Hardware vs. Software basics.

Hardware abstraction hides device details and gives a simple interface. For exams connect it with the middle role of system software.

The kernel is the main control part of the operating system. For exams understand applications as software with fewer privileges than the kernel.

Normal programs run with limited rights in user mode. For exams connect deep hardware control with kernel mode.

A system call lets an application use system services in a controlled way. For exams connect it with communication between application and kernel.

A device driver creates communication between hardware and the operating system. For exams do not treat a driver as a physical device.

Firmware works very close to hardware. For exams understand it as a link between hardware and software.

Firmware is related to basic device control so a wrong update can be serious. For exams remember firmware update as an update needing care.

Secure boot can help block unauthorized boot code. For exams connect it with UEFI and security.

It performs a basic check of essential hardware when the computer starts. For exams connect it with the beginning role of BIOS or UEFI.

A bootloader helps load the operating system during startup. For exams remember the boot sequence in steps.

Direct memory access can help fast data transfer. For exams connect it with hardware and memory relation.

Interrupt helps respond quickly to an event. For exams identify these terms in input output management.

A buffer is a temporary memory area that manages the difference in data-transfer speeds between components. For example, rapidly arriving input data can be held in a buffer until the processor or output device is ready to process it. Option B describes permanent storage, whereas a buffer is temporary. Exam tip: remember a buffer as ‘temporary storage for handling a speed mismatch.’

The direct answer is option A. Cache and buffer are related but not identical. A cache stores copies of data that may be requested repeatedly, allowing faster access the next time it is needed. A buffer temporarily stores data during transfer between a producer and a receiver, especially when the two operate at different speeds. For example, incoming audio may wait in a buffer while a device processes it. Therefore option A correctly says that cache gives frequently used data quickly and buffer handles data transfer. Option B is wrong because a monitor is output hardware and a keyboard is input hardware; neither word is the definition of cache or buffer. Option C is unrelated: cache and buffer are not printer paper. Option D is false because neither one is always a virus; viruses are malicious programs, while cache and buffer are normal computing mechanisms. Cache is mainly about faster repeated access, whereas buffer is mainly about managing flow and waiting during transfer. Memory cue: cache helps reuse; buffer helps transfer.

Memory management unit helps memory access at hardware level. For exams connect it with operating system and processor relation.

Virtual address shows memory to a program in a simple form. For exams keep logical and real addresses separate.

In a page fault the system brings needed data into memory. For exams connect it with memory management.

The direct answer is option A, because storage can be slower than RAM. Swapping is a memory-management method used when available RAM is not enough. The operating system moves some less-active data from RAM to storage, such as an SSD or hard disk, and brings it back when needed. Storage is generally slower to access than RAM, especially a hard disk. If the system swaps excessively, it spends much time moving data between RAM and storage instead of running programs. This repeated movement can make the computer respond very slowly. Option A is correct. Option B is wrong because a monitor becoming physically heavy has no connection with swapping or memory speed. Option C is nonsensical: a keyboard does not eat paper, and that cannot explain swapping. Option D is also unrelated because a speaker does not become a file. The real chain is: insufficient RAM, frequent movement to storage, slower access, and reduced performance. Swapping is not automatically harmful, but excessive swapping is a warning that memory resources are under pressure. Memory cue: RAM is the fast working desk; storage is the slower cupboard.

A memory leak is a software fault that can increase RAM use. For exams see how software faults affect hardware resources.

A thread can be understood as a smaller unit of software execution. For exams do not treat process and thread as hardware.

Multithreading is software design but can affect CPU use. For exams understand relation between software structure and hardware resources.

These are software tools that help in creating and running programs. For exams connect them with advanced concepts of system software.

A linker helps in the process of software creation. For exams do not treat it as a hardware device.

A loader places a program into memory before execution. For exams remember the movement of program from storage to RAM.

An application programming interface helps programs use services. For exams keep it separate from user interface.