MCQ on Stack and Queue. This queue allow insertion at both ends but deletions only at one end. Similarly, in a queue, you can add elements at one end and remove elements from the other. Initially, Queue is empty so rear and front both have assigned a value -1. If the front index is -1, then front is incremented and set to 0. Queue in Data Structure. 1. ii. The conditions to detect queue full and queue empty are In linked list implementation of a queue, front and rear pointers are tracked. a) 0. b) 7. c) 9. Queue Data Structure | Studytonight MCQs on Queue using Linked List. Else we decrement front and insert the element. Definition: Deque or the Doubly ended queue is a data structure or operation performed under queue where insertion and deletion are allowed at both ends.. A deque is an ordered collection of items similar to that of a queue. Queues MCQs Questions Answers - Data Structures ... What Linear Queue? ; A pointer rear that points the last item of the queue. Explanation: The answer is a, i.e., front=rear= -1. This section provides you a brief description about Circular Queue in Data Structure Tutorial with Algorithms, Syntaxes, Examples, and solved programs, Aptitude Solutions and Interview Questions and Answers. 4. ENQUEUE - It is the operation to insert elements into the queue. Q2. If anyone tries to join from the front or from the middle, people will push him out of the line and tell him to go back. A linear list of elements in which deletion can be done from one end (front) and insertion can take place only at the other end (rear) is known as _____________. When Queue Empty : REAR was equal to FRONT when empty ( because in the starting before filling the queue FRONT = REAR = 0 ) Hence Option A is correct. Otherwise, if the queue already has some values, then REAR is incremented so that it points to the next location in the array. . SURVEY. d) none of these. ANSWER: b) Front= (rear+1)%MAX_SIZE. Answer: a. Thus queue becomes full. c b a. Q.69 A two dimensional array TABLE [6] [8] is stored in row major . When Queue Full : ( REAR+1)%n = (4+1)%5 = 0 FRONT is also 0. A dequeue or a double ended queue is a queue with insert/delete defined for both front and rear ends of the queue. Insertion in queue occurs at the REAR end, and deletion from queue occurs at the FRONT end. There are two primary operations in the queue. insert (Q, i) — inserts the integer i at the rear of the queue. holds the elements of the stack. (A) From the front of the queue. In this data structure elements are stored in the FIFO technique. The correct way to initialize an empty queue is: q->front = NULL; q->rear = NULL; The queue display uses a while loop to find the end of the queue, thus guaranteeing that temp will be NULL in the subsequent for loop (i.e. In Step 3, the value is stored in the queue at the location pointed by REAR. b) Input restricted dequeue. Top 20) D. all of the above. The insertion of next element takes place at the array index of__. The time needed to insert element in a queue of length n is: 1.O(1) , 2.O(log2n), 3.O(n), 4.O(n*log2n) The overflow condition for the linear queue is rear =MAX-1 as there is no space left in the Queue if rear = MAX-1. In a stack, if a user tries to remove an element from an empty stack, the situation is called: 4. Conditions for the queue to be a circular queue. I have implemented the queue with a linked list, keeping track of a front pointer and a rear pointer. Algorithm for input restricted dequeue. c) To empty a queue. The operations that can be performed on the queue are: i. isEmpty (Q) — returns true if the queue is empty, false otherwise. If there is a queue in front of a theatre, the person in the front will exit the queue and then go inside the theatre. then =Q [front] Enqueue Dequeue A circular queue is implemented using an array of size 10. 250+ TOP MCQs on Queue Operations and Answers. Step2 [delete element at the front end ] if [front] >= 0 then. For storing the front and rear in circular queue, we use rear = (rear + 1) % size and front = (front + 1) % size. Apply Filters. Pushing an element into a stack already having five elements and a stack of size 5, then the stack becomes: 5. Question 10: Consider a queue of size 5. 4. c) Double ended queue. The process of removing an element from stack is called: 3. A queue is an abstract data type data structure that allows operations on both ends. b) Front = rear + 1 c) Rear = MAX_SIZE - 1 d) Rear = front; e) None of above; Answer: c. Major role of queue server in _____ a) Simulation of heapsort b) Simulation of arbitrary linked list c) Simulation of limited resource allocation d) Simulation of recursion; e) Both a&b; Answer: c. Which is not the type of queue? 1, 2) then again we are displaying front element. In the linked list implementation of the queue class, where does the push member function place the new entry on the linked list? Output: the number of eleents in the queue Algorithm isEmpty(Q, front, rear) Input: an array Q of capacity N the index of the front element, the rear index where a new element should be added Output: true if the queue contains no elements. ; A pointer front that points the first item of the queue. As wise people believe "Perfect Practice make a Man Perfect". b) Only rear pointer. 7) A. 2. finding factorial tower of Hanoi infix to postfix conversion all of the above . A queue data structure used an array or linked list during its implementation. segfault). Initially, REAR = FRONT = 0. We have 10 leaves node. Which of these pointers will change during an insertion into an EMPTY queue? The new node is placed at the front of the linked list 8) A. FIFO 9) A. FIFO lists 10) B. pop 11) C. Stacks 12) C. TOP 13) A. Clarification: Linear list of elements in which deletion is done . So the internal node which has two children will be 1 less than no. Thus, front = rear if and only if there are no elements in the queue. Hence ( REAR + 1 ) %n is equal to FRONT. B. the beginning of the queue and REAR represents the index number of the element at the end of the Queue. Describe why it is a bad idea to implement a linked list version a queue which uses the head of the list as the rear of the queue. When Queue Full : ( REAR+1)%n = (4+1)%5 = 0 FRONT is also 0. MCQs on Queue using Linked List. A queue is an abstract data type data structure that allows operations on both ends. a) Contact areas of the tyres. d) Difference in the toe angles of the left and right wheels. a) Rear = MAX_SIZE - 1 b) Front = (rear + 1)mod MAX_SIZE c) Front = rear + 1 d) Rear = front Answer: a Explanation: When Rear = MAX_SIZE - 1, there will be no space left for the elements to be added in queue. Question: 3. Step1 [check for under flow condition] if front = -1 & rear = -1, then. of leaves. After inserting an element in the last position, the next element again gets inserted into the first position. The element which we enqueued first is the first element to be dequeued from the queue. Hence ( REAR + 1 ) %n is equal to FRONT. A B C. Front Rear. In Stack, insertion operation is known as Push whereas deletion operation is known as Pop. 1. D. Fetch the element at the front end of the dequeue. Difficulty Easy Medium Hard. This set of Data Structure Multiple Choice Questions & Answers (MCQs) focuses on "Queue Operations". If you want to know the total number of elements in the queue, then you use this formula (REAR - FRONT) +1. The array index starts with 0, front is 6, and rear is 9. A circular queue will be full when Front = -1 and Rear = max - 1. the first element that is added to the queue is the first one to be removed.. a) Insertion b) Deletion c) To empty a queue d) Both Insertion and To empty a queue View Answer Queue is also an abstract data type or a linear data structure, just like stack data structure, in which the first element is inserted from one end called the REAR(also called tail), and the removal of existing element takes place from the other end called as FRONT(also called head).. Before you continue reading about queue data structure, check these topics before to understand it clearly: In this data structure elements are stored in the FIFO technique. DEQUEUE - It is the operation to delete elements from the queue. (C) From the rear of the queue. In linked list implementation of a queue, front and rear pointers are tracked. Fully solved online Data Structure practice objective type / multiple choice questions and answers with explanation. Queue in Data Structure. In linked list implementation of queue, if only front pointer is maintained, which of the following operation take worst case linear time? Report an issue. As you can see, the pattern followed is called FI A dequeue operation removes an element. It has a front, a rear and the items can be positioned from both ends allowing it to provide a hybrid linear structure with all the capabilities of stacks and queues in a . While defining an abstract data type as a mathematical concept, space and efficiency is not a major concern. C. Every abstract data type can be implemented using any programming language. 1.Neither of them changes, 2.Only front_ptr changes, 3.Only rear_ptr changes, 4.Both change A linear list of elements in which deletion can be done from one end (front) and insertion can take place only at the other end (rear) is known as a? Both will point to the first element. It is a linear data structure. return queue[front] end procedure Implementation of peek() function in C programming language − int peek() { return queue[front]; } isfull() As we are using single dimension array to implement queue, we just check for the rear pointer to reach at MAXSIZE to determine that the queue is full. ii. Data Structure Multiple Choice Questions on "Queue Operations". Question 3 Explanation: If the list is empty, this new node will point to 'trail' and will be pointed at by 'head'. View Answer & Solution. From the front of the queue. The essential condition which is checked before insertion in a linked queue is? A queue data structure used an array or linked list during its implementation. Just like in the above example, people exit from the front and enter from behind. Front = (rear + 1)mod MAX_SIZE C. Front = rear + 1 D. Rear = front. The process of inserting an element in stack is called: 2. a) Only front pointer b) Only rear pointer c) Both front and rear pointer d) No pointer will be changed Answer: b Clarification: Since queue follows FIFO so new element inserted at last. Act of adding values into a stack is called. Step 1 : If FRONT = -1 : then Write : "Queue Underflow" and return [End of If structure] Step 2 : Set NUM := QUEUE[FRONT] Step 3 : Write "Deleted item is : ", NUM Step 4 : Set FRONT := FRONT + 1. Data Structure (MCQs) questions with answers are very useful for freshers, interview, campus placement preparation, bank exams, experienced professionals, computer science students, GATE exam, teachers etc. Ungraded. The queue data structure is a linear type of data structure that is used to store the elements. Data Structures and Algorithms Objective type Questions and Answers. A. -- Neither changes -- Only front pointer changes. Bonus Gigs are bonus tasks associated with each problem. output underflow & exit. A circular queue is implemented using an array of size 10. Which of these pointers will change during an insertion into EMPTY queue? A queue with insert/delete defined for both front and rear ends of the queue A linear list of elements in which deletion can be done from one end (front) and insertion can take place only at the other end (rear) is known as _____ insert (Q, i) — inserts the integer i at the rear of the queue. A queue implemented with a doubly linked list: C. A queue implemented with both singly and doubly linked lists: D. A queue with insert/delete defined for front side of the queue: Answer» a. If REAR = size of the queue, then the queue is full. Queues are data structures that follow the First In First Out (FIFO) i.e. 1. In liked representation of stack ……. iii. (B) From any place in the queue. Assume that the insertion and deletion operation are carried out using REAR and FRONT as array index variables, respectively. ; It has three components: A Container of items that contains elements of queue. How to Download Queue using Linked List | Data Structure MCQs pdf free download Question and Answers with explanations? Think of it as a line of people waiting for a bus. 1. Data Structure. D. None of the above. a) Insertion. 30 seconds. Queue - Circular Queue | Data Structure Tutorial with C & C++ Programming. The initial condition then is front = rear = 0. 20. This makes the queue a FIFO structure. 2. A. Rear = MAX_SIZE - 1 B. Insert at the rear end of the dequeue. Underflow Overflow Front value Rear value. In the circular queue, when the rear reaches the end of the queue, then rear is reset to zero. element given above is the first to be popped from the queue. a)Toe-in b)Toe out c)Positive camber d)Positive castor. If any element is deleted from a queue, then the value of front . Which of these pointers will change during an insertion into a NONEMPTY queue? It is a linear data structure. A normal queue, if implemented using an array of size MAX_SIZE, gets full when - MCQSCENTER. Only the for loop is needed. View Answer. It supports FIFO (First In First Out) property. Queue Operations Data Structure MCQs and Answers 1. 2. A queue with insert/delete defined for both front and rear ends of the queue. Implementation Logic. Initialize rear = front = -1. The purpose of turning radius gauges is to measure the. (a) cannot have more than 19 nodes (c) has exactly 17 nodes (b) has exactly 19 nodes d) cannot have more than 17 nodes. Then using printf statement we are displaying the first element, then we are deleting the front element twice (i.e. c) Both front and rear pointer. Otherwise, traverse till the end of the list and insert the new node there. 3. View Answer / Hide Answer. Output restricted de-queue —. Show Answer. MCQs for Introduction to management (Management Principals) also can be known as introduction to business . -- Only rear pointer changes. b) Free play of the steering wheel. All the internal node will have 2 children. . MCQ 117: Which of the following is an application of stack? Q. Just like in the above example, people exit from the front and enter from behind. delete (Q) — deletes the element at the front of the queue and returns its value. What Linear Queue? The insertion of next element takes place at the array index. Q1. Now, we can check for the conditions. This makes the queue a FIFO structure. QUEUE. It is considered as sequence of items. Complete them to ensure maximum learning out of each problem and to earn Gig-Coins. Ans: A. MCQs on Queue with answers 1. Question 5. ; It has three components: A Container of items that contains elements of queue. Show the status of Front and Rear in each step. Deletion operation is done using ……… in a queue. Suppose front is zero, and rear is one less than the . ; Insertion is performed from REAR end. This section focuses on the "Queue" of the Data Structure. In linked list implementation of queue, if only front pointer is maintained, which of the following operation take worst case linear time? Introducing Bonus Gigs. Answer: Option 'A'. 14) Name dequeue in which insertion can be done from bith rear and front end. Hence overflow condition is reached. a) Output restricted dequeue. If FRONT = REAR, then there is at least one element in the queue. enqueue does not properly handle appending to a non-empty list. The get_front function would require linear time. When Queue Empty : REAR was equal to FRONT when empty ( because in the starting before filling the queue FRONT = REAR = 0 ) Hence Option A is correct. These Multiple Choice Questions (mcq) should be practiced to improve the Data Structure skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations. 1. 18. Now, we can check for the conditions. a) Only front pointer. delete (Q) — deletes the element at the front of the queue and returns its value. d) No pointer will be changed. A. If the front of the front wheels is inside and rear of front wheels are apart when the vehicle is at rest, then the configuration is called? Hence overflow condition is reached. If the queue is empty then intialize front and rear to 0. It supports FIFO (First In First Out) property. Hence overflow condition is reached. Insert elements 2, 4, 6, 8 and then delete first two elements. Similarly, in a queue, you can add elements at one end and remove elements from the other. So my front still points to 0 and my rear keeps on incrementing based on my insert operation. << Prev Set 1 Set 2 Set 3 Set 4 Set 5 Set 6 Set 7 Set 8 Set 9 Set 10 Set 11 Set 12 Set 13 Set 14 Set 15 Set 16 Set 17 Set 18 Set 19 Set 20 Set 21 Set 22 Set 23 Set 24 Set 25 Set 26 . The Answers are explained in . 30) The time complexity of enqueue operation in Queue is __ O . 17. 16. Ans: In input restricted dequeue , insertion can be done only in rear end whereas deletion can be done in both rear and front end. 58.Queues serve major role in _____ a) Simulation of recursion b) Simulation of arbitrary linked list Insertion in queue occurs at the REAR end, and deletion from queue occurs at the FRONT end. What goes wrong if we try to keep all the items at the front of a partially-filled array (so that data[0] is always the front). Q. On the other hand, in a circular queue, the overflow condition is front=(rear+1) mod max because the last element is connected to the first element in a circular queue. Now if I take array as my storage DS, so let's say I have n as the size for my array A. So when I insert an element then I will make the rear = rear + 1. IndianStudyHub is providing all Queue using Linked List | Data Structure MCQs pdf free download questions and answers along with detailed explanation and Answers in an easy and understandable way. User push 1 element in the stack having already five elements and having stack size as 5 then stack becomes. 48) Consider the implementation of the singly linked list having the head pointer only in the representation. Later queue found to be having the elements 3, 2, 1, 5. Q.68 Assume that a queue is available for pushing and popping elements. Elements are always added to the back and removed from the front. So with me I make use of queue when I want some functionality like FIFO(First IN First OUT). Read Next: Interview Questions on Stack and Queue in Data Structure set-2 Read More: Data Structure MCQ Questions ; Insertion is performed from REAR end. Explanation: Strictly binary tree means a node can have 2 or 0 children only. return (N - front + rear ) mod N runtime = O(1) Which of these pointers will you change during an insertion into a NONEMPTY queue? Push 16) A. LIFO 17) C. Pop 18) A. front 19) A. A queue with insert/delete defined for both front and rear ends of the queue: B. 3. Step 5 : If FRONT>REAR : then In queue insertion are performed on one end (Rear) and deletion is performed on other end (Front) it is also known as FIFO (First In First Out). A. The queue data structure is a linear type of data structure that is used to store the elements. Definition of Queue • A Queue is an ordered collection of items from which items may be deleted at one end (called the front of the queue) and into which items may be inserted at the other end (the rear of the queue). A linear list of elements in which deletion can be done from one end (front) and insertion can take place only at the other end (rear) is known as a ? When Queue Full : ( REAR+1)%n = (4+1)%5 = 0 FRONT is also 0. The conventions we shall adopt for these two variables are that front is always 1 less than the actual front of the queue and rear always points to the last element in the queue. a) Single ended queue b . ; A pointer front that points the first item of the queue. ; A pointer rear that points the last item of the queue. Since we are using circular array, we have to keep in mind that if front is equal to 0 then instead of decreasing it by 1 we make it equal to SIZE-1. iii. keeping track of front, rear, and manyItems (the number of items in the array). 16. Front ==0 and rear=n-1 . For this reason a queue is sometimes called a FIFO (first-in first-out) list as opposed . front rear v v [1][2][3][4][ ][ ] Your implementation has them pointing one element previous. Consider a linked list implementation of a queue with two pointers: front and rear. You have implemented a queue with a linked list keeping track of a front pointer and a rear pointer. • The first element inserted into the queue is the first element to be removed. When the circular queue is empty means that no element is available in the queue then the front and rear are initialized with a -1 value. After deleting, insert 10, 12 in the queue. Suppose a circular queue of capacity (n - 1) elements is implemented with an array of n elements. d) Both Insertion and To empty a queue. Thus queue becomes full. Answer: Both front and rear pointer. To insert a new data, rear should be incremented by 1. A normal queue, if implemented using an array of size MAX_SIZE, gets full when. The array index starts with 0, front is 6, and rear is 9. By practicing these MCQs of Queue MCQs (Data Structure ) MCQs - Latest Competitive MCQs , an individual for exams performs better than before.This post comprising of objective questions and answers related to "Queue MCQs (Data Structure ) mcqs ". It helps in refilling all the free spaces. A. Abstract data type is a useful tool for specifying the logical properties of the data type. This set of Data Structure Multiple Choice Questions & Answers (MCQs) focuses on "Queue using Linked List". input sequence a, b, c, (c be the first element), give the output sequence of elements if the rightmost. Similarly, People Exit the Queue only from the Front. Data Structure MCQ - Queue. Answer: Question 11: (i) Give the number of elements in a circular queue, (ii) With 12 memory locations if Front - 10 and. Question Type Coding MCQ. 58.Queues serve major role in _____ a) Simulation of recursion b) Simulation of arbitrary linked list Suppose you are given an implementation of a queue of integers. If FRONT = 0, then the queue is empty. It is considered as sequence of items. When Queue Empty : REAR was equal to FRONT when empty ( because in the starting before filling the queue FRONT = REAR = 0 ) Hence Option A is correct. Cancel. a) Rear = MAX_SIZE - 1 b) Front = (rear + 1)mod MAX_SIZE c) Front = rear + 1 d) Rear = front Answer: a Explanation: When Rear = MAX_SIZE - 1, there will be no space left for the elements to be added in queue. EXPLANATION: Given, Rear = Front = 0 If a new element is inserted in the queue, then which of the following statements is correct? 15. 5. Queue Data Structure MCQS Questions & Answers. Data Structure and Algorithms - Stack,Queue MCQs Based Online Test-1. 12. Hence ( REAR + 1 ) %n is equal to FRONT. Clear All. (D) None of above. There are 5 short answer questions and 14 multiple choice questions . This Data Structure and Algorithms - Stack,Queue MCQs Based Online Test-1 /Quiz Specifically contain those Multiple Choice Questions and answers which were already asked in the Previous Competitive Exams.These Questions mainly focused on below lists of Topics. -- Both change Given an. In case the queue is empty, then both FRONT and REAR are set to zero, so that the new value can be stored at the 0th location. Ans. c) Turning radius of the left and right wheels. Filters. Stacks. Part 1: Objective questions and answers of Automobile Engineering. Let there is a queue whose initial values for Front and Rear are 0 and 1 respectively. The problem of managing the circular queue is overcome if the first position of the queue comes after the last position of the queue. In case we maintain the 1 - Question. b) Deletion. The operations that can be performed on the queue are: i. isEmpty (Q) — returns true if the queue is empty, false otherwise. MCQ 116: In a priority queue, insertion and deletion takes place at _____ front, rear end only at rear end only at front end any position . Reverse 14) B. push 15) A. Now, we can check for the conditions. C. Fetch the element at the rear end of the dequeue. When a circular queue is implemented in an array, then when there is only one element in the queue, then Front=Rear - 1. Most implementations of a Queue use front to point to the head element of the queue and rear to point to the first empty element at the rear of the queue:.