Practice OS MCQs covering CPU scheduling, memory management, file systems, system calls, and kernel architecture.
Operating system fundamentals including kernel, processes, scheduling, memory management, synchronization, deadlocks, and virtualization.
Batch, Time-Sharing, Distributed, Real-Time (Hard/Soft RTOS), Multiprocessing (SMP/AMP), Network, Clustered, Mobile, and Embedded Operating Systems.
CPU privilege levels, dual-mode operation, system calls, Mode Bit, x86 protection rings, context switching, KPTI, Meltdown/Spectre, vDSO, IOMMU, hypervisor rings, DMA attacks, and privilege escalation.
System calls, API mechanisms (POSIX/Win32/Java), IPC (message passing & shared memory), I/O operations, resource allocation, error detection, protection domains, ALPC, ptrace, mmap, sendfile, ETW, LKMs, and signal handling.
System call lifecycle, parameter passing (registers/block/stack), POSIX fork/exec/wait, mmap, vDSO, SYSCALL/SYSRET, seccomp, KPTI/Meltdown, eBPF, futex, splice, Copy-on-Write fork, Zombie cleanup, FUSE, and VM Exit mechanics.
User's view vs programmer's view of the OS, file abstraction, logical vs physical address space, file descriptors, system call interface, process abstraction, virtual memory, and the programmer's API surface.
File system fundamentals, contiguous/linked/indexed allocation, FAT, NTFS, ext4, inodes, directory structures, free-space management, journaling, VFS layer, and file permissions.
Hard disk structure, tracks, sectors, cylinders, CHS vs LBA addressing, disk geometry, platters, read/write heads, rotational latency, seek time, transfer rate, RAID levels, and SSD internals.
Magnetic tape organization, sequential access storage, tape drives (LTO), blocked records, inter-record gaps, tape labeling, archival storage, tape vs disk trade-offs, and backup strategies.
FCFS, SSTF, SCAN, C-SCAN, LOOK, C-LOOK disk scheduling algorithms, seek time optimization, rotational latency, throughput, fairness, starvation, and modern SSD scheduling considerations.
FCFS, SJF, SRTF, Round Robin, Priority Scheduling, MLFQ, Lottery Scheduling, Real-Time scheduling (EDF, RMS), context switching overhead, starvation, aging, and Linux CFS scheduler internals.
Operating Systems is a core paper in every B.Tech, MCA, BCA, and M.Tech Computer Science curriculum, and one of the highest-weightage sections in GATE CSE. These Operating Systems MCQs cover every concept that appears in university semester exams, GATE, UPSC CS, placement aptitude tests, and technical interview rounds.
The collection spans 11 structured topic areas: Introduction to Operating Systems, Types of Operating Systems (batch, time-sharing, real-time, distributed), Kernel Mode vs. User Mode, OS Services, System Calls (fork, exec, wait, read, write), User's & Programmer's View, File Systems (FAT, NTFS, ext4, inodes, directory structures), Disk Organization & Scheduling, Tape Organization, Disk Scheduling Algorithms (FCFS, SSTF, SCAN, C-SCAN, LOOK), and CPU Scheduling Algorithms (FCFS, SJF, Round Robin, Priority, Multilevel Queue).
Each topic has 60 questions divided into three difficulty levels — Basics, Concepts, and Advanced — so you can master fundamentals before tackling the complex scenario-based questions that GATE and placement examiners favour.
Key exam focus areas: the four Coffman conditions for deadlock (Mutual Exclusion, Hold & Wait, No Preemption, Circular Wait), virtual memory and page replacement algorithms (LRU, FIFO, Optimal), Belady's Anomaly, process vs. thread distinctions, and scheduling algorithm turnaround time calculations — these appear in almost every OS exam paper.
These Operating Systems multiple-choice questions cover every concept tested in university exams, placement tests, GATE preparation, and technical screening rounds. From foundational definitions to tricky edge-case scenarios, every MCQ comes with a verified explanation to reinforce the concept — not just the answer.
MCQ practice is the fastest way to identify gaps in your knowledge. Selecting the wrong option is valuable — it shows you exactly what needs more review. Use Exam Mode to build the recall speed that matters in timed tests, and Study Mode to absorb explanations during initial learning.
Combine these MCQs with the Operating Systems Theory Notes for conceptual depth and the Operating Systems Interview Q&A guide for answer phrasing under pressure. Together, the three resources cover every angle: understanding, rapid recall, and articulation.
