solution - Computer Network : Physical Layer (Test 1)

Question : What is a major reason for using multiplexing in communication systems?

Solution :
960320260402083015 Correct Answer : To efficiently utilize a single transmission medium

Description -

Computer Network : Physical Layer (Test 1)

Question : Which statement is true about Synchronous Time Division Multiplexing (TDM)?

Solution :
744420260402082920 Correct Answer : Each device gets a fixed time slot even if it has no data

Description -

Computer Network : Physical Layer (Test 1)

Question : In Frequency Division Multiplexing (FDM), multiple signals are transmitted:

Solution :
107220260402082832 Correct Answer : At the same time but different frequencies

Description -

Computer Network : Physical Layer (Test 1)

Question : Which of the following correctly differentiates Multiplexing and Demultiplexing?

Solution :
683420260402082742 Correct Answer : Multiplexing combines signals, Demultiplexing separates them

Description -

Computer Network : Physical Layer (Test 1)

Question : Multiplexing in computer networks follows which communication model?

Solution :
54720260402082652 Correct Answer : Many-to-one

Description -

Computer Network : Physical Layer (Test 1)

Question : Which of the following correctly matches frequency range and medium?

Solution :
866920260402082229 Correct Answer : Microwaves – 1 GHz to 1000 GHz

Description -

Computer Network : Physical Layer (Test 1)

Question : Why is infrared transmission considered more secure compared to other unguided media?

Solution :
258320260402082127 Correct Answer : It cannot penetrate walls

Description -

Computer Network : Physical Layer (Test 1)

Question : Which of the following is a key characteristic of microwave transmission?

Solution :
496320260402082029 Correct Answer : Requires line-of-sight communication

Description -

Computer Network : Physical Layer (Test 1)

Question : Which property makes radio waves suitable for broadcasting?

Solution :
922820260402081947 Correct Answer : Omnidirectional propagation

Description -

Computer Network : Physical Layer (Test 1)

Question : Which of the following correctly defines unguided transmission media?

Solution :
668620260402081820 Correct Answer : Transmission using electromagnetic waves without physical medium

Description -

Computer Network : Physical Layer (Test 1)

Question : Which of the following is a major disadvantage of coaxial cable?

Solution :
867320260402081705 Correct Answer : Failure in one part can affect the entire network

Description -

Computer Network : Physical Layer (Test 1)

Question : Which guided transmission medium uses light signals instead of electrical signals?

Solution :
358620260402081624 Correct Answer : Optical Fiber

Description -

Computer Network : Physical Layer (Test 1)

Question : Why are wires in a twisted pair cable twisted together?

Solution :
894120260402081531 Correct Answer : To reduce electromagnetic interference

Description -

Computer Network : Physical Layer (Test 1)

Question : Which of the following is NOT a type of guided transmission media?

Solution :
669720260402081455 Correct Answer : Microwave

Description -

Computer Network : Physical Layer (Test 1)

Question : Which of the following statements correctly defines guided transmission media?

Solution :
2920260402081102 Correct Answer : Signals are confined within a physical path like cables

Description -

Computer Network : Physical Layer (Test 1)

Question : Which statement is correct regarding wired vs wireless transmission media?

Solution :
715220260402075418 Correct Answer : Wireless media provides more flexibility and mobility

Description -

Computer Network : Physical Layer (Test 1)

Question : Which of the following correctly matches unguided transmission media with its property?

Solution :
533420260402075257 Correct Answer : Microwaves – require line-of-sight alignment

Description -

Computer Network : Physical Layer (Test 1)

Question : Which factor refers to the weakening of a signal over distance in transmission media?

Solution :
312520260402075213 Correct Answer : Attenuation

Description -

Computer Network : Physical Layer (Test 1)

Question : Which of the following is NOT a characteristic of guided (wired) transmission media?

Solution :
521820260402075122 Correct Answer : Signals travel through air or space

Description -

Computer Network : Physical Layer (Test 1)

Question : What is the primary function of transmission media in a computer network?

Solution :
568220260402075027 Correct Answer : To provide a path for data transmission between devices

Description -

Computer Network : Physical Layer (Test 1)

Question : What is the main purpose of quantization in digital transmission?

Solution :
763520260402074835 Correct Answer : To assign discrete values to sampled signals

Description -

Computer Network : Physical Layer (Test 1)

Question : Which of the following is NOT a step in Pulse Code Modulation (PCM)?

Solution :
119520260402074743 Correct Answer : Multiplexing

Description -

Computer Network : Physical Layer (Test 1)

Question : Which technique modifies PAM signals to produce a fully digital signal?

Solution :
450020260402074648 Correct Answer : PCM

Description -

Computer Network : Physical Layer (Test 1)

Question : Why is Pulse Amplitude Modulation (PAM) not directly suitable for digital communication?

Solution :
343820260402074600 Correct Answer : It produces analog pulses instead of digital signals

Description -

Computer Network : Physical Layer (Test 1)

Question : Which of the following processes is responsible for converting a continuous analog signal into discrete digital values?

Solution :
362720260402074508 Correct Answer : Sampling

Description -

Computer Network : Physical Layer (Test 1)

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