McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Bachelor of Science in Computer Science FY (BSc CS) , Bachelor of Science in Computer Science SY (BSc CS) , Bachelor of Science in Computer Science (BSc CS) .
| 51. |
Which command changes a file’s group owner |
| A. | cgrp |
| B. | chgrp |
| C. | change |
| D. | group |
| Answer» B. chgrp | |
| 52. |
Which command is used to extract intermediate result in a pipeline |
| A. | tee |
| B. | extract |
| C. | exec |
| D. | none of the above |
| Answer» A. tee | |
| 53. |
Which command is used to extract a column from a text file |
| A. | paste |
| B. | get |
| C. | cut |
| D. | tar |
| Answer» C. cut | |
| 54. |
Which command is used to display disk consumption of a specific directory |
| A. | du |
| B. | ds |
| C. | dd |
| D. | dds |
| Answer» A. du | |
| 55. |
Which command is used to perform backup in unix? |
| A. | backup |
| B. | cpio |
| C. | zip |
| D. | gzip |
| Answer» B. cpio | |
| 56. |
Which command creates an empty file if file does not exist? |
| A. | cat |
| B. | touch |
| C. | ed |
| D. | read |
| Answer» B. touch | |
| 57. |
Which option of rm command is used to remove a directory with all its subdirectories |
| A. | –b |
| B. | –o |
| C. | –p |
| D. | –r |
| Answer» D. –r | |
| 58. |
Write the command to display the current date in the form dd/mm/yyyy. |
| A. | date +%d/%m/%y |
| B. | date +”%d/%m/%y” |
| C. | date +/%d/%m/20%y |
| D. | date +”/%d/%m/20%y” |
| Answer» A. date +%d/%m/%y | |
| 59. |
Which command will delete all the blank lines in file old.txt? |
| A. | sed ‘/d’ old.txt |
| B. | sed ‘/^/d’ old.txt |
| C. | sed ‘/^$/d’ old.txt |
| D. | sed ‘/^*/d’ old.txt |
| Answer» C. sed ‘/^$/d’ old.txt | |
| 60. |
The command “sed -n ‘/mcqmate/p’ old.txt” will |
| A. | print the lines containing the word ‘mcqmate’ in file old.txt |
| B. | delete the lines containing the word ‘mcqmate’ in file old.txt |
| C. | will generate an error message |
| D. | none of the mentioned |
| Answer» A. print the lines containing the word ‘mcqmate’ in file old.txt | |
| 61. |
Which option is used by sed to specify that the following string is an instruction or set of instructions? |
| A. | -n |
| B. | -e |
| C. | -f |
| D. | -i |
| Answer» A. -n | |
| 62. |
When we install a new package in linux system, then |
| A. | all the files of the packages are installed in a single directory |
| B. | different files are installed at different locations of the file system |
| C. | package works just after extraction, installation is not required |
| D. | none of the mentioned |
| Answer» B. different files are installed at different locations of the file system | |
| 63. |
Host specific configuration files are installed in |
| A. | /etc directory |
| B. | /lib directory |
| C. | /root directory |
| D. | /bin directory |
| Answer» A. /etc directory | |
| 64. |
The directory /media is the |
| A. | mount point for removable media |
| B. | mount point for filesystem |
| C. | both (a) and (b) |
| D. | none of the mentioned |
| Answer» A. mount point for removable media | |
| 65. |
What is /bin/sh ? |
| A. | bourne shell |
| B. | hard or symbolic link to the real shell command |
| C. | bash shell |
| D. | both (b) and (c) |
| Answer» B. hard or symbolic link to the real shell command | |
| 66. |
The /boot directory stores the data that is used |
| A. | before the kernel begins executing user mode programs |
| B. | after the kernel begins executing user mode programs |
| C. | before the bootloader is loaded in the ram |
| D. | none of the mentioned |
| Answer» A. before the kernel begins executing user mode programs | |
| 67. |
Which one of the directory does not contain binary files? |
| A. | /bin |
| B. | /sbin |
| C. | /etc |
| D. | none of the mentioned |
| Answer» C. /etc | |
| 68. |
Kernel modules are present in |
| A. | /lib directory |
| B. | /root directory |
| C. | /boot directory |
| D. | none of the mentioned |
| Answer» A. /lib directory | |
| 69. |
The directory /opt is reserved for |
| A. | installation of add-on application software packages |
| B. | optional booting files |
| C. | optional user specific files |
| D. | none of the mentioned |
| Answer» A. installation of add-on application software packages | |
| 70. |
The directory /srv contains |
| A. | site-specific data which is served by the system |
| B. | all the system files |
| C. | all the service files provided by the specific user |
| D. | none of the mentioned |
| Answer» A. site-specific data which is served by the system | |
| 71. |
Any file or directory present in the ______ directory may not be reserved between the invocation of the program. |
| A. | /var |
| B. | /tmp |
| C. | /etc |
| D. | all of the mentioned |
| Answer» B. /tmp | |
| 72. |
What is a context switch? |
| A. | kernel switches from executing one process to another. |
| B. | process switches from kernel mode to user mode. |
| C. | process switches from user mode to kernel mode. |
| D. | none of the above |
| Answer» A. kernel switches from executing one process to another. | |
| 73. |
Pid of init process |
| A. | 0 |
| B. | 1 |
| C. | 32767 |
| D. | none of the above |
| Answer» B. 1 | |
| 74. |
What is the default maximum number of processes that can exist in Linux? |
| A. | 32768 |
| B. | 1024 |
| C. | 4096 |
| D. | unlimited |
| Answer» A. 32768 | |
| 75. |
How do you get parent process identification number? |
| A. | waitpid |
| B. | getpid() |
| C. | getppid() |
| D. | parentid() |
| Answer» C. getppid() | |
| 76. |
The process which terminates before the parent process exits becomes |
| A. | zombie |
| B. | orphan |
| C. | child |
| D. | none of the above |
| Answer» A. zombie | |
| 77. |
Return value of fork() system call can be: |
| A. | -1,<0,0 |
| B. | -1,>0,0 |
| Answer» B. -1,>0,0 | |
| 78. |
If the fork() system call returns -1, then it means? |
| A. | no new child process is created |
| B. | the child process is an orphan |
| C. | the child process is in zombie |
| Answer» A. no new child process is created | |
| 79. |
Fork returns _____ to parent process on success |
| A. | 0 |
| B. | child process id |
| C. | parent process id |
| D. | none |
| Answer» B. child process id | |
| 80. |
Which niceness value among the following indicate most favorable scheduling? |
| A. | 0 |
| B. | 19 |
| C. | 5 |
| D. | -20 |
| Answer» D. -20 | |
| 81. |
The maximum time slice that can be given to a process in Linux (where tick is 10ms) is |
| A. | 150ms |
| B. | 10ms |
| C. | 300 ms |
| D. | 600ms |
| Answer» D. 600ms | |
| 82. |
Nice can be used by an ordinary process to |
| A. | increase the priority of a process |
| B. | decrease the priority of a process |
| C. | increase or decrease the priority of a process |
| Answer» B. decrease the priority of a process | |
| 83. |
Which one can be a real time schedule policy? |
| A. | sched_fifo |
| B. | sched_spf |
| C. | sched_other |
| D. | sched_filo |
| Answer» A. sched_fifo | |
| 84. |
Solaris real time class priority is |
| A. | 0-59 |
| B. | 60-99 |
| C. | 100-159 |
| D. | 160-169 |
| Answer» C. 100-159 | |
| 85. |
On x86-32 Linux, at which address the code segment of the program starts? |
| A. | 0x00000000 |
| B. | 0x08048000 |
| C. | 0x80000000 |
| D. | 0xbfff0000 |
| Answer» B. 0x08048000 | |
| 86. |
On x86-32 Linux, at which address the user stack resides normally? |
| A. | 0x00000000 |
| B. | 0x3fff0000 |
| C. | 0x7fff0000 |
| D. | 0xbfff0000 |
| Answer» D. 0xbfff0000 | |
| 87. |
A system has 512MB of physical memory. Which among the following is not a suitable virtual memory size for this system architecture? |
| A. | 512mb |
| B. | 256m |
| C. | 4gb |
| D. | none of the above |
| Answer» D. none of the above | |
| 88. |
LRU stands for |
| A. | last received unit |
| B. | least recently used |
| C. | least recently usable |
| D. | lost recoverd unit |
| Answer» B. least recently used | |
| 89. |
Mm_struct maintains? |
| A. | memory files |
| B. | open files |
| C. | pipe |
| D. | active memory regions |
| Answer» D. active memory regions | |
| 90. |
Is page table per process entity? |
| A. | yes |
| B. | no |
| Answer» A. yes | |
| 91. |
Among these files which has an ELF format |
| A. | shared objects |
| B. | core |
| C. | executables |
| D. | all of the above |
| Answer» D. all of the above | |
| 92. |
If one of the thread in multithreaded process is blocked on an I/O, which of the following is true? |
| A. | the entire process with block if their is no kernel supported threads |
| B. | other threads of the process will continue to execute even if there is no kernel supported threads |
| C. | it depends on specific implementatation |
| D. | all of the above |
| Answer» A. the entire process with block if their is no kernel supported threads | |
| 93. |
UNIX/Linux kernel is? |
| A. | monolithic |
| B. | micro |
| C. | exo |
| D. | nano |
| Answer» A. monolithic | |
| 94. |
Monolithic kernel |
| A. | is highly extensiblity |
| B. | has less run time overhead |
| C. | smaller than micro level |
| D. | suitable for real time system |
| Answer» B. has less run time overhead | |
| 95. |
Runlevel system command is used for? |
| A. | getting the present and previous runlevel of the system |
| B. | setting the runlevel attribute of the system in the inittab file |
| C. | can be used to restart or reboot the system |
| D. | all of the above |
| Answer» D. all of the above | |
| 96. |
Pick the run level to run Linux in multi user mode with networking? |
| A. | 0 |
| B. | 3 |
| C. | 5 |
| D. | 6 |
| Answer» B. 3 | |
| 97. |
Section 2 of manpage describes |
| A. | commands |
| B. | system calls |
| C. | function calls |
| D. | drivers |
| Answer» B. system calls | |
| 98. |
System call can be implemented using which assembly instruction(s) on x86 processors? |
| A. | int 0??80 |
| B. | sysenter |
| C. | both a & b |
| D. | none |
| Answer» C. both a & b | |
| 99. |
Which of the following exec call is a system call? |
| A. | execl |
| B. | execlp |
| C. | execve |
| D. | execvp |
| Answer» C. execve | |
| 100. |
______________ timer is decremented only when the process is executing |
| A. | itimer_real |
| B. | itimer_virtual |
| C. | itimer_prof |
| D. | none of the above |
| Answer» B. itimer_virtual | |
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