Basic computer operations (hardware and software)

The governing concept is file association. An operating system commonly links an extension, such as a document type, with a default application used to open it. When two application versions are installed, that link may refer to an unintended version or change during installation. The file itself is not necessarily damaged. Memory permanence, processor failure, and doubled power are unrelated distractors.

Compatibility mode is an operating-system feature for running legacy software that expects older system settings, interfaces, or behaviors. It may imitate selected conditions of an earlier operating-system version, helping the program run on a newer system. Therefore option B is correct. It does not erase memory, load printer paper, increase disk capacity, or replace the operating system itself.

The governing concept is storage-error management. A bad sector is a physical or magnetic area that cannot reliably read or write data. During a disk check, the operating system may record that area as unusable and, where possible, use another sector for future data. This does not increase processor speed or change a monitor into a printer. It also cannot make volatile main memory permanent, so B is the only technically suitable answer.

The governing concept is fault isolation. Safe mode starts the operating system with a limited set of essential drivers and services, so a faulty third-party driver or startup program is less likely to interfere. If the problem disappears in safe mode, those excluded components become useful suspects. Safe mode does not double storage, automatically remove every virus, or improve monitor resolution; therefore C is correct.

The governing concept is startup-resource management. An application that launches automatically may consume processor time, memory, and sometimes network resources before the user needs it. Disabling a nonessential startup item can reduce the initial workload and may make login faster while leaving the program available for manual opening. It cannot erase the file system, add processor cores, or change screen brightness, so D is correct. Essential security services should not be disabled carelessly.

The governing concept is systematic device troubleshooting. Correct detection shows that the operating system can recognize the device, but recognition alone does not prove that the driver, permissions, configuration, or application settings are correct. The next sensible step is to inspect those software controls and test the device in another suitable application if needed. Measuring monitor height, deleting personal files, or removing the processor does not diagnose the functional problem, so B is correct.

The governing concept is system time synchronization. File creation, modification, and access timestamps are commonly taken from the operating system clock, which may be initialized from the hardware clock. If the two disagree, timestamps can be wrong and scheduled tasks or authentication may behave unexpectedly. Therefore option A is correct; the other choices do not follow from clock disagreement.

An event log is a diagnostic record maintained by the operating system or an application. It may show the crash time, error code, failing module, and related warnings, allowing a technician to compare repeated failures and identify patterns. Hence option C is correct. A log does not repair hardware, add RAM, or automatically restore every file; it supplies evidence for troubleshooting.

The governing concept is system software and resource management. An operating system acts as an intermediary between users or applications and hardware. It allocates processor time and memory, controls input and output devices, and coordinates running programs. Therefore option B is correct. Writing documents and printing can be tasks of applications, while the operating system is software, not a physical part of the computer case.

The governing concept is hardware control through system software. A device driver translates operating-system commands into signals or instructions that a particular printer, keyboard, graphics device or other peripheral can understand. Consequently, option C is correct. Permanent file storage is the role of storage media, electrical power comes from power hardware, and drawing images is an application task rather than the purpose of a driver.

The governing concept is device recognition through a driver. A printer driver supplies the operating system with the instructions and interface information needed to identify the printer and send correctly formatted print jobs. Therefore option D is the best answer when a connected printer is not recognised. RAM, a graphics card and a cooling fan may support general operation, but none specifically translates communication for that printer.

The governing concept is the difference between permanent storage and working memory. RAM temporarily holds the instructions and data needed by currently running applications. Opening several applications increases this demand, so insufficient RAM can cause slow performance even when the hard drive or other storage has plenty of free space. A printer, scanner, and monitor do not provide this working memory.

The operating system is system software that manages hardware resources, controls basic operations, provides a user interface, and allows application programs to run. An image editor, word processor, and presentation program are application software; they depend on the operating system rather than managing the whole computer. Therefore, option C is correct.

The governing concept is hardware–software communication. A device driver is a special system program that translates the operating system’s general commands into instructions understood by a particular printer, keyboard, graphics card, or other device. Thus option A is correct. Spreadsheet software calculates data, a web browser opens web pages, and an image editor modifies pictures; none directly manages device communication.

The governing concept is the distinction between firmware and ordinary software. Firmware consists of low-level instructions stored in non-volatile memory within a device, allowing it to perform essential startup and control functions even when power is removed. Therefore option B is correct. An application serves a user task, whereas a document and a folder are data-organising objects, not permanent control instructions.

The governing concept is the interdependence of hardware and software. Hardware consists of the physical parts, while software supplies the instructions that control those parts. For example, a printer can produce a document only when suitable software sends it correct instructions, and the processor needs programs to perform useful operations. Monitor size, printer speed, or mouse type alone cannot make every component function properly. Therefore, option D is correct because coordinated hardware and software are required.

The governing concept is non-volatile memory. ROM retains its stored instructions even when the computer is switched off, so it can hold firmware or boot instructions needed during startup. Cache memory, registers, and RAM are volatile working memories whose contents normally disappear when power is removed. ROM is not intended for rapidly changing temporary data, but its ability to preserve instructions makes option C correct.

The system unit is the computer’s main case and the collection of internal hardware installed in it, such as the motherboard, memory, storage devices, power supply, and CPU. The CPU is only the processor that executes instructions and performs calculations. Thus option A is correct. The CPU is not always external, the system unit is physical hardware rather than software, and neither term means only an output device.

A device driver is software that translates the operating system's general instructions into commands understood by a particular device, such as a printer, keyboard, or graphics card. Therefore, option C is correct. The driver does not create storage, cool the computer, or automatically print files; those functions belong to other hardware or software.

The governing concept is the relationship between hardware and system software. A device driver translates operating-system instructions into commands that the network card can understand. If the driver is missing, the physical card may be installed but the operating system may not identify, configure, or use it correctly. Thus option A is correct; the other choices describe unrelated and technically impossible effects.

The governing concept is comparative troubleshooting: test a suspected part against a known working example and change only one variable at a time. If the same computer reads other CDs, the optical drive and its basic connection are probably functioning. The evidence therefore supports option B, that the particular disc may be damaged, dirty, incompatible, or poorly recorded. It does not prove a processor, RAM, or monitor-port failure.

The governing concept is that USB power delivery and data communication are related but separate functions. A port may supply electrical power while damaged data contacts, a defective cable or drive, or a missing and faulty driver prevents information transfer. Thus option A is the appropriate possible cause. Printer paper, monitor size, and case colour have no logical connection with reading USB data.

The governing concept is hardware–software interdependence. Software consists of instructions and programs, while hardware supplies the physical components that execute those instructions. Therefore, option A is correct: hardware needs software to perform useful operations, and software needs hardware to run. Options B, C, and D incorrectly treat the two parts as independent.

The governing concept is system software and resource management. An operating system controls hardware such as memory, processors, storage, and input/output devices, while also providing services through which applications run. Thus option B is correct. Drawing pictures or playing sound may be done by applications, and an operating system cannot generate electrical power.

The governing concept is hardware abstraction through system software. A device driver translates or coordinates operating-system commands so that a particular printer, graphics device, keyboard, or other hardware can respond correctly. Therefore option C is correct. A driver does not create backups, increase physical memory, or change the monitor’s size; those are unrelated functions.