Computer Science Questions

How many percent is CPU utilization, when a computer system has enough room to hold two program and these programs are idle waiting for I/O half the time? *1/175% 50%25%None of the other choices

Which conditions of mutual exclusion does the Strict Alternation (Software proposal) violate *1/1No process running outside its critical region may block another processNo assumptions made about speeds or numbers of CPUsNo process must wait forever to enter its critical regionNo two processes simultaneously in critical region

Many coding systems include an extra bit, called a _______, for error detection purposesA. parity bitB. checking bitC. control bitD. padding bit

In a single processor system, mutual exclusion can be guaranteed by:1/1Overlapping processesInterleaving processesDisabling interruptsAll of the other choices

Which of the following statements is a hardware solution to the critical region problem? *1/1TSLSemaphoreNone of the other choicesShared memory

What is the purpose of process synchronization? *0/1Avoid race conditionNone of the other choicesLet different users run different processes independently Avoid deadlock

Which of the following process state transitions is illegal? *1/1Blocked (waiting) -> readyReady -> Blocked (waiting) Running -> Blocked (waiting)Running -> ready

Which of the following cannot be shared among different threads of a process? *1/1Stack Process codeFile handlesProcess data

Which of the following process state transitions is correct, when the scheduler picks a process from the ready queue to run? *1/1Running -> readyReady -> runningBlocked (waiting) -> readyRunning -> Blocked (waiting)

hich statement about disadvantage of Disabling interrupts, (the hardware solution to the critical region problem) is correct? *1/1Permit process use command privileges: Danger!If process is locked in Critical Section: System HaltAll of the other choicesDon't ensure Mutual Exclusion for the system with N CPUs

OS Windows use system call_____, while OS Unix use system call______ to terminate processes normally *1/1terminate; ExitProcessexit; ExitProcessExitProcess; exitExitProcess; terminate

____ is the act of allowing only one process to have access to a dedicated resource *1/1Mutual exclusion Circular waitNo preemptionResource holdin

What happens when a thread calls Down (S) when it wants to enter its critical section, where S is a binary semaphore set to 1? *1/1The thread is blocked and added to a queue of waiting threads.The semaphore is set to 2.The thread is allowed to enter its critical section and S is decremented.None of the other choices

Which of the following operating system has the concept of a process hierarchy? *0/1Win32 CP/MMS-DOSUnix

Which of the following is not true about process hierarchy? *1/1Window has no concept of a process hierarchyIn Unix, a process and all its children and further descendants together form a process groupA process creates child process. The child process can itself creates more processes, forming a process hierarchyA process may have more than one parent

What is the "sequential processes" concept? *1/1There are both many CPU and many PCNone of the other choicesAll process is executed in concurrencyNo concurrency inside a process; everything happens sequentiall

Which of the following conditions that causes the processes to be terminated, when the processes have a program bug? *0/1Fatal error (involuntary)Error exit (voluntary) Normal exit (voluntary)Killed by another process (involuntary)

Which of the following statements about user-level threads and kernel-level threads is correct? *0/1None of the other choicesBoth user-level threads and kernel-level threads can write into each other's memory spaceKernel-level thread scheduling is faster than user-level thread schedulingBoth user-level threads and kernel-level threads use OS services via system calls

A ____ is a portion of a process that can run independently *1/1thread programminiprocesssubprocess

Which of the events that causes the processes to be created, when the operation system creates a new process and runs the next job from the input queue? *0/1Initiation of a batch jobUser request to create a new process System initializationExecution of a process creation system call