Operating System Mcqs

Page No. 31

To obtain better memory utilization, dynamic loading is used. With dynamic loading, a routine is not loaded until it is called. For implementing dynamic loading ____________


aspecial support from hardware is required


bspecial support from operating system is essential


cspecial support from both hardware and operating system is essential


duser programs can implement dynamic loading without any special support from hardware or operating system



In a paged memory, the page hit ratio is 0.35. The required to access a page in secondary memory is equal to 100 ns. The time required to access a page in primary memory is 10 ns. The average time required to access a page is?


a3.0 ns


b68.0 ns


c68.5 ns


d78.5 ns


View Answer 68.5 ns

When there is a large logical address space, the best way of paging would be ____________


anot to page


ba two level paging algorithm


cthe page table itself


dall of the mentioned



Illegal addresses are trapped using the _____ bit.


aerror


bprotection


cvalid – invalid


daccess


View Answer valid – invalid

When the valid – invalid bit is set to valid, it means that the associated page ____________


ais in the TLB


bhas data in it


cis in the process’s logical address space


dis the system’s physical address space



Memory protection in a paged environment is accomplished by ____________


aprotection algorithm with each page


brestricted access rights to users


crestriction on page visibility


dprotection bit with each page



The percentage of times a page number is found in the TLB is known as ____________


amiss ratio


bhit ratio


cmiss percent


dnone of the mentioned


View Answer hit ratio

An ______ uniquely identifies processes and is used to provide address space protection for that process.


aaddress space locator


baddress space identifier


caddress process identifier


dnone of the mentioned



If a page number is not found in the TLB, then it is known as a ____________


aTLB miss


bBuffer miss


cTLB hit


dAll of the mentioned


View Answer TLB miss

Each entry in a translation lookaside buffer (TLB) consists of ____________


akey


bvalue


cbit value


dconstant


View Answer key

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