Sensor Networks – Real-time Systems MCQs

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1. What is the primary purpose of sensor networks in real-time systems?
(A) To store data for offline analysis only
(B) To collect, process, and transmit data from physical environments in a timely manner
(C) To perform batch-only computations
(D) To act as memory storage units

2. A key characteristic of real-time sensor networks is:
(A) CPU idle exclusively
(B) Timely and predictable data delivery
(C) Disk batch-only processing
(D) Memory-only data logging

3. Sensor nodes in a network are typically:
(A) Low-power, resource-constrained devices
(B) High-performance servers
(C) Cloud-only processors
(D) Memory-only devices

4. Wireless sensor networks (WSNs) in real-time systems are used for:
(A) Environmental monitoring, industrial automation, and surveillance
(B) Batch data storage
(C) CPU idle exclusively
(D) Memory-only tasks

5. In real-time sensor networks, data sampling must:
(A) CPU idle exclusively
(B) Meet timing constraints to ensure fresh and relevant information
(C) Disk batch-only capture
(D) Memory-only storage

6. Sensor network communication protocols must ensure:
(A) Memory-only communication
(B) CPU idle exclusively
(C) Disk batch-only transfer
(D) Low-latency and reliable transmission of real-time data

7. Event-driven sensor networks trigger:
(A) Periodic reporting only
(B) CPU idle exclusively
(C) Data transmission or processing when specific conditions occur
(D) Memory-only signaling

8. Real-time scheduling in sensor networks ensures:
(A) Memory-only scheduling
(B) CPU idle exclusively
(C) Disk batch-only tasks
(D) High-priority data is processed and transmitted within deadlines

9. Duty cycling in sensor networks is used to:
(A) Save energy by alternating active and sleep periods
(B) CPU idle exclusively
(C) Disk batch-only operation
(D) Memory-only saving

10. A major challenge in real-time sensor networks is:
(A) Memory-only tasks
(B) CPU idle exclusively
(C) Disk batch-only communication
(D) Meeting deadlines under limited resources and variable network conditions

11. Data aggregation in sensor networks helps to:
(A) Reduce communication overhead and improve efficiency
(B) CPU idle exclusively
(C) Disk batch-only storage
(D) Memory-only processing

12. Synchronization in sensor networks is important for:
(A) Disk batch-only operations
(B) CPU idle exclusively
(C) Coordinating tasks and accurate timestamping of sensor data
(D) Memory-only tasks

13. Multi-hop communication in sensor networks is used to:
(A) CPU idle exclusively
(B) Transmit data from distant nodes through intermediate nodes
(C) Disk batch-only transfer
(D) Memory-only routing

14. Real-time guarantees in sensor networks are often achieved through:
(A) Memory-only allocation
(B) CPU idle exclusively
(C) Disk batch-only transfer
(D) Prioritized scheduling and real-time routing protocols

15. Sensor nodes often include:
(A) Disk batch-only modules
(B) CPU idle exclusively
(C) Sensors, microcontroller, memory, and communication modules
(D) Memory-only storage

16. Reliability in sensor networks is improved by:
(A) CPU idle exclusively
(B) Redundancy, fault-tolerant routing, and error detection
(C) Disk batch-only transmission
(D) Memory-only techniques

17. Sensor networks must handle:
(A) Memory-only updates
(B) CPU idle exclusively
(C) Disk batch-only tasks
(D) Dynamic environmental changes and unpredictable events

18. Real-time sensor network applications include:
(A) Disk batch-only logging
(B) CPU idle exclusively
(C) Industrial control, healthcare monitoring, and disaster response
(D) Memory-only collection

19. Wireless sensor nodes face energy constraints because:
(A) Memory-only devices
(B) CPU idle exclusively
(C) Disk batch-only nodes
(D) They are often battery-powered with limited recharging capability

20. The main advantage of sensor networks in real-time systems is:
(A) CPU idle exclusively
(B) Timely, efficient, and distributed data acquisition and processing
(C) Disk batch-only efficiency
(D) Memory-only storage