WorksheetsWireless Sensor Networks
Total questions: 87
Worksheet time: 43mins
WSN concept is the network of devices that connected together in order to share and gather information
True
False
Sensor Network is ____________
Heterogeneous system consisting of tiny sensors
Homogeneous system used in wireless
Very important for security
All of the mentioned
Which of the following is/are essential components of a sensor node?
Sensing unit
Processing unit
Transmitting unit
All of the mentioned
What is the main function of a sensor in a smart object?
Control actuators
Sense and measure the environment
Generate power
Provide communication
What is the purpose of an actuator in a smart object?
Control sensors
Interact with the environment
Generate data
Sense the environment
What is a common communication pattern in wireless sensor networks?
Random data bursts
Static data transmission
Event-driven transmission
Continuous streaming of data
What is the purpose of data aggregation in wireless sensor networks?
Increase data transmission
Reduce overall traffic
Improve power consumption
Enhance sensor accuracy
What is a critical requirement for communication protocols in wireless sensor networks?
Limited scalability
High transmission speeds
Low power consumption
Standardization
What is a key advantage of deploying large numbers of smart objects in wireless sensor networks?
Decreased fault tolerance
Increased reliability
Shortened network life
Reduced access to services
Which of the following is an advantage of wireless sensor networks?
Higher transmission speeds
More complex scaling
Greater deployment flexibility
Increased security
What is an event-driven communication pattern?
Transmission occurs at regular intervals
Triggered by a specific event
Always active communication
Requires constant power supply
What is a key consideration for communication protocol selection?
Number of actuators
Scalability to a large number of nodes
Type of environment only
Cost of sensors
What is a characteristic of heterogeneous sensor networks?
All sensors are identical
Mix of cheap and expensive sensors
Only single-purpose networks
Only expensive sensors are used
What does self-organization in wireless sensor networks refer to?
Elimination of nodes
Automatic arrangement of nodes
Static node placement
Manual configuration of nodes
What is the purpose of communication protocols in sensor networks?
To facilitate routing and message handling
To reduce data processing
To increase power consumption
To limit the number of nodes
Which of the following is a feature of self-healing in sensor networks?
Automatic repair of network issues
Increased power consumption
Manual intervention required
Permanent node failure
What is a common application of temperature sensors?
Sound detection
Weather monitoring
Motion sensing
Light measurement
Ad hoc wireless networks is a category of wireless network which has a feature of ___________ network.
Infrastructure less
centralized control
single hop
Circuit switched network
Energy efficiency in WSNs is critical because:
Nodes have unlimited energy sources.
Nodes are often battery-powered with limited energy.
Nodes are powered by renewable energy sources.
Energy is not a constraint in WSNs.
What is the primary requirement for communication in WSNs?
High-speed data transfer
Low latency
Energy-efficient protocols
Large data packet size
Which of the following is a characteristic of WSNs?
High memory capacity
Multi-hop communication
Infinite bandwidth
Complex deployment
What is a major requirement for WSN nodes?
High processing power
Low energy consumption
Unlimited storage
High latency
Which mechanism is essential for handling failures in WSNs?
Centralized fault management
Fault-tolerant mechanisms
Redundant bandwidth
Increased node density
Why is data aggregation important in WSNs?
To increase data redundancy
To reduce energy consumption by minimizing data transmission
To enhance data complexity
To eliminate faulty nodes
Which of the following is NOT an application of WSNs?
Environmental monitoring
Structural health monitoring
Video streaming for entertainment
Precision agriculture
What is a common use of WSNs in smart cities?
Surveillance systems
Weather forecasting
Traffic monitoring and management
Space exploration
Which one of the following is not a component of sensor node
Microcontroller
Transistor
External memory
Power Source
Which one of the following is not the features of WSN
In WSN the data moves from many nodes to the Gateway
No unique id is used in the network
Unique id is used in the network
None of these
Which of the following classifications best describes sensors based on their power supply?
Passive and active sensors
Analog and digital sensors
Contact and non-contact sensors
Wireless and wired sensors
What characteristic defines the smallest change a sensor can detect in its input?
Sensitivity
Resolution
Accuracy
Drift
Which type of sensor detects the presence or absence of an object without physical contact?
Temperature sensor
Proximity sensor
Pressure sensor
Force sensor
How are sensors classified based on their output signal?
Passive and active sensors
Contact and non-contact sensors
Analog and digital sensors
Internal and external sensors
Which type of sensor works based on the piezoelectric effect?
Temperature sensor
Pressure sensor
Ultrasonic sensor
Optical sensor
Which type of sensor measures temperature?
Accelerometer
Thermistor
Gyroscope
Proximity sensor
Which sensor is used to detect motion?
Light sensor
Pressure sensor
PIR (Passive Infrared) sensor
Humidity sensor
What does an accelerometer measure?
Temperature
Acceleration forces
Light intensity
Sound levels
Which sensor is commonly used to measure humidity?
Hygrometer
Barometer
Anemometer
Photometer
What is the role of an actuator in an IoT system?
To sense environmental data
To perform actions based on received data
To store data
To provide user interfaces
Which of the following is an example of an actuator?
Temperature sensor
Light bulb
Humidity sensor
Pressure sensor
What type of actuator is used to control rotational motion?
Solenoid
Servo motor
Piezoelectric actuator
Linear actuator
How can the use of sleep scheduling help in improving energy efficiency in WSN?
By reducing the number of nodes in the network
By using higher power consumption modes for longer periods of time
By allowing nodes to enter low-power sleep modes when not in use, reducing overall energy consumption.
By increasing the data transmission rate between nodes
What are some common techniques used to reduce energy consumption in WSN?
Constantly keeping all nodes active
Increasing data transmission
Data aggregation, duty cycling, and using energy-efficient protocols
Using outdated and inefficient protocols
Why is energy efficiency important in WSN?
To have no impact on the network lifetime or battery replacements.
To prolong the network lifetime and reduce the need for frequent battery replacements.
To increase the network lifetime and require more frequent battery replacements.
To decrease the network lifetime and increase the need for frequent battery replacements.
What is the main principle of a Wireless Sensor Network?
Using a network of sensors to transmit data through cables
Collecting data from the environment using a network of sensors and transmitting it through radio signals
Using a network of sensors to collect data from the environment and transmitting it through satellite communication
Collecting data from the environment using a network of sensors and transmitting it wirelessly
Explain the principle of Wireless Sensor Network in simple words.
A network of sensors that communicate through landline phones to collect and transmit data from the environment.
A network of sensors that communicate through carrier pigeons to collect and transmit data from the environment.
A network of sensors that communicate through smoke signals to collect and transmit data from the environment.
A network of sensors that communicate wirelessly to collect and transmit data from the environment.
How would you describe the challenges in wireless sensor networks to a friend?
Energy efficiency, data security, network scalability, and communication reliability
Size of the sensors
Number of sensors in the network
Color of the sensors
How does a wireless sensor network compare to an ad hoc network?
Wireless sensor networks are only used for military applications
Ad hoc networks are designed for specific applications, while wireless sensor networks are more general-purpose
Wireless sensor networks are more expensive than ad hoc networks
Wireless sensor networks are designed for specific applications, while ad hoc networks are more general-purpose.
What are the key components of node architecture and network architecture in a wireless sensor network?
Sensor, processor, memory, transceiver, power supply, sink, base station, gateway
Keyboard, mouse, monitor, printer, scanner
Camera, microphone, speaker, projector, amplifier
Antenna, satellite, router, modem, ethernet cable
Explain the difference between node architecture and network architecture in wireless sensor networks.
Node architecture focuses on network communication, while network architecture focuses on individual sensor nodes.
Node architecture and network architecture are the same thing in wireless sensor networks.
Node architecture is only concerned with hardware, while network architecture is only concerned with software.
Node architecture focuses on individual sensor nodes, while network architecture focuses on the overall network communication structure.
What are the design principles that are important in the context of wireless sensor networks?
Fundamental design principles such as energy efficiency, scalability, robustness, and self-organization.
Colorfulness, flexibility, adaptability, and complexity
Durability, aesthetics, portability, and connectivity
Speed, size, weight, and cost
How does node density differ between WSNs and traditional networks?
WSNs have a higher number of nodes compared to traditional networks
Both have the same density
WSNs have fewer nodes than traditional networks
Density depends only on the type of network layout
What are the three core parts of a sensor node?
Input, processing, and output
Sensing, processing, and communication
Sensor, actuator, and communication
Memory, power, and actuator
Which type of sensor is best for measuring temperature in WSNs?
Passive sensor
Active sensor
Transceiver
Microcontroller
What is the main purpose of time synchronization in WSNs?
To reduce memory usage
To allow sensor nodes to work together efficiently
To extend battery life
To assign a unique ID to each node
Which time synchronization method saves the most energy?
Reference Broadcast Synchronization (RBS)
Network Time Protocol (NTP)
Glossy Synchronization
Flooding Time Synchronization Protocol (FTSP)
How does multi-hop communication affect energy usage in WSNs?
It shortens network lifespan
It helps save energy
It causes more node failures
It makes the network less scalable
What power-saving method is commonly used in WSNs?
Keeping all nodes active all the time
Turning nodes on and off in cycles (duty cycling)
Increasing power for better signal strength
Using extra nodes to share the load
What is the biggest benefit of processing data within WSNs before sending it?
Reducing unnecessary data transmission
Increasing power consumption
Making the network denser
Adding complexity to sensor hardware
What happens when too many sensor nodes are placed close together?
The network slows down
More data collisions occur
The network becomes more reliable
Less energy is used
Which type of network synchronization requires very precise timekeeping?
Forest fire detection
Smart home automation
Industrial process monitoring
Agricultural temperature tracking
What factor most affects time synchronization accuracy in WSNs?
Network layout
Temperature changes affecting clock speed
Speed of data transmission
Number of base stations
What happens if a sensor node fails in a self-healing WSN?
The entire network stops working
Nearby nodes take over and reroute data
All nodes shut down
The failed node consumes more power
Which type of synchronization uses a network of time servers?
RBS
NTP
TDP
FTSP
Which factor limits the battery life of a WSN node the most?
Memory size
Processing speed
Frequent data transmission
Data storage
What kind of network structure works best for large WSNs?
Star topology
Cluster-based structure
Single-layer architecture
Bus topology
What is the biggest challenge in keeping a WSN running for a long time?
Unlimited battery life
Frequent topology changes
Large memory availability
Low data redundancy
Which factor makes scalability difficult in WSNs?
Unlimited energy supply
Need for precise time synchronization
High processing power in nodes
A fixed number of nodes
What is the main function of a cluster head in a WSN?
Collecting and combining data before sending it to the base station
Increasing the energy of all sensor nodes
Ensuring all nodes stay active continuously
Transmitting data directly to every node
Which of the following best describes data aggregation in WSNs?
Combining data from multiple nodes to reduce redundancy
Increasing the number of transmissions to improve accuracy
Sending all raw data directly to the base station
Ignoring unnecessary sensor data
What is the main advantage of multi-hop communication in WSNs?
Reduces energy usage by breaking long transmissions into shorter ones
Increases the need for more base stations
Requires nodes to transmit data at full power
Avoids any delay in data transmission
Which of the following is an example of a passive sensor?
Radar
Infrared motion detector
Microphone
Ultrasonic sensor
Which type of architecture is best for managing large-scale WSN deployments?
Fully connected mesh
Star topology
Cluster-based structure
Ring topology
What happens when time synchronization is inaccurate in WSNs?
Nodes cannot coordinate actions properly
Network lifetime increases
Data transmission speeds up
Energy usage decreases
Which type of routing is more energy-efficient in large WSNs?
Single-hop direct transmission
Multi-hop clustered routing
Broadcast flooding
Using wired connections between nodes
Which factor causes delays in time synchronization within WSNs?
Asymmetric communication delays
The number of nodes in the network
The processing power of the base station
The frequency of data aggregation
Which of the following statements is true about active sensors?
They have a built-in power source to generate signals
They only detect existing environmental signals
They do not require any external power
They store energy for future use
Which factor directly influences how WSN nodes adjust their internal clocks?
Phase noise in clock signals
The number of nodes in the network
Data storage size in each node
The presence of a backup battery
What is the effect of using mobile nodes in WSNs?
Reduces routing complexity
Increases energy efficiency
Improves network scalability
Simplifies synchronization
What is the main benefit of applying data aggregation techniques in WSNs to improve efficiency?
Increased transmission power
Reduced data redundancy
Increased computational load
Higher energy consumption
What is the trade-off in selecting a high-power versus low-power transceiver for WSN nodes?
High-power increases range but reduces energy efficiency
High-power reduces transmission range
Low-power increases interference
Low-power nodes consume more energy
What is the failure impact of centralized and distributed WSN architectures?
Centralized architecture has lower fault tolerance
Distributed architecture is more prone to failure
Both architectures have equal failure rates
WSNs do not experience failures
What is the method to enhance security in a WSN?
Use stronger antennas
Implement lightweight encryption algorithms
Increase node density
Reduce communication range
What is the communication mode used in WSNs?
Point-to-point
Centralized
Broadcast
Circuit-switched
What is the difference between WSNs and Ad-hoc networks based on node identifiers?
WSNs use unique IDs, Ad-hoc networks do not
WSNs do not use unique IDs, Ad-hoc networks do
Both use unique IDs
Neither use unique IDs
Which is the best architecture for a WSN where sensor nodes need to transmit data over long distances?
Star topology
Layered architecture
Bus topology
Fully connected mesh
What is the primary factor limiting the battery life of a sensor node?
Memory size
Computational speed
Communication overhead
Data storage capacity
What is the difference between RBS and traditional time synchronization protocols?
RBS synchronizes receivers instead of sender-receiver pairs
RBS uses a central clock to synchronize all nodes
RBS assigns unique timestamps to every sensor node
RBS is only applicable in wired networks
