McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Computer Science Engineering (CSE) .
| 251. |
If one exports a variable |
| A. | variables placed in the environment by a child process are not inherited by the parent process |
| B. | it is passed to all its descendant processes |
| C. | it dies when the shell that created it dies |
| D. | all of these |
| Answer» D. all of these | |
| 252. |
Profilers are |
| A. | tools that analyze the run time behaviour of a program |
| B. | tools that check a c code for cross file consistency |
| C. | tools that keep track of evolving versions of a file |
| D. | none of the above |
| Answer» A. tools that analyze the run time behaviour of a program | |
| 253. |
The shell command : |
| A. | does nothing |
| B. | can be used to cause infinite looping |
| C. | can take arguments but it cannot act on them |
| D. | all of these |
| Answer» D. all of these | |
| 254. |
Which of the following tools can be used to keep track of evolving versions of a file |
| A. | make |
| B. | yacc |
| C. | sccs |
| D. | dv |
| Answer» C. sccs | |
| 255. |
The .(dot) shell command |
| A. | can take command line argument |
| B. | will fork a child shell to execute the named shell script |
| C. | can be used to change the environment of the current shell |
| D. | all of the above |
| Answer» C. can be used to change the environment of the current shell | |
| 256. |
m4 |
| A. | is a macro processor |
| B. | can he used to preprocess c code |
| C. | can be used to preprocess assembly language program |
| D. | none of the above |
| Answer» C. can be used to preprocess assembly language program | |
| 257. |
If 7 terminals are currently logged on. then the command date ; who | wc -l, displays |
| A. | date followed by 7 |
| B. | date followed by 8 |
| C. | date followed by 1 |
| D. | an error message |
| Answer» A. date followed by 7 | |
| 258. |
Choose the correct answers if the command ls -l /dev/mt0 display's brw_rw_ _ _ _ 1 root 3, 0 Apr18 1:05 mt0 |
| A. | the \b\ indicates that it is a special file |
| B. | mt0 indicates that it is a tape drive |
| C. | the \ b\ indicates that data transfer is done in blocks |
| D. | all of these |
| Answer» D. all of these | |
| 259. |
cat/dev/tty |
| A. | throws garbage onto the terminal 1 |
| B. | just echoes what you type. line by line |
| C. | terminates if one types control at the beginning of a line |
| D. | both (b) & © |
| Answer» D. both (b) & © | |
| 260. |
The header files used in C programs arc usually found in |
| A. | /bin/include |
| B. | usr/bin/include |
| C. | /dev/ include |
| D. | iusr/include |
| Answer» D. iusr/include | |
| 261. |
A C program should be compiled with -g option (like cc -g x . c) to use |
| A. | proof |
| B. | make |
| C. | lprof |
| D. | sdb |
| Answer» D. sdb | |
| 262. |
The difference between a pipe and a regular file is that |
| A. | unlike a regular file, pipe is not a file. |
| B. | the data in a pipe is transient. unlike the contents of a regular file |
| C. | pipes forbid random accessing. while regular files do allow this |
| D. | both (b) and © |
| Answer» D. both (b) and © | |
| 263. |
Context switch changes the process mode from……… |
| A. | user to kernel mode |
| B. | kernel to user mode |
| C. | kernel mode to the kernel process |
| D. | both (a) and (b) |
| Answer» D. both (a) and (b) | |
| 264. |
cc command sequentially invokes |
| A. | preprocessor. compiler and link editor |
| B. | compiler and link editor |
| C. | preprocessor, compiler. assembler and link editor |
| D. | compiler, assembler and link editor |
| Answer» C. preprocessor, compiler. assembler and link editor | |
| 265. |
The cc command |
| A. | can take more than one argument |
| B. | can act on files with . or . o extension |
| C. | creates . o files by default when more than one argument with .,- extension is present |
| D. | if provided with more than one argument. immediately terminates it the first argument fails to compile successfully |
| Answer» C. creates . o files by default when more than one argument with .,- extension is present | |
| 266. |
The mv command changes |
| A. | only the directory entry |
| B. | only the directory entry and i-node |
| C. | only the i-node number |
| D. | none of the above |
| Answer» A. only the directory entry | |
| 267. |
Which of the following programs are not interactive? |
| A. | passwd |
| B. | date |
| C. | grep |
| D. | both (b) & © |
| Answer» A. passwd | |
| 268. |
Choose the correct statements. |
| A. | any process has an associated owner id and group id |
| B. | effective id defines who you are for the duration of a process |
| C. | real id defines who you are for the duration of a process |
| D. | both (a) & (b) |
| Answer» D. both (a) & (b) | |
| 269. |
No shell script can take input from |
| A. | stdin |
| B. | the output of the previously executed command redirected to it |
| C. | the shell holds the script |
| D. | none of the above |
| Answer» D. none of the above | |
| 270. |
The disadvantage of a pipe is that |
| A. | it is a one way communication channel |
| B. | it dies along with the process that created it |
| C. | it can\t he shared by unrelated processes |
| D. | all of these |
| Answer» D. all of these | |
| 271. |
The state of signals are |
| A. | preserved across a fork call |
| B. | not preserved across an exec call |
| C. | preserved across an exec call |
| D. | both (a) & (b) |
| Answer» D. both (a) & (b) | |
| 272. |
Which of the following displays the exit status of the last executed command? |
| A. | echo $4 |
| B. | echo $$ |
| C. | echo $? |
| D. | echo $! |
| Answer» C. echo $? | |
| 273. |
Which of the following file names cannot be displayed if la ls* is run? |
| A. | .x |
| B. | ?x |
| C. | both (a) & (b) |
| D. | hidden |
| Answer» C. both (a) & (b) | |
| 274. |
Which of the following initiates the sequence of events that ultimately allows a user to login? |
| A. | clri |
| B. | sync |
| C. | login |
| D. | init |
| Answer» D. init | |
| 275. |
What is ‘ps’ command for? |
| A. | prints the status |
| B. | prints the process status |
| C. | prints the execution status |
| D. | none |
| Answer» B. prints the process status | |
| 276. |
Which command is used to terminate the process? |
| A. | wait |
| B. | sleep |
| C. | kill |
| D. | none |
| Answer» C. kill | |
| 277. |
Which commaand is use for the copy in unix? |
| A. | copy |
| B. | cp |
| C. | cpy |
| D. | none |
| Answer» B. cp | |
| 278. |
What is stand for IPC? |
| A. | inter procedure communication |
| B. | inter process communication |
| C. | inter part compare |
| D. | none |
| Answer» B. inter process communication | |
| 279. |
Which one is best in action between fork() and vfork()? |
| A. | fork() |
| B. | vfork() |
| C. | both |
| D. | none |
| Answer» B. vfork() | |
| 280. |
fork system call….. |
| A. | control the size of memory allocated to a process |
| B. | create a new process |
| C. | overlay image of a program onto the running process |
| D. | finish executing a process |
| Answer» B. create a new process | |
| 281. |
exec system call…….. |
| A. | create a new process |
| B. | finish executing a process |
| C. | control the size of memory allocated to a process |
| D. | overlay image of a program onto the running process |
| Answer» D. overlay image of a program onto the running process | |
| 282. |
wait system call………… |
| A. | finish executing a process |
| B. | control the size of memory allocated to a process |
| C. | synchronize process execution with exit of previously forked process |
| D. | overlay image of a program onto the running process |
| Answer» C. synchronize process execution with exit of previously forked process | |
| 283. |
brk system call………… |
| A. | synchronize process execution with exit of previously forked process |
| B. | control the size of memory allocated to a process |
| C. | finish executing a process |
| D. | overlay image of a program onto the running process |
| Answer» B. control the size of memory allocated to a process | |
| 284. |
signal system call………… |
| A. | control process response to extraordinary events |
| B. | control the size of memory allocated to a process |
| C. | synchronize process execution with exit of previously forked process |
| D. | overlay image of a program onto the running process |
| Answer» A. control process response to extraordinary events | |
| 285. |
Two policies for managing memory are…………… |
| A. | swaping and demand paging |
| B. | semaphore and deadlock |
| C. | scheduling and wait |
| D. | none |
| Answer» A. swaping and demand paging | |
| 286. |
Schedular module allocate ….. |
| A. | processes to cpu |
| B. | cpu to processes |
| C. | processes to kernel |
| D. | none |
| Answer» B. cpu to processes | |
| 287. |
The file subsystem accesses file data using a buffering mechanism that regulates …. |
| A. | data flow between the kernel and secondary storage devices. |
| B. | data flow between secondary storage devices to kernel |
| C. | data flow of kernel |
| D. | none |
| Answer» A. data flow between the kernel and secondary storage devices. | |
| 288. |
The internal representation of a file is given by …….. |
| A. | an inode |
| B. | semaphore |
| C. | pipes |
| D. | none |
| Answer» A. an inode | |
| 289. |
Every file in unix has ….. |
| A. | two inode |
| B. | one inode |
| C. | no inode |
| D. | none |
| Answer» B. one inode | |
| 290. |
inode name is also called…… |
| A. | file |
| B. | link |
| C. | file |
| D. | file descriptors |
| Answer» B. link | |
| 291. |
When a process creates a new file, the kernel assigns it an ……... |
| A. | used inode |
| B. | unused inode |
| C. | integer number |
| D. | file number |
| Answer» B. unused inode | |
| 292. |
With inode, the kernel contains two data structures…………. |
| A. | file table and user file descriptor table |
| B. | file system and kernel |
| C. | file and semaphore |
| D. | none |
| Answer» A. file table and user file descriptor table | |
| 293. |
Which of the following is not A system calls? |
| A. | chmod |
| B. | open |
| C. | lseek |
| D. | getc |
| Answer» D. getc | |
| 294. |
Mounting a file system results in the loading of |
| A. | boot block |
| B. | super block |
| C. | i-node table |
| D. | all of these |
| Answer» B. super block | |
| 295. |
If cat x ,prints garbage ,then x is probably a |
| A. | data file |
| B. | binary file |
| C. | text file |
| D. | source file |
| Answer» B. binary file | |
| 296. |
An attempt to read from locked file,results in |
| A. | prematured termination |
| B. | a deadlock |
| C. | an indefinite wait |
| D. | none of the above |
| Answer» D. none of the above | |
| 297. |
To allow only one user to work with a particular file at a particular time ,one has to ….. |
| A. | semaphore |
| B. | critical region |
| C. | locking |
| D. | dedicated mode |
| Answer» C. locking | |
| 298. |
Which of the following are character special files? |
| A. | terminal |
| B. | printer |
| C. | modem |
| D. | tape drive |
| Answer» C. modem | |
| 299. |
Which of the following sections of an executable binary file has all uninitialized data items? |
| A. | bss |
| B. | data |
| C. | header |
| D. | symbol |
| Answer» A. bss | |
| 300. |
Which of the following files contains information related to password aging? |
| A. | shadow |
| B. | profile |
| C. | password |
| D. | all of these |
| Answer» C. password | |
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