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Operating System Objective Question with Answers | Page-2

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Download in pdf on Operating System multiple choice questions(MCQs) and answers. These quiz objective questions are important for graduate, under-graduate & competitive examinations NIELIT, BCA, B.Sc. MCA, M.Sc(IT), BE, B.Tech, CCNA, MCSE etc.
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(11) Virtual memory is
[A] an extremely large main memory
[B] an extremely large secondary memory
[C] a type of memory used in super computers
[D] an illusion of an extremely large memory

Comment

Answer: Option [D]
(12) Overlay is
[A] a specific memory location
[B] a part of an operating system
[C] overloading the system with many user files
[D] a single contiguous memory that was used in the olden days for running large programs by swapping.

Comment

Answer: Option [D]

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(13) The only state transition that is initiated by the user process itself is
[A] block
[B] wakeup
[C] dispatch
[D] none of the above

Comment

Answer: Option [A]
(14) Kernel is
[A] the software which monitors the operating system
[B] the set of primitive functions upon which the rest of operating system functions are built up
[C] considered as the critical part of the operating system
[D] none of the above

Comment

Answer: Option [B]
(15) Sector interleaving in disks is done by
[A] the operating system
[B] the disk manufacturer
[C] the disk controller cord
[D] none of the above

Comment

Answer: Option [A]
(16) Dirty bit is used to show the
[A] wrong page in the memory
[B] page with corrupted data
[C] page that is less frequently accessed
[D] page that is modified after being loaded into cache memory

Comment

Answer: Option [D]
(17) The first-fit, and the worst-fit algorithm can be used for
[A] linked allocation of memory
[B] indexed allocation of memory
[C] contiguous allocation of memory
[D] all of the above

Comment

Answer: Option [C]
(18) In a paged memory, the page hit ratio is 0.35. The time 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
[A] 3.0 ns
[B] 68.0 ns
[C] 68.5 ns
[D] 78.5 ns

Comment

Answer: Option [C]
(19) In a multi-user operating system, 20 requests are made to use a particular resource per hour on an average. The probability that no requests are made in 45 minutes is
[A] e-15
[B] e-5
[C] 1 - e-5
[D] 1 – e-10

Comment

Answer: Option [D]
(20) Disk scheduling involves deciding
[A] which disk should be accessed next
[B] the order in which disk access requests must be serviced
[C] the physical location where files should be accessed in the disk
[D] none of the above

Comment

Answer: Option [B]

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