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Linked List Node Structure and Pointer Fundamentals Quiz

Linked List
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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.

40 Questions
~80 minutes
1

Question 1

What two main components does a typical linked list node contain?

A
A data field and a pointer to another node
B
A data field and an array index
C
A pointer and a size indicator
D
Only metadata
2

Question 2

What is the pointer in a node typically used for?

A
Linking the node to the next node
B
Sorting values
C
Counting nodes
D
Storing the list length
3

Question 3

What does a null pointer typically represent in a node?

A
End of the list
B
Start of the list
C
Middle of the list
D
Sorted boundary
4

Question 4

Why don't linked list nodes need to be stored in contiguous memory?

A
Pointers explicitly connect nodes regardless of location
B
All nodes share the same address
C
They use fixed memory blocks
D
Memory allocators enforce adjacency
5

Question 5

What is a node's data field responsible for?

A
Storing the value contained by the node
B
Storing the memory layout of the list
C
Storing a reference to head
D
Sorting neighboring nodes
6

Question 6

What does the following diagram represent?

plaintext
[5] -> [8] -> [12] -> null
A
A chain of three nodes ending at null
B
A circular list
C
A reversed array
D
A stack diagram
7

Question 7

In the following diagram, which node is the tail?

plaintext
[2] -> [7] -> [9] -> null
A
The node containing 9
B
The node containing 2
C
The node containing 7
D
None; this is circular
8

Question 8

What does the pointer in this node diagram indicate?

plaintext
[A] --> [B]
A
Node A links to node B
B
Node B links to node A
C
A circular list
D
A disconnected node
9

Question 9

What does this represent?

plaintext
[3|*]   [*] -> null
         \   /
          [7]
A
A node pointed to by two different nodes
B
A circular list
C
A sorted tree
D
A binary search structure
10

Question 10

In this diagram, what has happened?

plaintext
[A] -> [B] -> [C]
              ^
              |
            (lost link)
A
Node B’s previous link was lost, risking orphaned nodes
B
A new head was created
C
The list was reversed
D
All nodes were deleted
11

Question 11

What must be updated when inserting a node between two existing nodes?

A
Both surrounding node pointers
B
Only the head
C
Only the new node's data
D
The list length pointer
12

Question 12

What happens if a pointer incorrectly skips a node?

A
The skipped node becomes unreachable
B
The list reverses
C
The node sorts itself
D
The head is replaced
13

Question 13

Why is pointer integrity crucial in linked lists?

A
A broken pointer can make nodes permanently inaccessible
B
Pointers sort the data
C
Pointers compress memory
D
Pointers eliminate null storage
14

Question 14

What does adjusting a pointer typically achieve?

A
Changes which node another node references
B
Moves memory locations of nodes
C
Sorts the list
D
Converts the list to a tree
15

Question 15

What does a node with both next and previous pointers represent?

A
A doubly linked list node
B
A circular singly node
C
A stack element
D
A tree leaf
16

Question 16

What does this depict?

plaintext
HEAD
        |
       [10] -> [22] -> [31] -> null
A
A simple singly linked list
B
A doubly linked list
C
A circular list
D
A binary structure
17

Question 17

Which node does the pointer reference here?

plaintext
[X] --> [Y] --> [Z]
A
X points to Y
B
Y points to X
C
Z points to X
D
They form a circle
18

Question 18

What is missing in this diagram?

plaintext
[value] ->
A
The node it should point to
B
The node's value
C
The head reference
D
The tail pointer
19

Question 19

What does this represent?

plaintext
[5] <--> [9] <--> [14]
A
A doubly linked list
B
A singly linked list
C
A circular list
D
A stack
20

Question 20

Which pointer is broken here?

plaintext
[A] -> null    [B] -> [C]
A
A pointer should link A to B
B
C should point to A
C
B should point to itself
D
A should store two pointers
21

Question 21

What is required to safely remove a node in SLL?

A
Redirect the previous node’s pointer
B
Move all nodes in memory
C
Modify the head always
D
Allocate extra nodes
22

Question 22

What happens if head pointer is lost?

A
The entire list becomes unreachable
B
Tail becomes new head
C
List self-repairs
D
Nodes merge automatically
23

Question 23

Which node is affected when updating next pointer improperly?

A
The node that originally followed it
B
Head only
C
Tail always
D
None; pointers auto-correct
24

Question 24

What must be done to avoid losing track of a node during deletion?

A
Store its next pointer before reassigning
B
Delete head first
C
Reverse the list
D
Make list circular
25

Question 25

What happens if two nodes point to the same successor?

A
The two nodes share a common next node
B
List becomes circular
C
The successor is duplicated
D
The list is sorted
26

Question 26

What operation is this preparing to perform?

plaintext
temp = B.next
      B.next = C
A
Redirect B to point to C
B
Delete B
C
Move node C before B
D
Make B the new head
27

Question 27

What does this represent?

plaintext
[1] -> [2] -> [3]
          X
      (Broken link)
A
Pointer from node 1 no longer reaches node 2
B
Tail was moved to head
C
Circular behavior
D
A sorted array
28

Question 28

What is shown here?

plaintext
[A] -> [B]
       [A] -> [C]
A
A is pointing to two different nodes
B
B points to A
C
Circular list
D
Identical nodes
29

Question 29

What does this indicate?

plaintext
[A] <--- [B] ---> [C]
A
B has two outgoing pointers
B
This is a proper DLL
C
Circular list
D
Tree branching
30

Question 30

What does the following show?

plaintext
HEAD -> [7] -> [9] -> null
              |
            (lost pointer)
A
Node 7 had an additional pointer that is now lost
B
The list is circular
C
Head is missing
D
Node 9 points backward
31

Question 31

What is important when replacing a node's data but not its pointer?

A
List structure remains unchanged
B
Pointer must be updated
C
Tail shifts automatically
D
Head resets
32

Question 32

What does pointer reassignment NOT do?

A
Move nodes in memory
B
Rearrange list connections
C
Skip nodes
D
Connect nodes differently
33

Question 33

Which structure results when every node's pointer references itself?

A
Single-node circular loops
B
One complete circle
C
A standard SLL
D
A DLL
34

Question 34

What risk occurs if next pointer is overwritten before saving its value?

A
The rest of the list becomes unreachable
B
The list sorts itself
C
Head is deleted
D
A new tail is created
35

Question 35

Which pointer correctly identifies list termination?

A
A next pointer set to null
B
A pointer looping back to head
C
A pointer storing node size
D
A pointer storing index
36

Question 36

Which node acts as head?

plaintext
[H] -> [2] -> [3] -> null
A
H
B
2
C
3
D
null
37

Question 37

What has happened here?

plaintext
[A] -> [B]
             |
           (loop)
             |
            [A]
A
A cycle was created between A and B
B
The list was reversed
C
All nodes were deleted
D
List became doubly linked
38

Question 38

What is needed to traverse a list safely?

A
A stopping condition such as null or visited detection
B
Bidirectional pointers
C
Equal pointer values
D
Sorted data
39

Question 39

Which part of a node determines the next node in sequence?

A
Pointer field
B
Data field
C
List length value
D
Node index
40

Question 40

Overall, what defines a node's role in linked lists?

A
Storing data and defining connectivity via pointers
B
Providing fixed-size indexed storage
C
Sorting data automatically
D
Guaranteeing contiguous memory

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