Linked Lists In Data Structures — Part 1 MCQs with Explanations

O(1) is the correct answer to “What is the time complexity of inserting an element at the beginning of a linked list”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

Memory overhead is the correct answer to “Which of the following is a disadvantage of linked lists compared to arrays”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

A list where the last node points to the first node is the correct answer to “What is a circular linked list”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

Iterating through the list is the correct answer to “How do you find the length of a linked list”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

O(1) is the correct answer to “What is the time complexity of deleting an element from a singly linked list if the node is known”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

Data and a pointer to the next node is the correct answer to “In a singly linked list, what does each node contain”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

Doubly linked list is the correct answer to “Which type of linked list allows for traversal in both directions”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

Null reference is the correct answer to “What happens if you try to access the next pointer of the last node in a singly linked list”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

Traverse to the last node and update its next pointer is the correct answer to “How do you insert a new node at the end of a linked list”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

O(n) is the correct answer to “What is the time complexity of searching for an element in a linked list”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

Insertion at the beginning is the correct answer to “Which of the following operations is the most efficient in a linked list compared to an array”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

Update the previous node's next pointer and the next node's previous pointer is the correct answer to “How do you remove a node from a doubly linked list”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

A special node that simplifies edge cases is the correct answer to “What is a sentinel node in the context of linked lists”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

O(n) is the correct answer to “What is the space complexity of a linked list with n elements”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

Both A and B is the correct answer to “Which of the following is an application of linked lists”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

Using two pointers (Floyd's Cycle-Finding Algorithm) is the correct answer to “How do you detect a cycle in a linked list”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

A linked list with nodes in reverse order is the correct answer to “What is the result of reversing a singly linked list”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

Its next pointer is null is the correct answer to “In a doubly linked list, which of the following is true about the last node”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

O(n) is the correct answer to “What is the time complexity of merging two sorted linked lists into a single sorted linked list”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

O(1) is the correct answer to “What is the best case time complexity for inserting an element in a sorted linked list”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

Using a singly linked list is the correct answer to “How do you implement a stack using a linked list”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

They require more memory is the correct answer to “Which of the following is a disadvantage of doubly linked lists compared to singly linked lists”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

Copy the data from the next node to the current node and delete the next node is the correct answer to “How do you delete a node from a linked list, given only a pointer to that node”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

When you need dynamic resizing is the correct answer to “In which of the following scenarios is a linked list preferable to an array”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

O(n) is the correct answer to “What is the time complexity of finding the middle element in a singly linked list”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

Using any of the above is the correct answer to “How do you implement a queue using a linked list”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

The previous node's next pointer is set to null is the correct answer to “What happens when you try to delete the last node in a singly linked list”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

It is null if the list is empty is the correct answer to “Which of the following is true about the head pointer in a linked list”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

O(n) is the correct answer to “What is the time complexity for accessing the last element in a singly linked list”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

Indexed linked list is the correct answer to “Which of the following is NOT a type of linked list”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

Swap the pointers in each node is the correct answer to “How can you reverse a doubly linked list”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

Implementing a queue is the correct answer to “In which scenario is a circular linked list particularly useful”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

To simplify boundary conditions is the correct answer to “What is the primary reason to use a sentinel node in linked lists”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

Traverse the list and check order is the correct answer to “How do you detect if a linked list is sorted”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

A merged unsorted linked list is the correct answer to “What is the result of merging two unsorted linked lists”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

Traversing the list is the correct answer to “Which of the following operations requires O(n) time in a doubly linked list”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

Using a doubly linked list is the correct answer to “How do you implement a priority queue using a linked list”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

Through the next pointer of the first node is the correct answer to “In a circular doubly linked list, how is the last node connected to the first node”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

The node remains in the list is the correct answer to “What happens if you forget to update the next pointer of a node when deleting it in a singly linked list”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.

A linked list with multiple levels of nodes is the correct answer to “Which of the following correctly describes a skip list”. This question is standard in competitive examination syllabi for Linked Lists In Data Structures.