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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.
| 451. |
Which of the following displays the exit status of the last executed command? |
| A. | echo $4 |
| B. | echo $$ |
| C. | echo $? |
| D. | echo $! |
| Answer» D. echo $! | |
| 452. |
Which of the following programs are not interactive? |
| A. | passwd |
| B. | date |
| C. | grep |
| D. | both (b) & © |
| Answer» B. date | |
| 453. |
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» B. only the directory entry and i-node | |
| 454. |
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» D. if provided with more than one argument. immediately terminates it the first argument fails to compile successfully | |
| 455. |
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» D. compiler, assembler and link editor | |
| 456. |
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» E. | |
| 457. |
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» E. | |
| 458. |
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. | |
| 459. |
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» E. | |
| 460. |
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» E. | |
| 461. |
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» E. | |
| 462. |
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» B. date followed by 8 | |
| 463. |
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» D. all of the above | |
| 464. |
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» D. none of the above | |
| 465. |
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» D. dv | |
| 466. |
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» E. | |
| 467. |
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» B. tools that check a c code for cross file consistency | |
| 468. |
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» E. | |
| 469. |
Which of the following are character special files |
| A. | terminal |
| B. | printer |
| C. | modem |
| D. | all of these |
| Answer» E. | |
| 470. |
Environment variables can be accessed by |
| A. | system programs |
| B. | c programs |
| C. | shell scripts |
| D. | all of these |
| Answer» E. | |
| 471. |
lint should be used |
| A. | before compilation |
| B. | to analyze a c code |
| C. | after compilation |
| D. | both (a) and (b) |
| Answer» E. | |
| 472. |
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» B. * | |
| 473. |
The system identifies a file by its |
| A. | name |
| B. | absolute path |
| C. | both (a) and (b) |
| D. | mode number |
| Answer» E. | |
| 474. |
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» B. is acceptable if the double quotes are replaced by single quotes | |
| 475. |
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» E. | |
| 476. |
Redirection in pipes can be achieved by using |
| A. | > |
| B. | >> |
| C. | tee |
| D. | lpr |
| Answer» D. lpr | |
| 477. |
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» C. i-node number | |
| 478. |
Which of the following are not filter programs? |
| A. | date |
| B. | sort |
| C. | cat |
| D. | grep |
| Answer» B. sort | |
| 479. |
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» E. | |
| 480. |
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» E. | |
| 481. |
/bin |
| A. | is a bucket for storing information |
| B. | has files in binary code |
| C. | is a directory |
| D. | both (b) and © |
| Answer» E. | |
| 482. |
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» E. | |
| 483. |
If cat x. prints garbage. then x is probably a |
| A. | data file |
| B. | binary file |
| C. | text file |
| D. | source file |
| Answer» C. text file | |
| 484. |
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» E. | |
| 485. |
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» D. dedicated mode | |
| 486. |
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» E. | |
| 487. |
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» B. source file | |
| 488. |
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» E. | |
| 489. |
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» E. | |
| 490. |
A file x is created with the following contents echo today is: date If 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. | |
| 491. |
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» D. none of the above | |
| 492. |
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» D. none of the above | |
| 493. |
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 | |
| 494. |
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» E. | |
| 495. |
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» E. | |
| 496. |
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» D. none of the above | |
| 497. |
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» E. | |
| 498. |
/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» E. | |
| 499. |
dev/null |
| A. | is a file |
| B. | has write permission for all |
| C. | is the unix built- in dustbin |
| D. | all of these |
| Answer» E. | |
| 500. |
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» E. | |