Basic components of a computer system

Information quality includes currency, meaning that important records should be up to date. If a clinician relies on an outdated patient record, current symptoms, medicines, allergies, or test results may be missed, creating a risk of an incorrect or incomplete medical decision. Therefore option C is correct. An old record does not itself increase computer speed or security, and it cannot automatically change identity.

Version control is a file-management and collaboration practice that records successive changes to a digital document. It helps identify who changed information, compare revisions, resolve conflicting edits, and restore an earlier working version if a mistake occurs. Therefore option D is correct. It does not convert a file into an image, disable the internet, or reduce the number of collaborators.

The governing concept is deletion and recovery in an operating system. Deleted items are often placed in the Recycle Bin first, allowing a user to restore them. Emptying the bin removes those stored items from the normal recovery location, so option A is correct: they are normally deleted permanently, subject to system-specific recovery tools. It does not move files to the desktop, restart the computer, or close folders.

The governing concept is fast temporary storage close to a processor or another frequently used component. Cache memory keeps copies of commonly needed instructions or data so they can be accessed faster than from slower main memory or storage. Therefore option C is correct. It is not a printer, permanent video archive, or network-control feature, so options A, B, and D are unsuitable.

The governing concept is computer memory. ROM, or Read-Only Memory, retains essential instructions such as startup or firmware instructions even when the power is turned off, so option B is the best answer. RAM is the memory generally associated with temporary working data. ROM does not specifically play videos or transmit internet signals, which are functions of other hardware and software.

The governing concept is CPU clock speed: it indicates how many basic processing cycles the processor can perform per second, usually expressed in hertz, megahertz, or gigahertz. Therefore, option A is correct. Storage capacity belongs to drives, screen resolution describes display detail, and ink level concerns a printer. Clock speed alone does not determine total performance because cores, architecture, cache, and software also matter.

A traditional hard disk stores bits by changing magnetic patterns on the surfaces of rotating platters. The platters spin so the required track passes beneath the read/write head, and the head detects or changes the magnetic patterns. Therefore option C is correct. Printing, sound amplification, and touch input are functions of other peripherals, not the disk’s mechanical storage mechanism. Moving parts also cause latency and wear.

An SSD stores data in electronic flash memory, so it can retrieve information without waiting for a platter to rotate or a mechanical head to move to a track. This removes important mechanical delays and usually gives faster access than a traditional hard disk. Option D is correct. Paper, internet dependence, and sound signals have no role in explaining SSD access speed, although the exact speed also depends on the interface and controller.

Storage capacity is the amount of data a non-volatile device, such as an SSD, hard disk, or memory card, can retain for long-term use. Memory capacity usually refers to working memory such as RAM, which temporarily holds programs and data currently in use. Thus option A is correct. Both are not printing devices, RAM is generally volatile rather than permanent, and storage can hold many data types, not only sound.

Partitioning divides one physical storage drive into two or more logical sections. Each partition can have its own file system and drive designation, allowing users to organize an operating system, applications, and personal files separately. Therefore option A is correct. Partitioning does not change monitor resolution, reduce the computer’s physical weight, or refill printer ink. It is an organizational arrangement, not an increase in physical capacity.

When power is applied, BIOS or modern UEFI firmware begins the startup process and performs a Power-On Self-Test, commonly called POST. It checks essential hardware such as memory, processor-related functions, and connected devices before attempting to load the operating system. Therefore option A is correct. BIOS does not normally delete files, establish the internet connection first, or print a document during this initial check.

The control unit is a major part of the CPU. It fetches and decodes instructions, then sends timing and control signals so that the arithmetic and logic unit, registers, memory, and input/output units perform the required steps in the correct order. Therefore option C is correct. The ALU performs calculations and logical comparisons, secondary storage retains data, and an audio output device presents sound rather than coordinating processing.

Cache memory is a small, high-speed memory located close to or within the processor. It temporarily stores frequently used instructions and data, reducing the time the CPU needs to access slower main memory. Therefore, option C is correct. It is not an external backup device, does not store paper documents, and does not generate internet signals; those descriptions do not relate to cache memory.

The CMOS battery supplies a small amount of power to preserve the real-time clock and firmware settings when the computer is switched off. If this battery becomes weak, the date and time may reset repeatedly. Thus, option D is correct. Large memory, high monitor resolution, and a dusty keyboard do not normally affect the system clock or retain its settings.

The governing concept is volatility of memory. Volatile main memory, normally represented by RAM, needs continuous electrical power to retain its current contents. When the computer is switched off or loses power, unsaved information in that memory is generally lost, making option B correct. Volatile does not mean unchanging, internet-only, or limited to pictures; therefore options A, C, and D confuse volatility with unrelated properties.

The governing concept is software installation and uninstallation. A program may place shared libraries, configuration files, shortcuts, services, and system entries in locations outside its main folder. Deleting only that folder can leave these components behind and may cause errors. Thus, option B is correct. It does not break the monitor, make memory permanent, or automatically disconnect the internet. The operating system’s uninstall process is safer.

RAM is the computer’s short-term working memory for currently running programs and their active data. When several demanding applications require more RAM than is available, the operating system may use slower storage as temporary support, causing delays, sluggish responses, or freezing. Thus option D is correct. Low RAM does not increase storage capacity, printer speed, or monitor quality.

The governing concept is the CPU’s control unit. It fetches and decodes instructions, then sends control signals so the arithmetic-logic unit, memory, and input/output devices perform operations in the correct sequence. Therefore, option A is correct. Printing, permanent storage, and sound recording are jobs of other devices or components; the control unit coordinates them rather than carrying out those tasks itself.

The governing concept is POST, or the power-on self-test. During startup, firmware checks essential hardware such as memory, the processor, and input or display components. Repeated beep patterns may report that a hardware check has failed before the operating system loads, so option C is correct. The exact pattern is manufacturer-dependent and should be checked in the device manual. Printing, internet speed, and free storage do not explain startup beep codes.

The governing concept is the hardware design of solid-state storage. An SSD stores persistent data in flash-memory cells and accesses them electronically, so it does not need a motor to spin platters or a mechanical head to seek a track. Removing those mechanical delays makes access fast and quiet. Option C is correct. Option B describes a hard disk, while A is fictional and D is false because SSDs retain data without power.

The governing concept is the balance between processor speed and available RAM. During heavy multitasking, many programs compete for limited main memory. When RAM is insufficient, the operating system may use virtual memory on slower storage, causing swapping, longer response times, and an overall slowdown. Therefore, option B is correct; the other choices describe effects unrelated to low memory.

The kernel is the privileged core of an operating system. It manages processor scheduling, memory allocation, device communication, and essential system calls that allow applications to use hardware safely. Thus option D is correct. Drawing in documents, choosing web colors, and playing music are application-level tasks; an application may request kernel services for them, but those tasks are not the kernel's primary role.

The governing concept is memory integrity. Faulty RAM cells can return incorrect values or fail during reads and writes, so applications may crash unpredictably, data may become corrupted, or the entire system may become unstable. Therefore option D is correct. Printer ink, monitor dimensions, and mouse-cable length are unrelated to defective main memory. A memory diagnostic can help confirm the suspected fault.

The governing concept is the input-process-output cycle. The input unit accepts data and instructions from a user through devices such as a keyboard, mouse or scanner, then sends them to the computer for processing. Therefore, option A is correct. Printing belongs to the output function, permanent storage belongs to storage devices, and cooling is handled by fans or other cooling equipment.

The governing concept is the role of the Control Unit within the CPU. It fetches, decodes and directs the execution of instructions, coordinating the movement of data and control signals among the processor, memory and other components. Hence, option B is correct. Displaying images, printing files and recording sound are functions of output or input devices, not the primary responsibility of the Control Unit.