Operating Systems MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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What is a ‘shell’ in an operating system?
A. A command-line interface that interprets user commands
B. A type of file system
C. An internal component that manages memory
D. A software layer that provides security features
Answer: A command-line interface that interprets user commands
Which system call is used to create a new process in UNIX-based operating systems?
A. exec()
B. fork()
C. wait()
D. exit()
Answer: fork()
In a time-sharing system, which scheduling technique ensures that each process gets equal time to run?
A. Round Robin
B. Priority Scheduling
C. First-Come, First-Served (FCFS)
D. Shortest Job Next (SJN)
Answer: Round Robin
Which of the following is true about kernel mode in an operating system?
A. It allows access to hardware resources and critical system operations
B. It restricts access to user-level applications only
C. It only handles I/O operations
D. It runs slower than user mode
Answer: It allows access to hardware resources and critical system operations
What is the main purpose of a process control block (PCB)?
A. To store the address of the next instruction
B. To keep track of process information such as process state, program counter, and register values
C. To manage memory allocation
D. To monitor I/O device usage
Answer: To keep track of process information such as process state, program counter, and register values
Which scheduling algorithm chooses the process with the smallest execution time?
A. Round Robin
B. Shortest Job First (SJF)
C. First-Come, First-Served (FCFS)
D. Priority Scheduling
Answer: Shortest Job First (SJF)
What is the primary difference between processes and threads?
A. Processes have separate memory spaces, while threads share the same memory space
B. Processes are faster than threads
C. Threads require more system resources than processes
D. Processes cannot be preempted, but threads can
Answer: Processes have separate memory spaces, while threads share the same memory space
Which of the following is not a valid state of a process?
A. Running
B. Waiting
C. Swapping
D. Terminated
Answer: Swapping
In a two-level paging system, what does the first-level page table contain?
A. Pointers to second-level page tables
B. Actual page frame addresses
C. Virtual page numbers
D. Process control blocks
Answer: Pointers to second-level page tables