operating system Practice Questions Answers Test with Solutions & More Shortcuts

Question : 46

The disk and tape devices are referred as

a) Block oriented I/O devices

b) Stream oriented I/O devices

c) Logical I/O devices

d) None of these

Question : 47

In 16 G byte disk with 512-bit block, the bit table requires

a) 1 M bytes

b) 2 M bytes

c) 3 M bytes

d) 4 M bytes.

Question : 48

Dirty bit for a page in a page table

a) helps avoid unnecessary writes on a paging device

b) helps maintain LRU information

c) allows only read on a page

d) none of the above

Question : 49

The term paging refers to

a) boosting up the priority of a process in multilevel of queues without feedback

b) gradually increasing the priority of jobs that wait in the system for a long time to remedy infinite blocking

c) keeping track of the time a page has been in memory for the purpose of LRU replacement

d) letting job reside in memory for a certain amount of time, so that the number of pages required can be estimated accurately

Question : 50

In virtual memory systems, dynamic address translation

a) is the hardware necessary to implement paging

b) stores pages at a specific location on disk

c) is useless when swapping is used

d) is the part of the operating system paging algorithm