Paging, Segmentation, and Virtual Memory MCQs

In a paging system, which of the following maps virtual addresses to physical addresses? A) Page table B) Segment table C) TLB D) Cache Answer: A) Page table What is a page fault in the context of virtual memory? A) An illegal memory access B) A page not found in main memory C) A process exceeding its memory limit D) The operating system crashing Answer: B) A page not found in main memory Which of the following best describes segmentation? A) Dividing memory into fixed-size blocks B) Dividing programs into variable-size segments C) Allocating memory contiguously D) Allocating memory based on process priority Answer: B) Dividing programs into variable-size segments What is the purpose of a translation lookaside buffer (TLB) in a paging system? A) To store data for quick CPU access B) To cache frequently used page table entries C) To manage virtual memory D) To perform memory compaction Answer: B) To cache frequently used page table entries Which of the following causes internal fragmentation? A) Fixed-size page allocation B) Variable-size segment allocation C) Excessive swapping D) Memory compaction Answer: A) Fixed-size page allocation What is a segment table used for in segmentation? A) Mapping virtual pages to physical frames B) Keeping track of segment locations in memory C) Allocating fixed memory blocks D) Mapping processes to processors Answer: B) Keeping track of segment locations in memory Which of the following leads to external fragmentation? A) Paging B) Segmentation C) Fixed partitioning D) Cache allocation Answer: B) Segmentation In a system using paging, what is stored in a page table entry? A) The size of the page B) The process ID C) The frame number of the physical memory D) The segment number Answer: C) The frame number of the physical memory Which of the following describes virtual memory? A) The physical memory installed on the system B) Memory that is accessed via the CPU cache C) A technique to extend the available memory using disk space D) The memory directly managed by the user Answer: C) A technique to extend the available memory using disk space What is the primary advantage of using paging over segmentation? A) Paging eliminates external fragmentation B) Paging supports variable-sized memory blocks C) Paging simplifies program structure D) Paging provides faster CPU access Answer: A) Paging eliminates external fragmentation Which of the following memory management techniques uses a page table? A) Segmentation B) Paging C) Contiguous memory allocation D) Fixed partitioning Answer: B) Paging What happens when the TLB does not contain a mapping for the requested page? A) A segmentation fault occurs B) The operating system crashes C) A TLB miss occurs, and the page table is accessed D) The page is swapped out Answer: C) A TLB miss occurs, and the page table is accessed Which type of fragmentation is more common in segmentation? A) Internal fragmentation B) External fragmentation C) Logical fragmentation D) Virtual fragmentation Answer: B) External fragmentation What is the primary role of the MMU (Memory Management Unit)? A) To manage disk I/O B) To allocate physical memory C) To translate virtual addresses to physical addresses D) To handle process synchronization Answer: C) To translate virtual addresses to physical addresses In a virtual memory system, what is swapping? A) Moving processes from main memory to disk and back B) Loading the entire process into memory C) Copying data between registers and cache D) Allocating contiguous blocks of memory Answer: A) Moving processes from main memory to disk and back What causes a page fault in a demand paging system? A) A process tries to access a page not in memory B) The page table is full C) The TLB has been cleared D) The memory is corrupted Answer: A) A process tries to access a page not in memory Which of the following is a key advantage of using virtual memory? A) Increased CPU speed B) Isolation between processes C) Elimination of paging D) Reduced disk usage Answer: B) Isolation between processes What is a segment fault in segmentation? A) When a process exceeds its allocated segment B) When a segment is swapped out to disk C) When a segment is not found in the page table D) When a process terminates unexpectedly Answer: A) When a process exceeds its allocated segment In a paging system, what is the purpose of page replacement? A) To allocate memory blocks contiguously B) To manage multiple processes in memory C) To replace pages in memory when the page table is full D) To replace pages that are least recently used Answer: D) To replace pages that are least recently used Which of the following occurs during a TLB hit? A) A page is swapped into memory B) The page table is accessed C) The page frame is found in the TLB D) A segmentation fault occurs Answer: C) The page frame is found in the TLB Which of the following memory management techniques is prone to internal fragmentation? A) Segmentation B) Paging C) Virtual memory D) Dynamic memory allocation Answer: B) Paging In a virtual memory system, which of the following is the result of excessive page faults? A) Thrashing B) Segmentation fault C) Memory leak D) Deadlock Answer: A) Thrashing What is the difference between paging and segmentation? A) Paging divides memory into fixed-size pages, while segmentation divides memory into variable-sized segments B) Segmentation is faster than paging C) Paging allocates memory contiguously, while segmentation does not D) Segmentation requires more physical memory than paging Answer: A) Paging divides memory into fixed-size pages, while segmentation divides memory into variable-sized segments What is the primary benefit of demand paging? A) Faster CPU performance B) Reduces the need for physical memory C) Eliminates the need for a page table D) Ensures all processes are fully loaded into memory Answer: B) Reduces the need for physical memory Which memory management technique allows for logical division of programs? A) Paging B) Segmentation C) Contiguous allocation D) Fixed partitioning Answer: B) Segmentation What happens when a page replacement algorithm replaces a page? A) The new page is added to the TLB B) The page table is updated to reflect the new page in memory C) The memory is cleared of all pages D) The CPU reallocates memory blocks Answer: B) The page table is updated to reflect the new page in memory Which of the following describes the concept of thrashing in a paging system? A) The process of continuously swapping pages in and out of memory B) The fragmentation of memory blocks C) The segmentation of large memory regions D) The compaction of memory blocks Answer: A) The process of continuously swapping pages in and out of memory What is a valid page table entry in paging? A) An entry that points to a valid page in physical memory B) An entry that points to a segment in memory C) An entry that marks a process as running D) An entry that indicates the size of the page Answer: A) An entry that points to a valid page in physical memory Which of the following algorithms is used to select a page for replacement in memory? A) FIFO B) LRU C) Round-robin D) Multilevel feedback queue Answer: B) LRU What is the primary role of the page frame in a paging system? A) It stores a process’s stack B) It holds a fixed-size block of physical memory C) It manages CPU registers D) It handles input/output devices Answer: B) It holds a fixed-size block of physical memory What is the main disadvantage of paging? A) External fragmentation B) Internal fragmentation C) Increased process synchronization time D) Lack of process isolation Answer: B) Internal fragmentation Which of the following best describes a page frame in virtual memory? A) A fixed-size block of physical memory B) A variable-size block of logical memory C) A portion of the TLB D) A file on disk that stores data Answer: A) A fixed-size block of physical memory What is the purpose of the valid/invalid bit in a page table entry? A) To indicate whether a page is in memory or on disk B) To show if a page is writable C) To track the age of a page D) To mark pages for deletion Answer: A) To indicate whether a page is in memory or on disk In virtual memory, what is the swap space? A) Space in RAM for memory paging B) Disk space used to temporarily store pages C) Memory allocated for I/O operations D) Cache space for frequently used pages Answer: B) Disk space used to temporarily store pages What is the role of a page fault handler in a paging system? A) To reload pages from disk into memory B) To update the page table for running processes C) To handle memory allocation errors D) To allocate more memory for processes Answer: A) To reload pages from disk into memory In paging, what does the frame number represent? A) The size of the physical page B) The index of the page in virtual memory C) The location of the page in physical memory D) The number of memory accesses Answer: C) The location of the page in physical memory What is the primary goal of memory segmentation? A) To improve memory utilization B) To provide logical separation of a process’s components C) To eliminate page faults D) To prevent memory leaks Answer: B) To provide logical separation of a process’s components Which of the following describes a segmented paging system? A) It divides memory into both fixed-size pages and variable-size segments B) It eliminates the need for a TLB C) It allocates memory contiguously D) It prevents fragmentation Answer: A) It divides memory into both fixed-size pages and variable-size segments What is the main benefit of virtual memory for programs? A) Faster memory access B) Larger addressable memory space C) Reduced process switching time D) Decreased memory overhead Answer: B) Larger addressable memory space Which of the following occurs during a page fault? A) The CPU accesses the page table B) The page is loaded from disk into memory C) The TLB is updated D) The program terminates Answer: B) The page is loaded from disk into memory What is the role of memory compaction in segmentation? A) To reduce internal fragmentation B) To combine free memory into contiguous blocks C) To allocate pages contiguously D) To prevent page faults Answer: B) To combine free memory into contiguous blocks Which of the following describes paging and segmentation combined in a system? A) Logical division into segments, further divided into pages B) Memory allocation based on priority C) Segmentation followed by compaction D) Contiguous allocation of both pages and segments Answer: A) Logical division into segments, further divided into pages Which of the following is a feature of virtual memory that separates it from physical memory? A) It requires disk access for page swapping B) It uses continuous blocks of memory C) It requires contiguous memory allocation D) It is directly accessed by the CPU Answer: A) It requires disk access for page swapping

Paging, Segmentation, and Virtual Memory MCQs
By: Prof. Dr. Fazal Rehman | Last updated: September 20, 2024

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