Q261. With a single resource, deadlock occurs
a) if there are only two processes competing for that resource
b) if there is a single process competing for that resource
c) if there are more than two processes competing for that resource
d) none of the above
Answer : c
Q262. Supervisor call
a) is a call with control functions
b) is a call made by the supervisor of the system
c) are privileged calls that are used to perform resource management functions, which are controlled by the operating system.
d) is a call made by someone working in root directory
Answer : coming soon
Q263. Working set (t, k) at an instant of time, t, is the set of
a) k references with high frequency
b) pages that have been referenced in the last k time units
c) k future references that the operating system will make
d) future references that the operating system will make in the next ‘k’ time units
Answer : b
Q264. Concurrent processes are processes that
a) overlap in time
b) do not overlap in time
c) are executed by a processor at the same time
d) none of the above
Answer : a
Q265. In paged memory systems, if the page size is increased, then the internal fragmentation generally
a) becomes more
b) becomes less
c) remains constant
d) none of the above
Answer : a
Q266. Which of the following is an example of a SPOOLED device?
a) The secondary memory device in a virtual memory system.
b) A line printer used to print the output of a number of jobs.
c) The terminal used to enter the input data for a program being executed.
d) None of the above
Answer : b
Q267. The page replacement policy that sometimes leads to more page faults when the size of the memory is increased is
a) FIFO
b) LRUC no such policy exists
c) none of the above
Answer : a
Q268. An operating system contains 3 user processes each requiring 2 units of resource R. The minimum number of units of R such that no deadlock will ever occur is
a) 3
b) 4
c) 5
d) 8
Answer : coming soon
Q269. At a particular time of computation, the value of a counting semaphore is 7. Then 20 P operations and ‘x’ V operations were completed on this semaphore. If the final value of the semaphore is 5. x will be
a) 15
b) 22
c) 18
d) 14
Answer : c
Q270. Which of the following are single-user operating systems?
a) MS-DOS
b) UNIX
c) XENIX
d) Both (A) and (C)
Answer : d