Embedded Real Time Operating System MCQs with answers Page - 12

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Q. Time required to synchronous switch from the context of one thread to the context of another thread is called?

  • (A) threads fly-back time
  • (B) jitter
  • (C) context switch time
  • (D) none of the mentioned

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Q. Which one of the following is a real time operating system?

  • (A) RTLinux
  • (B) VxWorks
  • (C) Windows CE
  • (D) All of the mentioned

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Q. VxWorks is centered around ___________

  • (A) wind microkernel
  • (B) linux kernel
  • (C) unix kernel
  • (D) none of the mentioned

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Q. Tasks whose execution would begin randomly and within the interval of arrival times of consecutive tasks is known as

  • (A) Periodic Task
  • (B) Aperiodic Task
  • (C) Sporadic Task
  • (D) none of the mentioned

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Q. What is True for a task vis-à-vis a process?

  • (A) Tasks are complex compared to processes
  • (B) Tasks represent only a single sequence of instructions
  • (C) Processes can spawn threads but tasks cannot spawn tasks Tasks and processes are one and the same thing
  • (D) Tasks and processes are one and the same thing

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Q. What does the utilization rate tells us? Select one:

  • (A) If it is larger or equal to 1, the system is not feasible
  • (B) If it is smaller than 1, the system is feasible
  • (C) If it is exactly 1, the system is feasible
  • (D) if there is no context switch overhead If it is 0, the system is absolutely feasible

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Q. if jobs have unpredictable release times, a task is termed :

  • (A) aperiodic
  • (B) sporadic periodic.
  • (C) both
  • (D) None of these

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Q. What is TRUE for an aperiodic task and a sporadic task:

  • (A) A sporadic task and an aperiodic task are one and the same thing
  • (B) An aperiodic task occurs randomly and has hard real time requirements
  • (C) A sporadic task occurs randomly and has hard real time requirements
  • (D) A sporadic task becomes aperiodic when it is executed with a periodic task

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Q. State whether the following statements are True or False for the features of real time operating system.
i) fast process or thread switch
ii) ability to respond to external interrupts quickly.
iii) minimization of intervals during which interrupts are enabled.
iv) preemptive scheduling based on priority

  • (A) i, ii and iii only
  • (B) ii, iii and iv only
  • (C) i, ii and iv only
  • (D) All i, ii, iii and iv

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Q. Effective release time of a job without the predecessors is equal to its given …………….

  • (A) release time
  • (B) Deadline
  • (C) both
  • (D) None of these

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