Operating Systems MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation

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What is ‘virtual memory’?

A. A memory management technique that provides an illusion of a large, contiguous memory space
B. A type of physical memory used in computers
C. A method to cache frequently accessed data
D. A technique for increasing CPU speed

Answer: A memory management technique that provides an illusion of a large, contiguous memory space

Which of the following is an example of a ‘preemptive’ scheduling algorithm?

A. Round Robin
B. Shortest Job First (SJF)
C. First-Come, First-Served (FCFS)
D. Priority Scheduling

Answer: Round Robin

What does ‘fork’ system call do in UNIX-like operating systems?

A. Creates a new process by duplicating the current process
B. Executes a new program within the same process
C. Terminates the current process
D. Waits for a process to finish execution

Answer: Creates a new process by duplicating the current process

Which of the following is a technique to avoid deadlock?

A. Using the Banker's algorithm to allocate resources safely
B. Increasing the size of the process queue
C. Using priority scheduling
D. Allocating all resources at once

Answer: Using the Banker's algorithm to allocate resources safely

What is the purpose of the ‘kernel’ in an operating system?

A. To manage hardware resources and provide a stable interface between hardware and user applications
B. To handle user input and output operations
C. To manage network communications
D. To execute user applications

Answer: To manage hardware resources and provide a stable interface between hardware and user applications

Which of the following describes ‘critical section’ in process synchronization?

A. A segment of code that must be executed by only one process at a time
B. A section of code that handles system calls
C. A part of the operating system that manages memory
D. A section of memory used for process communication

Answer: A segment of code that must be executed by only one process at a time

What is ‘paging’ used for in an operating system?

A. Dividing memory into fixed-size blocks to manage memory more efficiently
B. Allocating CPU time to processes
C. Managing I/O operations
D. Handling process synchronization

Answer: Dividing memory into fixed-size blocks to manage memory more efficiently

What is the purpose of ‘system calls’ in an operating system?

A. To provide a mechanism for user programs to request services from the operating system
B. To manage hardware interrupts
C. To schedule processes
D. To handle network communications

Answer: To provide a mechanism for user programs to request services from the operating system

Which of the following is not a valid page replacement algorithm?

A. Least Recently Used (LRU)
B. First-In, First-Out (FIFO)
C. Optimal Page Replacement
D. Segmentation

Answer: Segmentation