Quiz about OSGs

Question 1

What does the PC (Program Counter) store?

Accepted Answer

B. Address of the next instruction

Answer

A. Current instruction

Answer

C. Address of the last executed instruction

Answer

D. Value of the operand

Question 2

What causes a page fault?

Accepted Answer

C. Referencing a page not in memory

Answer

A. Division by zero

Answer

B. CPU overheating

Answer

D. Stack overflow

Question 3

What is the purpose of the backing store?

Accepted Answer

C. To hold pages that are not in main memory

Answer

A. To permanently store user files

Answer

B. To hold system logs

Answer

D. To back up BIOS

Question 4

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

Accepted Answer

B. Transferring processes between main memory and disk

Answer

A. Switching CPUs

Answer

C. Changing OS versions

Answer

D. Altering thread priorities

Question 5

What is DMA used for in memory systems?

Accepted Answer

B. Fast data transfer without CPU intervention

Answer

A. CPU process management

Answer

C. Data compression

Answer

D. Instruction decoding

Question 6

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

Accepted Answer

C. The OS must decrease the register before retrying

Answer

A. Nothing is required

Answer

B. The register must be increased again

Answer

D. Instruction cannot be restarted

Question 7

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

Accepted Answer

B. Page

Answer

A. Segment

Answer

C. Block

Answer

D. Frame

Question 8

Which of the following is a valid page replacement algorithm?

Accepted Answer

A. FIFO

Answer

B. LILO

Answer

C. FIT

Answer

D. CACHE

Question 9

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

Accepted Answer

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

Answer

C. To manage memory allocation

Answer

D. To execute instructions

Answer

A. To store data permanently

Question 10

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

Accepted Answer

B. Excessive page faults

Answer

A. High CPU utilization

Answer

D. Low disk activity

Answer

C. Efficient memory usage

Question 11

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

Accepted Answer

A. Inefficient use of memory space

Answer

D. The size of the memory cache

Answer

C. The speed of memory access

Answer

B. The process of combining free memory blocks

Question 12

In terms of speed the best method of Dynamic Storage-Allocation is

Accepted Answer

A. First fit

Answer

B. Best fit

Answer

C. Worst fit

Answer

D. Next fit

Question 13

A computer with a 32-bit address uses a two-level page table. Virtual addresses are split into a 9-bit top-level page table field, an 11-bit second-level page table field, and an offset. How large are the pages?

Accepted Answer

B. 4-KB page

Answer

A. 2-KB page

Answer

C. 1-KB page

Answer

D. 512B page

Question 14

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

Accepted Answer

D. It replaces MMU

Answer

A. It uses kernel space

Answer

B. It runs slower than hardware

Answer

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

Question 15

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

Accepted Answer

B. To map virtual addresses to physical addresses

Answer

D. To handle input/output operations

Answer

A. To store the physical addresses of all processes

Answer

C. To manage CPU scheduling

Question 16

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

Accepted Answer

B. Excessive swapping of pages in and out of memory

Answer

C. High CPU performance

Answer

D. Low memory fragmentation

Answer

A. Efficient memory usage

Question 17

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

Accepted Answer

A. It reduces the size of the page table

Answer

C. It simplifies the memory management unit

Answer

B. It increases the speed of memory access

Answer

D. It eliminates page faults

Question 18

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

Accepted Answer

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

Answer

A. The process of moving data from disk to memory

Answer

D. The allocation of memory to processes

Answer

C. The technique of compressing memory data

Question 19

Which algorithm is commonly used to manage memory allocation in a system?

Accepted Answer

B. Least Recently Used (LRU)

Answer

C. Shortest Job First

Answer

D. First Come First Serve

Answer

A. Round Robin

Question 20

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

Accepted Answer

B. It can lead to excessive memory usage

Answer

D. It increases the speed of memory access

Answer

C. It does not support virtual memory

Answer

A. It is too complex to manage

Question 21

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

Accepted Answer

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

Answer

A. Deletes RAM contents

Answer

C. Reboots the system

Answer

D. Clears the screen

Question 22

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

Accepted Answer

C. Terminates the process or sends an error signal

Answer

A. Continues execution anyway

Answer

B. Loads a random page

Answer

D. Reboots the OS

Question 23

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

Accepted Answer

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

Answer

A. All writes to memory are immediately flushed to disk

Answer

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

Answer

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

Question 24

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

Accepted Answer

D. To write dirty pages to disk and advance

Answer

A. To choose the victim page for eviction

Answer

B. To pin pages in memory

Answer

C. To schedule page table updates

Question 25

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

Accepted Answer

C. Allows easier modification and testing of memory policies

Answer

A. Reduces CPU frequency

Answer

B. Makes page faults disappear

Answer

D. Avoids TLB flushing

Question 26

What is the mathematical formula for overhead memory in paging (given s, e, p)?

Accepted Answer

A. se/p + p/2

Answer

B. s*p + e

Answer

C. s/e + p*2

Answer

D. se*p/2

Question 27

5 Which strategy allows processes to share modifiable pages efficiently

Accepted Answer

B Copy on Write

Answer

A Static Linking

Answer

C Page Cleaning

Answer

D Thrashing

Question 28

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

Accepted Answer

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

Answer

A. To save disk space

Answer

B. To increase CPU response time

Answer

D. To avoid conflicts between processes

Question 29

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

Accepted Answer

C. To cache recent address translations for faster lookup

Answer

A. To store the entire RAM

Answer

B. To convert physical addresses into virtual addresses

Answer

D. To choose which page to replace

Question 30

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

Accepted Answer

B. To map virtual addresses to physical addresses

Answer

A. To store the physical addresses of all memory pages

Answer

C. To manage CPU scheduling

Answer

D. To keep track of disk space usage

Question 31

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

Accepted Answer

B. The required page is loaded from disk into memory

Answer

A. The process is terminated immediately

Answer

C. The CPU is reset

Answer

D. The operating system ignores the request

Question 32

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

Accepted Answer

A. It reduces internal fragmentation

Answer

B. It increases the number of page faults

Answer

C. It decreases the size of the page table

Answer

D. It has no effect on performance

Question 33

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

Accepted Answer

A. To determine which page to remove from memory

Answer

C. To manage CPU scheduling

Answer

B. To increase the size of the page table

Answer

D. To optimize disk access speed

Question 34

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

Accepted Answer

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

Answer

C. The amount of memory reserved for future use

Answer

D. The memory space that is not currently in use

Answer

A. The total memory allocated to a process

Question 35

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

Accepted Answer

B. Slower access times compared to single-level tables

Answer

D. It does not support virtual memory

Answer

A. Increased complexity in memory management

Answer

C. Higher memory consumption

Question 36

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

Accepted Answer

D. To write dirty pages to disk and advance

Answer

A. To choose the victim page for eviction

Answer

B. To pin pages in memory

Answer

C. To schedule page table updates

Question 37

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

Accepted Answer

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

Answer

A. They are discarded

Answer

B. They are immediately written to disk at each change

Answer

D. They are copied to swap space only

Question 38

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

Accepted Answer

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

Answer

D. To track memory allocation for processes

Answer

A. To store the entire virtual memory

Answer

C. To manage page replacement algorithms

Question 39

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

Accepted Answer

B. The required page is loaded from disk into memory

Answer

C. The CPU is halted until the page is available

Answer

D. The page is swapped out immediately

Answer

A. The process is terminated

Question 40

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

Accepted Answer

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

Answer

A. The total amount of memory allocated to a process

Answer

C. The pages that are swapped out to disk

Answer

D. The memory space reserved for system processes

Question 41

A system has processes with an average size of 64 MB. Each page table entry takes 8 bytes. What is the optimal page size in KB?

Accepted Answer

C. 32 KB

Answer

A. 512 KB

Answer

B. 1 MB

Answer

D. 96 KB

Question 42

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

Accepted Answer

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

Answer

D. To increase the size of the page table

Answer

A. To store all virtual addresses

Answer

C. To manage page replacement algorithms

Question 43

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

Accepted Answer

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

Answer

A. The process of loading pages from disk into memory

Answer

D. The technique of compressing pages to save space

Answer

C. The act of deleting pages from the page table

Question 44

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

Accepted Answer

A. Increased page table size

Answer

C. Improved access speed

Answer

B. Decreased number of page faults

Answer

D. Reduced internal fragmentation

Question 45

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

Accepted Answer

A. To determine which page to remove from memory

Answer

D. To allocate memory for new processes

Answer

C. To manage CPU scheduling

Answer

B. To increase the size of the page table

Question 46

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

Accepted Answer

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

Answer

B. It evicts the page that is the largest

Answer

C. It evicts the page that is the oldest

Answer

D. It evicts the page that is currently in use

Question 47

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

Accepted Answer

A. Larger page sizes can lead to increased internal fragmentation

Answer

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

Answer

B. Smaller page sizes reduce the number of page faults

Answer

C. Page size has no effect on performance

Question 48

Which of the following is an advantage of using shared libraries

Accepted Answer

C Reduced memory usage and disk space

Answer

A Bigger executable files

Answer

B Duplicated code in memory

Answer

D Static linking required

Question 49

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

Accepted Answer

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

Answer

A. A process being terminated

Answer

D. A successful memory allocation

Answer

C. The process running out of memory

Question 50

What is the primary function of the page replacement algorithm?

Accepted Answer

B. To determine which pages to swap out of memory

Answer

A. To increase the size of the page table

Answer

D. To optimize disk I/O operations

Answer

C. To manage CPU scheduling

Question 51

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

Accepted Answer

C. It can lead to higher internal fragmentation

Answer

A. It increases the number of page faults

Answer

B. It decreases the size of the page table

Answer

D. It improves the speed of memory access

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