Operating System Mcqs

Page No. 32

A multilevel page table is preferred in comparison to a single level page table for translating virtual address to physical address because ____________


ait reduces the memory access time to read or write a memory location


bit helps to reduce the size of page table needed to implement the virtual address space of a process


cit is required by the translation lookaside buffer


dit helps to reduce the number of page faults in page replacement algorithms



Consider a computer with 8 Mbytes of main memory and a 128K cache. The cache block size is 4 K. It uses a direct mapping scheme for cache management. How many different main memory blocks can map onto a given physical cache block?


a2048


b256


c64


d8


View Answer 64

If there are 32 segments, each of size 1Kb, then the logical address should have ____________


a13 bits


b14 bits


c15 bits


d16 bits


View Answer 13 bits

The protection bit is 0/1 based on ____________


awrite only


bread only


cread – write


dnone of the mentioned


View Answer read – write

When the entries in the segment tables of two different processes point to the same physical location ____________


athe segments are invalid


bthe processes get blocked


csegments are shared


dall of the mentioned


View Answer segments are shared

If the offset is legal ____________


ait is used as a physical memory address itself


bit is subtracted from the segment base to produce the physical memory address


cit is added to the segment base to produce the physical memory address


dnone of the mentioned



The offset ‘d’ of the logical address must be ____________


agreater than segment limit


bbetween 0 and segment limit


cbetween 0 and the segment number


dgreater than the segment number



The segment limit contains the ____________


astarting logical address of the process


bstarting physical address of the segment in memory


csegment length


dnone of the mentioned


View Answer segment length

The segment base contains the ____________


astarting logical address of the process


bstarting physical address of the segment in memory


csegment length


dnone of the mentioned



Each entry in a segment table has a ____________


asegment base


bsegment peak


csegment value


dnone of the mentioned


View Answer segment base

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