WGU C191 Exam 2025 Questions and
Answers
What is the role of the OS? - ANS To manage a computer's hardware
Which OS service provides functions that are helpful to the user? - ANS Program execution
Which OS service provides functions that are helpful to the user? - ANS Program execution
Which system call is used for device manipulation? - ANS ReadConsole()
Which system calls can be grouped under the category of process controls? - ANS Allocate,
free memory
Which service function is responsible for identifying and correcting exceptions such as the lack
of paper in a
printer? - ANS Error detection
Which type of OS service uses the CLI? - ANS User interface
What represents layer zero (0) in the layered approach? - ANS Hardware
Pg. 1 Copyright © 2025 Jasonmcconell. ALL RIGHTS RESERVED.
, What is a disadvantage of booting an OS stored in ROM? - ANS Changing a bootstrap
requires new hardware chips.
What is a valid process state? - ANS Waiting
What are two valid components of a process control block (PCB)? - ANS The process counter
& The process state
What is the difference between kernel and user threads? - ANS Kernel threads are directly
managed by the operating system, whereas user
threads are managed without kernel support.
Which advantage does short-term scheduling have compared with long-term scheduling? -
ANS It takes less time to select a process to execute next.
What is considered stable when the average rate of process creation is equal to the average
departure rate
of processes leaving the system? - ANS The degree of multiprogramming
Which action allows an application that is in the background to be passed to the foreground
and vice versa? - ANS Memory reload
What is the process of context switching? - ANS Performing a state save and a state restore
Which features are included in the DTrace tool? - ANS Compiler, providers of probes, and
consumers
What is the difference between cooperative and preemptive scheduling? - ANS Cooperative
scheduling occurs when a process terminates, whereas preemptive
Pg. 2 Copyright © 2025 Jasonmcconell. ALL RIGHTS RESERVED.
Answers
What is the role of the OS? - ANS To manage a computer's hardware
Which OS service provides functions that are helpful to the user? - ANS Program execution
Which OS service provides functions that are helpful to the user? - ANS Program execution
Which system call is used for device manipulation? - ANS ReadConsole()
Which system calls can be grouped under the category of process controls? - ANS Allocate,
free memory
Which service function is responsible for identifying and correcting exceptions such as the lack
of paper in a
printer? - ANS Error detection
Which type of OS service uses the CLI? - ANS User interface
What represents layer zero (0) in the layered approach? - ANS Hardware
Pg. 1 Copyright © 2025 Jasonmcconell. ALL RIGHTS RESERVED.
, What is a disadvantage of booting an OS stored in ROM? - ANS Changing a bootstrap
requires new hardware chips.
What is a valid process state? - ANS Waiting
What are two valid components of a process control block (PCB)? - ANS The process counter
& The process state
What is the difference between kernel and user threads? - ANS Kernel threads are directly
managed by the operating system, whereas user
threads are managed without kernel support.
Which advantage does short-term scheduling have compared with long-term scheduling? -
ANS It takes less time to select a process to execute next.
What is considered stable when the average rate of process creation is equal to the average
departure rate
of processes leaving the system? - ANS The degree of multiprogramming
Which action allows an application that is in the background to be passed to the foreground
and vice versa? - ANS Memory reload
What is the process of context switching? - ANS Performing a state save and a state restore
Which features are included in the DTrace tool? - ANS Compiler, providers of probes, and
consumers
What is the difference between cooperative and preemptive scheduling? - ANS Cooperative
scheduling occurs when a process terminates, whereas preemptive
Pg. 2 Copyright © 2025 Jasonmcconell. ALL RIGHTS RESERVED.
