Operating System Objective Question with Answers | Page-3

Questions
21 In 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: Option [A]
22 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 directory
D Acyclic graph directory

Answer: Option [D]
23 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: Option [B]
24 Fence register is used for
A file protection
B CPU protection
C memory protection
D all of the above

Answer: Option [C]
25 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: Option [D]
26 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: Option [D]
27 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: Option [C]
28 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: Option [B]
29 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: Option [A]
30 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: Option [A]