Stacks and Queues: Interactive Learning Quizzes for Computer Science Students

Question 1

Consider a stack implemented using an array. Which part of the array would be modified during a push operation?

Accepted Answer

End (last index)

Answer

Beginning (index 0)

Answer

Middle

Answer

Random location

Question 2

In a queue implemented using a linked list, which operation is more efficient?

Accepted Answer

Enqueue (insertion at the rear)

Answer

Dequeue (deletion from the front)

Answer

Both enqueue and dequeue

Answer

Neither enqueue nor dequeue

Question 3

What is the time complexity of a push operation in a stack implemented using a linked list?

Accepted Answer

O(1)

Answer

O(n)

Answer

O(log n)

Answer

O(n^2)

Question 4

Given the following sequence of operations on a stack: push(5), push(10), pop(), push(15), what is the value at the top of the stack after these operations?

Accepted Answer

15

Answer

5

Answer

10

Answer

25

Question 5

Which of the following is NOT a valid application of a queue in computer science?

Accepted Answer

Calculating square root of a number

Answer

Managing I/O operations

Answer

Implementing a breadth-first search algorithm

Answer

Caching web pages

Question 6

Which of the following is not a common application of a stack data structure?

Accepted Answer

Data sorting

Answer

Function calls

Answer

Expression evaluation

Answer

Memory management

Question 7

What is the purpose of a sentinel node in a singly linked list implementation of a queue?

Accepted Answer

To mark the end of the queue

Answer

To store the front element

Answer

To store the rear element

Answer

To improve the time complexity of enqueue and dequeue operations

Question 8

Which traversal method is commonly used in both stacks and queues?

Accepted Answer

Iterative traversal

Answer

Depth-first traversal

Answer

Breadth-first traversal

Answer

Recursive traversal

Question 9

What is the key difference between a stack and a heap data structure?

Accepted Answer

Stacks follow LIFO (Last In First Out) while heaps follow FIFO (First In First Out)

Answer

Stacks follow FIFO while heaps follow LIFO

Answer

Stacks are linear structures while heaps are hierarchical

Answer

Stacks are primarily used for memory management while heaps are used for sorting

Question 10

In which real-world scenario is a queue data structure commonly used?

Accepted Answer

Managing tasks in a multitasking operating system

Answer

Storing data for later retrieval

Answer

Handling function calls using a stack

Question 11

Which property characterizes a stack data structure?

Accepted Answer

Last In, First Out (LIFO)

Answer

First In, First Out (FIFO)

Answer

First In, Last Out (FILO)

Answer

Last In, Last Out (LILO)

Question 12

To add an element to the top of a stack, which operation is employed?

Accepted Answer

push()

Answer

add()

Answer

insert()

Answer

append()

Question 13

What data structure is utilized for managing elements in a queue?

Accepted Answer

Linked List

Answer

Array

Answer

Binary Tree

Answer

Hash Table

Question 14

What is the time complexity for enqueuing an element in a queue?

Accepted Answer

O(1)

Answer

O(log n)

Answer

O(n)

Answer

O(n^2)

Question 15

What data structure is suitable for implementing a priority queue efficiently?

Accepted Answer

Binary Heap

Answer

Sorted Array

Answer

Linked List

Answer

Hash Table

Question 16

What is a fundamental difference between stacks and queues?

Accepted Answer

Stacks follow Last In, First Out (LIFO) while queues follow First In, First Out (FIFO)

Answer

Queues are implemented using arrays while stacks cannot

Answer

Stacks are utilized for recursive calls while queues are used for BFS

Answer

Queues permit random access to elements while stacks do not

Question 17

Which of the following accurately characterizes a stack data structure?

Accepted Answer

A linear data structure adhering to the Last In First Out (LIFO) principle

Answer

A linear data structure adhering to the First In First Out (FIFO) principle

Answer

A hierarchical data structure resembling a tree in organization

Answer

A non-linear data structure facilitating arbitrary element access

Question 18

From the front of a queue, which operation eliminates an element?

Accepted Answer

Dequeue

Answer

Pop

Answer

Push

Answer

Enqueue

Question 19

When enqueueing an element into a linked list-based queue, what is its time complexity?

Accepted Answer

O(1)

Answer

O(n)

Answer

O(log n)

Answer

O(n^2)

Question 20

Which of the following is not a distinction between stacks and queues?

Accepted Answer

Queues support random access to elements

Answer

LIFO behavior in stacks, FIFO behavior in queues

Answer

Stacks commonly use arrays, queues often use linked lists for implementation

Answer

Both stacks and queues belong to the category of linear data structures

Question 21

Within a stack, what is the name of the element positioned at the top?

Accepted Answer

Top

Answer

Head

Answer

Tail

Answer

Front

Question 22

Among the following operations, which is not applicable to a stack?

Accepted Answer

Delete

Answer

Push

Answer

Pop

Answer

Peek

Question 23

In real-world scenarios, what is an example of a queue?

Accepted Answer

A line of individuals awaiting a bus

Answer

A stack of books arranged on a shelf

Answer

A binary tree employed for data storage

Answer

A hash table optimized for swift data retrieval

Question 24

In a linked list implementation of a queue, what is the purpose of a sentinel node?

Accepted Answer

Signaling the queue's end

Answer

Storing the queue's size

Answer

Optimizing enqueue operations for efficiency

Answer

Preventing memory leaks

Question 25

What is the time complexity of a push operation on a stack?

Accepted Answer

O(1)

Answer

O(log n)

Answer

O(n)

Answer

O(n^2)

Question 26

Which of the following is NOT a characteristic of a queue?

Accepted Answer

LIFO (Last-In-First-Out)

Answer

FIFO (First-In-First-Out)

Answer

Linear data structure

Answer

Used in simulations and scheduling

Question 27

What is the time complexity of a dequeue operation on a queue?

Accepted Answer

O(1)

Answer

O(log n)

Answer

O(n)

Answer

O(n^2)

Question 28

Which data structure is used to implement the undo/redo functionality in text editors?

Accepted Answer

Stack

Answer

Queue

Answer

Linked List

Answer

Array

Question 29

Which data structure is used to implement a breadth-first search (BFS) algorithm?

Accepted Answer

Queue

Answer

Stack

Answer

Linked List

Answer

Array

Question 30

Which of the following is NOT an advantage of using stacks?

Accepted Answer

Memory management

Answer

Simplicity and efficiency

Answer

Recursion support

Answer

Error handling

Question 31

Which of the following is NOT a benefit of using queues?

Accepted Answer

Dynamic memory allocation

Answer

FIFO order

Answer

Message passing

Answer

Load balancing

Question 32

In a real-world scenario, which data structure would be more appropriate for managing a call center queue?

Accepted Answer

Queue

Answer

Stack

Answer

Linked List

Answer

Array

Question 33

Which of the following is a typical application of a queue?

Accepted Answer

Managing a print job queue

Answer

Translating mathematical expressions

Answer

Representing a binary tree

Answer

Storing function parameters

Question 34

Which of the following is the correct implementation of a stack data structure in Java using an array?

Accepted Answer

private int[] arr; private int top = -1;

Answer

private int[] arr; private int head = 0;

Answer

private int[] arr; private int bottom = 0;

Answer

private int[] arr; private int size = 0;

Question 35

What is the time complexity of the push operation in a queue implemented using a linked list?

Accepted Answer

O(1)

Answer

O(log n)

Answer

O(n)

Question 36

Which of the following is an application of stacks in computing?

Accepted Answer

Function calls

Answer

Database management

Answer

Web browsing

Answer

File management

Question 37

What is the fundamental difference between a stack and a queue?

Accepted Answer

Stacks follow LIFO (Last-In-First-Out) while queues follow FIFO (First-In-First-Out).

Answer

Stacks are used for function calls while queues are used for message passing.

Answer

Stacks are implemented using arrays while queues are implemented using linked lists.

Question 38

Which of the following is a disadvantage of using stacks for managing function calls?

Accepted Answer

Limited memory space

Answer

Easy implementation

Answer

Efficient memory allocation

Answer

Fast retrieval of data

Question 39

What is the purpose of a circular queue?

Accepted Answer

To avoid wasting memory space

Answer

To simplify the implementation

Answer

To allow for multiple producers and consumers

Answer

To increase the speed of operations

Question 40

What is the key difference between a priority queue and a regular queue?

Accepted Answer

Priority queues allow elements to have priorities and are served based on those priorities.

Answer

Priority queues are implemented using arrays while regular queues are implemented using linked lists.

Answer

Priority queues have a faster time complexity for enqueue operations.

Question 41

Which of the following algorithms uses a stack to solve a problem?

Accepted Answer

Depth-first search

Answer

Dijkstra's algorithm

Answer

Breadth-first search

Answer

Kruskal's algorithm

Question 42

Which of the following operations is NOT supported by a stack?

Accepted Answer

Insertion at an arbitrary position

Answer

Deletion from the top

Answer

Retrieval of the top element

Answer

Insertion at the top

Question 43

A queue can be implemented using:

Accepted Answer

Arrays or linked lists

Answer

Stacks

Answer

Only linked lists

Answer

Only arrays

Question 44

Which of the following is a real-world example of a stack data structure?

Accepted Answer

Function calls in a program

Answer

Students in a line

Answer

Files on a computer

Answer

Customer records in a bank

Question 45

A queue follows which order of element processing?

Accepted Answer

First-In First-Out (FIFO)

Answer

Random order

Answer

Last-In First-Out (LIFO)

Answer

First-In Last-Out (FILO)

Question 46

Consider a stack with elements [A, B, C]. After performing three pop operations, the stack will contain:

Accepted Answer

Empty stack

Answer

[C, B, A]

Answer

[B]

Answer

[A]

Question 47

Which of the following is an advantage of using a queue over a stack?

Accepted Answer

Better performance for FIFO applications

Answer

Easier to implement

Answer

Faster element access

Answer

More efficient memory usage

Question 48

A circular buffer is:

Accepted Answer

A variant of the queue data structure

Answer

A linked list with a tail pointer

Answer

An array with a fixed size

Answer

A type of stack implementation

Question 49

Which of the following is a property of a double-ended queue (deque)?

Accepted Answer

Elements can be added or removed from both ends

Answer

It follows LIFO order

Answer

It uses a circular array implementation

Question 50

Which data structure follows the Last-In, First-Out (LIFO) principle, where the last element added is the first to be removed?

Accepted Answer

Stack

Answer

Tree

Answer

Linked List

Answer

Queue

Question 51

What is the operation that adds a new element to the top of a stack?

Accepted Answer

Push

Answer

Pop

Answer

Peek

Answer

Enqueue

Question 52

Which operation removes the top element from a stack?

Accepted Answer

Pop

Answer

Peek

Answer

Push

Answer

Dequeue

Question 53

In a queue, which element is removed first, following the First-In, First-Out (FIFO) principle?

Accepted Answer

The element at the front

Answer

The element at the back

Answer

The element with the highest priority

Answer

The most recently added element

Question 54

What operation adds an element to the back of a queue?

Accepted Answer

Enqueue

Answer

Push

Answer

Dequeue

Question 55

Which operation removes an element from the front of a queue?

Accepted Answer

Dequeue

Answer

Push

Answer

Pop

Answer

Enqueue

Question 56

Which of the following scenarios would be best suited for using a stack, where the most recently added element is processed first?

Accepted Answer

Undoing text edits in a word processor

Answer

Processing data in a first-come, first-served order

Answer

Managing customer service calls in a call center

Question 57

Which of the following scenarios would be best suited for using a queue, where elements are processed in the order they are added?

Accepted Answer

Managing customer service calls in a call center

Answer

Managing function calls in a program

Answer

Undoing text edits in a word processor

Answer

Evaluating mathematical expressions

Question 58

What is a common use case for stacks in computer science, where they are used to keep track of function calls and return addresses?

Accepted Answer

Function call management

Answer

Managing a waiting line for resources

Answer

Storing data in a specific order

Answer

Processing data in a FIFO manner

Question 59

Which of the following is NOT a common advantage of using stacks and queues?

Accepted Answer

They allow for random access to elements

Answer

They simplify the management of data flow

Answer

They are efficient for specific data access patterns

Answer

They can be used to implement complex algorithms