Top 550+ Solved Operating System (OS) MCQ Questions Answer
Q. Which of the following algorithms tends to minimize the process flow time?
a. first come first served
b. shortest job first
c. earliest deadline first
d. longest job first
Q. Under multiprogramming, turnaround time for short jobs is usually and that for long jobs is slightly
a. lengthened; shortened
b. shortened; lengthened
c. shortened; shortened
d. shortened; unchanged
Q. Which is the most optimal scheduling algorithm?
a. fcfs – first come first served
b. sjf – shortest job first
c. rr – round robin
d. none of the mentioned
Q. The real difficulty with SJF in short term scheduling is
a. it is too good an algorithm
b. knowing the length of the next cpu request
c. it is too complex to understand
d. none of the mentioned
Q. The FCFS algorithm is particularly troublesome for
a. time sharing systems
b. multiprogramming systems
c. multiprocessor systems
d. operating systems
Q. What is ‘Aging’?
a. keeping track of cache contents
b. keeping track of what pages are currently residing in memory
c. keeping track of how many times a given page is referenced
d. increasing the priority of jobs to ensure termination in a finite time
Q. An SJF algorithm is simply a priority algorithm where the priority is
a. the predicted next cpu burst
b. the inverse of the predicted next cpu burst
c. the current cpu burst
d. anything the user wants
Q. Which of the following scheduling algorithms gives minimum average waiting time?
a. fcfs
b. sjf
c. round – robin
d. priority
Q. What is an operating system?
a. collection of programs that manages hardware resources
b. system service provider to the application programs
c. interface between the hardware and application programs
d. all of the mentioned
Q. To access the services of operating system, the interface is provided by the
a. system calls
b. api
c. library
d. assembly instructions
Q. Which one of the following is not true?
a. kernel is the program that constitutes the central core of the operating system
b. kernel is the first part of operating system to load into memory during booting
c. kernel is made of various modules which can not be loaded in running operating system
d. kernel remains in the memory during the entire computer session
Q. Which one of the following error will be handle by the operating system?
a. power failure
b. lack of paper in printer
c. connection failure in the network
d. all of the mentioned
Q. What is the main function of the command interpreter?
a. to get and execute the next user-specified command
b. to provide the interface between the api and application program
c. to handle the files in operating system
d. none of the mentioned
Q. In Operating Systems, which of the following is/are CPU scheduling algorithms?
a. round robin
b. shortest job first
c. priority
d. all of the mentioned
Q. If a process fails, most operating system write the error information to a
a. log file
b. another running process
c. new file
d. none of the mentioned