operating system Practice Questions Answers Test with Solutions & More Shortcuts

Question : 16

In two level scheme for page table, if one assume byte-level addressing and 4-kbyte (2 ¹² pages) then the 4-Gbyte (2 ³²) virtual address space is composed of

a) 2 ¹⁰ pages

b) 2 ²⁰ pages

c) 2 ³⁰ pages

d) 2 ⁴⁰ pages

Question : 17

In memory management when demand cleaning policy is applied

a) A modified page is written before their page frames are needed to so that pages can be written out in batches.

b) A page is written out to secondary memory only when it has been selected for replacement.

c) A and B both true.

d) None of these.

Question : 18

Which is the correct definition of a valid process transition in an operating system?

a) Wake up: ready ? running

b) Dispatch: ready? running

c) Block: ready ? running

d) Timer runout : ready ? blocked

Question : 19

A situation where two or more processes coordinate their activities based on a condition is referred as

a) Synchronization

b) Dead lock

c) Starvation

d) Par begin

Question : 20

User-visible register

a) Enables machine language programmer to minimize main memory reference by optimizing register use.

b) Enables assembly language programmer to minimize main memory reference by optimizing register use.

c) A and B both true.

d) A and B both false.