Top 550+ Solved Operating System (OS) MCQ Questions Answer
Q. Time taken in memory access through PTBR is
a. extended by a factor of 3
b. extended by a factor of 2
c. slowed by a factor of 3
d. slowed by a factor of 2
Q. Each entry in a translation lookaside buffer (TLB) consists of
a. key
b. value
c. bit value
d. constant
Q. If a page number is not found in the TLB, then it is known as a
a. tlb miss
b. buffer miss
c. tlb hit
d. all of the mentioned
Q. An uniquely identifies processes and is used to provide address space protection for that process.
a. address space locator
b. address space identifier
c. address process identifier
d. none of the mentioned
Q. The percentage of times a page number is found in the TLB is known as
a. miss ratio
b. hit ratio
c. miss percent
d. none of the mentioned
Q. Memory protection in a paged environment is accomplished by
a. protection algorithm with each page
b. restricted access rights to users
c. restriction on page visibility
d. protection bit with each page
Q. When the valid – invalid bit is set to valid, it means that the associated page
a. is in the tlb
b. has data in it
c. is in the process’s logical address space
d. is the system’s physical address space
Q. When there is a large logical address space, the best way of paging would be
a. not to page
b. a two level paging algorithm
c. the page table itself
d. all of the mentioned
Q. is the concept in which a process is copied into the main memory from the secondary memory according to the requirement.
a. paging
b. demand paging
c. segmentation
d. swapping
Q. The pager concerns with the
a. special support from hardware is required
b. special support from operating system is essential
c. special support from both hardware and operating system is essential
d. user programs can implement dynamic loading without any special support from hardware or operating system
Q. In paged memory systems, if the page size is increased, then the internal fragmentation generally
a. becomes less
b. becomes more
c. remains constant
d. none of the mentioned
Q. When a program tries to access a page that is mapped in address space but not loaded in physical memory, then
a. segmentation fault occurs
b. fatal error occurs
c. page fault occurs
d. no error occurs
Q. Effective access time is directly proportional to
a. page-fault rate
b. hit ratio
c. memory access time
d. none of the mentioned
Q. In FIFO page replacement algorithm, when a page must be replaced
a. oldest page is chosen
b. newest page is chosen
c. random page is chosen
d. none of the mentioned