“Top 100 Operating System MCQs with Answers 2026”
Prepare smarter with Top 100 Operating System MCQs with Answers 2026 on MCQ Journey — your trusted platform for exam preparation and practice questions. This comprehensive set of multiple-choice questions covers key concepts in operating systems, including process management, memory allocation, scheduling, file systems, and security. Each MCQ is carefully designed with detailed answers to help students, professionals, and competitive exam aspirants strengthen their knowledge and improve accuracy. Ideal for university exams, GATE, UGC NET, interviews, and other competitive exams, these MCQs provide a reliable way to test understanding and boost confidence. Whether you are revising for semester tests or preparing for high‑stakes competitive exams, MCQ Journey offers authoritative, student‑friendly resources that make learning efficient and effective. Practice now to master operating system fundamentals and stay ahead in your exam preparation journey with this curated collection of MCQs with answers.
📝 MCQs Section
Q1. Which of the following is the core of an operating system?
A. Shell B. Kernel C. Command Line Interface D. Device Driver Answer: B Explanation: The kernel is the central part of the OS that manages hardware and system resources.
Q2. Which scheduling algorithm may cause starvation?
A. First-Come, First-Served (FCFS) B. Shortest Job Next (SJN) C. Round Robin D. Priority Scheduling Answer: D Explanation: Lower priority processes may never execute if higher priority processes keep arriving.
Q3. In operating systems, thrashing is related to:
A. CPU Scheduling B. Disk Fragmentation C. Excessive Paging D. Deadlock Answer: C Explanation: Thrashing occurs when the system spends more time swapping pages than executing processes.
Q4. Which of the following is NOT a type of operating system?
A. Batch OS B. Real-Time OS C. Distributed OS D. Compiler OS Answer: D
Q5. The banker’s algorithm is used for:
A. Memory Allocation B. Deadlock Avoidance C. CPU Scheduling D. File Management Answer: B
Q6. Which of the following is a non-preemptive scheduling algorithm?
A. Round Robin B. Priority Scheduling C. Shortest Job First (SJF) D. First-Come, First-Served (FCFS) Answer: D
Q7. Page replacement algorithms are used in:
A. CPU Scheduling B. Virtual Memory Management C. File Allocation D. I/O Scheduling Answer: B
Q8. Which of the following is an example of a real-time operating system?
A. Windows 10 B. Linux Ubuntu C. VxWorks D. MS-DOS Answer: C
Q9. Which memory management technique suffers from external fragmentation?
A. Paging B. Segmentation C. Contiguous Allocation D. Virtual Memory Answer: C
Q10. In UNIX, which command is used to list processes?
A. ls B. ps C. grep D. pwd Answer: B
Q11. Which of the following is used to synchronize processes?
A. Semaphore B. Cache C. Buffer D. Register Answer: A Explanation: Semaphores are synchronization tools used to control access to shared resources.
Q12. Which scheduling algorithm is best suited for time‑sharing systems?
A. FCFS B. Round Robin C. Priority Scheduling D. Shortest Job First Answer: B
Q13. In demand paging, what is a “page fault”?
A. Page not found in memory B. Page corrupted C. Page locked by another process D. Page swapped out permanently Answer: A
Q14. Which of the following is NOT a valid file access method?
A. Sequential Access B. Direct Access C. Indexed Access D. Randomized Access Answer: D
Q15. Which command in Linux is used to change file permissions?
A. chmod B. chperm C. permset D. setfile Answer: A
Q16. Which of the following is a disk scheduling algorithm?
A. FCFS B. SSTF C. SCAN D. All of the above Answer: D
Q17. Which of the following is true about virtual memory?
A. It increases physical memory size B. It allows execution of processes larger than physical memory C. It eliminates paging D. It is slower than cache memory Answer: B
Q18. Which of the following is used to prevent deadlock?
A. Resource Allocation Graph B. Banker’s Algorithm C. Mutual Exclusion D. Starvation Answer: B
Q19. Which of the following is NOT a valid state of a process?
A. Ready B. Waiting C. Running D. Terminated Answer: All are valid
Q20. Which of the following is an example of a distributed operating system?
A. Windows XP B. Amoeba C. MS‑DOS D. Solaris Answer: B
Q21. Which of the following is NOT a CPU scheduling criterion?
A. Turnaround Time B. Waiting Time C. Response Time D. Deadlock Time Answer: D
Q22. Which of the following is used to implement mutual exclusion?
A. Semaphore B. Monitor C. Mutex D. All of the above Answer: D
Q23. Which page replacement algorithm suffers from Belady’s anomaly?
A. FIFO B. LRU C. Optimal D. Clock Answer: A
Q24. Which of the following is NOT a valid system call?
A. fork() B. exec() C. wait() D. run() Answer: D
Q25. Which of the following is a preemptive scheduling algorithm?
A. FCFS B. SJF (non-preemptive) C. Round Robin D. Priority (non-preemptive) Answer: C
Q26. Which of the following is NOT a type of fragmentation?
A. Internal B. External C. Logical D. Physical Answer: C
Q27. Which of the following is used in process synchronization?
A. Critical Section B. Semaphore C. Monitor D. All of the above Answer: D
Q28. Which of the following is NOT a valid disk scheduling algorithm?
A. FCFS B. SSTF C. SCAN D. FIFO Answer: D
Q29. Which of the following is true about demand paging?
A. Pages are loaded only when needed B. All pages are loaded at once C. Pages are preloaded before execution D. Pages are locked permanently Answer: A
Q30. Which of the following is used to detect deadlock?
A. Resource Allocation Graph B. Banker’s Algorithm C. Wait-for Graph D. All of the above Answer: D
Q31. Which of the following is NOT a valid memory allocation strategy?
A. First Fit B. Best Fit C. Worst Fit D. Last Fit Answer: D
Q32. Which of the following is NOT a valid file system?
A. FAT32 B. NTFS C. EXT4 D. TXT Answer: D
Q33. Which of the following is used to manage I/O devices?
A. Device Driver B. Kernel C. Scheduler D. Compiler Answer: A
Q34. Which of the following is NOT a valid operating system?
A. Windows B. Linux C. Android D. Oracle Answer: D
Q35. Which of the following is NOT a valid scheduling algorithm for real-time systems?
A. Rate Monotonic Scheduling B. Earliest Deadline First C. Round Robin D. FCFS Answer: D
Q36. Which of the following is NOT a valid inter-process communication method?
A. Message Passing B. Shared Memory C. Signals D. Paging Answer: D
Q37. Which of the following is NOT a valid operating system security measure?
A. Authentication B. Authorization C. Encryption D. Compilation Answer: D
Q38. Which of the following is NOT a valid scheduling criterion?
A. CPU Utilization B. Throughput C. Fairness D. Deadlock Avoidance Answer: D
Q39. Which of the following is NOT a valid process state transition?
A. Ready → Running B. Running → Waiting C. Waiting → Ready D. Terminated → Running Answer: D
Q40. Which of the following is NOT a valid operating system function?
A. Process Management B. Memory Management C. File Management D. Compilation Answer: D
Q41. Which of the following is NOT a valid scheduling algorithm?
A. FCFS B. SJF C. Round Robin D. Binary Scheduling Answer: D
Q42. Which of the following is used to handle deadlock?
A. Prevention B. Avoidance C. Detection and Recovery D. All of the above Answer: D
Q43. Which of the following is NOT a valid memory management technique?
A. Paging B. Segmentation C. Contiguous Allocation D. Compilation Answer: D
Q44. Which of the following is NOT a valid file attribute?
A. Name B. Type C. Size D. Compiler Answer: D
Q45. Which of the following is NOT a valid operating system type?
A. Batch B. Real-Time C. Distributed D. Compiler Answer: D
Q46. Which of the following is NOT a valid disk scheduling algorithm?
A. FCFS B. SSTF C. SCAN D. FIFO Answer: D
Q47. Which of the following is NOT a valid process scheduling criterion?
A. CPU Utilization B. Throughput C. Deadlock Avoidance D. Waiting Time Answer: C
Q48. Which of the following is NOT a valid operating system service?
A. Process Management B. Memory Management C. File Management D. Compilation Answer: D
Q49. Which of the following is NOT a valid inter-process communication method?
A. Message Passing B. Shared Memory C. Signals D. Paging Answer: D
Q50. Which of the following is NOT a valid operating system security measure?
A. Authentication B. Authorization C. Encryption D. Compilation Answer: D
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