UM0-401 Free Exam Questions & Answers (Updated 2026)

Question No 1

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

Choose the Choices:

Only data is stored on the disk and code is stored in RAM.

A task executing in RAM can also execute code that is stored on the disk.

The operating system must prevent each task in RAM from accessing RAM outside the area reserved for it.

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.

Question No 2

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

Choose the Choices:

Garbage collection is not required.

Memory fragmentation does not occur.

Memory allocation units are always the same fixed size.

Tasks must inform the run - time (e.g., operating system) the total amount of memory they will need before they begin requesting memory.

Question No 3

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

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Question No 4

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.)

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Maximize the number of completed tasks per unit of time

Minimize the task scheduling and context switching overheads

Honor the commitment made to complete the task once it has begun executing

Share the processor time fairly among ready tasks

Question No 5

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

Choose the Choices:

No concurrent access by tasks is allowed to any resource(s) within a monitor.

One monitor may encapsulate any number of resources and their synchronization functions.

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.

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.

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