Aperiodic Tasks – Real-time Systems MCQs

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1. What is an aperiodic task in real-time systems?
(A) A task that executes at fixed intervals
(B) A task that never has a deadline
(C) A task with a fixed priority
(D) A task triggered irregularly or by external events

2. Aperiodic tasks differ from periodic tasks because they:
(A) Execute predictably at regular intervals
(B) Have irregular or unpredictable release times
(C) Always have the shortest execution time
(D) Are never preempted

3. Which scheduling algorithm is commonly used for aperiodic tasks?
(A) Rate Monotonic Scheduling (RMS)
(B) Earliest Deadline First (EDF)
(C) Background or server-based scheduling
(D) Cyclic Executive Scheduling

4. Aperiodic tasks may have:
(A) Fixed periods
(B) Constant priority
(C) No execution time
(D) Relative deadlines or soft deadlines

5. In a system with both periodic and aperiodic tasks, aperiodic tasks are usually scheduled using:
(A) LLF only
(B) RMS only
(C) Dedicated aperiodic servers
(D) Non-preemptive cyclic execution

6. Which is TRUE about aperiodic tasks?
(A) They execute regularly at fixed intervals
(B) Their arrivals are unpredictable
(C) They have infinite execution time
(D) They are never preempted

7. A common method to handle aperiodic tasks in real-time systems is:
(A) Ignoring them completely
(B) Using a background server or polling server
(C) Treating them as periodic tasks
(D) Executing them only after all periodic tasks finish

8. Soft aperiodic tasks:
(A) Must always meet their deadlines
(B) Never execute
(C) Can tolerate some deadline misses
(D) Have fixed periods

9. Aperiodic tasks are common in:
(A) Control systems reacting to external events
(B) Batch processing
(C) Fixed cyclic tasks
(D) Non-real-time systems only

10. Which parameter is NOT critical for aperiodic tasks?
(A) Execution time
(B) Arrival time
(C) Deadline (if soft)
(D) Period

11. In real-time systems, aperiodic tasks may compete with:
(A) Network bandwidth only
(B) Disk I/O only
(C) Memory allocation only
(D) Periodic tasks for CPU time

12. Aperiodic tasks are usually scheduled to:
(A) Always preempt high-priority tasks
(B) Maximize period
(C) Minimize response time
(D) Ignore deadlines

13. Which type of server is used to handle aperiodic tasks in RMS systems?
(A) Cyclic executive
(B) EDF scheduler
(C) LLF scheduler
(D) Polling server

14. Which statement is TRUE about aperiodic tasks?
(A) They have predictable, fixed arrival times
(B) They always execute before periodic tasks
(C) They can arrive randomly and irregularly
(D) They cannot be preempted

15. Aperiodic tasks are particularly challenging in:
(A) Background systems
(B) Soft real-time systems
(C) Non-preemptive batch systems
(D) Hard real-time systems

16. Aperiodic tasks can be handled using:
(A) Only RMS
(B) Dedicated aperiodic servers like polling or sporadic servers
(C) Only LLF
(D) Non-preemptive cyclic scheduling

17. Aperiodic task response time depends on:
(A) CPU availability and priority assignment
(B) Task period only
(C) Task memory usage
(D) Task ID

18. Which of the following is a soft real-time aperiodic task example?
(A) Batch file processing
(B) Flight control task
(C) Periodic sensor reading
(D) User input processing in an embedded system

19. Aperiodic tasks may preempt periodic tasks if:
(A) A dedicated aperiodic server is used
(B) Tasks are non-preemptive
(C) CPU is idle
(D) Periodic tasks are suspended permanently

20. Handling aperiodic tasks is important because:
(A) They never have deadlines
(B) They execute at fixed intervals
(C) They respond to unpredictable external events
(D) They always have the highest priority