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Linked List Insertion Operations Quiz

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

30 Questions
~60 minutes
1

Question 1

What pointer must be updated first when inserting at the head of a singly linked list?

A
The new node’s next pointer
B
The last node’s next pointer
C
The head’s previous pointer
D
A null terminator
2

Question 2

What happens after setting new.next when inserting at head?

A
Head is updated to point to the new node
B
Tail becomes null
C
Nodes automatically reorder
D
A new tail is created
3

Question 3

What happens when inserting at the head of an empty list?

A
The new node becomes both head and tail
B
The next pointer must be null
C
The list becomes invalid
D
The list auto-expands to two nodes
4

Question 4

Which operation is the fastest for inserting at head?

A
O(1) time complexity
B
O(n) time complexity
C
Requires scanning the list
D
Needs searching for duplicates first
5

Question 5

Why is insertion at head often used in stack-like behavior?

A
Because it supports quick pushes
B
Because it maintains sorted order automatically
C
Because it overwrites the tail
D
Because it removes duplicates
6

Question 6

Why does inserting at the tail in an SLL often require traversal?

A
Because the tail pointer is not always stored
B
Because the head is removed each time
C
Because tail cannot reference next
D
Because nodes shift position automatically
7

Question 7

What is the next pointer of a newly inserted tail node?

A
null
B
head
C
tail
D
The middle node
8

Question 8

When inserting at tail, which pointer must be updated?

A
Old tail’s next
B
Head.prev
C
A previous index map
D
The null terminator pointer
9

Question 9

What equality condition identifies the current tail during traversal?

A
curr.next == null
B
curr == head
C
curr.data is smallest
D
curr.next cycles to head
10

Question 10

What happens if an empty list receives a tail insertion?

A
The new node becomes both head and tail
B
Tail insertion fails
C
Only tail is updated
D
The list must insert at head first
11

Question 11

What is required before inserting at a specific index?

A
Traversing to the node before the index
B
Deleting the node at the index
C
Sorting the list
D
Resetting the head pointer
12

Question 12

Where does insertion at index 0 occur?

A
At the head
B
At the tail
C
At a middle position
D
Before an imaginary null node
13

Question 13

What happens if the specified index equals the length of the list?

A
The new node is inserted at the tail
B
Insertion fails
C
The list must be reversed first
D
A new head is created
14

Question 14

How many pointers need adjustment when inserting in the middle of an SLL?

A
Two pointers: prev.next and new.next
B
Only one pointer
C
Three pointers
D
None; nodes adjust automatically
15

Question 15

Which error occurs if prev.next is overwritten before saving it?

A
The rest of the list becomes disconnected
B
The list reverses automatically
C
Node values change unexpectedly
D
The head becomes corrupted
16

Question 16

What operation is shown here?

plaintext
new.next = head
      head = new
A
Insertion at head
B
Insertion at tail
C
Middle insertion
D
Deletion
17

Question 17

Which node becomes the successor after this update?

plaintext
prev.next = new
      new.next = curr
A
curr
B
prev
C
head
D
null
18

Question 18

What insertion is shown here?

plaintext
while curr.next != null:
          curr = curr.next
      curr.next = new
A
Insertion at tail
B
Insertion at head
C
Insertion at index 0
D
Middle insertion
19

Question 19

What is missing from this specific-position insertion?

plaintext
prev = head
      for i in range(index):
          prev = prev.next
      prev.next = new
A
Setting new.next to the old prev.next
B
Deleting the tail first
C
Sorting nodes by index
D
Resetting head.prev
20

Question 20

What happens in this head insertion?

plaintext
if head == null:
          head = new
      else:
          new.next = head
          head = new
A
It correctly handles both empty and non-empty cases
B
It corrupts the tail
C
It creates multiple heads
D
It reverses the list
21

Question 21

What does this code do?

plaintext
if index == 0:
          new.next = head
          head = new
A
Inserts at head when index is 0
B
Removes the head
C
Inserts at tail
D
Swaps two nodes
22

Question 22

Which insertion requires the most traversal effort?

A
Insertion at a specific position
B
Insertion at head
C
Insertion into an empty list
D
Insertion at tail when tail pointer exists
23

Question 23

Which insertion risk occurs if traversal overshoots the desired index?

A
Incorrect placement of the new node
B
Permanent loss of head
C
Tail becomes middle
D
Nodes swap automatically
24

Question 24

Which insert ensures that the list length always increases by 1?

A
Any successful insertion
B
Only head insertion
C
Only tail insertion
D
Only middle insertion
25

Question 25

Which position results in the fastest insertion?

A
Head
B
Tail without tail pointer
C
Middle index
D
Before null
26

Question 26

Which pointer must always be preserved during insertion?

A
The successor link of the insertion point
B
The pointer to the smallest value
C
A pointer to the memory index
D
A parent pointer
27

Question 27

What is required to insert after the last node?

A
A reference to the current tail
B
Binary search
C
Resetting head first
D
Deleting the head
28

Question 28

What index corresponds to inserting immediately after head?

A
Index 1
B
Index 0
C
Index 2
D
Index -1
29

Question 29

What happens when inserting at an index greater than list length?

A
The operation typically fails or is rejected
B
The new node becomes the new head
C
Nodes shift automatically
D
The list doubles in size
30

Question 30

Which insertion updates the fewest number of pointers?

A
Insertion at head
B
Insertion at tail
C
Insertion at middle
D
Insertion at index 1

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