Data Structures MCQs with Answers
Practice important Data Structures MCQs with answers and explanations.
Multiple Choice Questions
Q201: In the C++ implementation of the priority queue, what is the role of the remove() method?
- A: Adds an element to the queue
- B: Returns and removes the element with highest priority
- C: Checks if the queue is empty
- D: Sorts the elements in the queue
View Answer
B
Q202: What happens if the remove() method is called on an empty queue?
- A: The method returns the last element
- B: The method throws an exception
- C: The method returns NULL and prints an error message
- D: The queue is automatically resized
View Answer
C
Q203: Which method in the PriorityQueue class returns the number of elements currently in the queue?
- A: insert()
- B: remove()
- C: full()
- D: length()
View Answer
D
Q204: What does the insert() method in the PriorityQueue class do after adding an element?
- A: It sorts the elements in descending order
- B: It sorts the elements in ascending order
- C: It checks if the queue is full
- D: It displays a message if the queue is full
View Answer
B
Q205: In a binary tree, what is a leaf node?
- A: A node with two children
- B: A node with one child
- C: A node with no children
- D: A node that is always at the root
View Answer
C
Q206: What is the primary difference between a binary tree and a strictly binary tree?
- A: Binary trees do not require nodes to have two children
- B: Strictly binary trees require all non-leaf nodes to have two children
- C: Binary trees have no defined structure
- D: Strictly binary trees can have more than two children per node
View Answer
B
Q207: How is the depth of a binary tree defined?
- A: The number of nodes in the tree
- B: The level of the root node
- C: The maximum level of any leaf node
- D: The number of nodes in the longest path
View Answer
C
Q208: In the given C++ PriorityQueue implementation, what is the purpose of the sortElements() method?
- A: To remove elements from the queue
- B: To check if the queue is full
- C: To insert elements into the queue
- D: To sort the elements in ascending order
View Answer
D
Q209: What is the characteristic of a non-tree structure shown in the document?
- A: It has multiple paths to a node
- B: It has only one path to a node
- C: It has no nodes
- D: It is a linear structure
View Answer
A
Q210: What is the purpose of using a priority queue instead of a regular queue in a simulation?
- A: To handle data with varying priorities
- B: To handle data with equal priorities
- C: To process data in FIFO order
- D: To simplify data structure implementation
View Answer
A