Doubly Linked List Quiz Online Practice Test

1. Which of the following statements about a doubly linked list is incorrect?

It allows navigation in both directions

It consumes more memory compared to a singly linked list

Insertion and deletion operations are generally slower

Implementing a doubly linked list is simpler than a singly linked list

2. What defines a memory-efficient doubly linked list?

Each node contains only one pointer to enable bidirectional traversal

The list includes breakpoints to accelerate traversal

An auxiliary singly linked list assists in navigating the doubly linked list

A doubly linked list that utilizes the bitwise AND operator for address storage

3. How is the pointer difference computed in a memory-efficient doubly linked list?

Head XOR Tail

Pointer to the previous node XOR Pointer to the next node

Pointer to the previous node minus Pointer to the next node

Pointer to the next node minus Pointer to the previous node

4. What is the time complexity in the worst-case scenario for adding a node to a doubly linked list?

O(n log n)

O(log n)

O(n)

O(1)

5. In a doubly linked list, how can traversal be performed?

Only forward

Only backward

In both forward and backward directions

In a circular manner

6. Which function is used to dynamically allocate memory to a data structure during program execution?

`malloc()`

`calloc()`

`realloc()`

All of the above

7. Which operation is more efficiently executed by a doubly linked list compared to a singly linked list?

Deleting a node when its location is known

Searching an unsorted list for a specific item

Reversing nodes after a specified position

Traversing the list to process each node

8. What defines a memory-efficient doubly linked list?

Each node has a single pointer to facilitate bidirectional traversal

The list includes breakpoints to speed up traversal

An auxiliary singly linked list assists in traversing the doubly linked list

A doubly linked list that utilizes bitwise XOR to store addresses

9. Which of the following statements about a doubly linked list is incorrect?

It allows navigation in both directions

It consumes more space compared to a singly linked list

Insertion and deletion of nodes are slightly slower

Implementing a doubly linked list is simpler than a singly linked list

10. What is the time complexity of the most efficient algorithm for reversing a doubly linked list?

O(n)

O(log n)

O(1)

O(n²)

11. In a doubly linked list, how many pointers are modified during an insertion operation?

Depends on the position of the node being inserted

12. In the provided code snippet for deleting the rightmost node of a doubly linked list, what is the missing statement?

R = R → lptr ;

?

free (R)

free (R → rptr)

free (R → lptr)

None of these

Test Name:	Doubly Linked List Quiz
Subject Category:	Computer Science
Test Type:	Multiple Choice Questions
Total Score / Questions:	12 / 12
Time Allowed:	10 Min
Who Should Practice this Test:	Students, job seekers, or professionals preparing for competitive exams and interviews.

Doubly Linked List MCQ Quiz Online Practice Test