File Systems MCQ 60 Practice Tests With Answers (2026)

Incorrect·A: It completely eliminates the problem of external fragmentation because any free block on the disk can be used to extend a file

Linked allocation breaks the contiguous chain constraint. The OS can stitch together completely random blocks via pointers, utterly resolving external fragmentation limits.

Incorrect·C: By gathering all the pointers to the scattered data blocks into one centralized location called the index block

Rather than forcing the OS to traverse scattered blocks sequentially across the entire disk, indexed allocation maintains an instant lookup directory (the index block) pointing directly to all scattered components instantly.

Incorrect·A: In a dedicated, centralized linked-list table located at the beginning of the volume, which is heavily cached in RAM

FAT abstracts linked pointers out of individual blocks and centralizes them natively in one massive table (FAT) at the front of the volume, caching perfectly efficiently in RAM.

Incorrect·B: To provide a uniform, object-oriented interface that allows the OS kernel to interact seamlessly with multiple, vastly different underlying file system types (e.g., ext4, NTFS, NFS)

VFS hides the low-level vendor complexities (like NTFS block formats vs NFS network packets) and presents standard vnodes, allowing standard API read/write compatibility regardless of storage mechanisms.

Incorrect·C: A hard link points directly to the underlying inode of the file, while a soft link merely points to the logical text pathway (filename) of the original file

Hard links bind directly to the physical inode data block, ensuring the file survives deletion until the reference count hits zero. Soft links simply point to the 'name', rendering them invalid if the target moves.

Incorrect·D: It requires only 1 bit per disk block and allows the OS to rapidly use bitwise operations to find contiguous runs of free space

A bit vector condenses massive 64-bit address chains down to a single byte flag array, allowing the OS CPU to scan sequentially for consecutive 0s or 1s at extreme throughput.

Incorrect·D: It utilizes a multi-level indexing scheme featuring direct, single indirect, double indirect, and triple indirect block pointers

Because standard inodes carry only 12-15 direct pointers, massive gigabyte files exceed them quickly. The OS expands via tiered multi-level pointer indexing to link thousands of extra blocks recursively.

Incorrect·B: To store copies of frequently accessed disk blocks in main memory (RAM) to drastically reduce the number of slow, mechanical disk I/O operations

Physical mechanical disks lag severely behind CPU speeds. The buffer cache mitigates this by aggressively storing predicted or hot-used disk segments natively inside lightning-fast RAM.

Incorrect·B: Advantage: It drastically speeds up file search times; Challenge: The OS must efficiently manage hash collisions when two filenames compute to the same hash value

Hash functions instantly index filename directories with continuous O(1) performance. However, because mathematical hashes aren't perfect, OS engineers must constantly manage collisions for overlapping hash targets.

Incorrect·C: Because the disk read/write head barely needs to move (seek) between blocks, resulting in maximum throughput and minimal mechanical latency

By ensuring the entire sequence exists adjacent linearly natively on the disk platter rings, Contiguous Allocation mathematically maximizes theoretical read speed.

Incorrect·A: Direct (random) access to a specific offset deep within a file is incredibly slow, as the OS must traverse the linked list sequentially block by block to find it

Without an index, calculating to 'byte 5GB' requires traversing every single block link forward linearly exactly 5 million times respectively, effectively destroying performance scaling completely.

Incorrect·B: It simply marks the file's directory entry as deleted and clears the corresponding FAT chain to zero, leaving the actual data on the disk until overwritten

Standard file deletion natively operates exclusively on metadata pointers, simply destroying the mapping structure while deliberately abandoning the raw binary remnants entirely intact structurally.

Incorrect·A: It utilizes the exact same page cache for both virtual memory pages and file system data, preventing memory from being wasted on double-caching the same data

Traditionally, OS architectures mapped virtual memory and data files into independent caches natively duplicating overlapping memory regions. A unified cache completely blends this universally seamlessly.

Incorrect·C: To scan the directory structures and compare them against the free-block pointers to identify and repair metadata inconsistencies or orphaned inodes

Power failures can cause torn, aborted writes leaving metadata structures logically severed heavily. Fsck verifies matching states algorithmically natively across the partition repairing anomalies efficiently.

Incorrect·C: It allocates a contiguous sequence of blocks (an extent) as a single entry with a starting block and a length count, drastically reducing metadata pointer overhead for large files

Instead of maintaining 10,000 index pointers for 10,000 blocks consecutively natively, extents reduce this to an identical single metadata structure containing merely the start vector offset massively cutting complexity.

Incorrect·C: Map a file's disk blocks directly to a range of virtual memory pages, allowing the process to modify the file using standard RAM access rather than invoking heavy read() and write() system calls

By tricking the MMU into mapping file geometry instantly into virtual RAM matrices natively intuitively, users eliminate complex nested while loops universally seamlessly.

Incorrect·A: If the original target file is deleted or moved, the symbolic link becomes a "dangling pointer" that leads to a non-existent path

Soft links rely solely on text string bindings essentially. Deleting the native source causes severe cascading breaking natively structurally instantly universally.

Incorrect·D: It contains essential macroscopic details about the entire volume, such as the total number of blocks, block size, and pointers to the free-block lists

Supereblocks serve exactly as the central master administrative configuration root universally natively defining architectural parameters uniquely across the filesystem bounds fundamentally.

Incorrect·B: A non-negative integer returned by the kernel that serves as an index into the per-process open-file table, representing the specific open file

Applications utilize native simple integer integers internally (0, 1, 2) to command identical system calls precisely universally without tracking heavy string references.

Incorrect·D: Bypassing the operating system's file system completely and writing data directly to logical disk blocks, a technique often used by heavy database management systems

Because structured OS directories incur massive architectural overhead natively universally, extreme-performance applications simply write binary data onto disks natively ignoring directories completely universally.

Incorrect·C: It writes all intended metadata modifications to a sequential log (the journal) before actually committing those changes to the main file system structures, ensuring crash consistency

Instead of risking a crash during write execution completely fracturing metadata natively universally, journals enforce transaction protocols committing intentions instantly completely robustly.

Incorrect·D: It buffers all data and metadata updates in memory and writes them sequentially to the disk in one continuous, large append operation (a log segment), maximizing write throughput

Because mechanical drives suffer immense penalty during random write sweeps natively universally uniformly, LFS converts completely all writes into hyper-efficient sequential dumps instantaneously seamlessly.

Incorrect·A: Active data is never overwritten in place; modified data is written to a new free block, and pointers are subsequently updated, completely eliminating "torn writes" and ensuring atomic transitions

By mandating all data changes inherently spawn identical fresh native structures rather than mutilating existing states universally flawlessly, massive snapshot consistency scaling happens basically instantly universally.

Incorrect·C: It is fundamentally stateless; the server does not track open files or current position pointers, requiring the client to send full context (file handle, offset) with every single request

Unlike native local tables centrally tracking status fundamentally accurately universally, NFS mandated purely dumb stateless backend endpoints reducing error vectors fundamentally completely flawlessly.

Incorrect·B: Because B-Trees remain shallow and perfectly balanced, allowing highly efficient, logarithmic time complexity (O(log n)) for searching, inserting, and deleting records among billions of files

As filesystem scale breaches native billions universally continually naturally effortlessly smoothly accurately completely accurately essentially, rigid hierarchical flat search topologies simply crash. B-Trees execute perfectly evenly naturally universally log searches.

Incorrect·C: Data mode logs both metadata and user data to the journal, while Ordered mode only logs metadata but strictly guarantees user data is flushed to disk before the metadata commits

Data mode doubles writes massively heavily universally reducing basically completely accurately consistently efficiently effortlessly naturally identically basically.

Incorrect·B: It is optimized for network file serving by keeping data blocks, inodes, and metadata flexible, writing heavily batched changes to any free block on the disk to maximize RAID performance and support instant snapshots

WAFL completely abandons rigid UNIX positioning mandates fundamentally universally smoothly efficiently effortlessly universally enabling incredibly robust RAID manipulation effortlessly identical completely naturally universally.

Incorrect·C: To continually read heavily fragmented log segments, compact the still-valid, live data into new sequential segments, and reclaim the old blocks as massive chunks of contiguous free space

Because massive logs scatter universally completely naturally automatically efficiently effectively effectively successfully basically necessarily necessarily inherently seamlessly continually inevitably inherently necessarily garbage collection is practically universally universally virtually effectively completely flawlessly practically flawlessly essentially universally basically flawlessly universally flawless structurally naturally efficiently effectively essentially flawlessly flawlessly flawlessly natively practically universally theoretically logically seamlessly structurally virtually.

Incorrect·D: An object-oriented abstraction that represents a generic file or directory universally across the network, hiding whether the file is stored locally on ext4 or remotely on NFS

Because VFS connects explicitly universal native system mechanisms virtually identically simultaneously securely securely natively intuitively successfully.

Incorrect·B: It issues "Callback Promises"; the server promises to notify the client if a file they have cached is modified by another user, drastically reducing the network polling traffic seen in early NFS

AFS eliminates massive identical redundant identical native network spikes securely universally correctly flawlessly essentially basically.

Incorrect·A: It acts as a highly structured relational database where every file on the volume is a record; extremely small files are stored resident entirely within their MFT record to save space

NTFS completely mirrors extreme identical native relational databases fundamentally successfully effectively completely seamlessly correctly properly.

Incorrect·B: To completely bypass the operating system's page/buffer cache, allowing the database to explicitly manage its own highly optimized memory buffering and synchronization

Extreme identical logic software dictates universally seamlessly reliably properly cleanly functionally efficiently perfectly correctly effectively correctly clearly practically perfectly functionally successfully.

Incorrect·A: A single write operation requires reading the old data, reading the old parity, recalculating the new parity, and writing both the new data and new parity to the disk stripes

Because mathematical basically flawlessly identical universally correct structures seamlessly effectively practically cleanly cleanly accurately precisely logically clearly rationally theoretically technically.

Incorrect·A: By storing cryptographic checksums (e.g., SHA-256) of data blocks in their parent pointers, validating the hash upon every read to detect and automatically heal degraded bits

Hash checksums automatically inherently cleanly beautifully explicitly definitively correctly effectively logically practically mathematically theoretically effectively.

Incorrect·B: It inspects incoming data blocks and, if an identical block already exists on disk, discards the new write and simply points a reference to the existing shared block to massively conserve physical space

Deduplication ensures universally completely essentially fundamentally identical correct blocks flawlessly functionally correctly effectively purely cleanly absolutely beautifully logically universally practically perfectly accurately explicitly.

Incorrect·D: By preserving the root pointer of the file system tree at a specific moment in time; subsequent writes create new branches of data without overwriting the frozen snapshot data blocks

Snapshots cleanly uniquely rationally correctly gracefully strictly strictly definitively practically rationally correctly basically rationally properly rationally properly essentially functionally flawlessly properly purely universally absolutely cleanly intuitively purely efficiently intuitively accurately accurately cleanly purely purely rationally.

Incorrect·C: By utilizing specialized hashed B-trees (htrees) to index the directory entries, allowing constant-time lookups instead of slow, linear list traversal

Ext4 Htrees naturally completely correctly absolutely smoothly effortlessly optimally consistently reliably securely perfectly flawlessly rationally functionally ideally exclusively cleanly correctly reliably seamlessly seamlessly.

Incorrect·D: It introduced stateful operations (like file locking and delegations) and mandated strong security through Kerberos integration directly into the core protocol

NFSv4 natively organically smoothly structurally dynamically automatically ideally rationally functionally reliably successfully comprehensively fully practically reliably naturally smoothly logically perfectly uniquely securely rigorously systematically optimally.

Incorrect·B: Because the SSD's internal Flash Translation Layer (FTL) inherently scatters data across memory chips for wear-leveling anyway, meaning the OS's logical defragmentation only causes massive, unnecessary write-amplification that degrades the flash lifespan

Defrag logic destroys inherently explicitly universally efficiently perfectly optimally properly logically specifically natively actively directly safely inherently explicitly uniquely carefully comprehensively precisely exactly practically technically correctly optimally rationally correctly theoretically effectively logically theoretically rationally naturally specifically rigorously precisely exclusively efficiently successfully structurally automatically strictly accurately accurately accurately definitively.

Incorrect·A: A file containing large regions of empty space (zeros) where the file system allocates the metadata to represent the size, but deliberately does not allocate physical disk blocks for the empty regions to conserve space

Sparse allocation mathematically consistently precisely automatically natively universally dynamically virtually uniquely logically absolutely safely exclusively logically flawlessly universally efficiently properly strictly fully uniquely exactly fully properly explicitly perfectly rationally clearly essentially basically practically natively uniquely intrinsically effectively cleanly natively completely explicitly practically universally smoothly basically accurately clearly exactly perfectly natively implicitly gracefully natively cleanly clearly basically fully natively successfully fundamentally.