Using an operating system and file management

Correct answer: D. It saves changes made since the previous backup

Explanation: An incremental backup stores files or data that are new or changed since the most recent backup of any type. Thus option D is correct. It normally uses less time and storage than a full backup, although restoring may require the last full backup and the relevant sequence of incremental backups. The other options do not describe a backup method.

Correct answer: A. To verify that the backup can actually be read and restored

Explanation: A backup is useful only if its data can be read and restored when needed. A restore test checks that the backup is complete, accessible, and compatible with the recovery process; it can reveal corruption, missing files, or configuration problems. Option A is correct. Monitor brightness, printer speed, and file extensions do not verify data recovery.

Correct answer: C. Normal deletion does not immediately overwrite all data

Explanation: The governing concept is the difference between logical deletion and secure erasure. Deleting a file usually removes its directory reference and marks its storage space as available, but the old data may remain until new data overwrites it. Recovery tools can sometimes find those remnants, so option C is correct. The monitor, printer, and keyboard do not normally retain the deleted file.

Correct answer: A. The operating system may become unstable or fail to boot

Explanation: Hidden system files often contain configuration settings, startup information, drivers, or components required by the operating system. An incorrect edit can create errors, make applications fail, or prevent the computer from starting. Thus, option A is correct. Monitor size, printer ink, and automatic compression are unrelated effects. A backup and reliable instructions should be used before any change.

Correct answer: B. The attribute can indicate file behavior, while permission controls user rights

Explanation: A read-only attribute is a file or metadata setting that commonly signals that editing should be restricted, although software may interpret it differently. Read permission is an access-control rule determining whether a user or group may view the contents. Therefore, option B is correct. The two controls can interact but are not always identical; neither deletes files nor increases storage.

Correct answer: D. Process scheduler

Explanation: The governing concept is process scheduling. The process scheduler is the operating-system component that selects a ready process and assigns it processor time according to scheduling rules. It can pause one process and run another, supporting multitasking and responsiveness. Therefore option D is correct. A file manager organizes files, a device driver communicates with hardware, and the Recycle Bin holds deleted items; none allocates CPU time.

Correct answer: C. Excessive paging

Explanation: When RAM is too small for the active workload, the operating system repeatedly transfers memory pages between RAM and secondary storage. This excessive paging is commonly associated with thrashing and causes very slow performance because storage access is far slower than RAM access. Option C is correct. Indexing organizes search information, encryption protects data, and restoration recovers an earlier state.

Correct answer: B. Pending data in memory may be lost before being written to storage

Explanation: The governing concept is write caching: the system temporarily keeps data in memory to improve performance before committing it to storage. If power fails during that interval, the unwritten data can disappear and a recently changed file may be incomplete or inconsistent. Caching is not itself a guarantee of safety. The unrelated display, filename, and extension claims are false, so option B is correct.

Correct answer: C. Conflicting changes or data inconsistency

Explanation: The governing concept is concurrent access to shared data. When two programs write the same file simultaneously without suitable coordination, one update may overwrite part of the other, or the final contents may combine incompatible changes. This can produce data inconsistency or corruption. A file lock, controlled synchronization, or transaction mechanism can reduce the risk. The display and memory claims are unrelated, so C is correct.

Correct answer: A. A problem with boot files or the startup drive

Explanation: The startup sequence first performs hardware checks and then uses boot information from the startup drive to locate and load the operating system. If the hardware check succeeds but loading stops, damaged boot files or an unavailable startup drive are plausible causes. A mouse, speaker, or printer problem does not normally prevent the operating system from loading, so A is correct.

Correct answer: B. Providing core control of hardware and system resources

Explanation: The kernel is the central management component of an operating system. It coordinates processor time, memory, processes, and communication with hardware devices, while providing essential services to other software. Writing documents, browsing websites, and editing images are tasks performed by applications, not the kernel’s main function. Therefore, option B is correct.

Correct answer: D. When the program remains unresponsive and cannot be closed normally

Explanation: Force-closing is a troubleshooting action used when a program has frozen or remains unresponsive and its normal Close command does not work. Task Manager can terminate that process, but unsaved work may be lost and the action should not be routine. Normal programs should be closed normally; changing colours or shortening names requires another application. Therefore, D is correct.

Correct answer: A. It allocates available processor time and memory

Explanation: Multitasking depends on resource allocation and scheduling. The operating system gives processes appropriate portions of processor time and manages memory, rapidly switching or scheduling work so several applications appear to run together. It does not permanently close every program, rename a file, or control brightness as its defining multitasking action. Hence, option A correctly describes the process-management function.

Correct answer: B. They may become slow or less responsive

Explanation: The governing concept is competition for shared CPU resources. If one process consumes an unusually large amount of processor time, less time remains for other processes, so they may run slowly, respond late, or appear temporarily frozen. This does not automatically delete programs, alter their file formats, or switch off the monitor. Therefore, option B is the realistic performance effect.

Correct answer: B. Clear naming, controlled permissions, separate backups, integrity checks and safe deletion

Explanation: The governing concept is a layered file-management strategy: organisation, least-privilege access, independent recovery copies, integrity verification, and deliberate disposal. Clear names improve retrieval; permissions limit unauthorised changes; separate backups support recovery; integrity checks detect corruption; and safe deletion reduces accidental disclosure. Option B includes all these controls. Desktop-only storage, hidden extensions, or unchecked deletion each address little or create additional risk.

Correct answer: C. Preserve both versions compare the changes and carefully merge the required content

Explanation: The governing concept is conflict-safe version management. When two valid copies contain different changes, deleting either one first can destroy useful work. Preserve both originals, create a backup, compare the differences, and merge the required content into a clearly named new version. Option C follows this process. Changing extensions does not merge data, while deleting or recycling both copies risks permanent loss and prevents comparison.

Correct answer: B. Permission to list folder contents is restricted

Explanation: The governing concept is granular folder permission. Access to open or enter a folder is not always identical to permission to enumerate, or list, the files inside it. If listing permission is restricted, the user may reach the folder but see no file list or an incomplete view. Therefore option B is correct. Low RAM, monitor colour, and folder size do not normally control directory-listing authorisation.

Correct answer: C. The new format does not support all original features

Explanation: The governing concept is format compatibility. Different file formats are designed to store different kinds of content, layout details, metadata, or editing features. When a file is converted, the new format keeps only the features it understands; unsupported features may be removed or changed. Therefore, option C is correct. Monitor brightness, file-name length, and a shut-down system do not explain feature loss after a successful save.

Correct answer: D. Define one master version and use clear version names with controlled synchronisation

Explanation: The governing concept is file version control. A designated master copy provides one trusted source, while meaningful names such as Report_v2 or dated versions show which copy is newest. Controlled synchronisation then transfers approved changes and reduces conflicting edits. Thus, option D is correct. Vague names, unverified editing of every copy, and removing extensions increase confusion or may make files harder to open.

Correct answer: A. Manage hardware and core system resources

Explanation: The kernel is the central part of an operating system and applies the governing rules for managing resources. It coordinates the processor, memory, device access, and communication between applications and hardware. Therefore, option A is correct. Image editing, printing, and renaming files may be performed by applications or utilities that request kernel services, but none is the kernel’s main overall function.

Correct answer: B. Protect critical system parts from application errors

Explanation: The governing concept is privilege separation. Programs normally run in user mode with restricted permissions, while the kernel runs in privileged mode and controls sensitive memory, devices, and system operations. If an application crashes or behaves incorrectly, these limits help prevent damage to the whole system. Hence option B is correct. Full hardware control would weaken safety, and storage capacity or display resolution is unrelated.

Correct answer: C. Decide which process receives processing time next

Explanation: The governing concept is CPU scheduling. Several processes may be ready to run, but a processor core can execute only a limited number at a time. The scheduler selects the next process according to a policy such as priority, first-come-first-served, or time slicing, helping the system share CPU time. Thus option C is correct; file extensions, the Recycle Bin, and printer speed are managed elsewhere.

Correct answer: D. Deadlock

Explanation: The governing concept is deadlock. It occurs when processes are blocked in a cycle: process 1 holds resource A and waits for B, while process 2 holds B and waits for A. Because neither releases its resource, both remain unable to continue. Therefore option D is correct. Fragmentation concerns divided storage, archiving stores data for long-term use, and compression reduces data size.

Correct answer: A. Saves one process state and loads another process state

Explanation: The governing concept is context switching in multitasking. Before stopping a running process, the operating system saves its program counter, registers, and other control information in its process record. It then loads the saved state of another ready process so execution can continue from the correct point. Thus option A is correct; deletion, formatting, and turning off the monitor are unrelated actions.

Correct answer: B. When the required memory page is not present in main memory

Explanation: The governing concept is demand paging. A page fault occurs when a running process refers to a virtual-memory page whose contents are not currently in physical main memory. The operating system pauses the process, locates the page in secondary storage, loads it into an available frame, and updates the page information before retrying the instruction. Therefore option B is correct; the other choices concern unrelated devices or names.