McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Computer Science Engineering (CSE) .
| 201. |
The first set of the three permissions (rw) pertains to the owner of the file, indicating that the owner has |
| A. | executable permission only |
| B. | write and executable permissions |
| C. | both read and executable permissions. |
| D. | both read and write permissions |
| Answer» D. both read and write permissions | |
| 202. |
Which of the following commands is used to save the output of the who command in a file named user.lst, as well as display it? |
| A. | who | tee user.lst |
| B. | who > user.lst |
| C. | who >> user.lst |
| D. | who < user.lste |
| Answer» A. who | tee user.lst | |
| 203. |
Which of the following shell's wildcards are used to match any number of characters including none? |
| A. | [ijk] |
| B. | [!ijk] |
| C. | ? |
| D. | * |
| Answer» D. * | |
| 204. |
Which symbol will be used with grep command to match the pattern pat at the end of a line? |
| A. | ^pat |
| B. | $pat |
| C. | pat$ |
| D. | pat^ |
| Answer» C. pat$ | |
| 205. |
Which command is used to display all the lines with the string 'sales' from the file empl.lst? |
| A. | cut sales empl.lst |
| B. | /sales > empl.lst |
| C. | grep sales empl.lst |
| D. | cat | /sales > empl.lst |
| Answer» C. grep sales empl.lst | |
| 206. |
Which of the following commands is note the vi Input mode command? |
| A. | rch |
| B. | r |
| C. | s |
| D. | j |
| Answer» D. j | |
| 207. |
Which of the following commands is used to remove files? |
| A. | erase |
| B. | delete |
| C. | rm |
| D. | dm |
| Answer» C. rm | |
| 208. |
Which command is used with vi editor to save file and remain in the editing mode? |
| A. | :q |
| B. | :w |
| C. | q! |
| D. | :x |
| Answer» B. :w | |
| 209. |
Which of the following commands is used to have a two-way communication with any person who is currently logged in? |
| A. | |
| B. | mesg |
| C. | write |
| D. | grep |
| Answer» C. write | |
| 210. |
Which command is used with vi editor to move the cursor to the left? |
| A. | i |
| B. | j |
| C. | k |
| D. | h |
| Answer» D. h | |
| 211. |
Which command is used to terminate all processes in your own system except the login shell? |
| A. | kill 1 |
| B. | kill 0 |
| C. | cancel all |
| D. | cancel 1 |
| Answer» B. kill 0 | |
| 212. |
Which command is used to link the files? |
| A. | ik |
| B. | in |
| C. | cp |
| D. | tar |
| Answer» B. in | |
| 213. |
Which of the following signs is used to back up over typing errors in vi? |
| A. | @ |
| B. | # |
| C. | $ |
| D. | ! |
| Answer» B. # | |
| 214. |
Which of are following internal commands is used in mail to forward mail to user in user-list? |
| A. | r user-list |
| B. | m user-list |
| C. | d user-list |
| D. | e user-list |
| Answer» B. m user-list | |
| 215. |
Which of the following commands is used to display the filenames in multiple columns? |
| A. | ls |
| B. | ls -1 |
| C. | ls -x |
| D. | lc |
| Answer» C. ls -x | |
| 216. |
Which of the following features of UNIX may be used for inter process communication? |
| A. | signals |
| B. | pipes |
| C. | semaphore |
| D. | all of these |
| Answer» D. all of these | |
| 217. |
The command echo welcome > /dev / tty |
| A. | echoes welcome in all the terminals that are switched on. |
| B. | echoes welcome in all the terminals that are logged on. |
| C. | echoes welcome only in the terminal in which it is run. |
| D. | both (a) and © |
| Answer» D. both (a) and © | |
| 218. |
dev/null |
| A. | is a file |
| B. | has write permission for all |
| C. | is the unix built- in dustbin |
| D. | all of these |
| Answer» D. all of these | |
| 219. |
The permission bits of a file noname. can be set to _rws_ _x_ _x by the command. |
| A. | chmod 711 noname |
| B. | chmod go -rw noname |
| C. | chmod 2711 noname |
| D. | none of the above |
| Answer» D. none of the above | |
| 220. |
/bin/passwd has the user execution permission set to 's' because |
| A. | this facility assigns to the user, permissions of the program owner. temporarily |
| B. | it should allow users who don\t have write permission to /etc/passwd to write to it |
| C. | /etc/passwd is write protected |
| D. | all of these |
| Answer» D. all of these | |
| 221. |
If one doesn't want anyone else to read or write to a file named datfile, except through a program in a file filex , then he may use |
| A. | chmod u+s filex ; chmod go_rw datfile |
| B. | chmod 4711 filex ; chmod go_rw datfile |
| C. | chmod 4711 datfile ; chmod go_rw filex |
| D. | both (a) and (b) |
| Answer» D. both (a) and (b) | |
| 222. |
Writing a C program that accepts input from keyboard, rather than from a file is advantageous because |
| A. | keyboard is a file that is already open |
| B. | it can be used in a pipe, if it writes to stdout |
| C. | both (a) and (b) |
| D. | none of the above |
| Answer» C. both (a) and (b) | |
| 223. |
Consider the following command that invokes the executable file a.out, with the following command line arguments a .out God loves you argv( [1][2] )corresponds to the character |
| A. | e |
| B. | o |
| C. | y |
| D. | d |
| Answer» D. d | |
| 224. |
Which of the following string functions can be used to find the last occurrence of a given character in a given string? |
| A. | strncmp |
| B. | strncpy |
| C. | strchr |
| D. | none of the above |
| Answer» D. none of the above | |
| 225. |
Consider the program main ( )
|
| 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» A. redirects the output of date to file out f | |
| 226. |
The default permission bits of a file when it is created for the first time, is controlled by |
| A. | chmod value |
| B. | fmask value |
| C. | umask value |
| D. | none of the above |
| Answer» C. umask value | |
| 227. |
Let x.c be a C source code. The command cc x.c > y |
| A. | is equivalent to the command cc x.c;mv a.out y |
| B. | is equivalent to the command cc -o y x.c |
| C. | serves no purpose |
| D. | none of the above |
| Answer» C. serves no purpose | |
| 228. |
A file x is created with the following contents
|
| 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» D. both (b) and © | |
| 229. |
Shell script is preferable to other forms of programming because it |
| A. | makes programming task easier |
| B. | enhances portability |
| C. | occupies less space |
| D. | all of these |
| Answer» D. all of these | |
| 230. |
Choose the incorrect statements. |
| A. | shell scripts can accept arguments |
| B. | shell scripts are interpreted |
| C. | shell is a programming language |
| D. | shell scripts are compiled |
| Answer» D. shell scripts are compiled | |
| 231. |
Files that store data in the same format as used in program are called |
| A. | binary files |
| B. | source file |
| C. | text file |
| D. | core |
| Answer» A. binary files | |
| 232. |
To allow only one user to work with a particular file at a particular time, one has to use |
| A. | semaphore |
| B. | critical region |
| C. | locking |
| D. | dedicated mode |
| Answer» C. locking | |
| 233. |
Which of the following remarks about realloc are true? |
| A. | it allocates memory of required size that need not be contiguous |
| B. | it may shift the existing block |
| C. | it can work only with an existing block of memory |
| D. | both (b) and © |
| Answer» D. both (b) and © | |
| 234. |
The differences between malloc( ) and calloc() are: |
| A. | malloc is used for dynamic allocation of memory, while cal:1c can't be used for that purpose |
| B. | malloc needs only one argument. while cal loc needs two. |
| C. | unlike malloc, calloc allocates memory and initializes it to 0. |
| D. | both (b) and © |
| Answer» D. both (b) and © | |
| 235. |
The file that stores an integer as a sequence of characters is a |
| A. | text file |
| B. | data file |
| C. | binary file |
| D. | core file |
| Answer» A. text file | |
| 236. |
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 | |
| 237. |
Which of the following file names can be found in more than one directoy? |
| A. | passwd |
| B. | bin |
| C. | date |
| D. | both (a) and (b) |
| Answer» D. both (a) and (b) | |
| 238. |
/bin |
| A. | is a bucket for storing information |
| B. | has files in binary code |
| C. | is a directory |
| D. | both (b) and © |
| Answer» D. both (b) and © | |
| 239. |
The main reasons for the success of pipes are |
| A. | the availability of many filter programs |
| B. | unix treats devices as files |
| C. | it provides a 2- way communication channel |
| D. | both (a) and (b) |
| Answer» D. both (a) and (b) | |
| 240. |
Which of the following are not filter programs? |
| A. | date |
| B. | sort |
| C. | cat |
| D. | grep |
| Answer» A. date | |
| 241. |
Redirection in pipes can be achieved by using |
| A. | > |
| B. | >> |
| C. | tee |
| D. | lpr |
| Answer» C. tee | |
| 242. |
Choose the correct statements. |
| A. | the symbols > and | are both processed by shell |
| B. | > can be used to direct output to a named file |
| C. | | can be used to direct output to programs |
| D. | all of above |
| Answer» D. all of above | |
| 243. |
The command who sort - file1 > file2 |
| A. | results in an error |
| B. | sorts the contents of file1 and puts it in file2 |
| C. | both (a) and (b) |
| D. | none of the above |
| Answer» D. none of the above | |
| 244. |
The system identifies a file by its |
| A. | name |
| B. | absolute path |
| C. | both (a) and (b) |
| D. | mode number |
| Answer» D. mode number | |
| 245. |
The system identifies the end of a file by the |
| A. | eof character |
| B. | file size |
| C. | i-node number |
| D. | both (a) and (b) |
| Answer» B. file size | |
| 246. |
The command line argument a.out x 'a b' "c d" |
| A. | is acceptable |
| B. | is acceptable if the double quotes are replaced by single quotes |
| C. | is acceptable if the single quotes arc replaced by double quotes |
| D. | none of the above |
| Answer» A. is acceptable | |
| 247. |
Which of the following metacharacters will be recognized by the shell. even if it comes within double quotes? |
| A. | $ |
| B. | * |
| C. | ? |
| D. | none of these |
| Answer» A. $ | |
| 248. |
lint should be used |
| A. | before compilation |
| B. | to analyze a c code |
| C. | after compilation |
| D. | both (a) and (b) |
| Answer» D. both (a) and (b) | |
| 249. |
Environment variables can be accessed by |
| A. | system programs |
| B. | c programs |
| C. | shell scripts |
| D. | all of these |
| Answer» D. all of these | |
| 250. |
Which of the following are character special files |
| A. | terminal |
| B. | printer |
| C. | modem |
| D. | all of these |
| Answer» D. all of these | |
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