System Software, Architecture, Memory and Storage Practice Test

Paging hinges on dividing memory into fixed-size blocks called pages, which lets the system map virtual pages to physical frames through a page table. The virtual address splits into a page number and an offset; the page number is used to find the frame where that page resides, and the offset addresses within that frame. This fixed-size, uniform unit system makes memory allocation simpler, eliminates external fragmentation, and supports efficient swapping between disk and RAM. The other statements mix in other concepts: segmentation uses variable-sized segments rather than fixed-size pages; paging is commonly implemented with demand loading (loading pages on demand, not all at startup); and virtual memory relies on a mapping between virtual and physical addresses, so saying there’s no mapping isn’t correct.