Virtual Memory Questions and Answers

Fixed partitions

A.     are very common in current operating systems.

B.     are very efficient in memory utilization.

C.     are very inefficient in memory utilization.

D.     are most used on large mainframe operating systems.

If a virtual memory system has 4 pages in real memory and rest must be swapped to disk. Which of following is the hit ratio for the following page address stream? Assume that memory starts emply. Use the First Out (FIFO) algorithm.

A.     A.10%

B.     15%

C.     C.21%

D.     D.31%

 

A computer system has 4 k word cahe organized ina block _set _associative manner, with 4 blocks per set ,64 words per block. The number of bits in the set and WORD fields of the main memory address format is

A.     15,4

B.     6,4

C.     7,2

D.     4,6

In a paged segment scheme of memory management , the segment table itself must have a page table because

A.     the  segment is spread over a number to hit in one page .

B.     each segment is spread over a number of pages.

C.     segment tables point to page tables and not to the physical location of the segment .

D.     the processor’s description base register points to a page table.

 

 

Which of the following statements is false?

 

A.     Segmentation suffers from external fragmentation.

B.     Paging suffers from internal fragmentation.

C.     Segmented memory can be paged.

D.     Virtual memory is used only in multi-user systems.