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This set of Operating System Architecture Multiple Choice Questions & Answers (MCQs) focuses on Operating System Architecture Set 11
Q1 | If one exports a variable
- variables placed in the environment by a child process are not inherited by the parent process
- it is passed to all its descendant processes
- it dies when the shell that created it dies
- all of these
Q2 | Profilers are
- tools that analyze the run time behaviour of a program
- tools that check a c code for cross file consistency
- tools that keep track of evolving versions of a file
- none of the above
Q3 | The shell command :
- does nothing
- can be used to cause infinite looping
- can take arguments but it cannot act on them
- all of these
Q4 | Which of the following tools can be used to keep track of evolving versions of a file
- make
- yacc
- sccs
- dv
Q5 | The .(dot) shell command
- can take command line argument
- will fork a child shell to execute the named shell script
- can be used to change the environment of the current shell
- all of the above
Q6 | m4
- is a macro processor
- can he used to preprocess c code
- can be used to preprocess assembly language program
- none of the above
Q7 | If 7 terminals are currently logged on. then the commanddate ; who | wc -l, displays
- date followed by 7
- date followed by 8
- date followed by 1
- an error message
Q8 | Choose the correct answers if the command ls -l /dev/mt0 display'sbrw_rw_ _ _ _ 1 root 3, 0 Apr18 1:05 mt0
- the \b\ indicates that it is a special file
- mt0 indicates that it is a tape drive
- the \ b\ indicates that data transfer is done in blocks
- all of these
Q9 | cat/dev/tty
- throws garbage onto the terminal 1
- just echoes what you type. line by line
- terminates if one types control at the beginning of a line
- both (b) & ©
Q10 | The header files used in C programs arc usually found in
- /bin/include
- usr/bin/include
- /dev/ include
- iusr/include
Q11 | A C program should be compiled with -g option (like cc -g x . c) to use
- proof
- make
- lprof
- sdb
Q12 | The difference between a pipe and a regular file is that
- unlike a regular file, pipe is not a file.
- the data in a pipe is transient. unlike the contents of a regular file
- pipes forbid random accessing. while regular files do allow this
- both (b) and ©
Q13 | Context switch changes the process mode from………
- user to kernel mode
- kernel to user mode
- kernel mode to the kernel process
- both (a) and (b)
Q14 | cc command sequentially invokes
- preprocessor. compiler and link editor
- compiler and link editor
- preprocessor, compiler. assembler and link editor
- compiler, assembler and link editor
Q15 | The cc command
- can take more than one argument
- can act on files with . or . o extension
- creates . o files by default when more than one argument with .,- extension is present
- if provided with more than one argument. immediately terminates it the first argument fails to compile successfully
Q16 | The mv command changes
- only the directory entry
- only the directory entry and i-node
- only the i-node number
- none of the above
Q17 | Which of the following programs are not interactive?
- passwd
- date
- grep
- both (b) & ©
Q18 | Choose the correct statements.
- any process has an associated owner id and group id
- effective id defines who you are for the duration of a process
- real id defines who you are for the duration of a process
- both (a) & (b)
Q19 | No shell script can take input from
- stdin
- the output of the previously executed command redirected to it
- the shell holds the script
- none of the above
Q20 | The disadvantage of a pipe is that
- it is a one way communication channel
- it dies along with the process that created it
- it can\t he shared by unrelated processes
- all of these
Q21 | The state of signals are
- preserved across a fork call
- not preserved across an exec call
- preserved across an exec call
- both (a) & (b)
Q22 | Which of the following displays the exit status of the last executed command?
- echo $4
- echo $$
- echo $?
- echo $!
Q23 | Which of the following file names cannot be displayed if la ls* is run?
- .x
- ?x
- both (a) & (b)
- hidden
Q24 | Which of the following initiates the sequence of events that ultimately allows a user to login?
- clri
- sync
- login
- init
Q25 | What is ‘ps’ command for?
- prints the status
- prints the process status
- prints the execution status
- none