Deck 3: Operating Systems

Question 1

Which of the following is not an attempt to provide security?

A) Passwords
B) Privilege levels
C) Multitasking

Answer 1

C

Question 2

A section of a program that should be executed by at most one process at a time is called a

A) Utility
B) Critical region
C) Privileged instruction

Answer 2

B

Question 3

Which of the following components of an operating system maintains the directory system?

A) Device drivers
B) File manager
C) Memory manager

Answer 3

B

Question 4

Which of the following would be a concern of the file manager in a multi-user computer system that would not be a concern in a single-user system?

A) Maintain records regarding the location of files
B) Maintain records regarding the ownership of files
C) Maintain records regarding the size of files
D) None of the above

Question 5

Which of the following concepts is not associated with critical regions?

A) Semaphores
B) Mutual exclusion
C) Bootstrap

Question 6

Which of the following items of information would not be contained in an operating system's process table?

A) The location of the memory area assigned to the process
B) The priority of each process
C) Whether the process is ready or waiting
D) The machine language instructions being executed by the process

Question 7

Which of the following components of an operating system is not part of the kernel?

A) User Interface
B) File manager
C) Scheduler

Question 8

Multitasking in a computer with only one CPU is accomplished by a technique called

A) Bootstrapping
B) Batch processing
C) Multiprogramming

Question 9

Which of the following is not a role of a typical operating system?

A) Control the allocation of the machine's resources
B) Control access to the machine
C) Maintain records regarding files stored in mass storage
D) Assist the computer user in the task of processing digital photographs

Question 10

Which of the following statements is true?

A) Allowing several processes to share time in a multiprogramming system is less efficient than executing each of them to completion one after the other.
B) The use of passwords provides an impenetrable safeguard.
C) Both A and B
D) Neither A not B

Question 11

Which of the following is a technique for controlling access to a critical region?

A) Spooling
B) Time sharing
C) Semaphore
D) Booting

Question 12

Which of the following events is detrimental to an operating system's performance?

A) Deadlock
B) Interrupt
C) Booting

Question 13

Which of the following components of an operating system is executed as the result of an interrupt signal?

A) Dispatcher
B) Memory manager
C) File manager

Question 14

Which of the following components of an operating system handles the details associated with particular peripheral equipment?

A) Device drivers
B) File manager
C) Memory manager

Question 15

Which of the following is a task that is not performed by the kernel of an operating system?

A) Communicate with the user
B) Schedule processes
C) Allocate resources
D) Avoid deadlock

Question 16

Which of the following would not require real-time processing?

A) Typing a document with a word processor
B) Navigation of an aircraft
C) Forecasting world-wide trend for the next five year period
D) Maintaining a airline reservation system

Question 17

Execution of an operating system is initiated by a program called the

A) Window manager
B) Scheduler
C) Boot loader

Question 18

Which of the following is not involved in a context switch?

A) Interrupt
B) Process table
C) Dispatcher
D) User Interface

Question 19

Which of the following is not a means of performing multiple activities at the same time?

A) Pipeling
B) Multiprogramming
C) Virtual memory
D) Multiple processors

Question 20

The end of a time slice is indicted by the occurrence of a signal called

A) An interrupt
B) A semaphore
C) A login

Question 21

Which necessary condition for deadlock is removed by each of the following.
A. Require processes to request all required resources at once.
________________________________________________________________
B. Allow only one process at a time in the process table.
________________________________________________________________
C. Take all resources from processes when deadlock occurs and restart the processes.
________________________________________________________________

Question 22

Fill in the blanks below with the part on the operating system (file manager,memory manager,device drivers,window manager,scheduler,dispatcher)that performs the activity described.
A. _______________ Executes each time a time slice terminates
B. _______________ Removes entries from the process table
C. _______________ Maintains a record of available mass storage space
D. _______________ Displays icons on the computer screen

Question 23

What problem could occur if,to allow more processes to share time in a multiprogramming environment,an operating system is designed to use very short time slices?
________________________________________________________________________

Question 24

Suppose an operating system allocates time slices in 10 millisecond units and the time required for a context switch is negligible.
A. How many processes can obtain a time slice in one second?
____________
B. How many processes can obtain a time slice in one second if half of them use only half of their
slice?
____________

Question 25

A ______________ is a set of instructions.In contrast,a ________________ is the activity of executing those instructions.

Question 26

Explain the difference between application software and system software.

Question 27

Fill in the blanks below with the part on the operating system (file manager,memory manager,device drivers,window manager,scheduler,dispatcher)that performs the activity described.
A. _______________ Places new entries in the process table
B. _______________ Performs the actual communication with I/O units
C. _______________ Maintains a record of memory allocations
D. _______________ Protects files from unauthorized access

Question 28

What conditions are necessary for deadlock to occur?

Question 29

Describe a scenario that leads to deadlock in a computer system.

Question 30

List three popular operating systems.
A. ___________________
B. ___________________
C. ___________________

Question 31

What is meant by the term load balancing in the context of multiprocessor computers?
________________________________________________________________________

Question 32

List three popular smartphone operating systems.
A. ___________________
B. ___________________
C. ___________________

Question 33

What action is performed as a result of executing each of the following types of instructions?
A. Test-and-set ________________________________________
B. Interrupt disable __________________________________________
C. Interrupt enable _______________________________

Question 34

List three features provided by modern CPUs that are used by operating systems to implement multitasking environments.
A. ___________________
B. ___________________
C. ___________________

Question 35

If it takes one microsecond to perform a context switch and processes use only half of their allotted 10 millisecond time slices,what percent of a CPUs time is spent performing context switches rather than executing processes?
____________

Question 36

Fill in the blanks below with the part on the operating system (file manager,memory manager,device drivers,window manager,scheduler,dispatcher)that performs the activity described.
A. _______________ Maintains a record of what is displayed on the computer's screen
B. _______________ Performs the switching from one process to another
C. _______________ Maintains the directory system
D. _______________ Creates virtual memory

Question 37

In each blank below write a term that might be considered the opposite of the term next to the blank.
A. _______________ Interactive processing
B. _______________ System software
C. _______________ Waiting process

Question 38

What are privileged instructions?

Question 39

List four resources whose access an operating system should coordinate.
A. ___________________________
B. _____________________________
C. ___________________________
D. _____________________________

Question 40

In contrast to early batch processing techniques,____________________ allows the user to communicate with the computer while the user's application is being executed.In turn,this type of processing requires that the computer's responses to its environment be performed in a timely manner,a requirement known as _______________________ .

Question 41

Why is a "test-and-set" instruction included in most machine languages for CPUs designed for multitasking environments?

Question 42

Describe concerns that occur when designing a time-sharing/multitasking operating system that do not occur in the case of a single tasking system.

Question 43

Explain why the average length of a time slice would be reduced if the processes in an operating system's process table perform lots of I/O operations.

Question 44

What is the difference between a process that is waiting as opposed to a process that is ready?

Question 45

Describe how the widespread availability of multi-core processors effects operating systems.

Question 46

In the sense of the term virtual memory,give an argument that multiprogramming creates virtual CPUs.

Question 47

Describe the bootstrap process.