Memory Management MCQs – T4Tutorials.com

What is the primary purpose of memory management in an operating system? A) To prevent hardware failures B) To allocate and deallocate memory to processes C) To schedule CPU tasks D) To manage input/output devices Answer: B) To allocate and deallocate memory to processes Which of the following is a key function of memory management? A) Process synchronization B) File system management C) Memory allocation D) Device management Answer: C) Memory allocation In which memory management technique does each process have a separate memory space? A) Contiguous allocation B) Segmentation C) Paging D) Fragmentation Answer: B) Segmentation Which of the following memory allocation schemes allows non-contiguous allocation of memory to processes? A) Paging B) Contiguous memory allocation C) Fixed partitioning D) Single-user system Answer: A) Paging What problem is addressed by the concept of virtual memory? A) Insufficient CPU speed B) Limited physical memory C) Overuse of input/output devices D) Fragmentation of memory Answer: B) Limited physical memory Which type of memory fragmentation occurs when there are small gaps between allocated memory blocks? A) Internal fragmentation B) External fragmentation C) Paging D) Thrashing Answer: B) External fragmentation What is the main goal of the paging memory management technique? A) To avoid memory fragmentation B) To allocate large blocks of memory C) To reduce CPU scheduling time D) To increase input/output performance Answer: A) To avoid memory fragmentation In virtual memory, what is a page fault? A) When a process exceeds its memory allocation B) When the operating system crashes C) When a page is not found in main memory D) When a process is waiting for I/O Answer: C) When a page is not found in main memory Which of the following is an advantage of segmentation over paging? A) No external fragmentation B) No internal fragmentation C) Easier implementation D) Logical division of program modules Answer: D) Logical division of program modules What is the role of the memory management unit (MMU)? A) To manage input/output operations B) To handle disk scheduling C) To map virtual addresses to physical addresses D) To control access to the CPU Answer: C) To map virtual addresses to physical addresses Which of the following is used to reduce the page fault rate? A) Increasing page size B) Reducing the number of processes C) Increasing physical memory D) Using a smaller swap space Answer: C) Increasing physical memory In a paging system, what is the purpose of a page table? A) To keep track of free memory blocks B) To map virtual pages to physical frames C) To manage process synchronization D) To store file metadata Answer: B) To map virtual pages to physical frames What is thrashing in the context of memory management? A) Excessive swapping of pages in and out of memory B) A process that crashes due to a lack of memory C) When the CPU is idle due to memory constraints D) When memory blocks become fragmented Answer: A) Excessive swapping of pages in and out of memory Which type of memory allocation results in internal fragmentation? A) Fixed partitioning B) Paging C) Dynamic partitioning D) Segmentation Answer: A) Fixed partitioning Which of the following best describes demand paging? A) Loading the entire process into memory at once B) Swapping processes out of memory when not needed C) Loading pages into memory only when they are referenced D) Allocating fixed memory spaces for each process Answer: C) Loading pages into memory only when they are referenced What is the primary disadvantage of using large page sizes in a paging system? A) Increased page table size B) Higher internal fragmentation C) More frequent page faults D) Increased memory access time Answer: B) Higher internal fragmentation Which memory allocation method uses variable-sized blocks to minimize wasted memory? A) Fixed partitioning B) Segmentation C) Paging D) Contiguous allocation Answer: B) Segmentation In which memory management technique is a process divided into equal-sized blocks? A) Segmentation B) Paging C) Fixed partitioning D) Dynamic partitioning Answer: B) Paging What is the purpose of a translation lookaside buffer (TLB)? A) To speed up CPU scheduling B) To cache page table entries C) To manage input/output devices D) To prevent memory fragmentation Answer: B) To cache page table entries Which of the following describes external fragmentation? A) Unused memory within an allocated block B) Memory that is not allocated to any process C) Free memory scattered across the system D) Memory blocks that are too small to allocate Answer: C) Free memory scattered across the system Which type of memory allocation requires processes to be stored contiguously in memory? A) Paging B) Segmentation C) Contiguous memory allocation D) Dynamic memory allocation Answer: C) Contiguous memory allocation In a system using paging, what happens when a page table entry is invalid? A) A page fault occurs B) The process is terminated C) The memory is locked D) The operating system reboots Answer: A) A page fault occurs What is the main advantage of dynamic partitioning over fixed partitioning? A) Better CPU utilization B) Less external fragmentation C) No internal fragmentation D) Increased disk space usage Answer: C) No internal fragmentation Which of the following is NOT a benefit of virtual memory? A) Allows processes to use more memory than physically available B) Provides process isolation C) Reduces input/output operations D) Simplifies memory allocation Answer: C) Reduces input/output operations Which of the following best describes a page frame? A) A logical block of memory B) A physical block of memory in RAM C) The size of a process’s virtual memory D) The size of the operating system’s memory Answer: B) A physical block of memory in RAM What is a swap space in the context of virtual memory? A) A portion of RAM reserved for swapping processes B) Disk space used to temporarily store pages C) Space in RAM dedicated to paging D) Extra cache memory used for storing processes Answer: B) Disk space used to temporarily store pages Which of the following is a disadvantage of segmentation? A) Internal fragmentation B) Complicated memory access C) Increased CPU overhead D) External fragmentation Answer: D) External fragmentation In a multi-level page table, what is the purpose of multiple levels? A) To reduce the size of the page table B) To increase memory access speed C) To prevent page faults D) To allow for larger page sizes Answer: A) To reduce the size of the page table What is the main purpose of a memory compaction technique? A) To increase memory access speed B) To reduce fragmentation by merging free memory blocks C) To swap pages in and out of memory D) To allocate contiguous blocks of memory Answer: B) To reduce fragmentation by merging free memory blocks Which of the following algorithms is used to replace pages in memory? A) First-In-First-Out (FIFO) B) Round-robin C) Shortest Job First D) Mutual exclusion Answer: A) First-In-First-Out (FIFO) What happens during memory swapping in operating systems? A) Processes are moved between RAM and disk B) Pages are transferred between the CPU and memory C) The operating system reboots D) CPU registers are cleared Answer: A) Processes are moved between RAM and disk Which of the following can cause thrashing in a system? A) Too many processes in memory B) Large page sizes C) Excessive CPU utilization D) Insufficient disk space Answer: A) Too many processes in memory Which of the following best defines internal fragmentation? A) Memory wasted inside an allocated block B) Memory that is unallocated to any process C) Free memory located between allocated blocks D) Memory blocks that are too large to allocate Answer: A) Memory wasted inside an allocated block Which page replacement algorithm replaces the page that has not been used for the longest period of time? A) First-In-First-Out (FIFO) B) Least Recently Used (LRU) C) Optimal page replacement D) Random replacement Answer: B) Least Recently Used (LRU) In a paging system, what is the purpose of the valid/invalid bit in the page table entry? A) To check if a page is in memory or on disk B) To determine if the page is writable C) To track the size of the page D) To indicate the age of the page Answer: A) To check if a page is in memory or on disk Which of the following is a benefit of using virtual memory? A) Increased CPU utilization B) Allows larger processes to run than physical memory allows C) Reduced complexity in memory management D) Elimination of page faults Answer: B) Allows larger processes to run than physical memory allows What does the term ‘working set’ refer to in memory management? A) The total memory allocated to a process B) The set of pages currently in memory that a process is actively using C) The number of processes that can be swapped into memory D) The size of the process’s memory space Answer: B) The set of pages currently in memory that a process is actively using Which memory management technique allows for memory allocation without dividing memory into fixed-size blocks? A) Paging B) Fixed partitioning C) Dynamic partitioning D) Contiguous allocation Answer: C) Dynamic partitioning What is the primary benefit of using a multi-level page table in a paging system? A) Reducing memory access time B) Reducing the size of the page table C) Increasing page size D) Preventing page faults Answer: B) Reducing the size of the page table Which of the following describes the optimal page replacement algorithm? A) It replaces the page that will not be used for the longest time in the future B) It replaces the least recently used page C) It randomly selects a page to replace D) It replaces the oldest page in memory Answer: A) It replaces the page that will not be used for the longest time in the future In a demand paging system, which of the following occurs when a page is not found in memory? A) Segmentation fault B) Page fault C) System crash D) Disk read error Answer: B) Page fault What is the primary drawback of using a single-level page table in large systems? A) High memory access time B) Larger page sizes C) Limited number of processes D) High memory overhead Answer: D) High memory overhead Which of the following memory management techniques can lead to external fragmentation? A) Paging B) Fixed partitioning C) Segmentation D) Dynamic partitioning Answer: C) Segmentation

Memory Management MCQs
By: Prof. Dr. Fazal Rehman | Last updated: September 20, 2024

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