Operating System Basics Questions and Answers
Operating System Basics questions with answers are among the most commonly asked in technical interviews and exams. This section covers core OS concepts like process management, memory allocation, file systems, and scheduling algorithms. Practicing programming questions and answers on operating systems helps strengthen your conceptual clarity and practical understanding of computer architecture. Frequently featured in GATE, TCS, Infosys, and Wipro placements, these MCQs provide a balanced mix of theoretical and applied knowledge. Clear explanations make this section an ideal resource for anyone preparing for system-related roles or competitive exams.
Operating System Basics
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563 questions
421. The S-SCAN, in disk scheduling states
- The arm movement is uni directional
- The arm movement is bdirectional
- The are is to be state fixed
- None of these
422. RAID-O does not support the following characterstics: A: RAID is a set of physical disk drives viewed by the operating system as a single logical drive. B: Data distributed across the physical drives of an array. C: Re-demdant disk capacity is used to store parity information, which gurantees data recoverability in case of a disk failure.
- A and B
- A only
- B only
- C only
423. The UNIX scheduling gives
- Highest preference to real time processes
- Highest preference to kernel mode processes
- Highest preference to user mode processes
- Highest preference to shared processes
424. In disk scheduling when SCAN (Look) policy is applied and when last track reached in one direction
- The service direction is reversed and scan proceeds in opposite direction.
- The Arm returns to the opposite end of the disk and scan begins again.
- A and B both true.
- None of these
425. In RAID (Redundant Array of independent Disks) scheme, which of the following RAID level does not include redundancy to improve performance ?
- RAID level 0
- RAID level 2
- RAID level 1
- RAID level 4
426. In which of the following RAID schemd, redundancy is achieved by the simple expedient of duplicating all the data ?
- RAID level 0
- RAID level 1
- RAID level 2
- RAID level 3
427. In shortest service time first policy, applied on disk scheduling, the disk request is selected
- That requires the least movement of disk arm from its current position.
- That requires the maximum movement of disk arm from its current position.
- That is recently received.
- On random.
428. The RAID (Redundant Array of independent disks)level one requires
- Same disk space of the logical disk that it support
- Twice disk space of the logical disk that it support
- Thrice disk space of the logical disk that it support.
- Half disk space of the logical disk that it support.
429. Match the following in RAID scheme : A-Parallel access array, B-Independent access array, 1- All member disks participate in the execution of every I/O request. 2- Each member disk participates separately in the execution of every I/O request. 3- Here spinles of the individual drives are synchronized so that each disk head is in the same position on each disk at any given time.
- A - 1, 3 and B - 2
- A - 1, and B -2, 3
- A - 2, and B- 1, 3
- A - 1, 2 and B - 3
430. The following RAID level employer parallel access technique and single redundant disk
- RAID level 0
- RAID level 1
- RAID level 2
- RAID level 3