Operating System Set 17
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This set of Operating System (OS) Multiple Choice Questions & Answers (MCQs) focuses on Operating System Set 17
Q1 | The is used as an index into the page table.
- frame bit
- page number
- page offset
- frame offset
Q2 | The table contains the base address of each page in physical memory.
- process
- memory
- page
- frame
Q3 | The size of a page is typically
- varied
- power of 2
- power of 4
- none of the mentioned
Q4 | If the size of logical address space is 2 to the power of m, and a page size is 2 to the power of n addressing units, then the high order bits of a logical address designate the page number, and the low order bits designate the page offset.
- m, n
- n, m
- m – n, m
- m – n, n
Q5 | The operating system maintains a table that keeps track of how many frames have been allocated, how many are there, and how many are available.
- page
- mapping
- frame
- memory
Q6 | Paging increases the time.
- waiting
- execution
- context – switch
- all of the mentioned
Q7 | Smaller page tables are implemented as a set of
- queues
- stacks
- counters
- registers
Q8 | The page table registers should be built with
- very low speed logic
- very high speed logic
- a large memory space
- none of the mentioned
Q9 | For larger page tables, they are kept in main memory and a points to the page table.
- page table base register
- page table base pointer
- page table register pointer
- page table base
Q10 | For every process there is a
- page table
- copy of page table
- pointer to page table
- all of the mentioned
Q11 | Time taken in memory access through PTBR is
- extended by a factor of 3
- extended by a factor of 2
- slowed by a factor of 3
- slowed by a factor of 2
Q12 | Each entry in a translation lookaside buffer (TLB) consists of
- key
- value
- bit value
- constant
Q13 | If a page number is not found in the TLB, then it is known as a
- tlb miss
- buffer miss
- tlb hit
- all of the mentioned
Q14 | An uniquely identifies processes and is used to provide address space protection for that process.
- address space locator
- address space identifier
- address process identifier
- none of the mentioned
Q15 | The percentage of times a page number is found in the TLB is known as
- miss ratio
- hit ratio
- miss percent
- none of the mentioned
Q16 | Memory protection in a paged environment is accomplished by
- protection algorithm with each page
- restricted access rights to users
- restriction on page visibility
- protection bit with each page
Q17 | When the valid – invalid bit is set to valid, it means that the associated page
- is in the tlb
- has data in it
- is in the process’s logical address space
- is the system’s physical address space
Q18 | When there is a large logical address space, the best way of paging would be
- not to page
- a two level paging algorithm
- the page table itself
- all of the mentioned
Q19 | is the concept in which a process is copied into the main memory from the secondary memory according to the requirement.
- paging
- demand paging
- segmentation
- swapping
Q20 | The pager concerns with the
- special support from hardware is required
- special support from operating system is essential
- special support from both hardware and operating system is essential
- user programs can implement dynamic loading without any special support from hardware or operating system
Q21 | In paged memory systems, if the page size is increased, then the internal fragmentation generally
- becomes less
- becomes more
- remains constant
- none of the mentioned
Q22 | Swap space exists in
- primary memory
- secondary memory
- cpu
- none of the mentioned
Q23 | When a program tries to access a page that is mapped in address space but not loaded in physical memory, then
- segmentation fault occurs
- fatal error occurs
- page fault occurs
- no error occurs
Q24 | Effective access time is directly proportional to
- page-fault rate
- hit ratio
- memory access time
- none of the mentioned
Q25 | In FIFO page replacement algorithm, when a page must be replaced
- oldest page is chosen
- newest page is chosen
- random page is chosen
- none of the mentioned