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Linked List Introduction Quiz

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

50 Questions
~100 minutes
1

Question 1

What is a linked list?

A
A sequence of nodes connected by pointers
B
A contiguous block of fixed-size memory
C
A table of sorted keys
D
A graph with weighted edges
2

Question 2

What does a typical linked list node contain?

A
A value and a reference to another node
B
Only a numeric index
C
An automatic memory allocator
D
Only metadata
3

Question 3

What is the first node in a linked list called?

A
Head
B
Root
C
Top
D
Base
4

Question 4

What is the primary advantage of a linked list over an array?

A
Efficient insertions and deletions
B
Instant random access
C
Guaranteed compact memory use
D
Simple pointer-free design
5

Question 5

Which disadvantage applies to linked lists?

A
Slower random access
B
Impossible to expand
C
Require fixed-size elements
D
Cannot remove nodes
6

Question 6

What characterizes a singly linked list?

A
Each node has one pointer to the next node
B
Each node has pointers to both next and previous
C
Nodes are arranged in a circle
D
Nodes store indexed positions
7

Question 7

What characterizes a doubly linked list?

A
Each node has both next and previous pointers
B
Nodes appear only in sorted order
C
Nodes connect in a loop
D
Nodes store only one pointer
8

Question 8

What defines a circular linked list?

A
The last node's next pointer links back to the head
B
Nodes form a binary branching structure
C
Nodes maintain indices for random access
D
Nodes cannot be deleted
9

Question 9

What is a drawback of doubly linked lists?

A
Extra memory for storing the previous pointer
B
Inability to delete nodes
C
Must be sorted
D
Cannot store values
10

Question 10

Which list type enables traversing backward?

A
Doubly linked list
B
Singly linked list
C
Circular singly list (forward only)
D
Any list with one pointer
11

Question 11

In a singly linked list, what does the head's next pointer reference?

A
The second node
B
The tail
C
A random node
D
The head itself
12

Question 12

What is the typical value of the next pointer in a non-circular list's last node?

A
null
B
The head node
C
The middle node
D
A random memory address
13

Question 13

What must be updated when removing the first node?

A
The head reference
B
All node pointers
C
The entire list
D
The node values only
14

Question 14

What does this pseudocode do?

plaintext
current = head
  while current != null:
      visit(current.value)
      current = current.next
A
Traverses the list from head to end
B
Deletes nodes
C
Reverses the list
D
Creates new nodes
15

Question 15

What operation is shown?

plaintext
newNode.next = head
  head = newNode
A
Insert at the beginning
B
Insert at the end
C
Delete last node
D
Reverse entire list
16

Question 16

What does this pseudocode accomplish?

plaintext
if head == null: return
  head = head.next
A
Delete the first node
B
Delete the last node
C
Insert after head
D
Reverse the list
17

Question 17

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

A
O(n)
B
O(1)
C
O(log n)
D
O(n log n)
18

Question 18

What is the time complexity of inserting at the head?

A
O(1)
B
O(n)
C
O(n^2)
D
O(log n)
19

Question 19

Which operation has O(n) time in singly linked lists?

A
Insertion at the tail (without tail pointer)
B
Reading head value
C
Checking if list is empty
D
Assigning head to null
20

Question 20

Which list has the highest overhead per node?

A
Doubly linked list
B
Singly linked list
C
Circular singly list
D
All equal
21

Question 21

Which step is necessary when inserting after a target node in SLL?

A
Set newNode.next to target.next
B
Set head to newNode
C
Update tail only
D
Reset entire list
22

Question 22

Which must be updated when deleting a middle node?

A
The previous node's next pointer
B
The head pointer only
C
Every node in the list
D
The tail pointer only
23

Question 23

Which is true for tail insertion in DLL?

A
prev pointer of new node must reference the old tail
B
Only next pointer is updated
C
Node order must be reversed
D
Head must be reassigned
24

Question 24

What is required to reverse a singly linked list?

A
Reassign each node's next pointer
B
Swap data values only
C
Remove all nodes and rebuild
D
Use an external index map
25

Question 25

What does this pseudocode compute?

javascript
count = 0
  current = head
  while current != null:
      count++
      current = current.next
A
Length of the list
B
Sum of values
C
Pointer reversal
D
Cycle detection
26

Question 26

What is this operation?

javascript
current.next = current.next.next
A
Delete the node after current
B
Insert before current
C
Break the list entirely
D
Make list circular
27

Question 27

What is this pseudocode describing?

javascript
prev = null
  current = head
  while current != null:
      nextNode = current.next
      current.next = prev
      prev = current
      current = nextNode
  head = prev
A
Reversing a singly linked list
B
Sorting a list
C
Deleting all nodes
D
Detecting duplicates
28

Question 28

What happens if tail pointer is not updated after tail deletion?

A
The tail reference becomes incorrect
B
The list becomes circular
C
All nodes become inaccessible
D
The head is removed
29

Question 29

Which pointer update is essential when converting SLL to CLL?

A
Point the last node's next pointer to the head
B
Point head to null
C
Delete all nodes
D
Double the list length
30

Question 30

What does a tail pointer help optimize?

A
O(1) insertion at end
B
O(1) deletion at end
C
Random access
D
Memory compaction
31

Question 31

Which scenario favors a linked list?

A
Frequent insertions and deletions
B
Frequent random access lookups
C
Fixed-size block needed
D
Index-based quick search
32

Question 32

Which structure is more memory-efficient for large static data?

A
Array
B
Singly linked list
C
Circular list
D
Doubly linked list
33

Question 33

What is true about empty lists?

A
Head is null
B
Head references a dummy node
C
Traversal starts at tail
D
All next pointers are valid
34

Question 34

What is the minimum number of pointers in DLL node?

A
Two
B
One
C
Zero
D
Three
35

Question 35

What is common when deleting a node in a doubly linked list?

A
Updating both next and prev pointers
B
Updating only next pointer
C
Rebuilding the chain
D
Deleting the head always
36

Question 36

In which list type can a single-node list also be circular?

A
Circular linked list
B
Singly linked list
C
Doubly linked list
D
Sorted list
37

Question 37

When is pointer assignment order crucial?

A
While inserting or deleting nodes to avoid losing references
B
While reading node values
C
While computing list length
D
While checking emptiness
38

Question 38

Which scenario commonly uses linked lists?

A
Implementing queues or stacks dynamically
B
Fast random access
C
Dense mathematical matrix storage
D
Sorting with direct indexing
39

Question 39

Which feature helps avoid memory reallocation?

A
Node-by-node dynamic growth
B
Static array sizing
C
Index tables
D
Pointer compression
40

Question 40

Which is a common use of circular lists?

A
Round-robin scheduling
B
Binary search
C
Matrix decomposition
D
Random-access caching
41

Question 41

What is a sentinel node?

A
A special node simplifying boundary conditions
B
The last node of list
C
A temporary node that stores random values
D
A node that tracks memory use
42

Question 42

Which algorithm is easier with DLLs than SLLs?

A
Traversing backward
B
Counting nodes
C
Finding head
D
Checking empty list
43

Question 43

What structure results when all nodes have next pointer referencing itself?

A
A set of single-node circular lists
B
A standard linear list
C
A doubly linked list
D
A sorted list
44

Question 44

What prevents infinite loops during traversal?

A
Checking for null or detecting circles
B
Swapping values
C
Counting backwards
D
Copying nodes
45

Question 45

Which is required when merging two SLLs?

A
Correctly linking the tail of first to head of second
B
Reallocating all nodes
C
Using a doubly linked structure
D
Removing head nodes
46

Question 46

Which problem do linked lists help solve?

A
Large unpredictable insertions
B
Fast random access
C
Constant-time binary search
D
Memory fragmentation elimination
47

Question 47

What is essential for cycle detection?

A
Tracking visited pointers or using fast/slow pointers
B
Swapping node positions
C
Sorting the list first
D
Adding dummy nodes
48

Question 48

What happens when the head pointer is lost accidentally?

A
The entire list becomes unreachable
B
Tail becomes the new head
C
Pointers automatically restore themselves
D
Traversal becomes faster
49

Question 49

Which is a characteristic of linked lists?

A
Elements may be scattered across memory
B
Elements must be adjacent
C
Elements must be indexed
D
Elements cannot be deleted
50

Question 50

Overall, linked lists emphasize:

A
Flexible structure and efficient insertion/deletion
B
Fast indexing and contiguous storage
C
Binary search performance
D
Fixed-size memory usage

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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.