Real-Time Operating System 30 Multiple Choice Questions

Questions

1. What is a real-time system?
A) A system that processes data in real-time
B) A system that responds to inputs immediately
C) A system with strict timing constraints
D) All of the above

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Answer: D

2. What is the primary characteristic of hard real-time systems?
A) Timing constraints are flexible
B) Missing a deadline is acceptable
C) Missing a deadline can lead to catastrophic failure
D) None of the above

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Answer: C

3. Which of the following is an example of a soft real-time system?
A) Flight control system
B) Video streaming
C) Medical monitoring system
D) Nuclear power plant

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Answer: B

4. What does "latency" refer to in real-time systems?
A) The time taken to process a request
B) The delay between request and response
C) The time taken to send data over a network
D) All of the above

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Answer: D

5. Which scheduling algorithm is commonly used in real-time systems?
A) Round Robin
B) First Come First Serve
C) Rate Monotonic Scheduling
D) Shortest Job First

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Answer: C

6. What is "deadline" in the context of real-time systems?
A) The time when a task must start
B) The time when a task must be completed
C) The maximum time allowed for a task
D) None of the above

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Answer: B

7. What is a "jitter" in real-time systems?
A) Variability in the timing of task execution
B) A measure of system latency
C) The maximum delay in response
D) None of the above

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Answer: A

8. Which type of system is typically NOT a real-time system?
A) Embedded systems
B) Batch processing systems
B) Control systems
D) Automotive systems

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Answer: B

9. What is the purpose of a "task" in a real-time system?
A) To represent a set of resources
B) To define a specific function to be performed
C) To manage hardware components
D) None of the above

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Answer: B

10. In real-time systems, what does "preemption" mean?
A) Interrupting a currently running task
B) Delaying a task until later
C) Terminating a task immediately
D) Running multiple tasks simultaneously

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Answer: A

11. Which of the following is NOT a characteristic of real-time systems?
A) Predictable response times
B) High throughput
C) Time-constrained operation
D) Minimal latency

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Answer: B

12. What does "scheduling" refer to in real-time systems?
A) Allocating CPU time to tasks
B) Managing memory resources
C) Prioritizing tasks based on deadlines
D) Both A and C

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Answer: D

13. In which scenario would you most likely need a real-time operating system (RTOS)?
A) General-purpose computing
B) Real-time control of a robot
C) Web server management
D) Document editing

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Answer: B

14. What is a "tick" in a real-time system?
A) A unit of time for scheduling tasks
B) A type of clock interrupt
C) A method of measuring latency
D) Both A and B

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Answer: D

15. In real-time systems, what is the purpose of a "task manager"?
A) To handle task creation and termination
B) To allocate system resources to tasks
C) To schedule and prioritize tasks
D) All of the above

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Answer: D

16. What is "response time" in a real-time system?
A) The total time from input to output
B) The time taken to process a task
C) The time from task initiation to task completion
D) None of the above

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Answer: A

17. Which of the following best describes "soft real-time systems"?
A) Systems that can tolerate some missed deadlines
B) Systems that require strict adherence to deadlines
C) Systems that are not time-sensitive
D) Systems that do not perform tasks

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Answer: A

18. In real-time systems, what is "blocking"?
A) Waiting for a resource to become available
B) Stopping a task from executing
C) Terminating a task prematurely
D) None of the above

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Answer: A

19. What is the difference between "hard" and "soft" real-time systems?
A) Hard systems have strict deadlines; soft systems do not
B) Hard systems are faster than soft systems
C) There is no difference
D) Soft systems always miss deadlines

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Answer: A

20. Which of the following is a common application of real-time systems?
A) Automated assembly lines
B) Online shopping websites
C) Data analysis
D) Word processing

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Answer: A

21. What does "task priority" refer to in real-time systems?
A) The order in which tasks are executed
B) The importance of a task relative to others
C) The deadline associated with a task
D) Both A and B

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Answer: D

22. What is the role of "inter-process communication" (IPC) in real-time systems?
A) To allow tasks to share data and signals
B) To prioritize tasks
C) To manage memory
D) None of the above

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Answer: A

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23. In real-time systems, what is "context switching"?
A) The process of saving and restoring task states
B) Switching between different operating systems
C) Changing task priorities
D) None of the above

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Answer: A

24. What does "determinism" mean in the context of real-time systems?
A) Predictable outcomes for given inputs
B) Consistent response times
C) Both A and B
D) None of the above

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Answer: C

25. Which of the following best describes "embedded systems"?
A) Standalone computers
B) Systems designed for specific control tasks
C) General-purpose systems
D) None of the above

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Answer: B

26. What is a "real-time clock" (RTC)?
A) A clock that keeps accurate time
B) A hardware timer that triggers events
C) A clock used for system timekeeping
D) Both A and B

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Answer: D

27. What is "resource contention" in real-time systems?
A) Competition for limited resources
B) Excessive resource usage
C) Low resource utilization
D) None of the above

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Answer: A

28. In the context of real-time systems, what does "throughput" refer to?
A) The number of tasks completed in a given time
B) The response time of the system
C) The total time to process a task
D) None of the above

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Answer: A

29. Which of the following is a common method for analyzing real-time systems?
A) Simulation
B) Profiling
C) Model checking
D) All of the above

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Answer: D

30. What is the main goal of real-time system design?
A) Maximize performance
B) Ensure deadlines are met
C) Minimize resource usage
D) Both B and C

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Answer: B