operating system Practice Questions Answers Test with Solutions & More Shortcuts

Question : 11

Memory buffer register (MBR) contains

a) Data that is to be written into memory

b) A particular I/O device.

c) Exchange data between I/O module and the processor.

d) The instruction most recently fetched.

Question : 12

The demand paging and pre paging of virtual memory management are

• P - Fetch, Q -Demand paging, R -Prepaging;
• 1-Determines when a page should be bought into main memory. 2- A page is bought into main memory only when a reference is made to a location on that page. 3-Pages other than the one demanded by a page fault are bought in.

a) A - 1, B - 2, C - 3

b) A - 3, B - 2, C - 1

c) A - 2, B - 3, C - 1

d) A - 3, B - 1, C - 2

Question : 13

In memory management where replacement is allowed in First-in-First-out (FIFO) fashion

a) The page frames are allocated to a process as circular buffer and pages are removed in random order.

b) The page frames are allocated to a process as circular buffer and pages are removed in round-robin order.

c) Replaces the pages that are least referred.

d) Replaces the pages that are most referred.

Question : 14

Thrashing

a) the high paging activity

b) is spending more time in paging than executing

c) both A and B above

d) none of the above

Question : 15

In which of the following RAID scheme, redundancy is achieved by the simple expedient of duplicating all the data ?

a) RAID level 0

b) RAID level 1

c) RAID level 2

d) RAID level 3