Wireless Sensor Networks Wsn Set 2 MCQs

Q1 | Which one of the following frequency bands is used for cordless phones?

40 mhz

900 mhz

75 mhz

300 mhz

Q2 | 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?

ad-hoc

infrastructure

fixed-base

roaming

Q3 | What is the acronym used to indicate a network that provides support for a single user in a 10-meter range?

man

can

lan

pan

Q4 | Ad-hoc mode of wireless network is also known as __________ mode.

router

roaming

infrastructure

digital

Q5 | This mode of wireless network allows devices to communicate directly with each other.

digital

physical

ad-hoc

infrastructure

Q6 | Each node is equipped with

only one sensing device

one or more sensing devices

only more than one sensing devices

no sensing device attached

Q7 | ___________routes user queries or commands to appropriate nodes in a sensor network

bridge and gateway both

bridge only

gateway only

none of above

Q8 | Communicating 1 bit over the wireless medium at short ranges consumes ___________energy than processing that bit.

less

more

equal

can not compare

Q9 | A sensor network is designed to collect information from a___________ environment

logical

physical

logical as well as physical

none of above

Q10 | It is more appropriate to address nodes in a sensor network by_____ than by______

ip address/physical properties

netwok address / ip address

ip address / netwok address

physical properties/ ip address

Q11 | The challenges we face in designing sensor network systems and applications include

limited hardware

limited support for networking

limited support for software development

a, b, and c all included

Q12 | The greatest advantage of networked sensing are in improved___________

robustness

scalability

both

not applicable

Q13 | A___________ sensing system is inherently more robust against individual sensor node or link failures, because of redundancy in the network

centralized

decentralized

both

not applicable

Q14 | Because of the unique attenuation characteristics of RF signals, _____network provides a significant energy saving over ______network for the same distance

single hop/multi hop

multi hop / single hop

wireless/ wired

single hop/ wired

Q15 | Using more nodes increases

the cost

the power consumption of components

neither a nor b

a and b both

Q16 | Each sensor has a finite sensing range, determined by the___________ floor of the sensor

ground

noise

ground and noise

none of above

Q17 | 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

decreases

increases

maintain

does not affect

Q18 | A sensor network is designed to perform a set of high level information processing tasks such as

detection

tracking

classification

all above

Q19 | application of WSN for Infrastructure protection is

traffic, habitat,

power grids, water distribution

habitat, security

responsive environment

Q20 | environmental monitoring is carried out using WSN for

multi-target tracking

power grids, water distribution

traffic, habitat, security

appliances, factory, supply chains

Q21 | Following are essential characteristics of current sensor network

the nodes have only modest processing power and memory

network links and nodes can come and go

neither a nor b

a and b both

Q22 | select the correct statement

what is important to the sensor network is the information the nodes contain, not the nodes themselves

in wireless sensor networks, nodes can be destroyed, be asleep or die from malfunction or battery depletion

preservation of energy is of paramount concern in wireless sensor network

all are correct

Q23 | select the correct statement

what is important to the sensor network is the information the nodes contain, not the nodes themselves

preservation of energy is of paramount concern in wireless sensor network

a and b both

neither a nor b

Q24 | select the correct statement

in wireless sensor networks, nodes can be destroyed, be asleep or die from malfunction or battery depletion

what is important to the sensor network is the information the nodes contain, not the nodes themselves

neither a nor b

a and b both

Q25 | Network for sensor networks is ____centric but not ______centric

node , data

data , node

node , information

link , data