Operating Systems OS MCQs-Important

By: Prof. Dr. Fazal Rehman | Last updated: April 19, 2025

1. Which of the following decides the minimum number of frames to be allocated to a process?
(A) Operating System
(B) The amount of available physical memory
(C) Instruction Set Architecture
(D) None of the above

2. Which implementation is used to separate mechanism from policy in the operating system?
(A) Two-level implementation
(B) Multi-level implementation
(C) Single-level implementation
(D) None

3. What is referred to as the operating system?
(A) Link to interface the hardware and application programs
(B) Collection of programs that manage hardware resources
(C) System service provider to the application programs
(D) All of the above

4. When a page fault occurs before an executing instruction is complete, what must happen?
(A) The instruction must be restarted
(B) The instruction must be completed ignoring the page fault
(C) The instruction must be ignored
(D) None of these

5. What is created by the operating system from the physical computer?
(A) Virtual device
(B) Virtual computers
(C) Virtual space
(D) None

6. Who provides an interface to access the services of the operating system?
(A) Assembly instructions
(B) Library
(C) API
(D) System calls

7. Suppose a machine in which all memory reference instructions have only one memory address. How many frame(s) do we need?
(A) Three
(B) Two
(C) One
(D) None

8. Which of the following shares characteristics with both hardware and software?
(A) Operating system
(B) Data
(C) Software
(D) None

9. Which one is false?
(A) Kernel is the program that constitutes the central core of the operating system
(B) Kernel is made of various modules which cannot be loaded in a running operating system
(C) Kernel is the first part of the operating system to load into memory during booting
(D) Kernel remains in the memory during the entire computer session

10. The maximum number of frames in a process is defined by:
(A) Operating System
(B) Instruction Set Architecture
(C) The amount of available physical memory
(D) None of the above

11. Multiprogramming systems:
(A) Execute each job faster
(B) Are used only on large mainframe computers
(C) Execute more jobs in the same time period
(D) Are easier to develop than single programming systems

12. Which of the following errors will be handled by the operating system?
(A) Power failure
(B) Connection failure in the network
(C) Lack of paper in printer
(D) All of the above