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When can a page fault occur?

Answer and explanation

Correct answer: When a needed memory page is not currently in RAM

Direct answer: Option A is correct. A page fault occurs when a program refers to a virtual memory page that is not currently present in main memory, or RAM. The operating system notices this event, finds the required page in secondary storage if available, loads it into a suitable RAM frame, and then allows the instruction to continue. Thus, a page fault is a normal memory-management event; it does not necessarily mean that the computer is permanently damaged. Option A gives exactly the required condition. Option B is wrong because the amount of paper in a printer is unrelated to virtual-memory pages. Option C is wrong because a clean mouse pad affects mouse movement, not RAM contents. Option D is wrong because a blue monitor display does not indicate that a memory page is absent. Exam cue: page fault means “needed page absent from RAM,” not a physical page falling down.

Related tags

Page FaultMemoryPaging

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