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Circular Linked List Quiz

Linked List
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A 30-question quiz covering circular linked list structure, node linking, traversal challenges, insertion, deletion, and behavior of circular pointer loops.

30 Questions
~60 minutes
1

Question 1

What defines a circular linked list?

A
The tail points back to the head
B
The head has no next pointer
C
Nodes store both next and prev pointers
D
Nodes must be in sorted order
2

Question 2

What pointer value does the tail node contain in a circular list?

A
A reference to the head
B
null
C
A reference to itself only
D
A special termination marker
3

Question 3

Which traversal characteristic is unique to circular lists?

A
Traversal must detect completion by identity, not null
B
Traversal always stops at null
C
Backward traversal is required
D
Traversal requires index tracking
4

Question 4

Why must circular lists avoid naive while loops?

A
They may produce infinite loops
B
They delete nodes automatically
C
They stop too early
D
They require sorting first
5

Question 5

What is true about memory layout in circular lists?

A
Nodes do not require consecutive memory
B
Nodes must be contiguous in memory
C
Tail must be next to head physically
D
Memory layout determines loop behavior
6

Question 6

What happens when inserting at the head of a circular list?

A
Tail.next must be updated to point to the new head
B
The list becomes singly linked
C
Null must be updated
D
Only head.next changes
7

Question 7

Which deletion requires special handling?

A
Deleting the head
B
Deleting the middle node
C
Deleting the last node in a normal list
D
Deleting after the tail
8

Question 8

What defines an empty circular list?

A
Head is null
B
Tail loops to itself
C
Nodes link backward only
D
Head equals tail always
9

Question 9

Which error occurs if a node’s next pointer is lost?

A
The cycle breaks or becomes unreachable
B
Nodes automatically reconnect
C
Traversal becomes index-based
D
Head requires sorting
10

Question 10

Which operation becomes simpler with circular lists?

A
Rotating the list
B
Random access
C
Constant-time search
D
Memory compaction
11

Question 11

What does this diagram depict?

plaintext
[A] -> [B] -> [C]
        ^           |
        |-----------|
A
A circular linked list of three nodes
B
A doubly linked list
C
A normal singly linked list
D
A tree structure
12

Question 12

Which node is the tail?

plaintext
[1] -> [5] -> [9]
        ^          |
        |----------|
A
9
B
1
C
5
D
None; it is linear
13

Question 13

What is illustrated here?

plaintext
[X] -> [Y] -> [Z]
        ^        |
        |--------|
A
Z’s next pointer links back to X
B
A reversed list
C
A corrupted singly linked list
D
A structure with missing head
14

Question 14

What does this pointer update accomplish?

plaintext
new.next = head
      tail.next = new
A
Insert new node at the head
B
Insert at the tail only
C
Delete the head
D
Break the circular loop
15

Question 15

What happens in this deletion?

plaintext
prev.next = curr.next
      if curr == head:
          head = curr.next
A
Delete current node and update head if needed
B
Reverse the list
C
Delete the tail always
D
Insert at head
16

Question 16

What does this traversal ensure?

plaintext
curr = head
      do:
          process(curr)
          curr = curr.next
      while curr != head
A
It processes each node exactly once
B
It loops forever
C
It processes no nodes
D
It requires null termination
17

Question 17

Which structure does a single-node circular list represent?

A
A node whose next pointer references itself
B
A node pointing to null
C
Two disconnected nodes
D
A doubly linked structure
18

Question 18

Which pointer must update when deleting the tail?

A
The new tail’s next must point to head
B
Head’s next must become null
C
The cycle must be broken permanently
D
All nodes require relinking
19

Question 19

What defines a safe stopping condition during traversal?

A
Checking when curr equals head again
B
Checking for null
C
Checking for negative values
D
Checking memory address order
20

Question 20

What is the biggest risk of careless pointer updates?

A
Creating unintended loops inside the loop
B
Sorting the list
C
Nodes duplicating
D
Head becomes array
21

Question 21

Which operation benefits from circular structure?

A
Round-robin processing
B
Binary search
C
Constant-time index access
D
Memory compaction
22

Question 22

What happens if head is deleted in a list with more than one node?

A
The next node becomes head and tail.next must adjust
B
Tail becomes null
C
The list becomes linear
D
Only head.next changes
23

Question 23

What represents a traversal error?

A
Failure to detect head re-entry
B
Using do-while loops
C
Starting at head
D
Processing tail
24

Question 24

Which modification breaks circular structure?

A
Setting tail.next to null
B
Inserting at head
C
Traversing backward
D
Reading values
25

Question 25

Why is a circular list good for continuous iteration?

A
Pointers always cycle back to the start
B
Nodes shift themselves automatically
C
Memory is contiguous
D
Traversal requires only constant time
26

Question 26

What happens in a one-node circular list during deletion?

A
Head becomes null
B
Tail remains unchanged
C
Loop expands automatically
D
Node points to itself still
27

Question 27

Which structural property remains the same even after several insertions?

A
Tail.next always points to head
B
Head.prev exists
C
Nodes remain in memory order
D
Sorted order persists
28

Question 28

Which issue arises from incorrect tail updates?

A
Cycle breaks or misaligns
B
List becomes doubly linked
C
All nodes reverse automatically
D
Head becomes null
29

Question 29

Which traversal pattern is typical in circular lists?

A
Starting at head and looping until head reappears
B
Ending when next equals null
C
Random jumps via pointer arrays
D
Backward sweeping using prev
30

Question 30

What advantage do circular lists provide over linear ones?

A
Efficient continuous cycling
B
Constant-time search
C
Guaranteed balanced structure
D
Automatic memory compaction

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