OS Module-4 Quiz

What is the primary purpose of memory management?

• To manage network connections efficiently.

• To store user data permanently.

• The primary purpose of memory management is to efficiently allocate and manage computer memory resources.

• To increase the speed of the CPU.

Explain the concept of swapping in memory management.

• Swapping is a method to increase CPU speed by reallocating processor cores.

• Swapping refers to the process of compressing data in RAM to save space.

• Swapping is a technique in memory management that moves data between RAM and disk storage to optimize memory usage.

• Swapping is a technique that only involves moving data between different RAM modules.

What is contiguous memory allocation?

• Contiguous memory allocation involves dividing memory into multiple segments.

• Contiguous memory allocation is a method of allocating a single contiguous block of memory for a process.

• Contiguous memory allocation allows for dynamic resizing of memory blocks.

• It is a method of allocating memory in a non-linear fashion.

Define paging and its significance in memory management.

• Paging requires all processes to be stored in contiguous memory blocks.

• Paging is significant in memory management as it allows for efficient memory utilization, eliminates external fragmentation, and enables processes to be loaded into non-contiguous memory locations.

• Paging is only used in disk storage management.

• Paging is a method to compress data in memory.

What is the structure of a page table?

• Each entry in a page table contains only the virtual address.

• Page tables are structured as linked lists of pages.

• The page table consists only of physical addresses.

• The structure of a page table includes entries with frame numbers, status bits, and access permissions.

Describe the concept of segmentation in memory management.

• Segmentation is a memory management technique that divides memory into segments based on logical divisions of a program.

• Segmentation refers to the physical division of memory into fixed-size pages.

• Segmentation is a method for compressing data in memory to save space.

• Segmentation is a technique that combines all memory into a single block.

What is virtual memory and why is it used?

• Virtual memory is a type of physical storage device.

• Virtual memory allows for the permanent storage of data.

• Virtual memory is used to increase the speed of the CPU.

• Virtual memory is used to extend the available memory beyond physical RAM, allowing for more efficient multitasking and the ability to run larger applications.

Explain demand paging and its advantages.

• Demand paging is a method that requires all data to be in physical memory before execution.

• Demand paging increases memory usage by loading all programs at once.

• Demand paging eliminates the need for virtual memory entirely.

• Demand paging allows for efficient use of memory, reduces load times, and enables the execution of larger programs than the available physical memory.

What is copy-on-write in the context of memory management?

• Copy-on-write is a technique that immediately duplicates memory pages upon modification.

• Copy-on-write requires all memory pages to be copied before any changes are made.

• Copy-on-write is a method that prevents any sharing of memory pages between processes.

• Copy-on-write is a memory management technique that defers copying of shared memory pages until a modification is made.

What is thrashing and how can it be avoided?

• Thrashing is a type of virus that affects computer systems.

• Thrashing is excessive paging that degrades system performance, and it can be avoided by managing memory usage effectively.

• Thrashing is a method of data compression used in storage systems.

• Thrashing occurs when the CPU is overloaded with tasks and cannot process them.