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620+ Operating System Architecture Solved MCQs

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Computer Science Engineering (CSE) .

1.

What is an internal command in Unix ?

A. commands that are executed directly by the kernel
B. commands that are executred directly by the shell
C. commands that are executed directly by shell and kernel
D. commands will have a process id running for it
Answer» B. commands that are executred directly by the shell
2.

What is major device number ?

A. it is an index to the kernel table that contains the address of all device driver functions known to the system
B. it is an index to theuser process table that contains the address of all device driver functions known to the system
C. it is an index to the kernel table that contains the address of all files
D. it is an index to the kernel table that contains the address of all directories
Answer» A. it is an index to the kernel table that contains the address of all device driver functions known to the system
3.

The game program,"space travel"for GECOS system was written in

A. basic
B. cobol
C. fortran
D. vb
Answer» C. fortran
4.

What does OSS stand for

A. open system software
B. original source software
C. open source software
D. original system server
Answer» C. open source software
5.

Which of the following is used to write disk block images from memory to disk

A. stty
B. cmd
C. sync
D. clri
Answer» C. sync
6.

How many line are there are in the result of date command

A. three
B. one
C. two
D. five
Answer» B. one
7.

While providing a text processing system for the patent department at bell labs,the unix system was moved to in 1971

A. pdp-6
B. pdp-7
C. pdp-9
D. pdp-11
Answer» D. pdp-11
8.

What is minor device number           

A. it tells the device driver function what actual physical device it is talking
B. it tells the device driver functionwhat actual physiacl device it is talking to and i/0 buffernig scheme to be used for reading
C. it tells the device driver functionwhat actual physical device it is talking to and i/0 buffernig scheme to be used for writing
D. it tells the device driver functionwhat actual physiacl device it is talking to and i/0 buffernig scheme to be used for data transfer
Answer» D. it tells the device driver functionwhat actual physiacl device it is talking to and i/0 buffernig scheme to be used for data transfer
9.

What is directory hierarchy ?

A. it is an organizational structure in which directories can contain files and other sub directories
B. it is an organizational structure in which directories can contain only files
C. it is an organizational structure in which directories can contain only sub directories
D. it is an organizational structure in which directory contains only one level
Answer» A. it is an organizational structure in which directories can contain files and other sub directories
10.

what is the relationship of a filename to its inode

A. one to one
B. one to many
C. many to one
D. many to many
Answer» C. many to one
11.

Unix os was first rewritten in C in

A. 1971
B. 1972
C. 1973
D. 1974
Answer» C. 1973
12.

Among the directory entries inode and file contents which will be changed when a file is updated

A. only inode
B. only inode and file contents
C. only directory entry and file contents
D. none of the above
Answer» B. only inode and file contents
13.

what is the use of exec command

A. command that can be used to write files in shell scripts
B. command that can be used to read files in shell scripts
C. command that can be used to open files in shell scripts
D. all of the above
Answer» C. command that can be used to open files in shell scripts
14.

Which of the following sections of an executable binary file has all un initialized data items

A. bss
B. data
C. header
D. symbol table
Answer» A. bss
15.

The previous system administartor has put useless messages at login . What file do you edit to change the system message

A. /etc/motd
B. /etc/str
C. /etc/strtms
D. /etc/.conf
Answer» A. /etc/motd
16.

Suppose that a process is in BLOCKED state waiting for some i/o service. When a service is completed, it goes to the

A. running state
B. ready state
C. suspended state
D. terminated state
Answer» B. ready state
17.

Buffering mechanisms regulated the data between

A. secondary storage device and memory
B. system call interface and device driver
C. kernel and secondary storage device
D. buffer cache and file system
Answer» D. buffer cache and file system
18.

A thread is a ---- process

A. light weight
B. interface
C. heavy weight
D. inter thread
Answer» A. light weight
19.

A RAID system is useful because --

A. it increases interface performance
B. it increases speed of the processor
C. increases disk storage capacity
D. increase processor speed
Answer» C. increases disk storage capacity
20.

NFS stands for

A. normal file system
B. network file system
C. network format system
D. normal format system
Answer» B. network file system
21.

How many fields are there in /etc/passwd file

A. 3
B. 7
C. 10
D. 8
Answer» B. 7
22.

Thomson and Ritchie published a paper describing unix system in

A. ieee xsactions on computers
B. international jouranal of computer
C. communicatio-ns of the acm
D. internal " "os
Answer» C. communicatio-ns of the acm
23.

Command to reboot the system

A. shutdown -k now
B. shutdown -l now
C. shutdown -r now
D. shutdown -s now
Answer» C. shutdown -r now
24.

grep means

A. global regular expression print
B. global revearse expression print
C. global random expression print
D. global relative expression rpint
Answer» A. global regular expression print
25.

A history file

A. contains list of files used during a session
B. contains list of directories used during a session
C. contains list of directories and sub directories used during a session
D. contains list of commands used during a session
Answer» D. contains list of commands used during a session
26.

Programs like shell and editors (ed and vi) interact with the kernal by invoking

A. system calls
B. systems hardware
C. n/w program
D. interfacing hardware
Answer» A. system calls
27.

Internal or external command is checked using

A. ls
B. tty
C. etc
D. type
Answer» D. type
28.

The standard name for executable files produced by c compiler is

A. b.out
B. c.out
C. a.out
D. d.out
Answer» C. a.out
29.

       script is run for successful login

A. /etc/profile
B. /etc/str
C. /etc/strtms
D. /etc/.conf
Answer» A. /etc/profile
30.

The root node in the file system is write as

A. /
B. \\
C. /..
D. ../
Answer» A. /
31.

       interacts with inner part of kernel

A. interface
B. shell
C. terminal
D. compiler
Answer» B. shell
32.

       is used to stop a process

A. kill
B. remove
C. clear
D. overt
Answer» A. kill
33.

directory attributes are displayed by

A. ls-l-a
B. ls-l-b
C. ls-l-c
D. ls-l-d
Answer» D. ls-l-d
34.

The x in the cat x command is

A. binary file
B. data file
C. text file
D. source file
Answer» A. binary file
35.

what is the run level for shut down and reboot respectively

A. 0 and 6
B. 1 and 6
C. 0 and 4
D. 1 and 4
Answer» A. 0 and 6
36.

The text formatting program traff

A. expects to find new line character at the end of each line of text
B. expects to find last character at the end of each line of text
C. expects to find each line of text
D. expects to neglect each line of text
Answer» A. expects to find new line character at the end of each line of text
37.

The system acctcom accounting program

A. expects to find variable length records
B. expects to find fixed length record
C. expects to sort the records
D. expects to merge the records
Answer» B. expects to find fixed length record
38.

permission to access the file is controlled by

A. n/w structure
B. directory structure
C. access permissions
D. file structure
Answer» C. access permissions
39.

To the user,the unix system treats devices as if they are

A. devices
B. interfaces
C. hardware
D. files
Answer» D. files
40.

Two invocations copy copy.c newcopy.c copy copy newcopy

A. 1st is carrect
B. 2nd is carrect
C. both carrect
D. both wrong
Answer» C. both carrect
41.

In processing environment of unix

A. a program is an executable file and process is an instance of the program in execution
B. a process is an executable file and program is a instance of the process in execution
C. a process and program are both same
D. all above are carrect
Answer» A. a program is an executable file and process is an instance of the program in execution
42.

The fork system call

A. creates a new program
B. creates a new interface
C. creates a new hardware
D. creates a new process
Answer» D. creates a new process
43.

What command do you have to use to go to parent directory

A. cd-,
B. cd -
C. cd/up
D. cd..
Answer» D. cd..
44.

The command used to display a specified file

A. mkdir
B. chmod
C. cat
D. compress
Answer» C. cat
45.

root in unix system is represented by

A. %
B. \\
C. $
D. /
Answer» D. /
46.

what does cd.. Do ?

A. not a valid unix command
B. logs out of the computer
C. changes the working directory to login directory
D. " " " " " " the parent of current working directory
Answer» D. " " " " " " the parent of current working directory
47.

What does command LS do

A. opening a file
B. display contents of a file
C. display of file & folders, present in the folder where you are
D. shows a calender
Answer» C. display of file & folders, present in the folder where you are
48.

Why is PWD used

A. show current user
B. show present working directory
C. to display error messages
D. to copy files
Answer» B. show present working directory
49.

Which is the carrect command to list files & folders in unix

A. list
B. ls
C. dir
D. list files
Answer» B. ls
50.

How can you display a list of files including hidden files

A. find all
B. ls-a
C. ls-b
D. all answers a,b,c
Answer» B. ls-a

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