Operating System Architecture Set 1 MCQs

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