# Circular linked list MCQs

What is a circular linked list?

a) A list where each node points to the next node

b) A list where each node points to the previous node

c) A list where the last node points back to the first node

d) A list where nodes are linked in a non-linear order

Answer: c) A list where the last node points back to the first node

What is the key difference between a circular linked list and a singly linked list?

a) A circular linked list has nodes pointing to both the next and previous nodes

b) A circular linked list has the last node pointing to the first node

c) A singly linked list allows traversal in both directions

d) A singly linked list has nodes linked in a non-linear order

Answer: b) A circular linked list has the last node pointing to the first node

What is the time complexity of inserting an element at the beginning of a circular linked list?

a) O(1)

b) O(n)

c) O(log n)

d) O(n log n)

Answer: a) O(1)

Which of the following operations requires traversal in a circular linked list?

a) Inserting at the beginning

b) Deleting from the beginning

c) Accessing the last element

d) Accessing the first element

Answer: c) Accessing the last element

What is the time complexity of deleting the first element of a circular linked list?

a) O(1)

b) O(n)

c) O(log n)

d) O(n log n)

Answer: a) O(1)

In a circular linked list, each node contains:

a) A data part and a pointer to the next node

b) A data part and a pointer to the previous node

c) A data part and pointers to both the previous and next nodes

d) Only a data part

Answer: a) A data part and a pointer to the next node

How do you traverse a circular linked list?

a) By following the pointers from one node to the next until you return to the starting node

b) By using an index

c) By accessing elements directly

d) By using a stack

Answer: a) By following the pointers from one node to the next until you return to the starting node

Which of the following is the correct way to delete a node after a given node in a circular linked list?

a) Adjust the pointer of the given node to skip the next node

b) Adjust the pointer of the next node to point to the given node

c) Delete the given node

d) None of the above

Answer: a) Adjust the pointer of the given node to skip the next node

What is the time complexity of searching for an element in a circular linked list?

a) O(1)

b) O(n)

c) O(log n)

d) O(n log n)

Answer: b) O(n)

How do you insert a new node after a given node in a circular linked list?

a) Set the new node’s pointer to the next node, then adjust the given node’s pointer to the new node

b) Set the given node’s pointer to the new node, then set the new node’s pointer to the next node

c) Set the new node’s pointer to the previous node

d) Set the new node’s pointer to the first node

Answer: a) Set the new node’s pointer to the next node, then adjust the given node’s pointer to the new node

Which of the following is true about the head node in a circular linked list?

a) It contains the largest value in the list

b) It points to the first node of the list

c) It points to the last node of the list

d) It is always null

Answer: b) It points to the first node of the list

What is the time complexity of inserting an element at the end of a circular linked list if the tail pointer is maintained?

a) O(1)

b) O(n)

c) O(log n)

d) O(n log n)

Answer: a) O(1)

What is the key advantage of using a circular linked list over a singly linked list?

a) It requires less memory

b) It allows traversal starting from any node

c) It is easier to implement

d) It has faster access to elements

Answer: b) It allows traversal starting from any node

Which of the following operations is possible with a circular linked list but not with a singly linked list?

a) Insertion at the beginning

b) Deletion from the beginning

c) Traversing in reverse order

d) Traversing starting from any node

Answer: d) Traversing starting from any node

What is the time complexity of accessing the nth element in a circular linked list?

a) O(1)

b) O(n)

c) O(log n)

d) O(n log n)

Answer: b) O(n)

Which of the following statements is true about circular linked lists?

a) They can be traversed in both directions

b) They use more memory than doubly linked lists

c) They allow efficient insertion and deletion from both ends

d) They allow efficient traversal starting from any node

Answer: d) They allow efficient traversal starting from any node

How do you find the length of a circular linked list?

a) By traversing the list and counting the nodes until you return to the starting node

b) By accessing the length property

c) By using a counter variable during insertion and deletion

d) Both a and c

Answer: d) Both a and c

In a circular linked list, what is the term used for the last node?

a) Head

b) Tail

c) End

d) Final

Answer: b) Tail

What happens if you try to delete a node from an empty circular linked list?

a) The list becomes undefined

b) The list becomes null

c) An error occurs

d) Nothing happens

Answer: c) An error occurs

Which of the following best describes a node in a circular linked list?

a) It contains a value and two pointers

b) It contains a value and a pointer to the next node

c) It contains only a value

d) It contains a value and a pointer to the previous node

Answer: b) It contains a value and a pointer to the next node

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