Kernel Services – Real-time Systems MCQs

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1. What is the primary role of kernel services in an RTOS?
(A) To provide essential functions like task scheduling, synchronization, and communication
(B) To execute only periodic tasks
(C) To reduce CPU utilization artificially
(D) To handle file management only

2. Which of the following is a typical kernel service in RTOS?
(A) Web browsing
(B) Task management
(C) Multimedia playback
(D) File editing

3. Task management services include:
(A) Disk scheduling
(B) CPU idle time management only
(C) Memory allocation exclusively
(D) Task creation, deletion, suspension, and resumption

4. Which kernel service is used to ensure tasks do not access shared resources simultaneously?
(A) Task period adjustment
(B) Synchronization services like mutexes and semaphores
(C) WCET reduction
(D) Batch processing only

5. Inter-task communication in RTOS kernel services is provided by:
(A) Periodic tasks only
(B) File system only
(C) CPU idle cycles
(D) Message passing and shared memory

6. Timer and clock management services in RTOS are responsible for:
(A) Increasing WCET
(B) Generating time ticks and managing delays for tasks
(C) Ignoring task priorities
(D) Batch processing only

7. Interrupt handling in kernel services allows:
(A) Tasks to respond to external events quickly
(B) Tasks to execute sequentially without preemption
(C) CPU idle time to increase
(D) Deadlines to be ignored

8. Memory management services in RTOS kernel are used for:
(A) Ignoring deadlines
(B) Scheduling periodic tasks only
(C) Reducing WCET
(D) Allocating and protecting memory for tasks and kernel objects

9. Which kernel service helps prevent priority inversion?
(A) EDF only
(B) RMS only
(C) Priority inheritance and priority ceiling protocols
(D) LLF only

10. Which service ensures tasks meet timing constraints in RTOS?
(A) Multimedia playback
(B) File system services
(C) Disk scheduling
(D) Scheduling and timing services

11. Which service in RTOS kernel is responsible for managing events between tasks?
(A) Batch processing only
(B) Event management services
(C) CPU idle management
(D) Memory protection exclusively

12. Which of the following is TRUE about kernel services?
(A) They ignore deadlines
(B) They execute tasks randomly
(C) They provide predictable and deterministic behavior for real-time tasks
(D) They reduce CPU utilization only

13. Kernel services typically include:
(A) Multimedia services only
(B) Web browsing only
(C) Task management, synchronization, communication, timing, and memory management
(D) Disk defragmentation

14. Which kernel service provides semaphores, mutexes, and monitors?
(A) Synchronization services
(B) Task scheduling only
(C) Timer management only
(D) Memory allocation only

15. Message queues in kernel services are used for:
(A) Reducing task WCET
(B) Disk scheduling
(C) Batch job execution
(D) Safe communication between tasks

16. Kernel services allow preemptive scheduling by:
(A) Allowing higher-priority tasks to interrupt lower-priority tasks
(B) Executing tasks sequentially only
(C) Ignoring deadlines
(D) Increasing WCET

17. Event flags and signals in RTOS kernel are used to:
(A) Notify tasks about occurrence of events
(B) Increase CPU idle time
(C) Reduce task periods
(D) Handle file systems only

18. The kernel’s timing services provide:
(A) CPU idle cycles only
(B) Web browsing
(C) Disk scheduling only
(D) Delay functions, periodic task triggering, and timeout management

19. Which kernel service ensures isolation between tasks?
(A) Disk scheduling
(B) Event handling only
(C) Memory protection and management
(D) Task periods

20. The primary benefit of RTOS kernel services is:
(A) Batch processing only
(B) Random task execution
(C) CPU idle time increase
(D) Predictable, deterministic, and reliable execution of real-time tasks