Q251. 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
Answer : c
Q252. 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
Answer : c
Q253. 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
Answer : d
Q254. 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
Answer : b
Q255. SATA stands for
a) Serial Advanced Technology Attachment
b) Serious Advanced Technology Attachment
c) Serial Advanced Technology Attach
d) Serial Advanced Techno Attachment
Answer : a
Q256. a multiprogramming environment
a) more than one process resides in the memory
b) the programs are developed by more than one person
c) the processor executes more than one process at a time
d) a single user can execute many programs at the same time
Answer : a
Q257. In which of the following directory systems, is it possible to have multiple complete paths for a file starting from the root directory?
a) Single level directory
b) Two level directory
c) Tree structured director
d) cyclic graph directory
Answer : d
Q258. Which of the following is true?
a) The linkage editor links object modules during compiling or assembling.
b) The linkage editor links object modules and resolves external references between them before loading.
c) The linkage editor resolves external references between the object modules during execution time.
d) The linkage editor is used to edit programs which have to be later linked together.
Answer : b
Q259. Fence register is used for
a) file protection
b) CPU protection
c) memory protection
d) all of the above
Answer : coming soon
Q260. If the property of locality of reference is well pronounced in a program
a) the number of page faults will be more
b) the number of page faults will be less
c) execution will be faster
d) Both (B) and (C)
Answer : c