	It refers to the physical medium used for transmission.
34	What role does a network interface card (NIC) play in a computer system?	It connects the computer to the internet.	It converts digital signals into analog signals.	It provides a physical connection between the computer and the network.	It encrypts data for secure transmission.
35	What is a key advantage of using guided transmission media over unguided transmission media?	Higher data transfer rates	Less susceptibility to interference	Greater flexibility in deployment	Lower cost of implementation
36	Which type of transmission media is commonly used for long-distance communication, such as internet backbone connections?	Guided transmission media	Unguided transmission media	Both guided and unguided transmission media	None of the above
37	In asynchronous transmission, what are start and stop bits used for?	To indicate the beginning and end of a character	To synchronize the transmission with the clock signal	To detect errors in the data	To regulate the speed of transmission
38	What is the purpose of “flow control” in data communication?	To manage the speed of data transmission	To detect errors in transmitted data	To encode data for secure transmission	To establish a physical connection between devices
39	What does the term “protocol” refer to in data communication?	A set of rules governing the exchange of data between devices	The physical medium used to transmit data	The speed at which data is transmitted	The format of the data being transmitted
40	Which of the following is an example of a communication device?	Printer	Scanner	Router	Keyboard
41	What is the purpose of the introduction unit in a course?	To summarize the entire course	To provide an overview of the topics to be covered	To evaluate students' prior knowledge	To introduce the instructor's credentials
42	What are transmission impairments in a communication system?	Conditions that improve the quality of transmitted signals	Factors that enhance the speed of data transmission	Any changes or distortions to the signal during transmission	Components that boost the strength of transmitted signals
43	Which of the following is an example of a transmission impairment?	High signal strength	Low latency	Attenuation	Clear channel
44	What is data communication?	The process of encoding data for secure transmission	The transfer of data between two or more devices via a medium	The encryption of sensitive information for storage	The analysis of data patterns for decision-making
45	What is a “node” in the context of data communication?	A unit of data transmission	A device connected to a network	A type of cable used for data transmission	A form of encryption algorithm
46	What does the term “redundancy” refer to in the context of communication systems?	The ability to recover from errors or failures	The duplication of critical components or functions to ensure reliability	The speed at which data is transmitted	The distance over which data can be transmitted without degradation
47	What is delay distortion in a communication system?	The loss of signal strength over distance	The distortion of a signal due to noise	The variation in signal propagation time for different frequency components	The interference between adjacent signal channels
48	How is “bandwidth” related to the data transmission capacity of a communication channel?	Higher bandwidth indicates slower data transmission.	Higher bandwidth allows for higher data transmission rates.	Bandwidth is unrelated to data transmission capacity.	Bandwidth measures the physical width of the channel.