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This set of Wireless Sensor Networks (WSN) Multiple Choice Questions & Answers (MCQs) focuses on Wireless Sensor Networks Wsn Set 9

Q1 | An inherent problems with S-MAC is
  • it does not allow sensor nodes to sleep for extensive amounts of time.
  • internal clocks are not present.
  • the internal clock of the nodes are not synchronized.
  • the internal clock of the nodes are synchronized.
Q2 | Timeout-MAC (T-MAC) letting the nodes timeout when nothing happens
  • during their sleep periods.
  • during their active periods.
  • before the active period.
  • after the active period.
Q3 | Berkeley MAC (B-MAC) was developed to tackle the problems of
  • t-mac
  • s-mac
  • lpl
  • all of above
Q4 | Long preamble used in Berkeley MAC (B-MAC) has long preamble consist of
  • application data
  • other payloads
  • has fixed length and may carry sender, receiver, and packet size information
  • has variable length and may carry sender, receiver, and packet size information
Q5 | Long preamble used in Berkeley MAC (B-MAC) has to be send at least for duration of
  • wakeup time
  • less than wakeup time
  • sleeping time
  • less than sleeping time
Q6 | The MAC protocol,
  • guarantee that the transmission will be successful
  • does not guarantee that the transmission will be successful
  • guarantee that the retransmission will be successful
  • none of above
Q7 | incorrect statement is
  • the lower the received signal strength indicator -rssi, better the signal.
  • link quality indicator (lqi) positive number ranging from approximately 110 to 50
  • link quality indicator (lqi) positive number ranging from approximately 0 to 100
  • packet reception ratio measured in fraction
Q8 | The packet reception ratio (PPR) is depicted against the distance
  • at long distance between nodes, the prr increases
  • at short distance between nodes, the prr decreases
  • at long distance between nodes, the prr decreases
  • ppr is independent of distance between nodes
Q9 | In the clear communication zone communication is
  • at least a 90%
  • almost impossible, but interference might still occur.
  • interference free.
  • from almost 100% to 0%
Q10 | The purpose of error control is to
  • guarantee communication is error-free & in-sequence,
  • guarantee communication is duplicate-free, and loss-free
  • guarantee communication is error-free and loss-free
  • a and b both
Q11 | Backward Error Control –
  • should not try to prevent errors but only discover errors.
  • should try to prevent errors
  • should try to prevent errors and avoid discovery of errors
  • none of the above
Q12 | Forward Error Control-
  • should not try to prevent errors but only discover errors.
  • should try to prevent errors only
  • should try to prevent errors and avoid discovery of errors
  • attempts to prevent errors instead of only detecting them
Q13 | Select correct statement for naming
  • name reveal a about the position of the node and its role.
  • name reveal about the position of the node, but not about the role.
  • name does not reveal anything about the position of the node. reveal something about the role.
  • name does not reveal anything about the position of the node as well as its role.
Q14 | Select correct statement for addressing of node
  • address reveal a about the position of the node and its role.
  • address reveal about the position of the node, but not about the role.
  • address does not reveal anything about the position of the node. reveal something about the role.
  • address does not reveal anything about the position of the node as well as its role.
Q15 | Centralized Topology Control
  • is very hard to perform
  • requires significant communication overhead
  • react well in case of changes.
  • all are leading nodes
Q16 | Distributed Topology Control
  • is very simple to perform
  • requires less time to stabilize
  • more flexible, situation-aware
  • less precise than centralized control.
Q17 | What is shadowing?
  • direct signal
  • undirect signal
  • signal strength
  • signal range
Q18 | In wireless distribution system
  • there is no access point
  • there is no repeater in wireless network
  • multiple aps are inter-connected with each other
  • none of the above
Q19 | What device is the wireless equivalent of a wired hub?
  • bridge
  • repeater
  • antenna
  • access-point
Q20 | The type of access used in GSM technology is
  • tdma
  • cdma
  • ofdma
  • none of the above
Q21 | 34. Uplinks are also knowns as
  • reverse link
  • bs link
  • forward link
  • ms link
Q22 | A one-to-all communication between one source and all hosts on a network is classified as a _______ communication.
  • unicast
  • multicast
  • broadcast
  • none of the above
Q23 | A one-to-many communication between one source and a specific group of hosts is classified as a _______ communication.
  • unicast
  • multicast
  • broadcast
  • none of the above
Q24 | A one-to-one communication between one source and one destination is classified as a _______ communication.
  • unicast
  • multicast
  • broadcast
  • none of the above