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

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
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Answer :

(C) Shared memory segments 
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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.

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.

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

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

Match the following types of variables with the corresponding programming languages: (a) Static variables (i) Local variables in Pascal (b) Stack dynamic (ii) All variables in APL (c) Explicit heap dynamic (iii) Fortran 77 (d) Implicit heap dynamic (iv) All objects in JAVA Codes: (a) (b) (c) (d) (A) (i) (iii) (iv) (ii) (B) (iv) (i) (iii) (ii) (C) (iii) (i) (iv) (ii) (D) (ii) (i) (iii) (iv)

Description : Match the following types of variables with the corresponding programming languages: (a) Static variables (i) Local variables in Pascal (b) Stack dynamic (ii) All variables in APL (c) Explicit heap dynamic (iii) Fortran 77 (d) Implicit ... (ii) (C) (iii) (i) (iv) (ii) (D) (ii) (i) (iii) (iv)

Last Answer : (C) (iii) (i) (iv) (ii) 

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 statement is correct? (A) OS maintains only scheduling and accounting information for each thread. (B) OS maintains only CPU registers for each thread. (C) OS does not maintain a separate stack for each thread. (D) OS does not maintain virtual memory state for each thread.

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.

A specific editor has 200 K of program text, 15 K of initial stack, 50 K of initialized data, and 70 K of bootstrap code. If five editors are started simultaneously, how much physical memory is needed if shared text is used ? (A) 1135 K (B) 335 K (C) 1065 K (D) 320 K

Description : A specific editor has 200 K of program text, 15 K of initial stack, 50 K of initialized data, and 70 K of bootstrap code. If five editors are started simultaneously, how much physical memory is needed if shared text is used ? (A) 1135 K (B) 335 K (C) 1065 K (D) 320 K

Last Answer : (B) 335 K

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.

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.

In UNIX, ............ creates three subdirectories: 'PIS' and two subdirectories 'progs' and ‘data’ from just created subdirectory 'PIS'. (A) mdkir PIS/progs PIS/data PIS (B) mkdir PIS progs data (C) mkdir PIS PIS/progs PIS/data (D) mkdir PIS/progs data

Description : In UNIX, ............ creates three subdirectories: 'PIS' and two subdirectories 'progs' and ‘data’ from just created subdirectory 'PIS'. (A) mdkir PIS/progs PIS/data PIS (B) mkdir PIS progs data (C) mkdir PIS PIS/progs PIS/data (D) mkdir PIS/progs data

Last Answer : (C) mkdir PIS PIS/progs PIS/data

……………….. 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

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

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) store list of file names plus pointers associated with i-nodes (D) store information entered by a user application program or utility program

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 

Which of the following option with reference to UNIX operating system is not correct?

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.

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

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

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 files can be edited using the ‘mv’ command to move between the files (D) Edits file1 first, saves it and the edits file2

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

What is the difference between the stack and the heap?

Description : What is the difference between the stack and the heap?

Last Answer : The stack is a local memory reserve where the program stores variable and function data. The heap is a special memory reserve where the programmer can dynamically allocate memory from. The heap is useful ... large to make certain variables, he just constructs one of the right size during run-time.

Is a struct stored on the heap or stack?

Description : Is a struct stored on the heap or stack? 

Last Answer : Stack

What is a heap and a stack?

Description : What is a heap and a stack?

Last Answer : There are 2 kinds of heap - 1: a chunk of memory where data is stored and 2: a tree based data structure. When we talk about the heap and the stack we mean the first kind of ... a LIFO data structure that stores variables and flow control information. Typically each thread will have its own stack.

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 coupled software and disk sharing, respectively. (B) Tightly coupled hardware on loosely coupled software and shared memory, respectively. (C) Tightly coupled software on loosely coupled hardware and message passing ,respectively. (D) Loosely coupled software on tightly coupled hardware and file sharing, respectively.

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. 

Which of the following is not the internal sort? A) Insertion Sort B) Bubble Sort C) Merge Sort D) Heap Sort

Description : Which of the following is not the internal sort? A) Insertion Sort B) Bubble Sort C) Merge Sort D) Heap Sort

Last Answer : C) Merge Sort

Which of the following algorithms has lowest worst case time complexity? a) Insertion sort b) Selection sort c) Quick sort d) Heap sort

Description : Which of the following algorithms has lowest worst case time complexity? a) Insertion sort b) Selection sort c) Quick sort d) Heap sort

Last Answer : d) Heap sort

Consider the situation in which assignment operation is very costly. Which of the following sorting algorithm should be performed so that the number of assignment operations is minimized in general? a) Insertion sort b) Selection sort c) Heap sort d) None

Description : Consider the situation in which assignment operation is very costly. Which of the following sorting algorithm should be performed so that the number of assignment operations is minimized in general? a) Insertion sort b) Selection sort c) Heap sort d) None

Last Answer : b) Selection sort

Which of the following is not an in-place sorting algorithm? a) Selection sort b) Heap sort c) Quick sort d) Merge sort

Description : Which of the following is not an in-place sorting algorithm? a) Selection sort b) Heap sort c) Quick sort d) Merge sort

Last Answer : merge sort

Which of the following is a stable sorting algorithm? a) Merge sort b) Typical in-place quick sort c) Heap sort d) Selection sort

Description : Which of the following is a stable sorting algorithm? a) Merge sort b) Typical in-place quick sort c) Heap sort d) Selection sort

Last Answer : a) Merge sort

Which one of the following array represents a binary max-heap? (A) [26, 13, 17, 14, 11, 9, 15] (B) [26, 15, 14, 17, 11, 9, 13] (C) [26, 15, 17, 14, 11, 9, 13] (D) [26, 15, 13, 14, 11, 9, 17]

Description : Which one of the following array represents a binary max-heap? (A) [26, 13, 17, 14, 11, 9, 15] (B) [26, 15, 14, 17, 11, 9, 13] (C) [26, 15, 17, 14, 11, 9, 13] (D) [26, 15, 13, 14, 11, 9, 17]

Last Answer : (C) [26, 15, 17, 14, 11, 9, 13]

What is the function of following UNIX command? WC – l<a >b& (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 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. (C) It counts the errors during the execution of a process, a, and puts the result in process b. (D) It copies the ‘ l ’ numbers of lines of program from file, a, and stores in file b.

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.

………. Involves treating main memory as a resource to be allocated to and shared among a number of active processes. A) Partition management B) Memory management C) Disk management D) All of the above

Description : ………. Involves treating main memory as a resource to be allocated to and shared among a number of active processes. A) Partition management B) Memory management C) Disk management D) All of the above

Last Answer : B) Memory management

Consider the following statements : S1: A queue can be implemented using two stacks. S2: A stack can be implemented using two queues. Which of the following is correct ? (A) S1 is correct and S2 is not correct. (B) S1 is not correct and S2 is correct. (C) Both S1 and S2 are correct. (D) Both S1 and S2 are not correct.

Description : Consider the following statements : S1: A queue can be implemented using two stacks. S2: A stack can be implemented using two queues. Which of the following is correct ? (A) S1 is correct and S2 is not correct. ( ... S2 is correct. (C) Both S1 and S2 are correct. (D) Both S1 and S2 are not correct.

Last Answer : (C) Both S1 and S2 are correct.

The different types of tables maintained by the operating system are ............. A) memory, logical , I/O file B) memory, I/O, file, physical C) memory, I/O, file, process D) memory, logical, I/O, physical

Description : The different types of tables maintained by the operating system are ............. A) memory, logical , I/O file B) memory, I/O, file, physical C) memory, I/O, file, process D) memory, logical, I/O, physical

Last Answer : C) memory, I/O, file, process

The typical elements of process image are ..................... i) User data ii) System Data iii) User program iv) System stack A) i, iii and iv only B) i, ii, and iv only C) ii, iii, and iv only D) All i, ii, iii, and iv

Description : The typical elements of process image are ..................... i) User data ii) System Data iii) User program iv) System stack A) i, iii and iv only B) i, ii, and iv only C) ii, iii, and iv only D) All i, ii, iii, and iv

Last Answer : A) i, iii and iv only

Match the following mechanisms for interrupting the execution of a process and their uses. i) Interrupt a) Call to an operating system function ii) Trap b) Reaction to an asynchronous external event iii) Supervisor Call c) Handling of a error or an exception condition A) i-a, ii-b, iii-c B) i-c, ii-a, iii-b C) i-b, ii-c, iii-a D) i-a, ii-c, iii-b

Description : Match the following mechanisms for interrupting the execution of a process and their uses. i) Interrupt a) Call to an operating system function ii) Trap b) Reaction to an asynchronous external event iii) Supervisor Call c) Handling of a error ... -a, iii-b C) i-b, ii-c, iii-a D) i-a, ii-c, iii-b

Last Answer : C) i-b, ii-c, iii-a

State true of false. i) A node is a parent if it has successor nodes. ii) A node is child node if out degree is one. A) True, True B) True, False C) False, True D) False, False

Description : State true of false. i) A node is a parent if it has successor nodes. ii) A node is child node if out degree is one. A) True, True B) True, False C) False, True D) False, False

Last Answer : B) True, False

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

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

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 : 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

Last Answer : (C) 16 GB

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

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

................. maintains the list of free disk blocks in the Unix file system. (A) I-node (B) Boot block (C) Super block (D) File allocation table

Description : ................. maintains the list of free disk blocks in the Unix file system. (A) I-node (B) Boot block (C) Super block (D) File allocation table

Last Answer : (C) Super block 

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

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

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 when the system boots and runs as long as the system is up. (C) Cron reads configuration files that contain list of command lines and the times at which they invoked. (D) Crontab for individual users are not stored.

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.

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) An i-node contains accounting information as well as enough information to locate all the disk blocks that holds the file’s data. (C) Each i-node is 256-bytes long. (D) All the files and directories are stored in data blocks.

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.

Which of the following file transfer utility creates a shared folder metaphor using a Web CSE-R17.BLOGSPOT.COM service?a) Dropbox b) Skype c) Drive d) All of the mentioned

Description : Which of the following file transfer utility creates a shared folder metaphor using a Web CSE-R17.BLOGSPOT.COM service?a) Dropbox b) Skype c) Drive d) All of the mentioned

Last Answer : Dropbox

A pure ALOHA Network transmit 200 bit frames using a shared channel with 200 Kbps bandwidth. If the system (all stations put together) produces 500 frames per second, then the throughput of the system is .............. (A) 0.384 (B) 0.184 (C) 0.286 (D) 0.586

Description : A pure ALOHA Network transmit 200 bit frames using a shared channel with 200 Kbps bandwidth. If the system (all stations put together) produces 500 frames per second, then the throughput of the system is .............. (A) 0.384 (B) 0.184 (C) 0.286 (D) 0.586

Last Answer : (B) 0.184

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

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

A unix file may be of type: (A) Regular file (B) Directory File (C) Device File (D) Any one of the above

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

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

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]

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

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

In Unix, the login prompt can be changed by changing the contents of the file ............... (A) contrab (B) init (C) gettydefs (D) inittab

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

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

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 

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]’

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]’ 

Which company did SCO sue for using code UNIX in its Operating System ? 1) RedaHat 2) SuSE 3) IBM 4) Microsoft

Description : Which company did SCO sue for using code UNIX in its Operating System ? 1) RedaHat 2) SuSE 3) IBM 4) Microsoft

Last Answer : 4) Microsoft

Projects of complex organizations usually require input from several functional departments, which creates A. Overlapping B. Shared Responsibility C. Both A and B

Description : Projects of complex organizations usually require input from several functional departments, which creates A. Overlapping B. Shared Responsibility C. Both A and B

Last Answer : Both A and B