Operating Systems MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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What does the term ‘system call’ refer to in an operating system?
A. A programmatic way in which a process requests a service from the kernel
B. A method to terminate processes
C. A mechanism to allocate memory
D. A way to switch between processes
Answer: A programmatic way in which a process requests a service from the kernel
Which of the following memory management techniques leads to external fragmentation?
A. Segmentation
B. Paging
C. Swapping
D. Virtual memory
Answer: Segmentation
What does ‘paging’ refer to in memory management?
A. Dividing memory into fixed-size blocks for process allocation
B. Swapping memory between disk and RAM
C. Allocating more memory than available
D. Reallocating memory between different processes
Answer: Dividing memory into fixed-size blocks for process allocation
Which of the following scheduling algorithms is most suitable for time-sharing systems?
A. Round Robin
B. Priority Scheduling
C. First-Come, First-Served
D. Shortest Job First
Answer: Round Robin
In which of the following scenarios is ‘preemptive scheduling’ preferred?
A. When a process with higher priority needs immediate CPU access
B. When all processes have equal priority
C. When processes share the CPU equally
D. When preventing starvation of long processes
Answer: When a process with higher priority needs immediate CPU access
What does the term ‘kernel panic’ refer to in operating systems?
A. A fatal error in the kernel leading to system crash
B. The operating system running out of memory
C. The kernel trying to access unauthorized memory
D. Too many processes running simultaneously
Answer: A fatal error in the kernel leading to system crash
Which of the following file systems is most commonly used for Linux?
A. EXT4
B. FAT32
C. NTFS
D. ReFS
Answer: EXT4
In a UNIX operating system, what does the command ‘chmod 755’ do?
A. Grants the owner read, write, and execute permissions, while others get only read and execute
B. Removes write permission for everyone
C. Grants execute permission to everyone
D. Revokes all permissions from the owner
Answer: Grants the owner read, write, and execute permissions, while others get only read and execute
What does ‘DMA’ stand for in operating systems?
A. Direct Memory Access
B. Disk Management Access
C. Device Monitoring Allocation
D. Dynamic Memory Allocation
Answer: Direct Memory Access