OSG202 Exam Practice Questions and Answers

OSG202 Exam Practice Questions and Answers ____is a sort of pseudofile that can be used to connect to processes a. A block b. A pipe c. A specific file d. A block file - ANSWER-b _____ are used to model devices that consist of a collection of randomly addressable blocks such as disks a. A character special file b A separate special file c. A block special file d. A pipe special file - ANSWER-c ©EMILLECT 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER 2024 Page 2/194 _____ are used to model printers, modems, and other devices that accept or output a character stream a. A character special file b. A separate special file c. A block special file d. A pipe special file - ANSWER-a OS manage the system security such as authentication, protecting the system from unwanted intruders a. Security b. Authentication c. Protection d. Block access - ANSWER-c The UNIX command interpreter, or GUI a. shell b. prompt c. command ©EMILLECT 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER 2024 Page 3/194 d. compiler - ANSWER-a Which of these statements about virtual memory are true? a. Gives the ability to run programs larger than the machine's physical memory by moving pieces back and forth between RAM and disk b. Largely magnetic-tape based c. Virtual Memory is a external memory d. Enabled the ability to have a program dynamically link on a library at run time instead of having it compiled in - ANSWER-a d Which of these statements about virtual memory are not true? a. Gives the ability to run programs larger than the machine's physical memory by moving pieces back and forth between RAM and disk b. Enabled the ability to have a program dynamically link on a library at run time instead of having it compiled in c. None of others - ANSWER-c System calls a. Permit application programs to access protected resources ©EMILLECT 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER 2024 Page 4/194 b. The interface between user programs and the OS c. The GUI between user program and the OS - ANSWER-a b Put the steps in making a system call in order 1. System calls may vary from one OS to another 2. System calls are like procedures: take parameters, calling routine waits for response (a call to an OS service) 3. Once a system call occurs control passes to a specific routing in system mode. If the parameters are correct and legal the request will be executed (a trap into the OS code) a. 1, 2, 3 b. 2, 3, 1 c. 3, 1, 2 d. 3, 2, 1 - ANSWER-b Which of these statements about Monolithic Systems are true? a. A set of service procedures that carry out the system calls b. A set of utility procedures that Help the service procedures ©EMILLECT 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER 2024 Page 5/194 c. A main program that invokes the requested service procedure d. All of others - ANSWER-a Which is the difference between personal computers and mainframe computers? a. Personal computers are always interactive b. Mainframe computers are mostly batch systems with many users c. Protection is much more important on mainframe computers d. All of the others - ANSWER-d What is not a main function of an operating system? a. Provide the users with an extended (virtual) machine b. Manage the I/O devices c. Provide user interfaces d. Support virtual memory - ANSWER-c