1. What is the primary purpose of WCET analysis in real-time systems?
(A) To determine the maximum time a task can take to execute
(B) To calculate CPU idle time
(C) To reduce task priority
(D) To ignore deadlines
2. WCET is critical for which type of tasks?
(A) Hard real-time tasks
(B) Soft real-time tasks only
(C) Background tasks
(D) Aperiodic tasks only
3. Which factor affects WCET of a task?
(A) CPU idle time only
(B) Task name only
(C) Task code complexity, hardware architecture, and scheduling
(D) File system speed
4. Static WCET analysis involves:
(A) Analyzing code and control flow without executing it
(B) Running tasks multiple times to measure time
(C) Ignoring deadlines
(D) Using batch processing only
5. Measurement-based WCET analysis involves:
(A) Using only software timers
(B) Analyzing code without execution
(C) Ignoring task priorities
(D) Running the task on actual hardware and recording execution times
6. WCET analysis is essential for:
(A) Ensuring task deadlines are met in real-time systems
(B) Increasing CPU idle time
(C) Reducing memory usage only
(D) Batch processing only
7. Which hardware factor can influence WCET?
(A) Task names only
(B) Cache, pipeline, and branch prediction
(C) Disk usage only
(D) File system structure
8. Which scheduling analysis uses WCET?
(A) Desktop multitasking
(B) Only batch scheduling
(C) Rate Monotonic Scheduling (RMS) and Earliest Deadline First (EDF)
(D) File system operations
9. Overestimating WCET can lead to:
(A) Deadline misses
(B) Underutilized CPU and wasted resources
(C) Task failure
(D) Increased task periods automatically
10. Underestimating WCET can result in:
(A) Missed deadlines and system failure
(B) Reduced CPU overhead only
(C) Increased idle time
(D) Task period increase automatically
11. Which software factor affects WCET?
(A) CPU idle time only
(B) Hardware only
(C) Disk scheduling
(D) Control flow complexity and function calls
12. Which WCET estimation technique considers all possible execution paths?
(A) Batch processing
(B) Measurement-based analysis only
(C) Static analysis
(D) Round-robin scheduling
13. Which WCET technique uses repeated execution on target hardware?
(A) Fixed-priority scheduling
(B) Static analysis
(C) Priority inversion
(D) Measurement-based analysis
14. Which of the following is TRUE about WCET?
(A) It represents the worst-case scenario, not the average execution time
(B) It is always equal to best-case execution time
(C) It ignores deadlines
(D) It increases CPU idle time automatically
15. WCET analysis helps in:
(A) Batch file processing only
(B) Web browsing
(C) Multimedia playback
(D) Real-time task scheduling and predictability
16. Which tool can help in WCET analysis?
(A) Web browsers
(B) Word processors
(C) Spreadsheet software only
(D) Static code analyzers and profiling tools
17. WCET is often expressed in:
(A) File sizes
(B) Bytes
(C) CPU cycles only
(D) Time units such as microseconds or milliseconds
18. What is the relationship between WCET and task deadlines?
(A) WCET is unrelated to scheduling
(B) WCET is always less than idle time
(C) WCET ignores deadlines
(D) Task deadlines must be greater than or equal to WCET
19. Which is a challenge in WCET analysis for modern processors?
(A) Batch scheduling only
(B) Caches, pipelines, and out-of-order execution
(C) Task naming conventions
(D) Disk usage exclusively
20. Proper WCET analysis ensures:
(A) Batch processing exclusively
(B) Random task execution
(C) Increased idle time only
(D) Deterministic and reliable real-time task execution