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Linked List Deletion Operations Quiz

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

30 Questions
~60 minutes
1

Question 1

What happens during deletion at the head in a singly linked list?

A
The head pointer moves to head.next
B
The list must be reversed first
C
Tail becomes the new head
D
All nodes shift positions
2

Question 2

What must be checked before deleting the head?

A
Whether the list is empty
B
Whether head equals tail
C
Whether values are sorted
D
Whether duplicates exist
3

Question 3

What happens if the list has only one node and the head is deleted?

A
The list becomes empty
B
The node is replaced automatically
C
The head becomes null but tail stays
D
The list doubles in size
4

Question 4

Why is deletion at the head an O(1) operation?

A
No traversal is required
B
Values are stored in sorted order
C
Nodes shift automatically
D
Pointers do not change
5

Question 5

Which error occurs if head.next is not preserved before deleting head?

A
The remaining list becomes inaccessible
B
The list reverses
C
Nodes duplicate themselves
D
Tail becomes null
6

Question 6

Why is deleting the tail in an SLL often O(n)?

A
You must traverse to the second-to-last node
B
You must delete all nodes first
C
Tail pointers do not exist
D
Sorting must be applied
7

Question 7

What is the next pointer of the new tail after deleting the last node?

A
null
B
head
C
The old tail
D
A special terminator
8

Question 8

Which node becomes the new tail after deleting the existing tail?

A
The node before the old tail
B
The head
C
The first node with smallest value
D
Null always
9

Question 9

What must be ensured before deleting the tail?

A
That the list is not empty
B
That the list is sorted
C
That the head is null
D
That every value is unique
10

Question 10

What special case occurs in tail deletion for an SLL?

A
When the list contains only one node
B
When head is null but tail is not
C
When nodes store identical values
D
When random access is enabled
11

Question 11

What is the first step when deleting by value?

A
Searching for the node with the target value
B
Always deleting head first
C
Sorting the list
D
Resetting tail
12

Question 12

What happens if the value to delete is at the head?

A
Head deletion logic is applied
B
Tail deletion is triggered
C
The list swaps values
D
Nothing; value deletion skips head
13

Question 13

How many pointers must change when deleting a middle node by value?

A
One pointer: prev.next
B
Two pointers always
C
Three pointers
D
None; nodes unlink themselves
14

Question 14

What should deletion by value return when no match exists?

A
A signal indicating failure
B
A new head
C
A reversed list
D
An automatically expanded list
15

Question 15

What error occurs if the predecessor pointer is not tracked during deletion by value?

A
Unable to reconnect the list after removed node
B
Values reorder themselves
C
The tail becomes the head
D
The list deletes all nodes
16

Question 16

What is required before deleting at a specific index?

A
Reaching the node before the one to be deleted
B
Sorting the list
C
Deleting the head first
D
Resetting tail
17

Question 17

Which index corresponds to deleting the head?

A
Index 0
B
Index 1
C
Index -1
D
Tail index only
18

Question 18

What happens when deleting the last node using index-based deletion?

A
The new tail becomes the previous node
B
The head becomes null automatically
C
The list copies itself
D
Values shift left
19

Question 19

What happens if the index is out of bounds?

A
The deletion fails or is rejected
B
The head is deleted instead
C
A new node is inserted
D
The list expands automatically
20

Question 20

What error arises if traversal overshoots the index to delete?

A
Incorrect node is removed
B
The list reorders itself
C
A random node becomes head
D
Tail becomes null always
21

Question 21

What deletion is shown here?

plaintext
head = head.next
A
Deletion at head
B
Deletion at tail
C
Deletion by value only
D
Deletion by position only
22

Question 22

What is missing from this deletion by position?

plaintext
prev.next = prev.next.next
A
Traversal to find prev first
B
Sorting of the list
C
Value comparison
D
Deleting the head first
23

Question 23

What does this pseudocode represent?

plaintext
if head.data == value:
          head = head.next
A
Deletion by value at head
B
Tail deletion
C
Insertion at head
D
Reversal
24

Question 24

What does this diagram show?

plaintext
[A] -> [B] -> [C]
             X
      Remove B
A
Deletion of a middle node
B
Deletion at head
C
Deletion at tail
D
Insertion at middle
25

Question 25

Which deletion is represented here?

plaintext
while curr.next != null:
          prev = curr
          curr = curr.next
      prev.next = null
A
Deletion at tail
B
Deletion at head
C
Deletion by value
D
Circular deletion
26

Question 26

What issue occurs if this is done incorrectly?

plaintext
prev.next = null
      // but curr is never freed or dropped
A
Memory leak or untracked node exists
B
List reverses itself
C
Tail becomes head
D
Nodes reorder by value
27

Question 27

Which deletion type requires knowing the predecessor node?

A
Deletion by value or position in middle
B
Deletion at head only
C
Deletion in empty list
D
Deletion in an array
28

Question 28

Which removal can affect both head and tail simultaneously?

A
Deleting the only node in the list
B
Deleting a value in the middle
C
Deleting by index 1
D
Deleting by value with duplicates
29

Question 29

What must deletion logic always preserve?

A
List continuity
B
Sorted order
C
Value uniqueness
D
Constant-time access
30

Question 30

What is the key requirement for safe deletion in a linked list?

A
Correct pointer updates for the affected nodes
B
Random access support
C
Nodes stored in contiguous memory
D
Automatic garbage collection

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