9th Computer Science Chapter4 Data Communication

Sr #	Questions	A	B	C	D
1	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.
2	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
3	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
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 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
6	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
7	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
8	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
9	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.
10	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
11	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
12	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