WorksheetsWireless Sensor Networks Quiz
Total questions: 40
Worksheet time: 20mins
What is the main purpose of a sensor?
Store energy
Transmit sound waves
Convert physical energy to electrical energy
Measure voltage
Which of the following is an example of a biological sensor?
Thermometer
Eyes
Microphone
GPS sensor
What is the role of signal conditioning in sensing systems?
Data encryption
Filtering and amplifying captured signals
Image processing
Reducing file size
Which device converts an analog signal to a digital signal?
DAC
ADC
CPU
Modem
Active sensors require:
No external power
External power supply
Manual triggering
Mechanical input
Which type of sensor uses change in resistance to detect a parameter?
Capacitive sensor
Inductive sensor
Resistive sensor
Piezoelectric sensor
The main purpose of a Wireless Sensor Network (WSN) is to:
Replace wired connections
Monitor physical environments cooperatively
Store large amounts of data
Replace servers
What is the main difference between single-hop and multi-hop communication?
Number of sensors used
Use of relays to forward data
Frequency range
Data rate
Which of the following standards is best suited for low-power WSNs?
IEEE 802.11
IEEE 802.15.4
IEEE 802.3
IEEE 802.16
In WSNs, idle listening refers to:
Sensors overhearing data
Sensors listening when no transmission occurs
Sensors sleeping during data transmission
Repeated data transmission
A sensor node is:
A single large sensor
The basic unit in a wireless sensor network
A device for signal amplification
The same as a base station
What is the main goal of a sensor node?
Encrypt data
Collect, process, and send data
Store information permanently
Manage network routing
Which operating system is specifically designed for WSNs?
Android
TinyOS
iOS
Linux
TinyOS is written in which programming language?
C
Java
NesC
Python
Why are traditional operating systems unsuitable for WSNs?
They are too complex and large
They lack GUI
They are not open-source
They require wired communication
TinyOS uses what kind of task scheduling?
Preemptive
Round Robin
Non-preemptive FIFO
Random
Which of the following is an application of WSNs in environmental monitoring?
Traffic management
Forest fire detection
Smart home control
E-commerce tracking
In water quality monitoring, which parameters are typically measured?
Pressure and velocity
Temperature, turbidity, and pH
Voltage and current
Noise and light
Precision agriculture uses WSNs mainly for:
Monitoring weather only
Applying water and fertilizers precisely where needed
Tracking farm workers
Measuring soil color
In structural health monitoring, WSNs help by:
Painting bridges automatically
Detecting structural weaknesses or vibrations
Reducing maintenance cost directly
Measuring color differences
The main objective of MAC protocols in WSNs is to:
Increase data rate
Minimize collisions and energy waste
Strengthen encryption
Increase node count
Which MAC layer belongs directly above the physical layer in IEEE 802 model?
Network layer
LLC
MAC layer
Transport layer
Contention-free protocols ensure:
All nodes transmit simultaneously
Only one node accesses the medium at a time
High collision rate
Random access
In FDMA, each node is assigned:
A separate frequency band
A separate time slot
A unique code
A MAC address
TDMA assigns:
Power levels
Time slots
Codes
Frequencies
CDMA differentiates transmissions using:
Time
Frequency
Unique codes
Node addresses
What is the role of the “token” in a token passing protocol?
Transmits data
Grants permission to transmit
Stores node information
Encrypts packets
What happens when two nodes transmit at once in ALOHA?
Both succeed
One dominates
A collision occurs and both retry later
Data merges automatically
The hidden terminal problem occurs when:
Nodes are asleep
Two nodes can’t sense each other but transmit to the same receiver
Too many nodes transmit simultaneously
The base station is out of range
The exposed terminal problem can be mitigated using:
Directional antennas
Power control
RTS/CTS handshake
Sleep scheduling
What best describes a wireless sensor network (WSN)?
A network of many spatially distributed sensor nodes that communicate wirelessly and cooperate to monitor an environment.
A single sensor node with an unlimited power source that monitors a small area.
A cellular network of mobile phones used for sensing environmental data.
A wired network of sensors connected by cables to a central server.
Which type of sensor requires an external power source to actively emit energy for detection?
Active sensor
Passive sensor
Capacitive sensor
Piezoelectric sensor
Which IEEE standard was specifically developed for low-power, low-data-rate wireless sensor networks?
IEEE 802.3
IEEE 802.11
IEEE 802.15.4
IEEE 802.15.1
In a WSN using a mesh (multi-hop) topology, what is an advantage over a star (single-hop) topology?
Each sensor node can transmit over shorter distances by relaying data, thus saving energy.
The base station is not needed when a mesh topology is used.
No routing protocol is required in a multi-hop network.
A mesh network eliminates the need for any intermediate relay nodes.
Which of the following is an example of a contention-free medium access control protocol for WSNs?
ALOHA
CSMA/CA
TDMA
CSMA/CD
Which of these is a major challenge in the design of wireless sensor networks?
Limited energy resources available to sensor nodes
Excessive processing power at each sensor node
Unlimited communication bandwidth in wireless links
Permanently stable network topology with no node failures
Which statement about TinyOS, an operating system for sensor networks, is correct?
It uses a component-based architecture and an event-driven execution model.
It employs a multithreaded, preemptive kernel to achieve concurrency.
It requires a large memory footprint to support its functionality.
It was not specifically designed for wireless sensor networks.
Which of the following is an example of an environmental monitoring application of WSNs?
Forest fire detection
Tracking of enemy vehicles on a battlefield
Monitoring the structural integrity of a bridge
Detecting hardware failures in a data center
Which type of sensor operates by measuring changes in electrical capacitance due to physical phenomena?
Capacitive sensor
Resistive sensor
Inductive sensor
Piezoelectric sensor
The concept of “Smart Dust” – tiny, millimeter-scale wireless sensor nodes – originated from which of the following?
A project at the University of California, Berkeley
A DARPA program in the 1970s
The IEEE 802.15.4 standards group
The MIT μAMPS project
