OS IITU QUIZ

1. Linux developed by

Andrew Tannenbaum

Bill Gates

Linus Torvalds

Mark Zyckerberg

2. What are the numeric equivalents of the alphabetic permisson bits?

R = 1, w = 2, x = 3

R = 5, w = 3, x = 1

R = 4, w = 2, x = 1

R = 4, w = 1, x = 0

3. Which command would you use to set full permission for the owner and group and no permission to other users

Chmod 440 /home/projects/os

Chmod 770 /home/projects/os

Chmod 660 /home/projects/os

Chmod 550 /home/projects/os

4. What is the alternative of 361 permission?

Rw-r-x-wx

-wxrw---x

Rw-rw-r-x

Rw-r-x-x

5. How can we list particular directories?

Ls -t

Ls -r

Ls -a

Ls -d

6. What is the alternative of 421 permission?

Rw-r-x--x

R-xrw-wx

Rw-w-x--x

R---w---x

7. What are the permission types a UNIX file can be assigned

Read

Write

Execute

User

Group

Deploy

Submit

8. How many categories of Linux distributions are there?

3

1

2

4

9. How can we list directories with hidden files?

Ls -t

Ls -a

Ls -l

Ls -r

10. How many built-in-rules do iptables have?

3

4

1

2

Submit

12. Which of these funtions has security risks?

Fork()

System()

Exec()

13. What is the number equivalent of r-x--x--x

431

611

311

441

511

14. What is the number equivalent of r--rwxrw- permission

476

516

436

256

636

15. We can use both gzip -d and gunzip to decompress file

True

False

Submit

17. Enter the name of file that contains the user accoutn information for your system

/etc/passwd

/etc/password

/etc/shadow

/etc/gshadow

18. Which utility is used to modify file /etc/sudoers?

Psw

Su

Visudo

Gshadow

19. Choose the equivalent of @yearly special word

0 * * * *

0 0 1 1 *

0 0 * * *

0 0 * * 0

0 0 1 * *

20. What will be the output of the following program is we run it as ./quiz.sh 11

Condition is not met

Script won't run because of error

Condition is met

21. What is the alternative of 512 permission?

R-x-x-w--

R-xr-x-wx

R-x-rw-r-x

R-xrwx-wx

Submit

23. The user and group number of root is 0

True

False

24. Crontab is used to schedule commands to be executed only once

True

False

25. Which table used to alter packets that create a new connection.

Mangle

Nat

Filter

26. Select an(the) example(s) of free software

UTorrent Google Chrome

Linux

Mozilla Firefox FreeBSD KDE

Open Office

27. Input the number equivalent of rw-r-x--x permission

651

777

541

661

415

Submit

29. We use OR operation if we want to perform the action if one of several condtion is met

True

False

30. ? By default, a regular expression is case sensitive

True

False

Submit

32. Which file contains passwords for your groups?

/etc/passwd

/etc/password

/etc/shadow

/etc/gshadow

Submit

34. Which of the following belongs to commercial business distribution used mainly for internet servers?

Red Hat

Fedora

Gentoo

Debian

OpenSuse

35. When using command line arguments, what does $$ return?

Name of running script

Array containing all parameters

Word containing all parameters

Process ID of running script

Number of passed parameters

36. What is the umask for the definitions below?- read, execute for owner- read for group- write, execute for others

234

013

665

777

631

37. What is equivalent of -wxr-x-wx permission

414

353

212

636

565

38. What is PID of init process?

3

4

5

1

0

39. Choose the correct format of /etc/passwd file

Name:UID:password:group_number:comment:directory:start_program

UID:name:password:group_number:comment:directory:start_program

Name:password:UID:group_number:comment:directory:start_program

Group_number:name:UID:password:comment:directory:start_program

40. We can use both chown and chgrp to change the group ownership

True

False

41. How many approaches of mutex implementation are there?

4

2

3

5

42. Which signal is a program termination signal (kill will send this by default)?

SIGSTP

SIGQUIT

SIGINT

SIGTERM

SIGIOT

43. In concurrency, sharing global resources safety is difficult

True

False

44. What will be the output if we will run the following script: ./quiz.sh 4 3Filename: quiz.sh

C

Script won't run because of error

A

B

45. When using command line arguments, what does $0 return?

Number of passed parameters

Username of user running the script

Word containing all parameters

Array containing all parameters

Name of running script

46. What is the alternative of 543 permission?

R-xr---wx

R-xrw-r--

R--w-x--x

Rw-r-x-wx

47. Which table is the default table for handling network packets?

Nat

Mangle

Filter

48. Which table is used for specific types of packet alteration

Mangle

Filter

Nat

49. ? How can we make regular expression case insensitive?

By ending the pattern with "(?i)

By starting the pattern with "(?i)"

By ending the pattern with "(?c)

By starting the pattern with "(!i)"

50. When using command line arguments, what does $@ return?

Array containing all parameters

Word containing all parameters

Number of passed parameters

Process ID of running script

Name of running script

51. Which of the following distribution designed for advanced Linux users?

Red Hat

Gentoo

Fedora

Debian

Slackware

52. Which expression prints out the result of an expression?

Expr with command substitution

Expr

Double parentheses

Let

53. When using command line arguments, what does $0 return?

Name of running script

Array containing all parameters

Word containing all parameters

Number of passed parameters

Process ID of running script

54. How can you add read and execute permission to owner for file quiz.txt

Chmod u+rx quiz.txt

Chmod o=rx quiz.txt

Chmod u-rx quiz.txt

Chmod o+rx quiz.txt

Umask o+rx quiz.txt

55. Choose the correct format of /etc/gshadow file

UID:Name:Password:Admins:Users

Name:Password:Admins:Users

Name:UID:Password:Users:Admins

Password:Admins:Users:Name

56. In ACCEPT target the packet its handed over to the end application or the operationg system for processing

True

False

57. What command is used to modify a file's owner?

Ls

Chmod

Chown

Touch

58. Which permission belongs to 260 umask

R-xr-xr-x

R-x--xrwx

Rw---xr-x

R-x---rw-

59. Which signal is sent to a process when its controlling terminal is closed?

SIGINT

SIGKILL

SIGBUS

SIGSTP

SIGHUP

60. Select chains for filter table

FORWARD

INPUT

OUTPUT

POSTROUTING

Submit

61. What is a deadlock?

Interleaving of processes in time to give the appearance of simultaneous execution

Permanent blocking of a set of processes that either complete for global resources or communicate with each other

62. What option you should write, if you want to find all files?

-find files

-find d

-find f

Find -f

63. Open source is free software, software that the licensee can use without paying a license fee

True

False

64. In concurrency optimal allocation of resources is difficult

True

False

65. We should use chmod to set permission for newly created files

True

False

66. Which chain applies to network packets that are targeted for the host?

FORWARD

POSTROUTING

INPUT

PREROUTING

Submit

69. Which chain applies to locally-generated network packets?

FORWARD

INPUT

POSTROUTING

PREROUTING

OUTPUT

70. In which file the default parameters for new user are stored?

/etc/account.defaults

/etc/defaults

/etc/login.defs

/etc/login.defaults

/etc/defs

71. Match following signals with their definitions.

SIGINT

SIGTSTP

SIGHUP

Submit

72. The parent process of all process in Linux called root

True

False

Submit

74. There are 2 policies of deadlock prevention

True

False

75. Select chains for mangle table

INPUT

OUTPUT

FORWARD

POSTROUTING

PREROUTING

Submit

76. /etc/passwd contains password related information for accounts

True

False

77. Select the type(s) of OS

Real time operating systems

Single user, Single Task

Single user, Multi-tasking

Multi user, Multi-tasking

Multy user, Single-task

Submit

78. Multiple processes on a system with a single processor?

Multiprogramming

Multiprocessing

Distributed processing

Hold and wait

79. Which line executes the script chech_status.sh on 10th June 08:30 AM

30 08 10 06 * check_status.sh

10 06 30 08 * check_status.sh

30 08 06 10 * check_status.sh

08 30 10 06 * check_status.sh

80. Choose the correct answer for the following definition: "No process can be forces to release a resource"

Hold and Wait

No preemption

Mutual exclusion

Circular wait

81. Mint is one of the original Linux distributions sets, popular with Linux geeks

True

False

82. Foreground processes doesn't expect user input

True

False

83. Choose the correct definition for daemons

Is a background process

Start at system startup

They are started by user

Submit

84. Choose the correct answer for the following definition "A closed chain of processes exists, such that each process is blocked waiting for a resource held by another process in the set"

Circular wait

No preemption

Hold and wait

Mutual exclusion

85. Which of the following belong(s) to system level interface

Shell

Icons, windows, buttons

Applications

Invoked from programs

86. Match table names with their definitions

filter

mangle

nat

Submit

87. REJECT target works like the DROP target, but doesn't return an error message

True

False

88. Choose correct answer for following definition "A closed chain of processes exists, such that each process is blocked waiting for a resource held by another process in the set"

Circular wait

No preemption

Hold and Wait

Mutual Exclusion

89. Which permission belongs to 162 umask?

R-xrw-r-x

Rw-r-xr-x

Rwx--xrw-

Rw--xr-x

90. What will be the output if we will run script: ./quiz.sh 200Filename: quiz.sh

B

A

C

Script won't run because an error

91. Match the following signals with their definitions

SIGQUIT

SIGKILL

SIGTERM

Submit

92. When using expr we need to enclose the expression in quotes

True

False

93. Which permission belongs to 452 umask?

R---xrw-

Rw-r-xrwx

Rwxrw-r-x

-wx-w-r-x

94. Which of the following belong to user benefits?

Efficiency

Safety

Portability

Simplicity

Abstracts

Submit

95. Which of the following belongs to application benefits?

Portability

Programming simplicity

Safety

Efficiency

Abstracts

Submit

96. Choose the correct approach for the following definition "adopting a static policy that disallows one of the four conditions above."

Deadlock prevention

Deadlock detection and recovery

Deadlock avoidance

97. Select chains for NAT table

INPUT

OUTPUT

PREROUTING

FORWARD

POSTROUTING

Submit

98. What are the processes that are initialized and controlled through a terminal session?

Foreground

Background

Interactive

Submit

99. Match chain names to their definition

INPUT

FORWARD

OUTPUT

Submit

100. What are the levels of access control on UNIX systems?

Root

Other

User

Group

Administrator

Submit

101. In which of the following approaches there is no shared data?

Mutex

Semaphores

Monitors

Message passing

102. What is an Operating System?

A collection of software that manages computer hardware resources and provides common services for computer programs

It acts as an intermediary between a user and the computer system

A hardware layer to abstract away and manage details of software resources

The OS is a vital component of the system hardware in a computer system

Submit

103. Using which expression(s) we can write the result of and expression to variable?

Double parentheses

Expr with command substitution

Let

Expr

Submit

104. We can group a sequence of characters using open and close brackets

True

False

105. Choose the correct answer for the following definition "When one process is inside a critical section of entering that section"

Critical Section

Message Passing

Semaphores

Monitors

Mutual Exclusion

106. Match chain names to their definitions

POSTROUTING

OUTPUT

PREROUTING

Submit

107. What is the alternative of 165 permission?

--xr-x-wx

--xrw-r-x

-wxr-x-wx

--x-rw-r-x

OS Iitu Quiz

1. Linux developed by

2.

What first name or nickname would you like us to use?

2. What are the numeric equivalents of the alphabetic permisson bits?

3. Which command would you use to set full permission for the owner and group and no permission to other users

4. What is the alternative of 361 permission?

5. How can we list particular directories?

6. What is the alternative of 421 permission?

7. What are the permission types a UNIX file can be assigned

8. How many categories of Linux distributions are there?

9. How can we list directories with hidden files?

10. How many built-in-rules do iptables have?

11. What is the first program that is executed after system boot up?

12. Which of these funtions has security risks?

13. What is the number equivalent of r-x--x--x

14. What is the number equivalent of r--rwxrw- permission

15. We can use both gzip -d and gunzip to decompress file

16. What will you write in order to check whether the directory with name "quizzes" exist or not?Format: option dirname

17. Enter the name of file that contains the user accoutn information for your system

18. Which utility is used to modify file /etc/sudoers?

19. Choose the equivalent of @yearly special word

20. What will be the output of the following program is we run it as ./quiz.sh 11

21. What is the alternative of 512 permission?

22. How can you list all available signals?

23. The user and group number of root is 0

24. Crontab is used to schedule commands to be executed only once

25. Which table used to alter packets that create a new connection.

26. Select an(the) example(s) of free software

27. Input the number equivalent of rw-r-x--x permission

28. What you should write in order to get silent promt from user? Format: [command] [option(s)]

29. We use OR operation if we want to perform the action if one of several condtion is met

30. ? By default, a regular expression is case sensitive

31. What you should write in order to edit the list of cronjobs?

32. Which file contains passwords for your groups?

33. What will the output of following script if we run like: ./greet.sh teacher

34. Which of the following belongs to commercial business distribution used mainly for internet servers?

35. When using command line arguments, what does $$ return?

36. What is the umask for the definitions below?- read, execute for owner- read for group- write, execute for others

37. What is equivalent of -wxr-x-wx permission

38. What is PID of init process?

39. Choose the correct format of /etc/passwd file

40. We can use both chown and chgrp to change the group ownership

41. How many approaches of mutex implementation are there?

42. Which signal is a program termination signal (kill will send this by default)?

43. In concurrency, sharing global resources safety is difficult

44. What will be the output if we will run the following script: ./quiz.sh 4 3Filename: quiz.sh

45. When using command line arguments, what does $0 return?

46. What is the alternative of 543 permission?

47. Which table is the default table for handling network packets?

48. Which table is used for specific types of packet alteration

49. ? How can we make regular expression case insensitive?

50. When using command line arguments, what does $@ return?

51. Which of the following distribution designed for advanced Linux users?

52. Which expression prints out the result of an expression?

53. When using command line arguments, what does $0 return?

54. How can you add read and execute permission to owner for file quiz.txt

55. Choose the correct format of /etc/gshadow file

56. In ACCEPT target the packet its handed over to the end application or the operationg system for processing

57. What command is used to modify a file's owner?

58. Which permission belongs to 260 umask

59. Which signal is sent to a process when its controlling terminal is closed?

60. Select chains for filter table

61. What is a deadlock?

62. What option you should write, if you want to find all files?

63. Open source is free software, software that the licensee can use without paying a license fee

64. In concurrency optimal allocation of resources is difficult

65. We should use chmod to set permission for newly created files

66. Which chain applies to network packets that are targeted for the host?

67. What you should write in order to get list of cronjobs?

68. If we want the variable to be available to the other scripts, which command do we need?

69. Which chain applies to locally-generated network packets?

70. In which file the default parameters for new user are stored?

71. Match following signals with their definitions.

72. The parent process of all process in Linux called root

73. One account has elevated privileges to issue any command, access any file, and peform every function

74. There are 2 policies of deadlock prevention

75. Select chains for mangle table

76. /etc/passwd contains password related information for accounts

77. Select the type(s) of OS