ASS2 OS RETEST

In FIFO page replacement algorithm, when a page must be replaced ___________

• newest page is chosen

• oldest page is chosen

• random page is chosen

• none of the mentioned

Because of virtual memory, the memory can be shared among ____________

• threads

• instructions

• processes

• none of the mentioned

A process is thrashing if ____________

• it is spending more time paging than executing

• it is spending less time paging than executing

• page fault occurs

• swapping can not take place

Which algorithm chooses the page that has not been used for the longest period of time whenever the page required to be replaced?

• first in first out algorithm

• additional reference bit algorithm

• least recently used algorithm

• counting based page replacement algorithm

When a page fault occurs, the state of the interrupted process is ____________

• saved

• invalid

• disrupted

• none of the mentioned

When the page fault rate is low ____________

• the turnaround time increases

• the effective access time increases

• the effective access time decreases

• turnaround time & effective access time increases

The maximum number of frames per process is defined by ____________

• operating System

• the amount of available physical memory

• instruction set architecture

• none of the mentioned

In the ..... algorithm, the disk head moves from one end to the other, servicing requests along the way. When the head reaches the other end, it immediately returns to the beginning of the disk without servicing any requests on the return trip

• LOOK

• SCAN

• C-SCAN

• C-LOOK

In the ..... algorithm, the disk arm goes as far as the final request in each direction, then reverses direction immediately without going to the end of the disk.

• LOOK

• SCAN

• C-SCAN

• C-LOOK

Which file system does Windows 95 typically use?

• FAT 16

• FAT 32

• NTFS

• WNFS