Which of the following statements is not true for Multi Level Feedback Queue processor scheduling algorithm? (A) Queues have different priorities. (B) Each queue may have different scheduling algorithm (C) Processes are permanently assigned to a queue (D) This algorithm can be configured to match a specific system under design

Which of the following statements is not true for Multi Level Feedback Queue processor scheduling algorithm? (A) Queues have different priorities. (B) Each queue may have different scheduling algorithm (C) Processes are permanently assigned to a queue (D) This algorithm can be configured to match a specific system under design
by

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Answer :

(C) Processes are permanently assigned to a queue
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Consider three CPU intensive processes P1, P2, P3 which require 20, 10 and 30 units of time, arrive at times 1, 3 and 7 respectively. Suppose operating system is implementing Shortest Remaining Time first (preemptive scheduling) algorithm, then .............. context switches are required (suppose context switch at the beginning of Ready queue and at the end of Ready queue are not counted). (A) 3 (B) 2 (C) 4 (D) 5

Description : Consider three CPU intensive processes P1, P2, P3 which require 20, 10 and 30 units of time, arrive at times 1, 3 and 7 respectively. Suppose operating system is implementing Shortest Remaining Time first (preemptive scheduling) ... end of Ready queue are not counted). (A) 3 (B) 2 (C) 4 (D) 5

Last Answer : (A) 3

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.

Consider a disk queue with I/O requests on the following cylinders in their arriving order: 6,10,12,54,97,73,128,15,44,110,34,45 The disk head is assumed to be at cylinder 23 and moving in the direction of decreasing number of cylinders. Total number of cylinders in the disk is 150. The disk head movement using SCAN-scheduling algorithm is: (1) 172 (2) 173 (3) 227 (4) 228

Description : Consider a disk queue with I/O requests on the following cylinders in their arriving order: 6,10,12,54,97,73,128,15,44,110,34,45 The disk head is assumed to be at cylinder 23 and moving in the direction ... . The disk head movement using SCAN-scheduling algorithm is: (1) 172 (2) 173 (3) 227 (4) 228

Last Answer : (2) 173

The …………….. policy segments the disks request queue into sub queues of the length N. A) SCAN B) C-SCAN C) N-Step SCAN D) FSCAN

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Last Answer : C) N-Step SCAN

Some of the criteria for calculation of priority of a process are: a. Processor utilization by an individual process. b. Weight assigned to a user or group of users. c. Processor utilization by a user or group of processes. In fair share scheduler, priority is calculated based on: (1) only (a) and (b) (2) only (a) and (c) (3) (a), (b) and (c) (4) only (b) and (c)

Description : Some of the criteria for calculation of priority of a process are: a. Processor utilization by an individual process. b. Weight assigned to a user or group of users. c. Processor utilization by a user or group of processes. In fair share ... (a) and (c) (3) (a), (b) and (c) (4) only (b) and (c)

Last Answer : (3) (a), (b) and (c)

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 service are not influenced by file allocation method. (C) Caching the directories and index blocks in main memory can also help in reducing disk arm movements. (D) SCAN and C-SCAN algorithms are less likely to have a starvation problem.

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.

Consider the following justifications for commonly using the two-level CPU scheduling : I. It is used when memory is too small to hold all the ready processes. II. Because its performance is same as that of the FIFO. III. Because it facilitates putting some set of processes into memory and a choice is made from that. IV. Because it does not allow to adjust the set of in-core processes. Which of the following is true ? (A) I, III and IV (B) I and II (C) III and IV (D) I and III

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Last Answer : (D) I and III

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

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

A virtual memory based memory management algorithm partially swaps out a process. This is an example of (A) short term scheduling (B) long term scheduling (C) medium term scheduling (D) mutual exclusion

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Last Answer : (C) medium term scheduling

A scheduling Algorithm assigns priority proportional to the waiting time of a process. Every process starts with priority zero (lowest priority). The scheduler re-evaluates the process priority for every 'T' time units and decides next process to be scheduled. If the process have no I/O operations and all arrive at time zero, then the scheduler implements .............. criteria. (A) Priority scheduling (B) Round Robin Scheduling (C) Shortest Job First (D) FCFS

Description : A scheduling Algorithm assigns priority proportional to the waiting time of a process. Every process starts with priority zero (lowest priority). The scheduler re-evaluates the process priority for every 'T' time ... (A) Priority scheduling (B) Round Robin Scheduling (C) Shortest Job First (D) FCFS

Last Answer : (B) Round Robin Scheduling

There are three processes P1, P2 and P3 sharing a semaphore for synchronising a variable. Initial value of semaphore is one. Assume that negative value of semaphore tells us how many processes are waiting in queue. Processes access the semaphore in following order: (a) P2 needs to access (b) P1 needs to access (c) P3 needs to access (d) P2 exits critical section (e) Pi exits critical section The final value of semaphore will be: (1) 0 (2) 1 (3) -1 (4) -2

Description : There are three processes P1, P2 and P3 sharing a semaphore for synchronising a variable. Initial value of semaphore is one. Assume that negative value of semaphore tells us how many processes are waiting in queue. Processes access ... The final value of semaphore will be: (1) 0 (2) 1 (3) -1 (4) -2 

Last Answer : Answer: 1

In process scheduling, ………………… determines which ready process will be executed next by processor. A) long term scheduling B) medium term scheduling C) short term scheduling D) none of the above

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Last Answer : C) short term scheduling

In process scheduling, …………………… determines when new processes are admitted to the system. A) long term scheduling B) medium term scheduling C) short term scheduling D) none of the above

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Last Answer : A) long term scheduling

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

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Last Answer : (C) Scheduling parameters

Which scheduling service is used to handle traffic with different priorities? (1) Traffic management (2) QoS traffic scheduling (3) QoS Scheduler (4) Qos Manager

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Consider the following statements for priority queue: S1: It is a data structure in which the intrinsic ordering of the elements does determine the result of its basic operations. S2: The elements of a priority queue may be complex structures that are ordered on one or several fields. Which of the following is correct? (A) Both S1 and S2 are incorrect. (B) S1 is correct and S2 is incorrect. (C) SI is incorrect and S2 is correct. (D) Both S1 and S2 are correct.

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

The advantage of …………….. is that they solve the problem if sequential storage representation. But disadvantage in that is they are sequential lists. A) Lists B) Linked Lists C) Trees D) Queues

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Last Answer : B) Linked Lists

How do you determine priorities in scheduling your time? Give examples.

Description : How do you determine priorities in scheduling your time? Give examples.

Last Answer : Give an example of a situation where you had to multitask and juggle several priorities. Explain your thought process as you determined which tasks were the top priorities.

The technique for establishing and maintaining priorities among the various jobs of a project, is known (A) Event flow scheduling technique (B) Critical ratio scheduling (C) Slotting technique for scheduling (D) Short interval scheduling

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Last Answer : (B) Critical ratio scheduling

.............. refers to a situation in which a process is ready to execute but is continuously denied access to a processor in deference to other processes. A) Synchronization B) Mutual Exclusion C) Dead lock D) Starvation

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Last Answer : D) Starvation

_________ is a data area shared by hardware devices or program processes that operate at different speeds or with different sets of priorities. A. Flash memory B. Virtual memory C. Buffer D. None of the Above

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Last Answer : C. Buffer

State true of false. i) Public can only be assigned to class ii) Protected protects a statement iii) Protected method is never accessible outside the package iv) Friendly variable may be accessible outside class A) i-true, ii-true, iii-false, iv-true B) i-true, ii-false, iii-true, iv-false C) i-false, ii-true, iii-false, iv-false D) i-true, ii-false, iii-false, iv-true

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Last Answer : C) i-false, ii-true, iii-false, iv-false

Which of the following provides the best description of an entity type? (A) A specific concrete object with a defined set of processes (e.g. Jatin with diabetes) (B) A value given to a particular attribute (e.g. height-230 cm) (C) A thing that we wish to collect data about zero or more, possibly real world examples of it may exist. (D) A template for a group of things with the same set of characteristics that may exist in the real world

Description : Which of the following provides the best description of an entity type? (A) A specific concrete object with a defined set of processes (e.g. Jatin with diabetes) (B) A value given to a ... template for a group of things with the same set of characteristics that may exist in the real world

Last Answer : Answer: D

Consider the following statements: (a) Depth - first search is used to traverse a rooted tree. (b) Pre - order, Post-order and Inorder are used to list the vertices of an ordered rooted tree. (c) Huffman's algorithm is used to find an optimal binary tree with given weights. (d) Topological sorting provides a labelling such that the parents have larger labels than their children. Which of the above statements are true ? (A) (a) and (b) (B) (c) and (d) (C) (a) , (b) and (c) (D) (a), (b) , (c) and (d)

Description : Consider the following statements: (a) Depth - first search is used to traverse a rooted tree. (b) Pre - order, Post-order and Inorder are used to list the vertices of an ordered rooted tree. (c) Huffman's algorithm is used to find an optimal ... (d) (C) (a) , (b) and (c) (D) (a), (b) , (c) and (d)

Last Answer : (D) (a), (b) , (c) and (d)

One of the disadvantages of user level threads compared to Kernel level threads is (1) If a user level thread of a process executes a system call, all threads in that process are blocked. (2) Scheduling is application dependent. (3) Thread switching doesn’t require kernel mode privileges. (4) The library procedures invoked for thread management in user level threads are local procedures.

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Last Answer : If a user level thread of a process executes a system call, all threads in that process are blocked.

The seven elements A, B, C, D, E, F and G are pushed onto a stack in reverse order, i.e., starting from G. The stack is popped five times and each element is inserted into a queue. Two elements are deleted from the queue and pushed back onto the stack. Now, one element is popped from the stack. The popped item is ................... (1) A (2) B (3) F (4) G

Description : The seven elements A, B, C, D, E, F and G are pushed onto a stack in reverse order, i.e., starting from G. The stack is popped five times and each element is inserted into a queue. Two elements are deleted from the queue and pushed ... The popped item is ................... (1) A (2) B (3) F (4) G

Last Answer : Answer: 2

In a simple and visual method of Cell design, the priorities in classifying may be in the order a.Rotational or non rotational – Material – Size – Shape b.Material – Rotational or non rotational – Size – Shape c.Size – Rotational or non rotational – Material – Shape d.Shape – Rotational or non rotational – Material – Size

Description : In a simple and visual method of Cell design, the priorities in classifying may be in the order a.Rotational or non rotational †Material †Size †Shape b.Material †Rotational or non ... non rotational †Material †Shape d.Shape †Rotational or non rotational †Material †Size

Last Answer : a.Rotational or non rotational – Material – Size – Shape

Which of the following algorithm design technique is used in the quick sort algorithm? a) Dynamic programming b) Backtracking c) Divide-and-conquer d) Greedy method

Description : Which of the following algorithm design technique is used in the quick sort algorithm? a) Dynamic programming b) Backtracking c) Divide-and-conquer d) Greedy method

Last Answer : Which of the following algorithm design technique is used in the quick sort algorithm? a) Dynamic programming b) Backtracking c) Divide-and-conquer d) Greedy method

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.

How do you permanently delete items in the Itunes Download queue? I purchased a TV series and it gave me two of every show (one HD and one normal).

Description : How do you permanently delete items in the Itunes Download queue? I purchased a TV series and it gave me two of every show (one HD and one normal).

Last Answer : I honestly think you haveto just let it download and then delete it. I went through the same thing. I downloaded them while I was sleeping so it didn’t slow me down at all.

Which of the following scheduling algorithms may cause starvation? a. First-come-first-served b. Round Robin c. Priority d. Shortest process next e. Shortest remaining time first (1) a, c and e (2) c, d and e (3) b, d and e (4) b, c and d

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Last Answer : Answer: 2

Which of the following statements is/are true w.r.t. Enterprise Resource Planning (ERP)? (A) ERP automates and integrates majority of business processes. (B) ERP provides access to information in a Real Time Environment. (C) ERP is inexpensive to implement. (1) (A), (B) and (C) are false. (2) (A) and (B) false; (C) true. (3) (A) and (B) true; (C) false (4) (A) true; (B) and (C) are false

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Last Answer : Answer: 3

To determine the efficiency of an algorithm the time factor is measured by: (A) Counting micro seconds (B) Counting number of key operations (C) Counting number of statements (D) Counting kilobytes of algorithm

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Last Answer : (B) Counting number of key operations

One aspect that has to be dealt with by the integrity subsystem is to ensure that only valid values can be assigned to each data items. This is referred to as A) Data Security B) Domain access C) Data Control

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Last Answer : C) Data Control

A kiosk a) is data organised and presented in a manner that has additional value beyond t he value of the data itself b) combines microscopic electronic components on a single integrated circuit that processes bits according to software instructions c) is a computer station that provides the public with specific and useful information and service d) describes a computer's type, processor, and operating system e) None of these

Description : A kiosk a) is data organised and presented in a manner that has additional value beyond t he value of the data itself b) combines microscopic electronic components on a single integrated circuit that ... and service d) describes a computer's type, processor, and operating system e) None of these

Last Answer : c) is a computer station that provides the public with specific and useful information and service

In an operating system, indivisibility of operation means : (A) Operation is interruptable (B) Race - condition may occur (C) Processor can not be pre-empted (D) All of the above

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Last Answer : (C) Processor can not be pre-empted 

……………. Allows definitions and query language statements to be entered; query results are formatted and displayed. A) Schema Processor B) Query Processor C) Terminal Interface D) None of the above

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Last Answer : C) Terminal Interface

What is a queue? Give a real life example.

Description : What is a queue? Give a real life example.

Last Answer : A: It is a linear data structure which follows the FIFO (First In First out) pattern. Real life example: Queue at the ticket counter

……… is not the operation that can be performed on queue. A) Insertion B) Deletion C) Retrieval D) Traversal

Description : ……… is not the operation that can be performed on queue. A) Insertion B) Deletion C) Retrieval D) Traversal

Last Answer : D) Traversal

In a circular queue the value of r will be .. A) r=r+1 B) r=(r+1)% [QUEUE_SIZE – 1] C) r=(r+1)% QUEUE_SIZE D) r=(r-1)% QUEUE_SIZE

Description : In a circular queue the value of r will be .. A) r=r+1 B) r=(r+1)% [QUEUE_SIZE – 1] C) r=(r+1)% QUEUE_SIZE D) r=(r-1)% QUEUE_SIZE

Last Answer : C) r=(r+1)% QUEUE_SIZE

In a queue, the initial values of front pointer f rare pointer r should be ….. and …….. respectively. A) 0 and 1 B) 0 and -1 C) -1 and 0 D) 1 and 0

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Which of the following is not the type of queue? A) Ordinary queue B) Single ended queue C) Circular queue D) Priority queue

Description : Which of the following is not the type of queue? A) Ordinary queue B) Single ended queue C) Circular queue D) Priority queue

Last Answer : B) Single ended queue

………… is very useful in situation when data have to stored and then retrieved in reverse order. A) Stack B) Queue C) List D) Link list

Description : ………… is very useful in situation when data have to stored and then retrieved in reverse order. A) Stack B) Queue C) List D) Link list

Last Answer : A) Stack

……………. Is a pile in which items are added at one end and removed from the other. A) Stack B) Queue C) List D) None of the above

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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

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

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 towards cylinder number 0. The total number of head movements using Shortest Seek Time First (SSTF) and SCAN algorithms are respectively (A) 236 and 252 cylinders (B) 640 and 236 cylinders (C) 235 and 640 cylinders (D) 235 and 252 cylinders

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 

If the queue is implemented with a linked list, keeping track of a front pointer and a rear pointer, which of these pointers will change during an insertion into a non-empty queue? (A) Neither of the pointers change (B) Only front pointer changes (C) Only rear pointer changes (D) Both of the pointers changes

Description : If the queue is implemented with a linked list, keeping track of a front pointer and a rear pointer, which of these pointers will change during an insertion into a non-empty queue? (A) Neither of ... (B) Only front pointer changes (C) Only rear pointer changes (D) Both of the pointers changes

Last Answer : (C) Only rear pointer changes

Five jobs A, B, C, D and E are waiting in Ready Queue. Their expected runtimes are 9, 6, 3, 5 and x respectively. All jobs entered in Ready queue at time zero. They must run in ............. order to minimize average response time if 3 < x < 5. (A) B, A, D, E, C (B) C, E, D, B, A (C) E, D, C, B, A (D) C, B, A, E, D

Description : Five jobs A, B, C, D and E are waiting in Ready Queue. Their expected runtimes are 9, 6, 3, 5 and x respectively. All jobs entered in Ready queue at time zero. They must run in ............. order to minimize average response time if 3 < ... , C (B) C, E, D, B, A (C) E, D, C, B, A (D) C, B, A, E, D

Last Answer : (B) C, E, D, B, A

A station in a network forwards incoming packets byplacing them on its shortest output queue. Whatrouting algorithm is being used? A. hot potatorouting B. flooding C. static routing D. delta routing E. None of the above

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Last Answer : hot potatorouting