Basic components of a computer system

A file extension is a name label that helps the operating system and applications expect a particular format; changing it alone does not rewrite the file's internal structure. Consequently, the associated software may issue a format error or fail to open it, making option B correct. Renaming is not conversion, and it does not automatically erase the file or shut down the computer.

Registers are very small, high-speed storage locations inside the CPU. They temporarily hold operands, instruction information, addresses, or intermediate results that the control unit and arithmetic-logic unit need immediately. Option A is correct because the short distance and specialized design provide extremely rapid access. Registers are not long-term backups, image-only storage, or internet-signal generators.

Cache and RAM are both volatile working memories, but they serve different levels of the memory hierarchy. Cache is usually much smaller and faster, storing frequently or recently needed data close to the CPU. RAM has greater capacity but is comparatively slower and farther from the processor. Therefore B is correct; neither is permanent storage, and cache is not limited to external devices.

The governing concept is delayed or buffered writing. A write cache temporarily keeps recently written data in faster memory before sending it to the storage device, improving responsiveness. If power fails or the system crashes before the data is committed, those pending changes may be lost or a file may become inconsistent. Option A states this risk; the other options are unrelated hardware effects.

The governing concept is hardware compatibility. A memory module must match the motherboard’s supported type, physical slot, electrical requirements and often its speed specifications. If an unsupported module is installed, it may not fit, may not be detected, or may cause boot failure and instability. Therefore option D is correct. The other choices do not logically result from incompatible system memory.

The governing concept is stable power delivery. A power supply unit must provide sufficient wattage and suitable voltage to all components, especially when the processor or graphics hardware is under heavy load. If its capacity is inadequate, voltage may become unstable and the computer can shut down, restart or fail to operate reliably. Option B is correct; file renaming, pointer size and storage capacity are unrelated software or hardware effects.

The governing concept is passive heat transfer. A heat sink, usually made from a thermally conductive material, draws heat from a component such as a CPU and spreads it through fins over a larger surface area. Airflow from a fan can then remove that heat more effectively. Option D is correct. A heat sink does not generate internet signals, store files or amplify audio; those are unrelated functions.

The governing concept is graphics hardware architecture. A dedicated graphics card is a separate expansion component and commonly includes its own graphics processor and video memory. Integrated graphics is built into the processor or motherboard and often uses a portion of the computer’s main memory and shared system resources. Therefore option B is correct. Integrated graphics is not always external, and both alternatives incorrectly describe audio or storage functions.

Before installing an upgrade, the user must check physical dimensions, connector type, motherboard support, available power, and operating-system or driver compatibility. A component that fits physically may still fail if the system cannot supply power or communicate with it. Thus option C is correct; the other choices concern unrelated file, printer, or cleaning tasks.

Computer performance is the result of several interacting factors. Insufficient RAM can cause frequent use of slower storage, a nearly full or slow drive can delay access, overheating can reduce speed, and inefficient software can consume resources. Therefore option D is correct. The monitor, printer, and keyboard do not independently explain general processing performance.

RAM is the fast working area where the operating system and active programs keep data temporarily. When RAM is very low, the computer may move some data to slower storage and spend more time switching between tasks, even if the processor is fast. Thus option C is correct. Printer speed, monitor size, and key count do not determine available working memory.

Registers are very small storage locations located within the processor and used directly by the arithmetic and control operations. Because the CPU can access them with minimal distance and control overhead, they are generally faster than cache, which is larger and serves broader repeated-access needs. Therefore option A is correct; registers are not permanent file storage, image-only memory, or external parts.

The governing concept is hardware compatibility. Although installing two modules can increase the total RAM capacity, the motherboard must support their memory generation, form factor, speed range, voltage, slot arrangement, and maximum capacity. Mixed modules may work at a lower common speed or may cause instability if unsupported. Therefore option B is correct; the colour of a printer, wallpaper, and mouse-pad size do not affect RAM compatibility.

The governing concept is the data path between an input device and the processor. Signals normally pass through the device or input controller, a physical or logical port, and the computer’s internal communication pathway or bus before reaching the CPU. Since the device sends data but the CPU does not receive it, each part of this route should be checked. Printer cartridges, a monitor stand and a speaker cover cannot carry input data, so option A is correct.

The governing concept is the memory hierarchy, in which storage closer to the processor is generally faster and smaller. Registers are located inside or directly associated with the CPU and are fastest. Cache is next, followed by main RAM. ROM is generally slower for normal access than these high-speed working memories. Thus the broad order from fastest to slowest is registers, cache, RAM, then ROM, so option A is correct.

The governing concept is hardware compatibility. A memory module may fit physically but still be electrically or technically incompatible because the motherboard may not support its memory generation, speed, organization, or maximum capacity. Thus option D is correct. Monitor colour, printer paper, and speaker power do not affect whether the motherboard can identify installed memory.

The governing concept is the memory hierarchy, in which location and access distance strongly affect speed. Registers are tiny storage locations inside the CPU, so the processor can access their operands and intermediate results with extremely low delay. RAM is also fast, but it is outside the CPU and is used for a larger working space. Registers are not hard-disk or network storage, and they do not store only permanent instructions; therefore C is correct.

The governing concept is cache-based performance improvement. Cache stores frequently or recently used instructions and data close to the CPU, reducing the time needed to access them. Without cache, the computer can still use RAM, so files are not automatically deleted and the monitor or keyboard need not stop working. However, repeated requests may require more direct RAM access, increasing waiting time and lowering performance; hence D is correct.

The governing concept is that a computer is an integrated system rather than a single component. The CPU processes instructions, memory holds active data, storage preserves files, input devices supply information, output devices present results, software directs operations, and the user gives meaningful commands. Therefore, option B is correct. Option A ignores all supporting parts, option C exaggerates RAM, and option D confuses display with processing.

The governing concept is bottleneck analysis: the component most closely responsible for a task can limit total performance. Complex calculations require instruction execution and arithmetic operations, which are primarily handled by the processor. With adequate RAM and fast storage already specified, option A is the strongest answer. A monitor displays results, a printer produces hard copies, and a network switch routes network traffic; none normally performs the calculation itself.

The governing concept is the instruction cycle, the repeated process by which the CPU runs a program. First, the fetch stage obtains the next instruction from memory. Next, decoding interprets the operation and identifies needed data. Finally, execution performs the operation and updates the result or state. Thus option D gives the correct order. The other sequences describe peripheral or file actions, not CPU instruction processing.

The governing concept is balanced system performance and bottleneck analysis. Graphics output depends on cooperation between the central processor, graphics processor, memory and software. If the CPU cannot prepare or send visual instructions quickly enough, the powerful graphics card may wait for work, so the CPU becomes the limiting factor. Thus, option B is correct. The graphics card does not transform into a CPU, and printer or sound-card behavior is unrelated to this visual-performance bottleneck.

The governing concept is a system bottleneck: overall performance depends on communication among components as well as on their individual speeds. A slow motherboard path limits how quickly data and instructions can travel between the processor, RAM and storage. Thus the faster parts may wait and fail to reach their full potential, making option A correct. The other choices describe unrelated or impossible effects.

The governing concept is memory hierarchy and physical proximity to the CPU. Registers are very small storage locations built into the processor, so the CPU can access their immediate instructions, operands and intermediate results with minimal delay. Their capacity is limited, but their access speed is extremely high. Option C is correct; the other choices incorrectly describe registers as user-file storage, disks or external devices.

The governing concept is locality of reference. Programs often reuse the same instructions or data, so cache keeps frequently accessed information in a small, fast memory near the CPU. When the needed item is found there, access takes less time than retrieving it from main memory. Therefore option D is correct. Cache is not a permanent backup, printer controller or printing device, as the other options suggest.