1. What is an internal command in Unix ? commands that are executed directly by shell and kernel commands that are executed directly by the kernel commands that are executred directly by the shell commands will have a process id running for it 2. The game program,"space travel"for GECOS system was written in cobol basic vb fortran 3. How many line are there are in the result of date command one five three two 4. what is the relationship of a filename to its inode many to one many to many one to one one to many 5. what is the use of exec command command that can be used to write files in shell scripts command that can be used to read files in shell scripts command that can be used to open files in shell scripts all of the options 6. Buffering mechanisms regulated the data between secondary storage device and memory kernel and secondary storage device system call interface and device driver buffer cache and file system 7. What does OSS stand for original system server original source software open system software open source software 8. What does command LS do shows a calender display contents of a file opening a file display of file & folders, present in the folder where you are 9. A thread is a ____ process light weight interface heavy weight inter thread 10. Which is the carrect command to list files & folders in unix ls list files list dir 11. Which of the following is used to write disk block images from memory to disk cmd clri stty sync 12. A RAID system is useful because -- it increases interface performance it increases speed of the processor increase processor speed increases disk storage capacity 13. Programs like shell and editors (ed and vi) interact with the kernal by invoking interfacing hardware systems hardware system calls n/w program 14. Unix os was first rewritten in C in 1971 1972 1974 1973 15. The text formatting program traff expects to find new line character at the end of each line of text expects to find each line of text expects to neglect each line of text expects to find last character at the end of each line of text 16. Among the directory entries inode and file contents which will be changed when a file is updated only inode only directory entry and file contents only inode and file contents none of the options 17. Why is PWD used show present working directory to display error messages show current user to copy files 18. The system acctcom accounting program expects to find variable length records expects to sort the records expects to merge the records expects to find fixed length record 19. Internal or external command is checked using type tty etc ls 20. NFS stands for network format system normal file system network file system normal format system 21. is used to stop a process overt kill clear remove 22. How many fields are there in /etc/passwd file 10 7 8 3 23. Which of the following sections of an executable binary file has all un initialized data items symbol table data bss header 24. grep means global revearse expression print global random expression print global regular expression print global relative expression rpint 25. How can you display a list of files including hidden files ls-b all answers a,b,c ls-a find all 26. The Hardware at centre of UNIX system provides operating system with basic services kernel service basic services none of the options 27. Unix system treats devices as a file byte shardware none of the option 28. Operating System is also called as kernel lsystem kernel both system kernel and kerne none of the options 29. Non leaf node of the file system structure is path name leaf node of file regular file directory of file 30. Permission mode on newly created file will be 0798(hex) 0666(octal) 0666(hexadecimal) 0999(octal) 31. Full path name starts with dot double slash slash none of the options 32. Permission mode 0666(octal) means allowing all users acess to file for reading allowing all users access to file for reading writing allowing all users acess to file for writing restrict to read and write 33. Which of the following commands is used to rename a file? rename ren mv remove 34. Text formatting program troff find __character at the end of each line newline slash dot none of the options 35. Which command is used to display a file contents in octal form? od oct cd of 36. System accounting program acctcom find variable length record fixed length record no record none of the options 37. Which command is used to display the device name of the terminal you are using? who tty stty ls 38. Which of the following is not a communication command? mail write mesg grep 39. Directories are regular files fixed files variable files none of the options 40. Which command is used to remove a directory? rd dldir rdir rmdir 41. Program such as Shell and editors interact with kernel by invoking process system calls thread none of the options 42. Which of the following file names can be found in more than one directory? date bin passwd none of the options 43. Which command allows you to view your file 24 lines at a time ? more pg cat none of the options 44. The command that can be used to restrict incoming messages to a user is sleep halt grep mesg 45. The tail command in UNIX can be used to display the list of last 15 in the current directory can be used to look at the tail or bottom of the file can be used to display the list of last 10 files in the current directory none of the options 46. responsible for exchanging data between kernel and programs thread system calls process none of the options 47. The open and create system calls returns an integer called a file discriptor file variable file number none of the options 48. what is a.out ? system user program local program private user program none of the options 49. The sort command in UNIX used to sort a file both used to sort a file and used to sort the list of files in a directory used to sort the list of files in a directory none of the options 50. 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