MCQOPTIONS
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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.
| 301. |
Whcich command is used for word count |
| A. | infile |
| B. | file |
| C. | wc |
| D. | cp |
| Answer» D. cp | |
| 302. |
The command for changing file owener is |
| A. | chown |
| B. | chgrp |
| C. | chmod |
| D. | cher |
| Answer» B. chgrp | |
| 303. |
Which command is used to determine a type of file |
| A. | infile |
| B. | file |
| C. | wc |
| D. | cp |
| Answer» C. wc | |
| 304. |
which command is used for displaying contents of a file |
| A. | mv |
| B. | cp |
| C. | rm |
| D. | cv |
| Answer» C. rm | |
| 305. |
which command is used for copying a file |
| A. | mv |
| B. | cp |
| C. | rm |
| D. | cv |
| Answer» D. cv | |
| 306. |
which command is used for renaming a file |
| A. | mv |
| B. | cp |
| C. | rm |
| D. | cv |
| Answer» B. cp | |
| 307. |
which option in used for deleting everything in current directory and below. |
| A. | rm-i |
| B. | rm-r |
| C. | rm-f |
| D. | rm-rf |
| Answer» E. | |
| 308. |
which option is used for forcing removal operation |
| A. | rm-i |
| B. | rm-r |
| C. | rm-f |
| D. | rm-rf |
| Answer» D. rm-rf | |
| 309. |
Which option makes the command to ask the user for confirmation before removing each file |
| A. | rm-i |
| B. | rm-r |
| C. | rm-f |
| D. | rm-rf |
| Answer» B. rm-r | |
| 310. |
which opttion deletes all files in the current directory and all its subdirectories |
| A. | rm-i |
| B. | rm-r |
| C. | rm-f |
| D. | rm-rf |
| Answer» C. rm-f | |
| 311. |
Which directory under the root contains the information on devices |
| A. | /usr/bin |
| B. | /dev |
| C. | /usr/peripherals/de v |
| D. | /etc/dev |
| Answer» C. /usr/peripherals/de v | |
| 312. |
For some file the access permissions are modified to 764. Which of the following interpretation is valid: |
| A. | every one can read, group can execute only and the owner can read and write. |
| B. | every one can read and write, but owner alone can execute. |
| C. | every one can read, group including owner can write, owner alone can execute |
| D. | none of these |
| Answer» D. none of these | |
| 313. |
The advantage of binary files over text file is |
| A. | it is compact |
| B. | it can be accessed faster. |
| C. | they are more reliable |
| D. | all of these |
| Answer» E. | |
| 314. |
UNIX uses ls to list files in a directory. The corresponding command in MS environment is |
| A. | lf |
| B. | listdir |
| C. | dir |
| D. | none of these |
| Answer» D. none of these | |
| 315. |
dev/nul |
| A. | it is a file |
| B. | has write operation for all |
| C. | built in dest bin |
| D. | all of these |
| Answer» E. | |
| 316. |
In a system 5 peole are currently using VI editor, then no. of currosonding rocesses will be |
| A. | 1 |
| B. | 5 |
| C. | 2 |
| Answer» C. 2 | |
| 317. |
which of following features of UNIX may be used for IPC |
| A. | signals |
| B. | ipes |
| C. | semaphores |
| D. | all of these |
| Answer» E. | |
| 318. |
Short lived files created during execution are stored in |
| A. | /tmp |
| B. | /lib |
| C. | /bin |
| D. | /etc |
| Answer» B. /lib | |
| 319. |
various administrative fils such as password file in |
| A. | /dev |
| B. | /lib |
| C. | /bin |
| D. | /etc |
| Answer» E. | |
| 320. |
The basic program such as who and ed resids in |
| A. | /dev |
| B. | /lib |
| C. | /bin |
| D. | /etc |
| Answer» D. /etc | |
| 321. |
primary parts oc c comipler is in |
| A. | /dev |
| B. | /lib |
| C. | /bin |
| D. | /etc |
| Answer» C. /bin | |
| 322. |
The rm command removes |
| A. | directory entries |
| B. | removes inodes |
| C. | removes names |
| D. | removes files |
| Answer» B. removes inodes | |
| 323. |
The first tow bytes in each directory entry are |
| A. | connection between id and name |
| B. | connection between name of file and its contents |
| C. | connection between if and its contents |
| D. | connection betweeen id and contents |
| Answer» C. connection between if and its contents | |
| 324. |
The systems internal name to file is |
| A. | id |
| B. | i-number |
| C. | pid |
| D. | pid_t |
| Answer» C. pid | |
| 325. |
The administrative information of a file is stored in |
| A. | vnode |
| B. | dnode |
| C. | inode |
| D. | snode |
| Answer» D. snode | |
| 326. |
The command - in ls represents |
| A. | accessibility of a file |
| B. | permissin on the file |
| C. | reead |
| D. | execute |
| Answer» C. reead | |
| 327. |
The -t option to ls is used for |
| A. | sort according to time |
| B. | sor according to date |
| C. | sort according to name |
| D. | sort according to size |
| Answer» B. sor according to date | |
| 328. |
the different pemissions asociated with files are |
| A. | read |
| B. | write |
| C. | execute |
| D. | all ofthese |
| Answer» E. | |
| 329. |
user on unix system is alled as |
| A. | unique user |
| B. | super user |
| C. | special user |
| D. | all of these |
| Answer» C. special user | |
| 330. |
The parent directory is known as |
| A. | root |
| B. | bin |
| C. | user |
| D. | none of these |
| Answer» B. bin | |
| 331. |
what is file system |
| A. | seqenceof bytes |
| B. | sequence of bits |
| C. | sequence of kilo bytes |
| D. | sequence of megabytes |
| Answer» B. sequence of bits | |
| 332. |
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 | |
| 333. |
ode snippets str1=â€45678\n†str2=â€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) | |
| 334. |
Below is the codeint main() { int fd1, fd2; struct stat buff1, buff2; fd1 = open(“1.txtâ€, O_RDWR); fd2 = open(“2.txtâ€, O_RDWR | O_APPEND); lseek(fd1, 10000, SEEK_SET); write(fd1, “abcdefghijâ€, 10); write(fd2, “abcdefghijâ€, 10); fstat(fd1, &buff1); fstat(fd2, &buff2); printf(“ %d %dâ€, 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. | |
| 335. |
For the below mentioned codeint main() { int fd; fd = open(“logfileâ€, O_CREAT|O_RDWR, 0600); lseek(fd, 5, SEEK_CUR); write(fd, “Helloâ€, 5); return 0; }, |
| A. | 5 |
| B. | 1024 |
| C. | 1029 |
| D. | 1034 |
| Answer» C. 1029 | |
| 336. |
What is stored in logfile as per below mentioned code if we execute ./a.out > logfile?nt main() { int fd; close(1); fd = open(“logfileâ€,O_RDWR, 0744); write(fd, “Helloâ€, 5); printf(“World\nâ€); return 0; } |
| A. | hello |
| B. | helloworld |
| C. | world |
| D. | none |
| Answer» C. world | |
| 337. |
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(“file1â€, O_CREAT | O_RDWR, PERMS) umask(S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); fd2 = open(“file2â€, 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 | |
| 338. |
dup2(1,0) |
| A. | closes the stdout and copies the stdin descriptor to stdout |
| B. | closes the stdin and copies the stdout descriptor to stdin |
| C. | will produce compilation error |
| D. | none of the above |
| Answer» C. will produce compilation error | |
| 339. |
Which system call is used to create a hard link? |
| A. | hardlink |
| B. | link |
| C. | symlink |
| D. | ln |
| Answer» C. symlink | |
| 340. |
namei() is |
| A. | ansi c library function |
| B. | c library function |
| C. | system call |
| D. | kernel routine |
| Answer» E. | |
| 341. |
read() system call on success returns |
| A. | 0 |
| B. | -1 |
| C. | c) |
| D. | none |
| Answer» D. none | |
| 342. |
printf() uses which system call |
| A. | open |
| B. | read |
| C. | write |
| D. | close |
| Answer» D. close | |
| 343. |
Which function can be used instead of the dup2 to duplicate the file descriptor? |
| A. | read() |
| B. | open() |
| C. | stat() |
| D. | fcntl() |
| Answer» E. | |
| 344. |
What is the use of fcntl function? |
| A. | locking a file |
| B. | reading the file descriptor flag |
| C. | changing the file status flag |
| D. | all the above |
| Answer» E. | |
| 345. |
Switch table is used by |
| A. | device special file |
| B. | directory file |
| C. | fifo |
| D. | link file. |
| Answer» B. directory file | |
| 346. |
he file system information is stored in |
| A. | boot block |
| B. | super block |
| C. | inode table |
| D. | data block |
| Answer» C. inode table | |
| 347. |
What is the default number of files open per user process? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» E. | |
| 348. |
File descriptor table indexes which kernel structure? |
| A. | struct file |
| B. | strruct fs_struct |
| C. | files_struct |
| D. | struct inode |
| Answer» B. strruct fs_struct | |
| 349. |
Which command is used to mount file system read only. |
| A. | mount –a |
| B. | mount –v |
| C. | mount –f |
| D. | mount –r |
| Answer» E. | |
| 350. |
Each process has unique |
| A. | fd table |
| B. | file table |
| C. | inode table |
| D. | data block table |
| Answer» B. file table | |