Deck 2: Wireless Networking and Sensor Networks

Question 1

Which one of the following frequency bands is used for cordless phones?

A)40 mhz
B)900 mhz
C)75 mhz
D)300 mhz

Answer 1

900 mhz

Question 2

What wireless mode is being used by a student who uses a wireless connection to link to her lab partner's notebook PC in a study hall?

A)ad-hoc
B)infrastructure
C)fixed-base
D)roaming

Answer 2

ad-hoc

Question 3

What is the acronym used to indicate a network that provides support for a single user in a 10-meter range?

A)man
B)can
C)lan
D)pan

Answer 3

pan

Question 4

Ad-hoc mode of wireless network is also known as __________ mode.

A)router
B)roaming
C)infrastructure
D)digital

Question 5

This mode of wireless network allows devices to communicate directly with each other.

A)digital
B)physical
C)ad-hoc
D)infrastructure

Question 6

Each node is equipped with

A)only one sensing device
B)one or more sensing devices
C)only more than one sensing devices
D)no sensing device attached

Question 7

___________routes user queries or commands to appropriate nodes in a sensor network

A)bridge and gateway both
B)bridge only
C)gateway only
D)none of above

Question 8

Communicating 1 bit over the wireless medium at short ranges consumes ___________energy than processing that bit.

A)less
B)more
C)equal
D)can not compare

Question 9

A sensor network is designed to collect information from a___________ environment

A)logical
B)physical
C)logical as well as physical
D)none of above

Question 10

It is more appropriate to address nodes in a sensor network by_____ than by______

A)ip address/physical properties
B)netwok address / ip address
C)ip address / netwok address
D)physical properties/ ip address

Question 11

The challenges we face in designing sensor network systems and applications include

A)limited hardware
B)limited support for networking
C)limited support for software development
D)a, b, and c all included

Question 12

The greatest advantage of networked sensing are in improved___________

A)robustness
B)scalability
C)both
D)not applicable

Question 13

A___________ sensing system is inherently more robust against individual sensor node or link failures, because of redundancy in the network

A)centralized
B)decentralized
C)both
D)not applicable

Question 14

Because of the unique attenuation characteristics of RF signals, _____network provides a significant energy saving over ______network for the same distance

A)single hop/multi hop
B)multi hop / single hop
C)wireless/ wired
D)single hop/ wired

Question 15

Using more nodes increases

A)the cost
B)the power consumption of components
C)neither a nor b
D)a and b both

Question 16

Each sensor has a finite sensing range, determined by the___________ floor of the sensor

A)ground
B)noise
C)ground and noise
D)none of above

Question 17

Once a signal source is inside the sensing range of a sensor, further increasing the sensor density ___________the average distance from a sensor to the signal source, hence improving the SNR

A)decreases
B)increases
C)maintain
D)does not affect

Question 18

A sensor network is designed to perform a set of high level information processing tasks such as

A)detection
B)tracking
C)classification
D)all above

Question 19

application of WSN for Infrastructure protection is

A)traffic, habitat,
B)power grids, water distribution
C)habitat, security
D)responsive environment

Question 20

environmental monitoring is carried out using WSN for

A)multi-target tracking
B)power grids, water distribution
C)traffic, habitat, security
D)appliances, factory, supply chains

Question 21

Following are essential characteristics of current sensor network

A)the nodes have only modest processing power and memory
B)network links and nodes can come and go
C)neither a nor b
D)a and b both

Question 22

select the correct statement

A)what is important to the sensor network is the information the nodes contain, not the nodes themselves
B)in wireless sensor networks, nodes can be destroyed, be asleep or die from malfunction or battery depletion
C)preservation of energy is of paramount concern in wireless sensor network
D)all are correct

Question 23

select the correct statement

A)what is important to the sensor network is the information the nodes contain, not the nodes themselves
B)preservation of energy is of paramount concern in wireless sensor network
C)a and b both
D)neither a nor b

Question 24

select the correct statement

A)in wireless sensor networks, nodes can be destroyed, be asleep or die from malfunction or battery depletion
B)what is important to the sensor network is the information the nodes contain, not the nodes themselves
C)neither a nor b
D)a and b both

Question 25

Network for sensor networks is ____centric but not ______centric

A)node , data
B)data , node
C)node , information
D)link , data