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Linked List MCQs with Explanations

 Friends in this blog article I have find some Amazing MCQ on linked list concepts.

Linked List MCQs with Explanations


Linked List MCQs with Explanations

1. Tell which of the statement about singly linked lists is true?
a) Nodes are stored in contiguous memory locations
b) Each node contains data and a pointer to the next node
c) Nodes have pointers to both previous and next nodes
d) The last node of linked list points to the head node
Show Answer

Answer: b) Each node contains data and a pointer to the next node.

Explanation: In singly linked lists, each node holds data and a pointer to the next node only. They are not stored contiguously in memory.


2.Can you Tell the time complexity of inserting a node at the beginning of a singly linked list?
a) O(1)
b) O(n)
c) O(log n)
d) O(n log n)
Show Answer

Answer: a) O(1)

Explanation: Inserting at the head involves updating the new node's next pointer to the current head and updating the head pointer itself — a constant time operation.


3. What does each node in a doubly linked list point to?
a) Pointer to next node only
b) Pointer to previous node only
c) Pointers to both previous and next nodes
d) No pointers, just data
Show Answer

Answer: c) Pointers to both previous and next nodes.

Explanation: Doubly linked list nodes contain two pointers: one to the previous node and one to the next node.


4. What does the head pointer/reference in a linked list represent?
a) The last node in the list
b) The middle node in the list
c) The first node in the list
d) A pointer to null
Show Answer

Answer: c) The first node in the list.

Explanation: The head pointer points to the first node of the linked list.


5. What is the longest time it can take to find an item in a singly linked list?
a) O(1)
b) O(n)
c) O(log n)
d) O(n²)
Show Answer

Answer: b) O(n)

Explanation: In the worst case, you may need to traverse the entire list to find the element.



6. In a circular linked list, the last node points to linked list 
a) Null
b) The head node
c) The middle node
d) Itself
Show Answer

Answer: b) The head node.

Explanation: Circular linked lists link the last node back to the first node, forming a circle.


7. Which of the following is an incorrect operation on linked lists?
a) Traversal
b) Insertion
c) Deletion
d) Random access by index
Show Answer

Answer: d) Random access by index.

Explanation: Linked lists do not support efficient random access; access is sequential.



8. How do you find a loop in a linked list?
a) Traverse and check for null
b) Using two pointers moving at different speeds (Floyd's cycle-finding algorithm)
c) Count nodes and compare with expected
d) Use sorting
Show Answer

Answer: b) Use two pointers moving at different speeds (Floyd's cycle-finding algorithm).

Explanation: This is a standard efficient method to detect cycles.



9.which statement correctly describes how linked lists handle memory?
a) Static memory allocation
b) Dynamic memory allocation
c) Stored in CPU registers
d) Stored on disk
Show Answer

Answer: b) Dynamic memory allocation.

Explanation: Nodes are created and linked dynamically at runtime.


10.Can you tell what is the benefit of linked lists over arrays?
a) Faster access to elements
b) Dynamic size and ease of insertion/deletion
c) Use less memory
d) Simple implementation
Show Answer

Answer: b) Dynamic size and ease of insertion/deletion.

Explanation: Linked lists can grow and shrink easily without reallocating memory.



11. Can you tell which of these is NOT a type of linked list?
a) Singly linked list
b) Doubly linked list
c) Triply linked list
d) Circular linked list
Show Answer

Answer: c) Triply linked list.

Explanation: Common types are singly, doubly, and circular linked lists.


12. In which case is a doubly linked list preferred over singly linked list?
a) When you need to traverse only in one direction
b) When you want to traverse both forward and backward
c) When memory usage is a big concern
d) When random access is needed
Show Answer

Answer: b) When you want to traverse both forward and backward.


Read more How to start Dsa for beginners

Frequently Asked Questions

What are the four types of linked lists?

There are four types of linked lists:

  1. Singly Linked List: A list where each node points to the next node.
  2. Doubly Linked List: A list where each node points to both the next and previous nodes.
  3. Circular Linked List: A list where the last node points to the first node.
  4. Circular Doubly Linked List: A combination of doubly linked list and circular linked list.

What is a Doubly Linked List?

A doubly linked list is a linked list where each node has three parts:

  • Data
  • Next Pointer (points to the next node)
  • Previous Pointer (points to the previous node)

This structure allows traversal in both directions (forward and backward).

What is the time complexity of Linked List operations?

The time complexity for different linked list operations is:

  • Insertion at the beginning: O(1)
  • Insertion at the end: O(n) for singly linked, O(1) for doubly linked with tail pointer
  • Insertion at a specific position: O(n)
  • Deletion from the beginning: O(1)
  • Deletion from the end: O(n) for singly linked, O(1) for doubly linked with tail pointer
  • Search: O(n)
  • Access: O(n)

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