OMG UM0-401 Exam (page: 1)
OMG UM0-401 OCRES-Intermediate Exam
Updated on: 12-Feb-2026

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An example of a module exhibiting temporal cohesion is a combination of-------

  1. the control and management of two onboard hardware clocks
  2. a 40 millisecond periodic navigation function and a 40 millisecond periodic display update function
  3. several mathematical functions such as the sine, cosine, and arctangent functions
  4. the vehicle speed and acceleration management functions

Answer(s): B



What two actions must occur in systems that use overlaying with a disk drive backing store? (Choose two.)

  1. Only data is stored on the disk and code is stored in RAM.
  2. A task executing in RAM can also execute code that is stored on the disk.
  3. The operating system must prevent each task in RAM from accessing RAM outside the area reserved for it.
  4. The code for the currently executing tasks is stored in RAM and that for the currently inactive tasks is stored on the disk, as managed by the operating system.

Answer(s): C,D



Which two statements about static memory allocation are true? (Choose two.)

  1. Garbage collection is not required.
  2. Memory fragmentation does not occur.
  3. Memory allocation units are always the same fixed size.
  4. Tasks must inform the run-time (e.g., operating system) the total amount of memory they will need before they begin requesting memory.

Answer(s): A,B



POSIX ----------------------

  1. is the same as UNIX
  2. is not designed for real-time systems
  3. does not support asynchronous I/O
  4. is an operating system interface standard

Answer(s): D



A scheduler runs tasks to completion instead of pre-empting tasks by time slicing or according to priority.
What two actions will occur? (Choose two.)

  1. Maximize the number of completed tasks per unit of time
  2. Minimize the task scheduling and context switching overheads
  3. Honor the commitment made to complete the task once it has begun executing
  4. Share the processor time fairly among ready tasks

Answer(s): B,C



Which two statements are true of a monitor for synchronization? (Choose two.)

  1. No concurrent access by tasks is allowed to any resource(s) within a monitor.
  2. One monitor may encapsulate any number of resources and their synchronization functions.
  3. If a requesting task enters a monitor but finds the resource isn'tavailable, the task exits the monitor and is placed at the end of the monitor's external queue.
  4. If two tasks are waiting in a monitor's queues for separate resources, when the task that has been accessing a resource finishes doing so, all the queues with waiting tasks are served round-robin.

Answer(s): A,B



Which two are POSIX real-time extensions? (Choose two.)

  1. suspend / resume API's
  2. direct cyclic executive support
  3. task synchronization
  4. priority-based preemptive task scheduling

Answer(s): C,D



Which two of these techniques would successfully avoid mutual exclusion deadlocks? (Choose two.)

  1. Set up a circular dependency of tasks and resources
  2. Allow a task's use of a resource to be pre-empted
  3. Require tasks to acquire and use only one resource at a time
  4. Require tasks to acquire resources in order of the tasks' priorities

Answer(s): B,C



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