MC0070-Operating Systems with Unix Model Question Paper

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Model Question Paper

Subject Code: MC0070

Subject Name: Operating systems with unix

Credits: 4 Marks: 140

Part A (One mark questions)

1. A sequence of instructions telling the computer what to do is called a_____________

A) program

B) language

C) translator

D) package

2. A process is _________________

A) program in main memory

B) Program in cache memory

C) program in secondary storage

D) program in execution

3. A _____________is a collection of processors that do not share memory, peripheral devices,

or a clock.

A) Computer system

B) distributed system

C) network

D) None of the above

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4. PVM stands for

A) Parallel Virtual Machine

B) Parallel Virtual Message

C) Process Virtual Machine

D) Process Virtual Monitor

5. In MS-DOS, the interfaces and levels of functionality are _______________

A) not well separated.

B) well separated

C) independent

D) dependent

6. ______________approach simplifies debugging and system verification.

A) Kernel

B) Layered

C) Extended

D) Virtual machine

7. A process may create a new process by executing ___________system call.

A) init

B) fork

C) create

D) new

8. A process control block contains varies attributes required by _____________ to control a

process.

A) RAM

B) virtual memory

C) BIOS

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D) Operating System

9. ______________is responsible for allocating primary memory to processes and for assisting

the programmer in loading and storing the contents of the primary memory.

A) Operating system

B) Memory manager

C) Database administrator

D) RAM

10. ______________ refers to the technology in which some space in hard disk is used as an

extension of main memory.

A) Cache memory

B) Paging

C) Virtual memory

D) Associative memory

11. ______________ selects a process from among the ready processes to execute on the

CPU.

A) CPU Scheduler

B) Loader

C) Dispatcher

D) Compiler

12. The time taken by the Dispatcher to stop one process and start another running is known as

_________________.

A) Turnaround time

B) Dispatch Latency

C) Access time

D) Response time

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13. When resources have multiple instances ________ is used for deadlock Avoidance.

A) Banker’s algorithm

B) Resource Allocation Graph

C) semaphores

D) all of these

14. ______________ is a situation in which two computer programs sharing the same resource

are effectively preventing each other from accessing the resource, resulting in both programs

ceasing to function.

A) Semaphore

B) Deadlock

C) Mutual Exclusion

D) No preemption

15. _______________occurs when two or more execution flows are able to run simultaneously.

a) Deadlock

b) Concurrency

c) race condition

d) interrupt

16.______________ occurs when multiple processes or threads read and write data items so that

the final result depends on the order of execution of instructions in the multiple processes.

a) Race condition

b) Mutual exclusion

c) Exception

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d) Interrupt

17. In Multics, a process could have up to 256K segments, but each segment was limited to

__________________ 64K words.

A) 64K

B) 32K

C) 1024K

D)112K

18.The problem with logical dumping is ________________

A) very costly

B) very slow

C) human errors

D) all of these

19. Because the I/O devices are not synchronized with the CPU, some information must be

exchanged between the CPU and the device to ensure that the data is received reliably. This

interaction between the CPU and an I/O device is usually referred to as ____________

A) polling

B) arbitration

C) handshaking

D) interrupting

20. ____________approach can place the data directly into the memory or take the data directly

from the memory without direct intervention from the processor.

A) DMA

B) Daisy chain arbitration

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C) polling

D) none of these

21. ____________ file system allows sharing in multiple different locations grouped under one

folder.

A) Direct

B) distributed

C) sequential

D) parallel

22. Windows 2000 supports -------------- type of file system

A) NTFS

B) EFS

C) FEFS

D) EFFS

23. In___________, the requesting device or devices assert the signal bus_request.

A) Priority encoded arbitration

B) Distributed arbitration by self-selection

C) Priority arbitration

D) Daisy chain arbitration

24. SRM stands for

A) Security Resource Manager

B) Secret Resource Manager

C) Security Reference Monitor

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D) Security Reference Manual

25. Initialization of I/O devices is part of the_________.

A) CPU

B) MSDOS

C) UNIX kernel

D) None of the above

26. BSD stands for_____________________

A) Basic Software Division

B) Berkeley Software Distribution

C) British Software Distribution

D) Berkeley Software data

27. Fsck conducts a check in _____ phases

A) One

B) Two

C) Five

D) Eight

28. Bootstrapping is also known as ______

A) cold-hot boot

B) hot boot

C) hot strap

D) cold boot

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29. Creation of a semaphore set is done using the _______system call.

A) semget()

B) semsget()

C) mknod()

D) sempget()

30. A shared memory segment first needs to be allocated (created), using

the__________ system call.

A) semget()

B) msgrcv()

C) shmget()

D) mknod()

31. The _________takes any characters from standard input, and then echoes them to

standard output.

A) kill character

B) cat command

C) cate command

D) control command

32. Pick the wrong statement from the following.

A) UNIX systems originally came with a command interpreter called the Bourne Shell.

B) The cat command takes any characters from standard input, and then echoes them to

standard output.

C) A pipe is a means of taking the output of one command and directing it as another command.

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D) The manual entry is called a man page, even though it is often more than one page long.

33. Which one of the following statements is true?

A) The cat command cares which file it receives as input or where the input goes.

B) Relative pathnames begin with something other than the slash character

C) UNIX shells never remember their current working directory (CWD).

D) The cat command interprets -X as an option character rather than a pathname.

34. When copying more than one file at a time, you must specify an existing directory as the

___________

A) Source

B) Sub directory

C) Destination.

D) Path name

35. The find command is different from most UNIX commands in that each of the

argument expressions following the beginning path name is considered a

_____________

A) action expression

B) Boolean expression.

C) Boolean constant

D) Search qualifiers

36. One of the wonderful things about UNIX is its ___________names.

A) Unlimited path

B) Unlimited directory

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C) Limited path

D) Limited file

37. RPN stands for

A) Reverse Polish Notation

B) Record Police Notation

C) Record Polish Notation

D) Reverse Police Negation

38. The usual su command syntax is

A) su-pwd

B) su-pd

C) su - userID

D) Sue- ID

39. ___________variable is not automatically created on all UNIX systems but is used by so

many programs that it is considered a standard environment variable.

A) IFS

B) MAIL

C) TERM

D) PATH

40.Choose the correct statement from the following.

A) In computer terminology, variables are symbols which stand for some value.

B) An alternative method for executing the commands in the file backup is to make the file as

directory.

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C) The restricted shell gives more control to the system administrator and restricts the options of

the user.

D) The decision making done by computer programs is in the form of conditional execution.

Part B (Two mark questions)

41. A program to be executed must be in ---------------

A) main memory

B) secondary memory

C) virtual memory

D) Read only memory

42. In layered approach each layer uses the functions and services of ------------------

A) kernel

B) lower-level layers

C) higher-level layers

D) all of these

43. ______________ are popular way to improve application through parallelism.

A) Processes

B) Threads

C) Context switching

D) none of these

44.__________ deals with when a modified page should be written out to secondary memory.

A) Cleaning policy

B) Fetch policy

C) Frame locking

D) None of these

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45. A solution to starvation is _____________.

A) segmentation

B) Aging

C) Paging

D) virtual memory

46. _______________refers to a strategy where whenever a resource is requested, it is only

granted if it cannot result in deadlock.

A) Deadlock Prevention

B) Livelock

C) Deadlock avoidance

D) none of these

47. When a child dies, it sends a _______________signal to its parent.

A) SIGCHLD

B) EDEADLK

C) WNOHANG

D) SEDECHLD

48. ______________is a mechanism the prevents two or more processes from accessing a

shared resource simultaneously.

A) Livelock

B)Preemption

C) Semaphore

D) either a) or b)

49. A two-byte integer called ____________is interpreted as an index into an array of inodes in

a fixed, known location on disk.

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A) an inode

B) an inumber

C) an imap

D) an imark

50. A SCSI device can transfer up to----------- of information per second.

A) 40 Mbytes

B) 60 Mbytes

C) 40 Gbytes

D) 60 Gbytes

51. The controller can access memory in memory cycles which are not used by the particular

bank of memory into which the DMA controller is writing data. This approach, called _________

A) interrupting

B) cycle stealing

C) swapping

D) paging

52. The two sub systems of user mode layer of windows 2000 are _________ and __________

A) excel, executive

B) environment, integral

C) orbit , kernel

D) Kernel , executive

53. A standard UNIX system includes a set of ___________ and a set of ___________.

A) Commands ,files

B) Libraries, Applications

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C) Libraries, files

D) Files, Applications

54. Ext2 is the standard file system of _______ and uses a block size of_____bytes

A) MS DOS,8K

B) Linux ,1024

C)Linux, 512

D)Unix, 512

55. An orphan process is automatically inherited by the _____and becomes a

_______ of this process.

A) 'init' process, father

B) 'init' process, child

C) 'initial’ process, father

D) 'it' process, child

56. An option commonly takes the form of a _____followed by __________characters.

A) dot, one or more

B) dash, only one

C) dash, one or more

D) dot,only two

57. Which of the following statements are true?

i. Filenames can be as long as 255 characters in System V Release 4 UNIX.

ii. Like cp, mv can handle multiple files if the destination is a file.

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iii. To change your umask, enter mask and a two digit number that specifies your new

umask.

iv. Named pipes enable you to communicate with a running program by reference to a file.

A) ii and iii

B) ii and iv

C) i and iv

D) i and iii

58.One reason why UNIX is so flexible is that each program is automatically assigned three

standard files. They are

A) The standard input file, the standard output file, and the standard error file.

B) The backup file, the standard output file, and the standard error file.

C) The standard input file, the standard output file, and the standard hidden file.

D) The standard input file, the standard search file, and the standard error file.

59. The id command reports four things. They are

A) The user ID number, login name, login password, and group name of the person who

invokes it.

B) The user password, login name, single ID number, and names of the persons who

invokes it.

C) The user password, login name, path number, and name of the person who

invokes it.

D) The user ID number, login name, group ID number, and group name of the person who

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invokes it.

60. Which of the following statements are true?

i. Normally, a looping construct executes all the commands between the do statement and

the done statement.

ii. In most higher level programming languages, variables are typed, meaning that they are

not restricted to certain kinds of data, such as numbers or characters.

iii. A program can get data in two ways: either it is passed to the program when it is executed

as arguments, or the program gets data interactively.

iv. Using the echo command in your program, you can determine whether a file exists,

whether it can be written to, and several other conditions.

A) i and iv

B) iii and iv

C) i, ii and iii

D) i and iii

Part C (Four mark questions)

61. Match the following

1. Operating system i). application software

2. Library system ii) system software

3. secondary storage iii) smaller capacity

4. Main memory iv) larger capacity

A) 1-ii, 2-i, 3-iv, 4-iii

B) 1-iv, 2-ii, 3-I, 4-iii

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C) 1-ii, 2-i, 3-iii, 4-iv

D) 1-iv, 2-I, 3-ii, 4-iii

62. Match the following.

a) QNX i. Bell Labs

b) MPI ii. CPU

c) gCore iii. Software package

D) Plan9 Operating System iv . Based on the microkernel design

A) a-i, b-iii, c-iv, d-ii

B) a-ii, b-iii, c-iv, d-i

C) a-iii, b-i, c-ii, d-iv

D) a-iv, b-iii, c-ii, d-i

63. Which of these is a reason for using threads in designing operating systems?

A) Unlike processes, threads are not independent of one another

B) All threads can access every address in the task .

C) Because threads can share common data, they do not need to use interprocess

communication.

D) Like processes, thread can create children.

64. Arrange the following memories in terms of increasing access time (from low to high)

1. Registers

2. Main memory

3. Secondary memory

4. Cache

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A) 1-3 -4 -2

B) 1-4-2-3

C) 3-2-4-1

D) 2-4-1-3


1. pipes i) continuously change their state

2. livelock ii) WNOHANG

3. Killing Zombies iii) fixed size

4. argument iv) web server

A) 1-iv, 2-iii, 3-I, 4- ii

B) 1-iii, 2-i , 3-iv, 4- ii

C) 1-ii , 2- I, 3-iv, 4-iii

D) 1-iii, 2-iv ,3-ii, 4- i

66. The introduction of mutual exclusion can prevent race conditions but can lead to problems

such as________________

A) deadlock

B) starvation

C) both a) and b)

D) none of these

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1. Programmed controlled I/O i. polled I/O

2. Interrupt controlled I/O ii. Cycle stealing

3. DMA iii. maskable and non maskable

A) 1-i, 2-iii, 3-ii

B) 1-ii, 2-iii, 3-i

C) 1-iii, 2-ii, 3-i

D) 1-i , 2-ii , 3-iii


1. Process manager i. Device detection and installation

2. IPC manager ii. Thread creation

3. PNP manager iii. Drawing windows and menus

4. Window manager iv . communication between clients.

A) 1- iv, 2-iii, 3- ii, 4- i

B) 1-ii, 2-iv, 3- i, 4-iii

C) 1- iii, 2-ii, 3-iv, 4- i

D) 1- iv , 2-ii, 3-iii, 4- i


a) kernel i) Switches between processes

b) Operating system ii) Initialization of I/O devices

c) Unix commands iii) Sells UnixWare

d) Novell iv) Case sensitive

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A) a-iv, b-ii, c-iii, d-i

B) a-ii, b-i, c-iv, d-iii

C) a-iii, b-i, c-ii ,d-iv

D) a-i, b-iii, c-iv, d-ii

70. State whether True (T) or False (F)

a. System files should be kept separate from data files created by users, and hence a

separate file system is usually made for them.

b. SVR5 systems define various run levels in which a specific set of processes are allowed

to run.

c. Login name identifies the user and computer hardware names.

d. Passwords are normally represented by a special encrypted format and are stored in the

file.

A) a-F, b-F, c-T, d-T

B) a-F, b- T, c- F, d-T

C) a-T, b-T, c-F, d-T

D) a-T, b-T, c-F, d-F


a) A named pipe i. FIFO

b) renice command ii. A resource that contains an integer value

c) child process iii. Change the priority of a process,

d) semaphore iv. zombie

A) a-iv, b-ii, c-iii, d-I


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a) exit i. version of C shell

b) tcsh ii. Control character

c) eof iii. Normal way to logout

d) TERM iv. Environment variable





73. State whether the following statements are True (T) or False (F)

a. When you copy a file into a directory, cp creates the new file with the different name.

b. The name cat derives from the word gatecate, which means to connect in a series or to

link together.

c. UNIX is a multiuser operating system, which means that you share the system with

other users.

d. There are no differences between hard and symbolic links.

A) a-T, b-T c-T, d-F

B) a-F, b-F, c-T d-T

C) a-T b-F, c-T ,d-F

D) a-F, b-F, c-T, d-F

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74. State whether the following statements are True (T) or False (F)

a. The ls command can also accept a filename as a command line parameter.

b. When a file is created, the path can inadvertently acquire printable numbers.

c. The -size n expression is a good example of a search criterion that is evaluated

numerically.

d. A program that takes standard file and creates standard input is sometimes called a

filter.

A) a-T,b-T,c-F,d-F

B) a-F,b-F,c-T,d-T

C) a-T,b-F,c-F,d-T

D )a-T,b-F,c-T,d-F


a) getty program i. Default value is $.

b) PS1 ii. The default value is >.

c) PS2 iii. Displays a login prompt

d) Shell variables iv. Always stored as characters





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Answer Keys

Part - A Part - B Part - C

Q. No. Ans. Key Q. No. Ans. Key Q. No. Ans. Key Q. No. Ans. Key

1 A 21 B 41 A 61 A

2 D 22 A 42 B 62 D

3 B 23 D 43 B 63 C

4 A 24 C 44 A 64 B

5 A 25 C 45 B 65 B

6 B 26 B 46 C 66 C

7 B 27 C 47 A 67 A

8 D 28 D 48 C 68 B

9 B 29 A 49 B 69 B

10 C 30 C 50 A 70 D

11 A 31 B 51 B 71 D

12 B 32 C 52 B 72 C

13 A 33 B 53 B 73 D

14 B 34 C 54 B 74 D

15 B 35 B 55 B 75 C

16 A 36 A 56 C

17 A 37 A 57 C

18 B 38 C 58 A

19 C 39 C 59 D

20 A 40 C 60 D

MC0070-Operating Systems with Unix Model Question Paper

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