Data Structures MCQs with Answers
Practice important Data Structures MCQs with answers and explanations.
Multiple Choice Questions
Q281: What is indicated by a NULL return from the findMin method?
- A: The tree is empty
- B: The node is the maximum node
- C: The node is the root
- D: The tree is not fully traversed
View Answer
A
Q282: What is the main advantage of using a template class for the BinarySearchTree?
- A: It restricts the data type to integers
- B: It allows the tree to store multiple data types
- C: It simplifies the implementation
- D: It avoids memory allocation issues
View Answer
B
Q283: What does the elementAt method in the BST class do?
- A: Returns the element of a node
- B: Sets the element of a node
- C: Finds the minimum element
- D: Deletes a node from the tree
View Answer
A
Q284: What does the printInorder method do in the BST?
- A: Prints nodes in pre-order
- B: Prints nodes in post-order
- C: Prints nodes in in-order traversal
- D: Prints nodes in level-order
View Answer
C
Q285: How does the remove method handle a node with two children in its implementation?
- A: By replacing it with the maximum node in the left subtree
- B: By replacing it with the inorder predecessor
- C: By deleting the node directly
- D: By copying the node value to the parent
View Answer
B
Q286: What does the findMax method return?
- A: The maximum value in the tree
- B: The minimum value in the tree
- C: The root node
- D: The inorder successor
View Answer
A
Q287: What does the BinarySearchTree class's findMin() method return?
- A: The largest item in the tree
- B: The smallest item in the tree
- C: A boolean indicating if the tree is empty
- D: The root node of the tree
View Answer
B
Q288: In the BinarySearchTree implementation, what happens when remove() is called on a node with two children?
- A: The node is removed without any changes
- B: The node is replaced with its parent
- C: The node is replaced with the smallest item in its right subtree
- D: The node is replaced with the largest item in its left subtree
View Answer
C
Q289: Which of the following is true about the insert() method in the BinarySearchTree class?
- A: It allows duplicate entries
- B: It ignores duplicate entries
- C: It replaces existing entries with new ones
- D: It always inserts at the root node
View Answer
B
Q290: What does the makeEmpty() method do in the BinarySearchTree class?
- A: Prints all elements in the tree
- B: Returns the root node of the tree
- C: Deletes all nodes and makes the tree empty
- D: Finds the maximum element in the tree
View Answer
C