OSGs

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

What causes a page fault?

• A. Division by zero

• B. CPU overheating

• C. Referencing a page not in memory

• D. Stack overflow

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

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

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

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

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

• A. Segment

• B. Page

• C. Block

• D. Frame

Which of the following is a valid page replacement algorithm?

• A. FIFO

• B. LILO

• C. FIT

• D. CACHE

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

• C. To manage memory allocation

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

• D. To execute instructions

• A. To store data permanently

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

• A. High CPU utilization

• D. Low disk activity

• B. Excessive page faults

• C. Efficient memory usage