Which of the following is (are) true about virtual memory system that uses pages? (I) The virtual addres space can be larger than the amount of physical memory. (II) Programs must be resident in main memory throughout their execution. (III) Pages correspond to semantic characteriestics of the programs.

I only Explanation: To identify the correct statement, let's analyze each point based on standard Operating System principles: Statement (I): The virtual address space can be larger than the amount of physical memory. True: This is the primary purpose of virtual memory. It allows the execution of processes that may not fit entirely into the physical RAM by using disk space (swap space) to simulate additional memory. Statement (II): Programs must be resident in main memory throughout their execution. False: Virtual memory allows for demand paging . Only the currently required pages of a program need to be in physical RAM (main memory) at any given time. Other parts of the program remain on the disk until they are needed. Statement (III): Pages correspond to semantic characteristics of the programs. False: Pagi

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NIMCET 2008 Computer PYQ — Which of the following is (are) true about virtual memory system … | Mathem Solvex | Mathem Solvex

Explanation

To identify the correct statement, let's analyze each point based on standard Operating System principles:

Statement (I): The virtual address space can be larger than the amount of physical memory.

True: This is the primary purpose of virtual memory. It allows the execution of processes that may not fit entirely into the physical RAM by using disk space (swap space) to simulate additional memory.

Statement (II): Programs must be resident in main memory throughout their execution.

False: Virtual memory allows for demand paging. Only the currently required pages of a program need to be in physical RAM (main memory) at any given time. Other parts of the program remain on the disk until they are needed.

Statement (III): Pages correspond to semantic characteristics of the programs.

False: Paging is a physical division of memory. Memory is divided into fixed-size blocks (pages) regardless of the program's logic (like functions or data structures).
Note: It is Segmentation that corresponds to semantic characteristics (logical divisions like code, data, and stack).

Summary Table:

Statement	Status	Reason
(I)	True	Enables running large programs in small RAM.
(II)	False	Only the active pages need to be in RAM.
(III)	False	Pages are fixed-size physical units, not logical units.

Final Answer:

The correct option is (a) I only.

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