MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 713 Mcqs, each offering curated multiple-choice questions to sharpen your Computer Science Engineering (CSE) knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The shell acts as an interface between the .. |
| A. | user and kernel |
| B. | user and operating system |
| C. | kernel and operating system |
| D. | none of these |
| Answer» B. user and operating system | |
| 2. |
A file x is created with the following contentsecho today is: dateIf you type x.then |
| A. | it echoes the message. followed by date. |
| B. | it gives the desired output only if the execute permission of file x is set. |
| C. | the desired output can be got by the command sh x. which works even if x has its execute permission not set. |
| D. | both (b) and |
| Answer» E. | |
| 3. |
Consider the program main ( ){printf("He arose a victor from n"); system ("date") ;printf("the dark domain");}If a.out is the executable code corresponding to the above source code, then the command a.out > out f |
| A. | redirects the output of date to file out f |
| B. | displays the output of date on the screen |
| C. | prints everything on the screen |
| D. | prints the two messages on the screen |
| Answer» B. displays the output of date on the screen | |
| 4. |
The following commands gives the output like this #cat file1 file2#cat: file1: No such file or directory helloIf we execute the command cat file1 file2 1>2 2>&1 the output would be |
| A. | cat: file1: no such file or directory hello |
| B. | no output is displayed |
| C. | cat: 1>2: no such file or directory |
| D. | hello |
| Answer» C. cat: 1>2: no such file or directory | |
| 5. |
Non leaf node of the file system structure is .. |
| A. | leaf node of file |
| B. | directory of file |
| C. | regular file |
| D. | path name |
| Answer» C. regular file | |
| 6. |
Given a code snippet below? #define PERMS (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)int main() { int fd1, fd2; umask(0);fd1 = open( file1 , O_CREAT | O_RDWR, PERMS)umask(S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);fd2 = open( file2 , O_CREAT | O_RDWR, PERMS)return 0;}The newly created files file1 and file2 will have the permissions respectively |
| A. | rw-rw-rw- r |
| B. | r rw-rw-rw- |
| C. | rw-rw-rw- rw |
| D. | none of the abov |
| Answer» D. none of the abov | |
| 7. |
For the below mentioned codeint main() { int fd;fd = open( logfile , O_CREAT|O_RDWR, 0600);lseek(fd, 5, SEEK_CUR);write(fd, Hello , 5);return 0;}, |
| A. | 5 |
| B. | 1024 |
| C. | 1029 |
| D. | 1034 |
| Answer» C. 1029 | |
| 8. |
What is stored in logfile as per below mentioned code if we execute ./a.out > logfile?nt main() {int fd; close(1);fd = open( logfile ,O_RDWR, 0744); write(fd, Hello , 5); printf( World n );return 0;} |
| A. | hello |
| B. | helloworld |
| C. | world |
| D. | none |
| Answer» C. world | |
| 9. |
Code snippet (file1 size is 2024)f1 = fopen (file1, RDWR, RWX)lseek(f1,1024,SEEK_SET) write(f1,buf,10)What is offset now. |
| A. | 1024 |
| B. | 1034 |
| C. | 2034 |
| D. | 2054 |
| Answer» C. 2034 | |
| 10. |
The statement z = expr 5 / 2 would store which of the following values in z? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 2.5 |
| Answer» D. 2.5 | |
| 11. |
The kernel itself is a program that usually lives in the root partition of the UNIX filesystem. Most Linux distributions call it and it often a symbolic link to the real kernel file which lives in /boot . |
| A. | /vmlinuz |
| B. | /kernel |
| C. | /root |
| D. | none |
| Answer» B. /kernel | |
| 12. |
What would be the current working directory at the end of the following command sequence? $ pwd/home/user1/proj$ cd src$ cd generic$ cd .$ pwd |
| A. | /home/user1/proj |
| B. | /home/user1/proj/sr c |
| C. | /home/user1 |
| D. | /home/user1/proj /src/generic |
| Answer» E. | |
| 13. |
The system start-up scripts are executed by when the system starts up and it is these scripts which are responsible for completing the bootstrap process of the UNIX system. |
| A. | init |
| B. | kernel |
| C. | root |
| D. | none |
| Answer» B. kernel | |
| 14. |
System accounting program acctcom find . |
| A. | variable length record |
| B. | fixed length record |
| C. | no record |
| D. | none of these |
| Answer» C. no record | |
| 15. |
The read system calls return 0 when .. |
| A. | it reaches middle of file |
| B. | it reaches end of the file |
| C. | file is empty |
| D. | none of these |
| Answer» C. file is empty | |
| 16. |
System treats the data in a directory as a .. |
| A. | byte stream |
| B. | bit stream |
| C. | stream |
| D. | none of these |
| Answer» B. bit stream | |
| 17. |
Text formatting program troff find . character at the end of each line |
| A. | newline |
| B. | slash |
| C. | dot |
| D. | none of these |
| Answer» B. slash | |
| 18. |
What is the output of the following program? [ -n $HOME ]echo $?[ -z $HOME ]echo $? |
| A. | 0 1 |
| B. | 1 0 |
| C. | 0 0 |
| D. | 1 1 |
| Answer» B. 1 0 | |
| 19. |
What is the output of the following program?b =[ -n $b ]echo $? [ -z $b ]echo $? |
| A. | 1 1 |
| B. | 2 2 |
| C. | 0 0 |
| D. | 0 1 |
| Answer» D. 0 1 | |
| 20. |
What is the output of the following program? x = 3; y = 5; z = 10;if [( $x -eq 3 ) -a ( $y -eq 5 -o $z -eq 10 )] thenecho $x elseecho $yfi |
| A. | 1 |
| B. | 3 |
| C. | 5 |
| D. | error |
| Answer» C. 5 | |
| 21. |
Which command is used to remove a file |
| A. | rename |
| B. | mv |
| C. | rm |
| D. | del |
| Answer» D. del | |
| 22. |
ode snippets str1= 45678 n str2= 123 n f1 = fopen(file1,RDWR,RWX) f2 = fopen(file1,RDWR,RWX) write(f1,str1,len_str1) write(f2,str2,len_str2)o/p: |
| A. | 12378 |
| B. | 123(newline)8(new line) |
| C. | 123(newline)78(ne wline) |
| D. | 45678(newline)1 23(newline) |
| Answer» C. 123(newline)78(ne wline) | |
| 23. |
Consider the following program main ( ){ printf ("Aayush won a football match on n"); system ("date");printf("In Berlin"); } if a.out is the executable code corresponding to the above source code,then the command a.out >out f |
| A. | redirects the output of date to a file out f |
| B. | displays the output of date on the screen |
| C. | prints everything on screen |
| D. | prints the two messages on the screen |
| Answer» B. displays the output of date on the screen | |
| 24. |
Below is the codeint main() { int fd1, fd2;struct stat buff1, buff2;fd1 = open( 1.txt , O_RDWR); fd2 = open( 2.txt , O_RDWR | O_APPEND);lseek(fd1, 10000, SEEK_SET);write(fd1, abcdefghij , 10);write(fd2, abcdefghij , 10); fstat(fd1, &buff1);fstat(fd2, &buff2);printf( %d %d , buff1.st_size, buff2.st_size);return 0;}Before running the program, the file 1.txt and 2.txt size is 20 each.What is the output? |
| A. | 30 30 |
| B. | 100020 20 |
| C. | 100030 30 |
| D. | 100010 30 |
| Answer» E. | |
| 25. |
The read system calls return 0 when……….. |
| A. | it reaches middle of file |
| B. | it reaches end of the file |
| C. | file is empty |
| D. | none of these |
| Answer» C. file is empty | |
| 26. |
here are two hard links to the “file1″ say hl and h2 and a softlink sl. What happens if we deleted the “file1″? |
| A. | we will still be able to access the file with hl and h2 but not with sl |
| B. | we will not be able to access the file with hl and h2 but with sl |
| C. | we will be able to access the file with any of hl, h2 and sl |
| D. | we will not be able to access the file with any of hl, h2 and sl |
| Answer» B. we will not be able to access the file with hl and h2 but with sl | |
| 27. |
The internal representation of a file is given by …….. |
| A. | an inode |
| B. | semaphore |
| C. | pipes |
| D. | none |
| Answer» B. semaphore | |
| 28. |
Given a code snippet below? #define PERMS (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)int main() { int fd1, fd2; umask(0);fd1 = open(“file1”, O_CREAT | O_RDWR, PERMS)umask(S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);fd2 = open(“file2”, O_CREAT | O_RDWR, PERMS)return 0;}The newly created files file1 and file2 will have the permissions respectively |
| A. | rw-rw-rw- r——– |
| B. | r——– rw-rw-rw- |
| C. | rw-rw-rw- rw—— |
| D. | none of the abov |
| Answer» D. none of the abov | |
| 29. |
Styles of system start-up scripts… |
| A. | the system v style |
| B. | the bsd style |
| C. | both a and b |
| D. | none |
| Answer» D. none | |
| 30. |
A pipe a mechanism that allow a stream of data between to be passed between…….. |
| A. | reader and writer process |
| B. | reader process |
| C. | writer process |
| D. | none of these |
| Answer» B. reader process | |
| 31. |
f a file is removed in Unix using ‘rm’ then |
| A. | the file can be recovered by a normal user |
| B. | the file cannot be recovered by a user |
| C. | the file can be fully recovered provided the sytem is not rebooted |
| D. | he file will be moved to/lost+found directory and can be recovered only by administrator’s intervention |
| Answer» C. the file can be fully recovered provided the sytem is not rebooted | |
| 32. |
If 7 terminals are currently logged on. then the commanddate ; who | wc -l, displays |
| A. | date followed by 7 |
| B. | date followed by 8 |
| C. | date followed by 1 |
| D. | an error message |
| Answer» B. date followed by 8 | |
| 33. |
You want to have the process/etc/myprocess run when the system enters run level 3. Which of the following inittab entries would accomplish this ? |
| A. | 5:3.once:/etc/myproces s |
| B. | 3:4:once:/etc/mypr ocess |
| C. | once:3:4:/etc/myp rocess |
| D. | once:5:3:/etc/my process |
| Answer» B. 3:4:once:/etc/mypr ocess | |
| 34. |
Which command is used to remove a file…… |
| A. | rename |
| B. | mv |
| C. | rm |
| D. | del |
| Answer» D. del | |
| 35. |
The sort command in UNIX …. |
| A. | used to sort a file |
| B. | used to sort the list of files in a directory |
| C. | both a and b |
| D. | none of the above |
| Answer» B. used to sort the list of files in a directory | |
| 36. |
All start-up scripts are typically kept in a directory named which usually lives somewhere under “/etc” |
| A. | init.d |
| B. | init.c |
| C. | intit.e |
| D. | none |
| Answer» B. init.c | |
| 37. |
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» E. | |
| 38. |
You want to install lilo. Which of the following would you do to accomplish this? |
| A. | lilo -u |
| B. | remove lilo |
| C. | uninstall lilo |
| D. | lilo -r |
| Answer» B. remove lilo | |
| 39. |
A file x is created with the following contentsecho today is: dateIf you type x.then |
| A. | it echoes the message. followed by date. |
| B. | it gives the desired output only if the execute permission of file x is set. |
| C. | the desired output can be got by the command sh x. which works even if x has its execute permission not set. |
| D. | both (b) and © |
| Answer» E. | |
| 40. |
The command that can be used to restrict incoming messages to a user is……….. |
| A. | mesg |
| B. | halt |
| C. | grep |
| D. | sleep |
| Answer» B. halt | |
| 41. |
What is stored in logfile as per below mentioned code if we execute ./a.out > logfile?nt main() {int fd; close(1);fd = open(“logfile”,O_RDWR, 0744); write(fd, “Hello”, 5); printf(“World\n”);return 0;} |
| A. | hello |
| B. | helloworld |
| C. | world |
| D. | none |
| Answer» C. world | |
| 42. |
Text formatting program troff find…………. character at the end of each line |
| A. | newline |
| B. | slash |
| C. | dot |
| D. | none of these |
| Answer» B. slash | |
| 43. |
Full path name starts with ….. |
| A. | dot |
| B. | slash |
| C. | double slash |
| D. | non of these |
| Answer» C. double slash | |
| 44. |
Two policies for managing memory are…………… |
| A. | swaping and demand paging |
| B. | semaphore and deadlock |
| C. | scheduling and wait |
| D. | none |
| Answer» B. semaphore and deadlock | |
| 45. |
What is the output of the following code: s=Unixecho 1.$os 2."$os" 3.'$os' 4.$os |
| A. | 1.unix 2.unix 3.unix 4.unix |
| B. | 1.unix 2.unix 3.$os 4.unix |
| C. | 1.unix 2.unix 3.unix 4.$os |
| D. | 1.unix 2.$os 3.$os 4.$os |
| Answer» C. 1.unix 2.unix 3.unix 4.$os | |
| 46. |
The new process called, child process gets a ………... return value from fork. |
| A. | -1 |
| B. | 0 |
| C. | 2 |
| D. | 1 |
| Answer» C. 2 | |
| 47. |
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» B. control the size of memory allocated to a process | |
| 48. |
By default, GRUB reads its default boot configuration from……… |
| A. | /boot/grub/menu.lst |
| B. | /boot/grub/splash.x pm.gz |
| C. | /boot |
| D. | grub.config |
| Answer» B. /boot/grub/splash.x pm.gz | |
| 49. |
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» D. dedicated mode | |
| 50. |
What is ‘ps’ command for? |
| A. | prints the status |
| B. | prints the process status |
| C. | prints the execution status |
| D. | none |
| Answer» C. prints the execution status | |