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Doubly Circular Linked List Quiz

Linked List
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A 20-question quiz covering the structure and behavior of doubly circular linked lists, including bidirectional looping, pointer updates, insertion, deletion, and traversal logic.

20 Questions
~40 minutes
1

Question 1

What defines a doubly circular linked list?

A
Each node has prev and next pointers, and the ends loop back to each other
B
Nodes point only forward
C
Traversal ends at null
D
Pointers only form a one-node loop
2

Question 2

What does tail.next point to in a doubly circular list?

A
The head
B
null
C
The tail
D
A special null-terminator
3

Question 3

What does head.prev reference?

A
The tail
B
null
C
The middle node
D
Head always references itself
4

Question 4

Why must traversal in a circular DLL use identity checks?

A
There is no null to indicate the end
B
Nodes reorder themselves
C
Nodes lack a next pointer
D
Memory layout determines stopping point
5

Question 5

Which traversal directions are possible?

A
Both forward and backward loops
B
Forward only
C
Backward only
D
Random jumps
6

Question 6

What must be updated when inserting at the head?

A
New.prev, new.next, old head.prev, and tail.next
B
Only new.next
C
Only tail.prev
D
All nodes in the list
7

Question 7

What happens when deleting the tail?

A
The previous node becomes tail and its next links to head
B
Head becomes null
C
Cycle breaks permanently
D
Tail.next becomes null
8

Question 8

Which deletion requires checking the head pointer?

A
Deleting the current head
B
Deleting the middle node
C
Deleting beyond the tail
D
Deleting an unused pointer
9

Question 9

What happens in a one-node doubly circular list?

A
The node’s next and prev both reference itself
B
The node’s next is null
C
It automatically splits into two nodes
D
Traversal stops after one step due to null
10

Question 10

Which pointer must be updated first when deleting a middle node?

A
The previous node’s next pointer
B
Head.prev always
C
Tail.next only
D
The head pointer
11

Question 11

What does this diagram illustrate?

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

Question 12

Which node is the tail?

plaintext
[1] <-> [4] <-> [9]
       ^                  |
       |------------------|
A
9
B
1
C
4
D
None; the list is linear
13

Question 13

What happens in this pointer update?

plaintext
new.prev = tail
      new.next = head
      tail.next = new
      head.prev = new
A
Insert new node at the tail
B
Delete head
C
Break the cycle
D
Reverse the list
14

Question 14

What does this pseudocode perform?

plaintext
curr = head
      do:
          process(curr)
          curr = curr.next
      while curr != head
A
Full forward traversal of the cycle
B
Backward traversal
C
Node deletion
D
Detects null termination
15

Question 15

What issue arises if prev pointers are not updated during insertion?

A
Backward traversal becomes invalid
B
Nodes duplicate automatically
C
List stops being circular
D
Head becomes null
16

Question 16

Which deletion affects both head and tail at once?

A
Removing the only node in the list
B
Removing a middle node
C
Removing after the tail
D
Removing unused pointers
17

Question 17

What defines the flexibility of circular DLLs?

A
Bidirectional looping without null boundaries
B
Automatic sorting behavior
C
Contiguous memory layout
D
Constant-time random access
18

Question 18

Which pointer maintains continuous backward traversal?

A
prev
B
next
C
head
D
index
19

Question 19

What is required after inserting at the tail?

A
Updating both next and prev pointers to maintain the loop
B
Breaking the cycle and re-forming it
C
Traversing to head until null
D
Sorting nodes
20

Question 20

What advantage do circular DLLs offer over circular singly linked lists?

A
Efficient backward traversal
B
Lower memory usage
C
Guaranteed O(1) search
D
Self-correcting pointers

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