BudiBaduQuiziBadu

Doubly Linked List Quiz

Linked List
0 Passed
0% acceptance

A 30-question quiz exploring doubly linked list structure, node connections, pointer behavior, traversal, insertion, deletion, and edge cases.

30 Questions
~60 minutes
1

Question 1

What distinguishes a doubly linked list from a singly linked list?

A
Each node has both next and prev pointers
B
Nodes store sorted data automatically
C
Nodes hold only one pointer
D
The list always forms a loop
2

Question 2

What does the prev pointer of the head node contain?

A
null
B
The tail
C
The node after head
D
A pointer to itself
3

Question 3

Which pointer defines the final node of a doubly linked list?

A
A node whose next pointer is null
B
A node whose prev pointer is null
C
A node pointing to head
D
A node storing a special marker
4

Question 4

Which traversal direction is possible in doubly linked lists?

A
Both forward and backward
B
Forward only
C
Random jumps based on index
D
Backward only
5

Question 5

Which statement is true about memory layout?

A
Nodes do not need contiguous memory
B
Nodes must be consecutive in memory
C
Tail must be next to head
D
Prev pointers require contiguous storage
6

Question 6

What must be updated when inserting a node at the head?

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

Question 7

Which deletion is simplest in a DLL?

A
Deleting the head node
B
Deleting the tail
C
Deleting a middle node
D
Deleting a node from an array
8

Question 8

When deleting a middle node, which pointer must be updated first?

A
The prev node's next pointer
B
The head pointer
C
The tail pointer
D
The deleted node’s next pointer
9

Question 9

What is required when inserting at the tail?

A
Update old tail’s next and new node’s prev
B
Rebuild the list
C
Move head to the end
D
Delete the old tail
10

Question 10

What is a risk when modifying pointers incorrectly?

A
Breaking bidirectional structure
B
Nodes sort themselves
C
The list gains a third direction
D
Tail moves to middle
11

Question 11

What does this diagram represent?

plaintext
null <- [A] <-> [B] <-> [C] -> null
A
A doubly linked list with three nodes
B
A singly linked list
C
A circular list
D
A stack
12

Question 12

Which node is the head here?

plaintext
null <- [10] <-> [20] <-> [30] -> null
A
10
B
20
C
30
D
None; circular list
13

Question 13

What is happening in this deletion?

plaintext
[A] <-> [B] <-> [C]
             ^
           delete B
A
A’s next must point to C, and C’s prev must point to A
B
C must point to itself
C
B becomes tail
D
Head becomes null
14

Question 14

What is indicated by this break?

plaintext
[X] <-> [Y] 
            X
        (broken prev link)
A
Y cannot reach X via prev anymore
B
The list is circular
C
A new tail appears
D
Head and tail swapped
15

Question 15

What does this illustrate?

plaintext
null <- [H] <-> [M] <-> [T] -> null
               |
           insert [X] after H
A
H.next = X, X.prev = H, X.next = M, M.prev = X
B
X becomes the tail
C
All nodes reverse
D
H becomes null
16

Question 16

What does this pseudocode accomplish?

plaintext
curr = tail
      while curr:
          print(curr.value)
          curr = curr.prev
A
Backward traversal of the list
B
Forward traversal
C
Middle deletion
D
Node duplication
17

Question 17

Which scenario requires updating both head and tail?

A
Creating a single-node list
B
Deleting the middle node
C
Traversing
D
Breaking a pointer
18

Question 18

Why is deletion easier in DLL than SLL?

A
DLL nodes have prev pointers
B
DLL nodes store indexes
C
DLLs have no head
D
DLLs auto-repair
19

Question 19

Which pointer must be changed when deleting the tail?

A
The previous node’s next pointer becomes null
B
The head’s prev pointer
C
The middle node only
D
All prev pointers
20

Question 20

Which statement reflects DLL symmetry?

A
Pointers update in pairs: next and prev
B
All nodes have equal memory addresses
C
No pointers exist
D
Nodes reorder automatically
21

Question 21

Which operation is O(1) in DLLs with a tail pointer?

A
Append at tail
B
Search for value
C
Random index access
D
Traversal
22

Question 22

Which structure is maintained even after deletion?

A
Bidirectional traversal ability
B
Circular loops
C
Index-based lookup
D
Array-style positions
23

Question 23

Which issue occurs if both next and prev are not updated during insertion?

A
Structural inconsistency
B
Automatic reversal
C
Node duplication
D
Sorted ordering
24

Question 24

Why must a deletion check if the node is head?

A
Head deletion requires updating the head pointer
B
Head deletion sorts the list
C
Head never changes
D
Deleting head deletes the tail automatically
25

Question 25

What occurs when prev pointers form a loop?

A
Backward traversal becomes infinite
B
List sorts itself
C
Random access becomes possible
D
Node duplication occurs
26

Question 26

Which behavior applies to a single-node DLL?

A
Head and tail reference the same node
B
Prev pointer points to head
C
Traversal requires two steps
D
Both pointers must be non-null
27

Question 27

Which pointer allows backward traversal?

A
prev
B
next
C
head
D
index
28

Question 28

What must be done before deleting the head in a DLL?

A
Set the new head’s prev to null
B
Reset the tail
C
Traverse to the tail first
D
Delete all nodes after head
29

Question 29

What is a common advantage of DLLs?

A
Efficient deletion with direct node references
B
Minimal memory usage
C
Guaranteed sorting
D
Constant-time indexing
30

Question 30

What defines DLL structure as flexible?

A
Pointer-based linking allows inserts/deletes anywhere
B
Nodes auto-manage memory
C
Node order cannot change
D
Random access is instant

Other Quiz Categories

JavaScript
47 quizzes
Basics
Variables & Data Types
Operators & Expressions
Rust
30 quizzes
Cargo and Project Setup
Variables and Mutability
Data Types
Python
29 quizzes
Introduction & Core Fundamentals
Data Types Overview
Type Casting
Golang
29 quizzes
Basics & Syntax
Data Types & Zero Values
Operators & Expressions
C++
26 quizzes
Basics
Variables & Data Types
Operators & Expression
Java
22 quizzes
Java Basics & JVM Fundamentals
Variables, Data Types & Type Casting
Operators & Expressions
Matlab
21 quizzes
Basics & Environment
Variables and Data Type
Arrays and Matric
TypeScript
19 quizzes
Introduction and Overview
Installation and Configuration
Basic Types and Type Annotations
SQL Database
15 quizzes
Foundations and Basics
Basic Query Selection
Filter, Sort, and Alias Essentials
PHP
15 quizzes
Syntax Building Blocks
Variable Naming
Data Types Overview

QUIZZES IN Linked List

1

Introduction

50

A 50-question quiz introducing linked list fundamentals, node structures, operations, complexity, variants, traversal logic, and conceptual behavior.

2

Node Structure and Pointer Fundamentals

40

A 40-question quiz covering how linked list nodes store data and pointers, node relationships, pointer manipulation, node diagrams, memory links, and conceptual pointer mechanics.

3

Singly Linked List

30

A 30-question quiz covering singly linked list fundamentals, node linking, traversal, insertion, deletion, and pointer behavior.

4

Doubly Linked List

30

A 30-question quiz exploring doubly linked list structure, node connections, pointer behavior, traversal, insertion, deletion, and edge cases.

5

Circular Linked List

30

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

6

Doubly Circular Linked List

20

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

7

Linked List Traversal

25

A 25-question quiz about traversal patterns in linked lists, covering forward traversal, backward traversal in DLLs, circular traversal control, stopping conditions, pointer movement, and loop detection.

8

Linked List Insertion Operations

30

A 30-question quiz covering insertion at the head, insertion at the tail, and insertion at a specific position in linked lists.

9

Linked List Deletion Operations

30

A 30-question quiz covering deletion at head, deletion at tail, deletion by value, and deletion by position in linked lists.

10

Linked List Searching and Pointer Techniques

30

A 30-question quiz covering searching in linked lists, the fast–slow pointer technique, and finding the middle node.

11

Palindrome Linked List

25

A 25-question quiz covering detection of palindrome linked lists using pointers, reversal, comparison, and traversal logic.