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This set of Operating System Architecture Multiple Choice Questions & Answers (MCQs) focuses on Operating System Architecture Set 1
Q1 | What is an internal command in Unix ?
- commands that are executed directly by the kernel
- commands that are executred directly by the shell
- commands that are executed directly by shell and kernel
- commands will have a process id running for it
Q2 | What is major device number ?
- it is an index to the kernel table that contains the address of all device driver functions known to the system
- it is an index to theuser process table that contains the address of all device driver functions known to the system
- it is an index to the kernel table that contains the address of all files
- it is an index to the kernel table that contains the address of all directories
Q3 | The game program,"space travel"for GECOS system was written in
- basic
- cobol
- fortran
- vb
Q4 | What does OSS stand for
- open system software
- original source software
- open source software
- original system server
Q5 | Which of the following is used to write disk block images from memory to disk
- stty
- cmd
- sync
- clri
Q6 | How many line are there are in the result of date command
- three
- one
- two
- five
Q7 | While providing a text processing system for the patent department at bell labs,the unix system was moved to in 1971
- pdp-6
- pdp-7
- pdp-9
- pdp-11
Q8 | What is minor device number
- it tells the device driver function what actual physical device it is talking
- it tells the device driver functionwhat actual physiacl device it is talking to and i/0 buffernig scheme to be used for reading
- it tells the device driver functionwhat actual physical device it is talking to and i/0 buffernig scheme to be used for writing
- it tells the device driver functionwhat actual physiacl device it is talking to and i/0 buffernig scheme to be used for data transfer
Q9 | What is directory hierarchy ?
- it is an organizational structure in which directories can contain files and other sub directories
- it is an organizational structure in which directories can contain only files
- it is an organizational structure in which directories can contain only sub directories
- it is an organizational structure in which directory contains only one level
Q10 | what is the relationship of a filename to its inode
- one to one
- one to many
- many to one
- many to many
Q11 | Unix os was first rewritten in C in
- 1971
- 1972
- 1973
- 1974
Q12 | Among the directory entries inode and file contents which will be changed when a file is updated
- only inode
- only inode and file contents
- only directory entry and file contents
- none of the above
Q13 | what is the use of exec command
- command that can be used to write files in shell scripts
- command that can be used to read files in shell scripts
- command that can be used to open files in shell scripts
- all of the above
Q14 | Which of the following sections of an executable binary file has all un initialized data items
- bss
- data
- header
- symbol table
Q15 | The previous system administartor has put useless messages at login . What file do you edit to change the system message
- /etc/motd
- /etc/str
- /etc/strtms
- /etc/.conf
Q16 | Suppose that a process is in BLOCKED state waiting for some i/o service. When a service is completed, it goes to the
- running state
- ready state
- suspended state
- terminated state
Q17 | Buffering mechanisms regulated the data between
- secondary storage device and memory
- system call interface and device driver
- kernel and secondary storage device
- buffer cache and file system
Q18 | A thread is a ---- process
- light weight
- interface
- heavy weight
- inter thread
Q19 | A RAID system is useful because --
- it increases interface performance
- it increases speed of the processor
- increases disk storage capacity
- increase processor speed
Q20 | NFS stands for
- normal file system
- network file system
- network format system
- normal format system
Q21 | How many fields are there in /etc/passwd file
- 3
- 7
- 10
- 8
Q22 | Thomson and Ritchie published a paper describing unix system in
- ieee xsactions on computers
- international jouranal ofcomputer
- communicatio-ns of the acm
- internal " "os
Q23 | Command to reboot the system
- shutdown -k now
- shutdown -l now
- shutdown -r now
- shutdown -s now
Q24 | grep means
- global regular expression print
- global revearse expression print
- global random expression print
- global relative expression rpint
Q25 | A history file
- contains list of files used during a session
- contains list of directories used during a session
- contains list of directories and sub directories used during a session
- contains list of commands used during a session