Toughest Data Structure Exam Quiz!

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  • 1/66 Questions

    Insert, Append, Delete, and Next are all valid list operations.

    • True
    • False
Please wait...
About This Quiz


Data structure is the specific way to store and organize information so that the data can be successfully accessed. For this quiz, you should understand what a valid list operation is, the name of the second child vertex on a binary tree, all trees' property, how many children each vertex has, etc. This quiz will thoroughly prepare you for the most challenging data structure exam.

Toughest Data Structure Exam Quiz! - Quiz

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  • 2. 

    Which are the Stack Methods?

    • Enqueue(X), Dequeue(), Size(), isQueueEmpty(), Front()

    • POP(), PUSH(X), SIZE(), isStackEmpty(), TOP()

    • Size(), Front(), Push(X), Pop()

    Correct Answer
    A. POP(), PUSH(X), SIZE(), isStackEmpty(), TOP()
    Explanation
    The correct answer includes the methods POP(), PUSH(X), SIZE(), isStackEmpty(), and TOP(). These methods are commonly used in stack data structures. POP() is used to remove the top element from the stack, PUSH(X) is used to add an element to the top of the stack, SIZE() is used to determine the number of elements in the stack, isStackEmpty() is used to check if the stack is empty, and TOP() is used to retrieve the top element of the stack without removing it.

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  • 3. 

    A Red-Black tree is a BST tree.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    A Red-Black tree is a type of self-balancing binary search tree (BST). It follows the properties of a BST, where each node has a key value and its left child has a smaller key, while its right child has a larger key. Additionally, a Red-Black tree also maintains the color property, where each node is either red or black, and it satisfies the following conditions: the root is black, all leaves (null nodes) are black, and no two adjacent nodes are red. Therefore, a Red-Black tree is indeed a BST.

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  • 4. 

    A hash table tends to perform better overall (bot time and space) than an array, linked list, or balanced B.S.T.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    A hash table is a data structure that allows for efficient insertion, deletion, and retrieval of elements. It uses a hash function to map keys to indices in an array, allowing for constant time complexity for these operations on average. In contrast, arrays, linked lists, and balanced binary search trees have varying time complexities for these operations. Arrays have constant time complexity for accessing elements but require shifting elements for insertion and deletion. Linked lists have constant time complexity for insertion and deletion but require traversal for accessing elements. Balanced binary search trees have logarithmic time complexity for all operations. Therefore, a hash table generally performs better overall in terms of time and space efficiency compared to these other data structures.

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  • 5. 

    Linear probing uses the number of times the rehash function has been applied as a value in the hash formula.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Linear probing is a collision resolution technique used in hash tables. When a collision occurs, linear probing searches for the next available slot in the hash table by incrementing the index. The given statement is true because in linear probing, the number of times the rehash function has been applied (also known as the probing sequence) is used as a value in the hash formula. This helps to determine the next index to be checked during the probing process.

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  • 6. 

    All AVL trees are BST.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    An AVL tree is a self-balancing binary search tree (BST) that maintains its balance factor, which is the difference between the heights of its left and right subtrees, within a certain range. Since AVL trees are a type of BST, they inherit all the properties of a BST, including the property that the value of each node's left child is less than the value of the node itself, and the value of each node's right child is greater than the value of the node itself. Therefore, all AVL trees are BSTs.

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  • 7. 

    An ordered tree in which each vertex has either no children, one child, or two children.

    • Sub Tree

    • Ordered Tree

    • Binary Tree

    Correct Answer
    A. Binary Tree
    Explanation
    A binary tree is a type of ordered tree where each vertex can have either no children, one child, or two children. This means that every vertex in a binary tree can have either zero, one, or two child vertices. Other types of ordered trees, such as a sub tree, do not have this specific restriction on the number of child vertices. Therefore, the given correct answer is binary tree.

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  • 8. 

    Every vertex has two children or is a leaf.

    • Perfect Binary Tree

    • Full Binary Tree

    Correct Answer
    A. Full Binary Tree
    Explanation
    A full binary tree is a type of binary tree where every vertex has either two children or is a leaf. This means that every node in the tree has either zero or two children, and there are no nodes with only one child. Therefore, the given statement aligns with the definition of a full binary tree.

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  • 9. 

    For a normal (double-linked) binary tree, 8 pointers are assigned to each node.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    4

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  • 10. 

    Inserting a node in an AVL tree will sometimes change the height of the tree.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    When a node is inserted into an AVL tree, it may cause an imbalance in the tree, which means that the heights of the left and right subtrees of some nodes may differ by more than 1. In order to maintain the balance property of the AVL tree, rotations are performed to restore the balance. These rotations can change the height of the tree because they may change the positions of nodes and the lengths of paths from the root to the leaves. Therefore, inserting a node in an AVL tree can indeed change the height of the tree.

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  • 11. 

    In Stack Methods: ____ removes the top object of the stack and returns it.

    • PUSH(X)

    • POP()

    • SIZE()

    • IsStackEmpty()

    • TOP()

    Correct Answer
    A. POP()
    Explanation
    The POP() method in stack removes the top object of the stack and returns it. This method is used to retrieve and remove the most recently added element from the stack. It decreases the size of the stack by one and returns the element that was removed.

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  • 12. 

    In Stack Methods: ____ Returns a boolean inidcating if the stack is empty.

    • PUSH(X)

    • POP()

    • SIZE()

    • IsStackEmpty()

    • TOP()

    Correct Answer
    A. IsStackEmpty()
    Explanation
    The method isStackEmpty() returns a boolean value indicating whether the stack is empty or not. This method can be used to check if there are any elements present in the stack before performing any operations. If the stack is empty, the method will return true, otherwise it will return false.

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  • 13. 

    An Array is what kind of data structure.

    • Linear

    • Non- Linear

    • Complex

    • All the above

    • None

    Correct Answer
    A. Linear
    Explanation
    The correct answer is Linear because an array is a type of data structure that stores elements in a sequential manner, where each element can be accessed using its index. The elements in an array are stored in contiguous memory locations, making it easy to traverse the elements in a linear fashion.

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  • 14. 

    The length of the longest path from a vertex to a leaf that is a descendent of the vertex.

    • Height

    • Depth

    Correct Answer
    A. Height
    Explanation
    The length of the longest path from a vertex to a leaf that is a descendant of the vertex is referred to as the height of the vertex. The height of a vertex measures the distance from the vertex to the farthest leaf in the tree. It is important in determining the overall structure and balance of a tree.

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  • 15. 

    Property of all trees.

    • #Edges = #Nodes - 1

    • #Nodes = #Edges - 1

    Correct Answer
    A. #Edges = #Nodes - 1
    Explanation
    In a tree, the number of edges is always one less than the number of nodes. This is because a tree is a connected graph with no cycles, and every edge connects two nodes. So, if we have "n" nodes in a tree, we will have "n-1" edges.

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  • 16. 

    The minimum height of a 14-node B.S.T. is 5

    • True

    • False

    Correct Answer
    A. False
    Explanation
    3

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  • 17. 

    The process of creating a B.S.T. (requires/does not require) sorting data.

    • Requires

    • Does Not Require

    Correct Answer
    A. Requires
    Explanation
    To create a Binary Search Tree (BST), sorting of data is required. A BST is a binary tree where each node has a key greater than all keys in its left subtree and smaller than all keys in its right subtree. In order to maintain this property, the data needs to be sorted while creating the BST. Without sorting, it would be impossible to ensure that the keys are placed correctly in the tree, violating the BST property. Therefore, the process of creating a BST requires sorting the data.

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  • 18. 

    In Stack Methods: ____ Inserts object X onto the stack.

    • PUSH(X)

    • POP()

    • SIZE()

    • IsStackEmpty()

    • TOP()

    Correct Answer
    A. PUSH(X)
    Explanation
    PUSH(X) is the correct answer because it is the method used to insert an object X onto the stack. The PUSH(X) operation adds the element X to the top of the stack, increasing the size of the stack by 1. This operation is commonly used in stack data structures to add new elements and maintain the LIFO (Last-In-First-Out) property.

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  • 19. 

    A Stack follows the principle of?

    • LIFO

    • FIFO

    • BOTH A and B

    • None

    Correct Answer
    A. LIFO
    Explanation
    A stack follows the principle of LIFO, which stands for "Last In, First Out". This means that the last element added to the stack is the first one to be removed. It operates like a stack of plates, where the last plate added is the first one that can be taken out. This principle is commonly used in computer science and data structures, where elements are added and removed from the top of the stack.

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  • 20. 

    Which are the Queue Methods?

    • Enqueue(X), Dequeue(), Size(), isQueueEmpty(), Front()

    • POP(), PUSH(X), SIZE(), isStackEmpty(), TOP()

    • Size(), Front(), Push(X), Pop()

    Correct Answer
    A. Enqueue(X), Dequeue(), Size(), isQueueEmpty(), Front()
    Explanation
    The correct answer includes the methods Enqueue(X), Dequeue(), Size(), isQueueEmpty(), and Front(). These methods are commonly used in queue data structures. Enqueue(X) is used to add an element to the back of the queue, Dequeue() is used to remove an element from the front of the queue, Size() returns the number of elements in the queue, isQueueEmpty() checks if the queue is empty, and Front() returns the element at the front of the queue without removing it.

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  • 21. 

    With every push in the stack the top:

    • Decrements by one

    • Increments by one

    • Stays there itself

    • Its always a 0

    • None

    Correct Answer
    A. Increments by one
    Explanation
    In a stack, the top represents the position of the most recently added element. When a new element is pushed into the stack, it becomes the new top, thus incrementing the position by one. Therefore, the correct answer is "increments by one."

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  • 22. 

    A BST tree is always balanced.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    AVL

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  • 23. 

    Linear probing is not a good solution for clustering.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Linear probing is a technique used in hashing to resolve collisions by sequentially searching for the next available slot in the hash table. However, it is not a good solution for clustering because it can lead to clustering of elements in adjacent slots. This means that if multiple elements hash to the same slot, they will be placed next to each other in the table, causing inefficient access and potentially increasing the likelihood of further collisions. Therefore, linear probing can result in poor performance and decreased efficiency in clustered data.

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  • 24. 

    ______ is a data structure in which elements are added to the rear and removed from the front. A First-In-First-Out (FIFO) structure.

    Correct Answer
    queue
    Explanation
    A queue is a data structure that follows the First-In-First-Out (FIFO) principle, meaning that the element added first will be the first one to be removed. Elements are added to the rear of the queue and removed from the front. This ensures that the order in which elements are added is preserved when removing them, making it suitable for scenarios such as managing tasks or processing requests in the order they were received.

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  • 25. 

    Reading a book (cover to cover) is an example of Pre Order Traversal.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Pre-order traversal is a method used in tree data structures where the root node is visited first, followed by the left subtree, and then the right subtree. Similarly, when reading a book from cover to cover, we start with the first page (root), then move on to the next pages on the left (left subtree), and finally continue with the pages on the right (right subtree). Therefore, reading a book from cover to cover can be considered an example of pre-order traversal.

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  • 26. 

    What is the disadvantage of a binary search?

    • Fast

    • Time consuming

    • Needs a sorted array

    • Does not needs a sorted array

    • ALL

    Correct Answer
    A. Needs a sorted array
    Explanation
    The disadvantage of a binary search is that it requires a sorted array. This means that if the array is not already sorted, it would need to be sorted before the binary search can be performed. Sorting an array can be a time-consuming process, especially for large arrays. Therefore, the need for a sorted array is a drawback of using a binary search algorithm.

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  • 27. 

    In Stack Methods: ____ returns the top object of the stack without removing it.

    • PUSH(X)

    • POP()

    • SIZE()

    • IsStackEmpty()

    • TOP()

    Correct Answer
    A. TOP()
    Explanation
    The TOP() method returns the top object of the stack without removing it. This means that it allows us to access the element at the top of the stack without modifying the stack itself. It is useful when we want to peek at the top element without actually removing it from the stack.

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  • 28. 

    Identify the UnderFlow condition for a Stack.

    • If( top < 1)

    • If(top > 1)

    • If(top > N)

    • If( top < N)

    • None

    Correct Answer
    A. If( top < 1)
    Explanation
    The correct answer is "if( top < 1)". This condition checks if the top of the stack is less than 1, indicating that the stack is empty or underflowing. In a stack, the top variable represents the index of the topmost element. If the top is less than 1, it means that there are no elements in the stack, and any attempt to pop or retrieve an element would result in an underflow condition.

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  • 29. 

    Identify the OverFlow condition for a Queue.

    • If(REAR > N)

    • If(REAR < = FRONT)

    • If(REAR < 0)

    • If(FRONT > REAR)

    • NONE

    Correct Answer
    A. If(REAR > N)
    Explanation
    The correct answer is "if(REAR > N)". This condition checks if the rear index of the queue is greater than the maximum size of the queue (N). If this condition is true, it indicates that the queue has reached its maximum capacity and any further insertion of elements will result in an overflow condition.

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  • 30. 

    Which data structure is best suited to print the documents in the printer?

    • Stacks

    • Queues

    • Both Stacks and Queues

    • Arrays

    • None

    Correct Answer
    A. Queues
    Explanation
    Queues are the best data structure for printing documents in a printer because they follow the First-In-First-Out (FIFO) principle. When documents are sent to the printer, they are added to the end of the queue, and the printer processes them in the order they were added. This ensures that the documents are printed in the same sequence they were requested, maintaining fairness and preventing any document from being skipped or delayed. Stacks, on the other hand, follow the Last-In-First-Out (LIFO) principle, which would not be suitable for printing documents in the desired order.

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  • 31. 

    To Delete an item from a Queue identify the correct set of statements:-

    • Q[REAR] = item; REAR ++;

    • Item = Q[FRONT]; FRONT++;

    • Item = Q[REAR]; FRONT ++;

    • Item = Q[FRONT]; REAR ++;

    • NONE

    Correct Answer
    A. Item = Q[FRONT]; FRONT++;
    Explanation
    The correct set of statements to delete an item from a Queue is "item = Q[FRONT]; FRONT++;". This is because when deleting an item from a Queue, we need to remove the item at the front of the Queue. So, we assign the value of the item at the front to the variable "item" and then increment the value of "FRONT" to point to the next item in the Queue. This effectively removes the item from the Queue.

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  • 32. 

    Postfix notation may not contain negative numbers.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Postfix notation, also known as Reverse Polish Notation (RPN), is a mathematical notation in which operators are placed after their operands. In postfix notation, negative numbers are represented by using a unary minus operator before the number. Therefore, it is not possible to directly represent negative numbers in postfix notation without using the unary minus operator. Hence, the statement that postfix notation may not contain negative numbers is true.

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  • 33. 

    Reading a book (cover to cover) is an example of Post Order Traversal

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Pre order

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  • 34. 

    What is the advantage of a linear search?

    • Fast

    • Time consuming

    • Needs a sorted array

    • Does not needs a sorted array

    • ALL

    Correct Answer
    A. Does not needs a sorted array
    Explanation
    The advantage of a linear search is that it does not require the array to be sorted. This means that it can be used on unsorted data, making it a flexible and versatile search algorithm. Unlike other search algorithms that require a sorted array, a linear search can be performed on any type of data, regardless of its order. This makes it a useful option in situations where the data is not already sorted or where sorting the data would be time-consuming or not feasible.

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  • 35. 

    All parents have the same depth, but not necessarily the same height.

    • True - parents

    • False - siblings

    Correct Answer
    A. False - siblings
    Explanation
    This statement is false because siblings are individuals who share at least one parent. While siblings may have the same depth (meaning they have a common ancestor), they do not necessarily have the same height, which refers to the generation level or distance from the root of the family tree. Siblings can have different heights depending on their birth order and age differences.

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  • 36. 

    The maximum height of a 14-node B.S.T. is 13

    • True

    • False

    Correct Answer
    A. False
    Explanation
    15

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  • 37. 

    In Stack Methods: ____ rreturns the # of objects in the stack.

    • PUSH(X)

    • POP()

    • SIZE()

    • IsStackEmpty()

    • TOP()

    Correct Answer
    A. SIZE()
    Explanation
    The correct answer is SIZE() because the SIZE() method is used to determine the number of objects present in the stack. It returns the count of objects in the stack, allowing us to know the current size of the stack.

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  • 38. 

    Which one is the Application of Stack?

    • Polished Notations

    • Storing return addresses of function calls

    • Reversing a String

    • Recursion

    • All of the Above

    Correct Answer
    A. All of the Above
    Explanation
    The application of a stack includes polished notations, storing return addresses of function calls, reversing a string, and recursion. Polished notations refer to the use of stacks in mathematical expressions to ensure the correct order of operations. Storing return addresses of function calls is a common use of stack in programming languages to keep track of the sequence of function calls. Reversing a string can also be achieved using a stack data structure. Recursion, which involves a function calling itself, can also be implemented using a stack to keep track of function calls. Therefore, all of the given options are correct applications of a stack.

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  • 39. 
    What is the In Order Traversal:give your answer like 2 3 5 6 7 - ProProfs

    What is the In Order Traversal:give your answer like 2 3 5 6 7

    Correct Answer
    6 13 17 27 33 42 48
    Explanation
    The given sequence of numbers is already in ascending order. In an in-order traversal of a binary tree, the left subtree is visited first, followed by the root, and then the right subtree. Since the given sequence is already sorted, it can be considered as an in-order traversal of a binary tree with no left or right subtrees. Therefore, the answer is the same as the given sequence: 6 13 17 27 33 42 48.

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  • 40. 

    The "best case" search time for a B.S.T. is O(n). (where n = the number of nodes in the tree)

    • True

    • False

    Correct Answer
    A. False
    Explanation
    ^worst case

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  • 41. 

    Resolving a hash collision by sequentially searching a hash table beginning at the location returned by the hash function.

    • Clustering

    • Bucket

    • Linear Probing

    • Chain

    Correct Answer
    A. Linear Probing
    Explanation
    Linear probing is a technique used to resolve hash collisions in a hash table. When a collision occurs, instead of immediately finding an empty slot in the table, linear probing sequentially searches the table starting from the location returned by the hash function. It checks each subsequent slot until an empty slot is found, allowing the item to be inserted into the table. This process helps to minimize clustering, where consecutive collisions occur in the same location, by spreading out the items more evenly throughout the table.

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  • 42. 

    What is the contents of the array after the execution of the following program :-int a[] = {10,30, 20, 10, 30, 40};for(i=1;i<=6;i++) {   for(j=i+1 ; j<= 6; j++)   {      if(a[i] == a[j])      {         a[j] = 0;      }}

    • Same

    • 10,10, 20, 20, 30, 40

    • 10,0 20, 0, 30, 40

    • 10,30, 20, 0, 0, 40

    • 40, 30 ,10, 0, 0, 0

    Correct Answer
    A. 10,30, 20, 0, 0, 40
    Explanation
    The program is checking for duplicate elements in the array and replacing them with 0. The outer loop iterates through each element of the array, and the inner loop compares it with the subsequent elements. If a duplicate is found, the inner loop replaces the duplicate element with 0.

    In the given array, the first element 10 has a duplicate at index 4, so it is replaced with 0. The second element 30 has a duplicate at index 5, so it is also replaced with 0. The resulting array after executing the program will be 10, 30, 20, 0, 0, 40.

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  • 43. 

    An ordered tree in which each vertex has 0, 1, or 2 children.

    Correct Answer
    Binary Tree
    Explanation
    A binary tree is a type of ordered tree where each vertex can have at most two children. This means that each vertex can have either 0, 1, or 2 children. The term "binary" refers to the fact that each vertex can have a maximum of two children. In a binary tree, the left child is typically smaller than the parent, and the right child is typically larger. This type of tree is commonly used in computer science and data structures due to its efficient search and traversal properties.

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  • 44. 

    Write the postfix notation of A + B * C / D

    • ABCD+*/

    • AB*/CD+

    • ABC*D/+

    • ABCD*+/

    • A+B*C/D

    Correct Answer
    A. ABC*D/+
    Explanation
    The given expression is A + B * C / D. In postfix notation, the operators are placed after their operands. To convert the expression to postfix, we start by placing A and B as operands. Then, we encounter the multiplication operator * and place it after B. Next, we encounter the division operator / and place it after C. Finally, we encounter the addition operator + and place it after the operands A * C / D. Therefore, the postfix notation of the given expression is ABC*D/+.

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  • 45. 

    Which Data structure is best suited for the UNDO operation in Windows?

    • Stack

    • Queues

    • Both Stack and Queues

    • Arrays

    • None

    Correct Answer
    A. Stack
    Explanation
    The UNDO operation in Windows typically requires reversing the most recent action performed. A stack data structure is best suited for this operation because it follows the Last-In-First-Out (LIFO) principle. Each action performed is added to the top of the stack, and when the UNDO operation is triggered, the most recent action is removed from the top of the stack, effectively reversing it. This makes a stack the ideal choice for implementing the UNDO functionality in Windows.

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  • 46. 

    A In Order traversal may be used to print an arithmetic expression

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Pre order

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  • 47. 

    Find the value of the postfix expression :- ABCD ^*-  (IF A = 150, B=10, C=2 D=3)

    • 70

    • 80

    • 150

    • 0

    • 1500

    Correct Answer
    A. 70
    Explanation
    The given postfix expression is ABCD ^*- . According to the postfix evaluation rule, we start by evaluating the operands A, B, C, and D. Given that A = 150, B = 10, C = 2, and D = 3, we substitute these values into the expression. The expression becomes 150 10 2 3 ^*- . Now, we evaluate the expression from left to right. First, we perform the exponentiation operation (^) on 2 and 3, which gives us 8. Then, we perform the multiplication operation (*) on 10 and 8, which gives us 80. Finally, we perform the subtraction operation (-) on 150 and 80, which gives us 70. Therefore, the correct answer is 70.

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  • 48. 

    Write the prefix notation of A + B * C / D

    • /*+ABCD

    • +/*DCBA

    • +/*BCDA

    • ABCD+*/

    • /*+BDCA

    Correct Answer
    A. +/*BCDA
    Explanation
    The given expression is A + B * C / D. In prefix notation, the operator is placed before the operands. The correct answer +/*BCDA follows the prefix notation as it starts with the addition operator "+", followed by the multiplication operator "*", then the division operator "/", and finally the operands B, C, D, and A in that order.

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  • 49. 

    To delete an item from an array which loop is correct, where p is the position of deletion( assume array starts from 1 and N is the max no. of items in the array.)

    • For(i=N;i>=pos;i--) { a[i] = a[i+1]; }

    • For(i=pos;i

    • For(i=pos;i

    • For(i=pos-1;i

    • None

    Correct Answer
    A. For(i=pos;i
    Explanation
    The correct loop to delete an item from an array at position p is "for(i=pos;i

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  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • May 02, 2015
    Quiz Created by
    Maheshjangid962

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