Data Structures MCQs with Answers
Practice important Data Structures MCQs with answers and explanations.
Multiple Choice Questions
Q61: How can a linked list be traversed in the given code?
- A: Using a for loop
- B: Using a while loop
- C: By calling the next() method repeatedly
- D: By calling the add() method repeatedly
View Answer
C
Q62: What happens if currentNode is NULL in the next() method?
- A: It throws an exception
- B: It returns false
- C: It moves to the head node
- D: It moves to the last node
View Answer
B
Q63: What does the start() method in the linked list do?
- A: Assigns NULL to headNode
- B: Positions currentNode at start
- C: Adds a new node at the start
- D: Deletes the first node
View Answer
B
Q64: Which pointer in a linked list cannot move behind headNode in a singly-linked list?
- A: lastCurrentNode
- B: currentNode
- C: Both lastCurrentNode and currentNode
- D: None of the above
View Answer
C
Q65: What does the remove() method in a linked list do?
- A: Removes the last node
- B: Removes the node at the start
- C: Removes the node pointed by currentNode
- D: Removes the node pointed by headNode
View Answer
C
Q66: In the remove() method, what happens after executing delete currentNode;?
- A: Node is added to the list
- B: Memory is released to the system
- C: Node is set to NULL
- D: Nothing happens
View Answer
B
Q67: What is the return type of the length() method in the linked list?
- A: void
- B: int
- C: Node*
- D: bool
View Answer
B
Q68: What is the purpose of the lastCurrentNode->setNext(currentNode->getNext()) statement?
- A: Connects currentNode to lastCurrentNode
- B: Deletes currentNode
- C: Bypasses the node pointed by currentNode
- D: Initializes currentNode
View Answer
C
Q69: Which of the following operations is a one-step operation in a linked list?
- A: Add
- B: Remove
- C: Find
- D: Back
View Answer
A
Q70: What is the worst-case scenario in the find method in a linked list?
- A: Finding x at the start
- B: Finding x at the end
- C: Not finding x in the list
- D: Finding x in the middle
View Answer
C