Description : Which of the following information about the UNIX file system is not correct? (A) Super block contains the number of i-nodes, the number of disk blocks, and the start of the list of free disk blocks. (B ... Each i-node is 256-bytes long. (D) All the files and directories are stored in data blocks.
Last Answer : (C) Each i-node is 256-bytes long.
Description : In ............ allocation method for disk block allocation in a file system, insertion and deletion of blocks in a file is easy. (A) Index (B) Linked (C) Contiguous (D) Bit Map
Last Answer : (B) Linked
Description : The Unix Kernel maintains two key data structures related to processes, the process table and the user structure. Which of following information is not the part of user structure? (A) File descriptor table (B) System call state (C) Scheduling parameters (D) Kernel stack
Last Answer : (C) Scheduling parameters
Description : A unix file system has 1-KB blocks and 4-byte disk addresses. What is the maximum file size if i-nodes contain 10 direct entries and one single, double and triple indirect entry each? (A) 32 GB (B) 64 GB (C) 16 GB (D) 1 GB
Last Answer : (C) 16 GB
Description : Which of the following statements is not true about disk-arm scheduling algorithms ? (A) SSTF (shortest seek time first) algorithm increases performance of FCFS. (B) The number of requests for disk ... arm movements. (D) SCAN and C-SCAN algorithms are less likely to have a starvation problem.
Last Answer : (B) The number of requests for disk service are not influenced by file allocation method.
Description : A UNIX file system has 1 KB block size and 4-byte disk addresses. What is the maximum file size if the inode contains ten direct block entries, one single indirect block entry, one double indirect block entry and one triple indirect block entry? (A) 30 GB (B) 64 GB (C) 16 GB (D) 1 GB
Description : In Unix operating system, special files are used to : (A) buffer data received in its input from where a process reads (B) provide a mechanism to map physical device to file names (C ... pointers associated with i-nodes (D) store information entered by a user application program or utility program
Last Answer : (B) provide a mechanism to map physical device to file names
Description : Which of the following information not included in memory table? A) The allocation of main memory to process. B) The allocation of secondary memory to process C) Any information needed to manage virtual memory D) Any information about the existence of file
Last Answer : D) Any information about the existence of file
Description : In the indexed scheme of blocks to a file, the maximum possible size of the file depends on: (A) The number of blocks used for index, and the size of index (B) Size of Blocks and size of Address (C) Size of Index (D) Size of Block
Last Answer : (A) The number of blocks used for index, and the size of index
Description : The directory structure used in Unix file system is called (A) Hierarchical directory (B) Tree structured directory (C) Directed acyclic graph (D) Graph structured directory
Last Answer : (C) Directed acyclic graph
Description : A virtual memory has a page size of 1K words. There are eight pages and four blocks. The associative memory page table contains the following entries: Which of the following list of virtual addresses (in ... 1234, 4012, 5000, 6200 (C) 1020, 3012, 6120, 8100 (D) 2021, 4050, 5112, 7100
Last Answer : Answer: C Explanation: The pages which are not in main memory are: 1020 will not cause page fault (1024-2047) 3012 will not cause page fault (3072-4095) 6120 will not cause page fault (4096-5119) 8100 will not cause page fault (6144-7167)
Description : In ________, eachnode maintains avector (table)of minimum distances to every node. A) path vector B) distancevector C) link state D) none of the above
Last Answer : distancevector
Description : Consider the following UNIX command: sort temp; head -30
Last Answer : (C) Sort, taking the input from "in" and writing the output to "temp" then prints 30 lines from temp on terminal. Finally "temp" is removed.
Description : A unix file may be of type: (A) Regular file (B) Directory File (C) Device File (D) Any one of the above
Last Answer : (D) Any one of the above
Description : What will be the output of the following Unix command ? $rm chap0\[1 - 3\] (A) Remove file chap0[1 - 3] (B) Remove file chap01, chap02, chap03 (C) Remove file chap\[1 - 3\] (D) None of the above
Last Answer : (A) Remove file chap0[1 - 3]
Description : In Unix, the command to enable execution permission for file “mylife” by all is ................ (A) Chmod ugo+X myfile (B) Chmod a+X myfile (C) Chmod +X myfile (D) All of the above
Last Answer : (D) All of the above
Description : In Unix, the login prompt can be changed by changing the contents of the file ............... (A) contrab (B) init (C) gettydefs (D) inittab
Last Answer : Answer: C
Description : In Unix, files can be protected by assigning each one a 9-bit mode called rights bits. Now, consider the following two statements: I. A mode of 641 (octal) means that the owner can read and write the file, other ... (B) Only II is correct (C) Both I and II are correct (D) Both I and II are incorrect
Last Answer : (C) Both I and II are correct
Description : What is the function of following UNIX command? WC - lb& (A) It runs the word count program to count the number of lines in its input, a, writing the result to b, as a foreground process. (B) It runs ... (D) It copies the l ' numbers of lines of program from file, a, and stores in file b.
Last Answer : (B) It runs the word count program to count the number of lines in its input, a, writing the result to b, but does it in the background.
Description : Unix command to change the case of first three lines of file “shortlist” from lower to upper (1) $ tr ‘[a-z]’ ‘[A-Z]’ shortlist | head-3 (2) $ head-3 shortlist | tr ‘[a-z]’ ‘[A-Z]’ (3) $ tr head-3 shortlist ‘[A-Z]’ ‘[a-z]’ (4) $ tr shortlist head-3 ‘[a-z]’ ‘[A-Z]’
Last Answer : (2) $ head-3 shortlist | tr ‘[a-z]’ ‘[A-Z]’
Description : If the Disk head is located initially at track 32, find the number of disk moves required with FCFS scheduling criteria if the disk queue of I/O blocks requests are: 98, 37, 14, 124, 65, 67 (A) 320 (B) 322 (C) 321 (D) 319
Last Answer : (C) 321
Description : Which of the following statement is not correct with reference to cron daemon in UNIX O.S? (A) The cron daemon is the standard tool for running commands on a predetermined schedule. (B) It starts ... command lines and the times at which they invoked. (D) Crontab for individual users are not stored.
Last Answer : (D) Crontab for individual users are not stored.
Description : The order of a leaf node in a B+ tree is the maximum number of children it can have. Suppose that block size is 1 kilobytes, the child pointer takes 7 bytes long and search field value takes 14 bytes long. The order of the leaf node is ............ (1) 16 (2) 63 (3) 64 (4) 65
Last Answer : Answer: All
Description : A thread is usually defined as a light weight process because an Operating System (OS) maintains smaller data structure for a thread than for a process. In relation to this, which of the following ... separate stack for each thread. (D) OS does not maintain virtual memory state for each thread.
Last Answer : (B) OS maintains only CPU registers for each thread.
Description : Assuming that the disk head is located initially at 32, find the number of disk moves required with FCFS if the disk queue of I/O block requests are 98, 37, 14, 124, 65, 67: (A) 310 (B) 324 (C) 320 (D) 321
Last Answer : (D) 321
Description : How much space will be required to store the bit map of a 1.3 GB disk with 512 bytes block size ? (A) 332.8 KB (B) 83.6 KB (C) 266.2 KB (D) 256.6 KB
Last Answer : (A) 332.8 KB
Description : Consider a disk queue with request for input/output to block on cylinders 98, 183, 37, 122, 14, 124, 65, 67 in that order. Assume that disk head is initially positioned at cylinder 53 and moving ... and 252 cylinders (B) 640 and 236 cylinders (C) 235 and 640 cylinders (D) 235 and 252 cylinders
Last Answer : Answer: 236 and 208 cylinders Explanation: SSTF Initial head position =53 The closest queue to initial head position=65 head moves from 53 to 65=12 head moves from 65 to 67=2 head moves from 67 ... 122=24 head moves from 122 to 124=2 head moves from 124 to 183=59 Total head movement=208
Description : Consider a disk with 16384 bytes per track having a rotation time of 16 msec and average seek time of 40 msec. What is the time in msec to read a block of 1024 bytes from this disk? (A) 57 msec (B) 49 msec (C) 48 msec (D) 17 msec
Last Answer : Answer: B
Description : File management function of the operating system includes i) File creation and deletion ii) Disk scheduling iii) Directory creation iv) Mapping file in secondary storage. A) i, ii and iii only B) i, iii and iv only C) ii, iii and iv only D) All i, ii, iii and iv
Last Answer : B) i, iii and iv only
Description : The distributed system is a collection of (P) and communication is achieved in distributed system by (Q) , where (P) and (Q) are : (A) Loosely coupled hardware on tightly ... message passing ,respectively. (D) Loosely coupled software on tightly coupled hardware and file sharing, respectively.
Last Answer : (C) Tightly coupled software on loosely coupled hardware and message passing ,respectively.
Description : How does Space allocation table place within a block ?
Last Answer : Each block contains entries as follows Fixed block header Variable block header Row Header,row date (multiple rows may exists) PCTEREE (% of free space for row updation in future)
Description : The agency that sits between the user and the UNIX system is called the A. logic B. profile C. shell D. erxc E. None of the above
Last Answer : C. shell
Description : State true or false. i) Unix, support multiple user process but only support one thread per process. ii) A java run time environment is an example of a system of one process with multiple threads. A) True, False B) True, True C) False, True D) False, False
Last Answer : B) True, True
Description : ……………….. is a example of an operating system that support single user process and single thread. A) UNIX B) MS-DOS C) OS/2 D) Windows 2000
Last Answer : B) MS-DOS
Description : Which statement is not true about process 0 in the Unix operating system? (A) Process 0 is called init process. (B) Process 0 is not created by fork system call. (C) After forking process 1, process 0 becomes swapper process. (D) Process 0 is a special process created when system boots.
Last Answer : (A) Process 0 is called init process.
Description : Which of the following option with reference to UNIX operating system is not correct? (A) INT signal is sent by the terminal driver when one types and it is a request to terminate the current operation. ( ... that it defaults to producing a core dump if not caught. (D) KILL is a blockable signal.
Last Answer : (D) KILL is a blockable signal.
Description : In UNIX operating system, when a process creates a new process using the fork() system call, which of the following state is shared between the parent process and child process? (A) Heap (B) Stack (C) Shared memory segments (D) Both Heap and Stack
Last Answer : (C) Shared memory segments
Description : Which statement is not correct about “init” process in Unix? (1) It is generally the parent of the login shell. (2) It has PID 1. (3) It is the first process in the system. (4) Init forks and execs a ‘getty’ process at every port connected to a terminal.
Last Answer : It is the first process in the system.
Description : . ………………… is a special type of integrity constraint that relates two relations & maintains consistency across the relations. A) Entity Integrity Constraints B) Referential Integrity Constraints
Last Answer : B) Referential Integrity
Description : Which of the following statement is true? i) Using singly linked lists and circular list, it is not possible to traverse the list backwards. ii) To find the predecessor, it is required to traverse the list from the first ... linked list. A) i-only B) ii-only C) Both i and ii D) None of both
Last Answer : C) Both i and ii
Description : Consider an implementation of unsorted single linked list. Suppose it has its representation with a head and a tail pointer (i.e. pointers to the first and last nodes of the linked list). Given the ... the front node of the linked list. (D) Deletion of the last node of the linked list.
Last Answer : (D) Deletion of the last node of the linked list.
Description : Data store in a DFD represents. A) a sequential file B) a disk store C) a repository of data
Last Answer : C) a repository of data
Description : The ability to find an individual item in a file immediately _____ is used. 1) File allocation table 2) Directory 3) Sequential access 4) Direct access 4 5) None of these
Last Answer : Answer :1
Description : The ability to find an individual item in a file immediately _____ is used: a) file allocation table b) directory c) sequential access d) direct access e) None of The Above
Last Answer : a) file allocation table
Description : FAT stands for 1) File Accomdation Table 2) File Access Tape 3) File Allocation Table 4) File Activity Table
Last Answer : 3) File Allocation Table
Description : FAT stands for 1 File Accomdation Table 2 File Access Tape 3 File Allocation Table 4 File Activity Table
Last Answer : 3 File Allocation Table
Description : Suppose there are four processes in execution with 12 instances of a Resource R in a system. The maximum need of each process and current allocation are given below: With reference to current allocation, is system safe? If so, ... B) Yes, P1 P2 P3 P4 (C) Yes, P4 P3 P1 P2 (D) Yes, P2 P1 P3 P4
Last Answer : (C) Yes, P4 P3 P1 P2
Description : In Unix, how do you check that two given strings a and b are equal ? (A) test $a -eq $b (B) test $a -equal $b (C) test $a=$b (D) Sh -C test $a==$b
Last Answer : (C) test $a=$b Answer: C Explanation: Tests for a zero-length string: test -z string Tests for a nonzero string length: test -n string Tests two strings for equality: ... Tests two strings for inequality: test string1 != string2 Tests for a nonzero string length: test string
Description : The Unix command: $ vi file1 file2 (A) Edits file1 and stores the contents of file1 in file2 (B) Both files i.e. file1 and file2 can be edited using ex' command to travel between files (C) Both ... using the mv' command to move between the files (D) Edits file1 first, saves it and the edits file2
Last Answer : (B) Both files i.e. file1 and file2 can be edited using ‘ex’ command to travel between files
Description : In UNIX, processes that have finished execution but have not yet had their status collected are known as ................ (A) Sleeping processes (B) Stopped Processes (C) Zombie Processes (D) Orphan Processes
Last Answer : (C) Zombie Processes