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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