Wireless Sensor Networks Wsn Set 7

Electronics and Telecommunication Engineering [ENTC]

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This set of Wireless Sensor Networks (WSN) Multiple Choice Questions & Answers (MCQs) focuses on Wireless Sensor Networks Wsn Set 7

Q1 | Since a wireless ad-hoc network is decentralized and its topology is dynamic, each of the wireless nodes must perform its own message __________.
  • forwarding
  • protocols
  • switching
  • range
Answer: forwarding
Q2 | What is the networking device used to forward packets on a packet-switching network?
  • hub
  • lan switch
  • nap
  • router
Answer: router
Q3 | What signal transmission method intersperses message segments from multiple sessions into a single medium?
  • dsss
  • multiplexing
  • modulation
  • fhss
Answer: multiplexing
Q4 | What is the term used to describe the height of a radio wave?
  • frequency
  • amplitude
  • wavelength
  • modulation
Answer: amplitude
Q5 | Which of the RF multiplexing methods uses times slices to carry multiple data streams on a single carrier?
  • fdm
  • fm
  • tdm
  • am
Answer: tdm
Q6 | The general rule of __________ is the inverse-square law, which measures an electromagnetic wave's strength relative to the distance over which it is transmitted.
  • intensity
  • frequency
  • amplitude
  • propagation
Answer: propagation
Q7 | The __________ is designed to radiate the aura of the electromagnetic field created by the electric current.
  • intensity
  • antenna
  • radio
  • phase
Answer: antenna
Q8 | __________ communications mode means that it can both transmit and receive, but only one action at a time.
  • radio
  • multiplexing
  • full duplex
  • half duplex
Answer: half duplex
Q9 | The radio communication spectrum is divided into bands based on ______.
  • frequency
  • cost and hardware
  • transmission media
  • amplitude
Answer: frequency
Q10 | Which of the following is a type of wireless network interference that can originate from a nearby radio wave transmitter?
  • snr
  • rfi
  • emi
  • crosstalk
Answer: rfi
Q11 | What type of interference is emitted by nearby electrical motors, appliances, or faulty connections?
  • snr
  • rfi
  • crosstalk
  • emi
Answer: emi
Q12 | What is the receive signal strength indicator used to measure?
  • the ssid of the access point with the strongest signal.
  • the weakest signal on any channel within the range of an access point.
  • the strongest signal on a particular channel at a specific location.
  • the channel which the least signal to noise ratio.
Answer: the strongest signal on a particular channel at a specific location.
Q13 | What is the measurement used to indicate the amount of interference to a particular location?
  • crosstalk
  • snr
  • rfi
  • emi
Answer: snr
Q14 | Which of these is not true for Time-Division Duplex (TDD)?
  • tdd uses different time slots for transmission and reception paths
  • single radio frequency can be used
  • it increases the battery life of mobile phones
  • a duplexer is required
Answer: it increases the battery life of mobile phones
Q15 | Densor sensor field---------- the odds of detecting a signal source within the range
  • increases
  • decreases
  • not affect
  • independent of
Answer: increases
Q16 | As the number of nodes___________, every node spends almost all of its time forwarding packets of other nodes
  • decreases
  • increases
  • goes down
  • remains same
Answer: increases
Q17 | select the incorrect statement
  • networking allows geographical distribution of the sensor nodes and their placement close to signal sources
  • radio communication is the less expensive operation a node performs in terms of energy usage
  • sensor networks are typically deployed in an adhoc manner
  • wireless communication between nodes utilizes radio links
Answer: radio communication is the less expensive operation a node performs in terms of energy usage
Q18 | select the incorrect statement
  • networking allows geographical distribution of the sensor nodes and their placement close to signal sources
  • radio communication is the most expensive operation a node performs in terms of energy usage
  • sensor networks are typically deployed in an adhoc manner
  • wireless communication between nodes utilizes optical link links
Answer: wireless communication between nodes utilizes optical link links
Q19 | select the incorrect statement
  • networking allows geographical distribution of the sensor nodes and their placement close to signal sources
  • radio communication is the most expensive operation a node performs in terms of energy usage
  • sensor networks are typically deployed in structured manner
  • wireless communication between nodes utilizes radio links
Answer: sensor networks are typically deployed in structured manner
Q20 | Within the coverage range, nodes communication is by__________
  • multicast
  • broadcast
  • both
  • none of above
Answer: broadcast
Q21 | ___________sub-layer manages access to the physical network medium, and its fundamental goal is to reduce or avoid packet collisions in the medium
  • llc
  • physical
  • mac
  • baseband
Answer: mac
Q22 | Following characteristics of wireless sensor networks point to the need for a specialized MAC protocol
  • most sensor nodes are idle much of the time
  • in-network processing can greatly improve bandwidth utilization
  • issues of energy efficiency, scalability and robustness remain paramount
  • all of above
Answer: all of above
Q23 | The main goal of the ___________is to reduce energy waste caused by idle listening, collisions, overhearing and control overhead
  • s-mac protocol
  • ieee802.15.4 standard
  • both
  • ieee802.15.3 standard
Answer: s-mac protocol
Q24 | The S-MAC protocol includes following major component
  • periodic listen and sleep
  • collision avoidance
  • message passing
  • all of above
Answer: all of above
Q25 | The S-MAC protocol includes following major component
  • periodic listen and sleep
  • message passing
  • a and b both
  • none of above
Answer: a and b both
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