What is the primary function of a cache in a computer system?

B. To speed up data access by storing frequently used data

What does the term "fragmentation" refer to in memory management?

A. Inefficient use of memory space

D. The size of the memory cache

B. The process of combining free memory blocks

What limitation does the external pager face in the separation model?

B. It runs slower than hardware

C. It cannot directly access hardware bits like R and M

What is the role of the page table in a virtual memory system?

B. To map virtual addresses to physical addresses

D. To handle input/output operations

A. To store the physical addresses of all processes

Which of the following best describes the term "thrashing" in a virtual memory context?

B. Excessive swapping of pages in and out of memory

What is the main advantage of using a multi-level page table?

A. It reduces the size of the page table

C. It simplifies the memory management unit

B. It increases the speed of memory access

In a memory management system, what does the term "page replacement" refer to?

B. The method of swapping out a page in memory for a new page

A. The process of moving data from disk to memory

D. The allocation of memory to processes

C. The technique of compressing memory data

What is the main disadvantage of using a single-level page table?

B. It can lead to excessive memory usage

D. It increases the speed of memory access

C. It does not support virtual memory

3. What does the OS do before switching to a new process?

B. Flushes the TLB and sets MMU to new page table

6. In page fault handling, what does the OS do if the requested page is invalid?

C. Terminates the process or sends an error signal

When using a memory-mapped file, which of the following statements is true?

C. The file contents are paged in on demand, not read in full immediately

A. All writes to memory are immediately flushed to disk

B. File I/O is handled entirely by kernel buffer copies

D. The entire file must be loaded into RAM before access

In a two-handed clock cleaning policy, what is the role of the front hand?

D. To write dirty pages to disk and advance

A. To choose the victim page for eviction

C. To schedule page table updates

7. What is the main benefit of separating policy and mechanism in paging?

C. Allows easier modification and testing of memory policies

10. Why does the operating system preload some pages when a process starts?

C. To reduce the chance of continuous page faults during startup

B. To increase CPU response time

D. To avoid conflicts between processes

9. What is the role of the TLB (Translation Lookaside Buffer) in paging?

C. To cache recent address translations for faster lookup

B. To convert physical addresses into virtual addresses

D. To choose which page to replace

What is the primary purpose of a page table in a virtual memory system?

B. To map virtual addresses to physical addresses

A. To store the physical addresses of all memory pages

D. To keep track of disk space usage

In a demand paging system, what occurs when a page fault happens?

B. The required page is loaded from disk into memory

A. The process is terminated immediately

D. The operating system ignores the request

What is the effect of increasing the page size in a paging system?

A. It reduces internal fragmentation

B. It increases the number of page faults

C. It decreases the size of the page table

D. It has no effect on performance

What is the purpose of the page replacement algorithm in a virtual memory system?

A. To determine which page to remove from memory

B. To increase the size of the page table

D. To optimize disk access speed

Which of the following best describes the term "working set" in the context of memory management?

B. The set of pages that a process is currently using

C. The amount of memory reserved for future use

D. The memory space that is not currently in use

A. The total memory allocated to a process

What is the main disadvantage of using a multi-level page table?

B. Slower access times compared to single-level tables

D. It does not support virtual memory

A. Increased complexity in memory management

In a two-handed clock cleaning policy, what is the role of the front hand?

D. To write dirty pages to disk and advance

A. To choose the victim page for eviction

C. To schedule page table updates

When a file is mapped into the process address space using a memory-mapped file, what happens to modified pages when the process exits?

C. They are automatically written back to the file on exit

B. They are immediately written to disk at each change

D. They are copied to swap space only

What is the purpose of the Translation Lookaside Buffer (TLB) in a virtual memory system?

B. To cache recent virtual-to-physical address translations

D. To track memory allocation for processes

A. To store the entire virtual memory

C. To manage page replacement algorithms

In a demand paging system, what happens when a page fault occurs?

B. The required page is loaded from disk into memory

C. The CPU is halted until the page is available

D. The page is swapped out immediately

Which of the following best describes the term "working set" in the context of memory management?

B. The set of pages that a process is currently using

A. The total amount of memory allocated to a process

C. The pages that are swapped out to disk

D. The memory space reserved for system processes

What is the primary purpose of the Translation Lookaside Buffer (TLB) in a virtual memory system?

B. To cache recent translations of virtual addresses to physical addresses

D. To increase the size of the page table

A. To store all virtual addresses

C. To manage page replacement algorithms

In a virtual memory system, what does the term "page replacement" refer to?

B. The method of swapping out pages in memory for new pages

A. The process of loading pages from disk into memory

D. The technique of compressing pages to save space

C. The act of deleting pages from the page table

Which of the following is a consequence of having a smaller page size in a paging system?

B. Decreased number of page faults

D. Reduced internal fragmentation

What is the main function of a page replacement algorithm in a virtual memory system?

A. To determine which page to remove from memory

D. To allocate memory for new processes

B. To increase the size of the page table

How does the Least Recently Used (LRU) algorithm decide which page to evict?

A. It evicts the page that has been used the least recently

B. It evicts the page that is the largest

C. It evicts the page that is the oldest

D. It evicts the page that is currently in use

What is the impact of page size on the performance of a virtual memory system?

A. Larger page sizes can lead to increased internal fragmentation

D. Larger page sizes decrease the size of the page table

B. Smaller page sizes reduce the number of page faults

C. Page size has no effect on performance

Which of the following is an advantage of using shared libraries

C Reduced memory usage and disk space

Which of the following best describes the term "page fault" in a virtual memory system?

B. A request for a page that is not currently in memory

D. A successful memory allocation

C. The process running out of memory

What is the primary function of the page replacement algorithm?

B. To determine which pages to swap out of memory

A. To increase the size of the page table

D. To optimize disk I/O operations

OSGs

Quiz

•

Science

•

University

•

Practice Problem

•

Hard

Lê Khang

Used 2+ times

FREE Resource

52 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

10 sec • 1 pt

What does the PC (Program Counter) store?

A. Current instruction

B. Address of the next instruction

C. Address of the last executed instruction

D. Value of the operand

2.

MULTIPLE CHOICE QUESTION

10 sec • 1 pt

What causes a page fault?

A. Division by zero

B. CPU overheating

C. Referencing a page not in memory

D. Stack overflow

3.

MULTIPLE CHOICE QUESTION

10 sec • 1 pt

What is the purpose of the backing store?

A. To permanently store user files

B. To hold system logs

C. To hold pages that are not in main memory

D. To back up BIOS

4.

MULTIPLE CHOICE QUESTION

10 sec • 1 pt

In virtual memory systems, what does "swapping" refer to?

A. Switching CPUs

B. Transferring processes between main memory and disk

C. Changing OS versions

D. Altering thread priorities

5.

MULTIPLE CHOICE QUESTION

10 sec • 1 pt

What is DMA used for in memory systems?

A. CPU process management

B. Fast data transfer without CPU intervention

C. Data compression

D. Instruction decoding

6.

MULTIPLE CHOICE QUESTION

10 sec • 2 pts

What happens if the OS restarts an instruction that was auto-incremented before a page fault?

A. Nothing is required

B. The register must be increased again

C. The OS must decrease the register before retrying

D. Instruction cannot be restarted

7.

MULTIPLE CHOICE QUESTION

5 sec • 1 pt

What is the unit of memory that the OS uses in paging?

A. Segment

B. Page

C. Block

D. Frame

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52 questions

What does the PC (Program Counter) store?

What causes a page fault?

What is the purpose of the backing store?

In virtual memory systems, what does "swapping" refer to?

What is DMA used for in memory systems?

What happens if the OS restarts an instruction that was auto-incremented before a page fault?

What is the unit of memory that the OS uses in paging?

Which of the following is a valid page replacement algorithm?

What is the primary function of a cache in a computer system?

Which of the following is a characteristic of a thrashing condition?

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