Data Structures: Interactive Learning Quizzes for Year 6 Computing

Question 1

Which of the following is an example of a list in Python?

Accepted Answer

[1, 2, 3]

Answer

{a: 1, b: 2, c: 3}

Answer

(1, 2, 3)

Answer

1, 2, 3

Question 2

What is the difference between a list and a tuple in Python?

Accepted Answer

Lists can be changed, while tuples cannot

Answer

Tuples can be changed, while lists cannot

Answer

Lists and tuples can both be changed

Answer

Lists and tuples can both not be changed

Question 3

Which of the following operators is used to add two numbers in Python?

Accepted Answer

+

Answer

-

Answer

*

Answer

/

Question 4

Which of the following is a valid variable name in Python?

Accepted Answer

my_variable

Answer

123

Answer

%

Answer

print

Question 5

What is the purpose of a function in Python?

Accepted Answer

To group related code together

Answer

To save information

Answer

To display output

Answer

To stop the program

Question 6

Which of the following is NOT a benefit of using functions in Python?

Accepted Answer

Increased program complexity

Answer

Code reusability

Answer

Improved readability

Answer

Easier debugging

Question 7

Why are data structures useful for managing data?

Accepted Answer

To organize data for efficient storage and retrieval

Answer

To slow down data retrieval

Answer

To increase memory usage

Answer

To reduce data security

Question 8

Which of the following is a data structure that stores data in a sequential order, allowing access to any element by its index?

Accepted Answer

Array

Answer

Function

Answer

Loop

Answer

Variable

Question 9

What is the primary purpose of using an array data structure?

Accepted Answer

To store a collection of related data items.

Answer

To perform calculations on data.

Answer

To control the flow of a program.

Answer

To compare two or more values.

Question 10

Which of the following is NOT an advantage of using a stack data structure?

Accepted Answer

Supports random access to data

Answer

First-in, first-out (FIFO) access to data

Answer

Efficient use of memory

Answer

Simple to implement

Question 11

What is the difference between the position of an element in an array and the value stored at that position?

Accepted Answer

The position of the element in the array is called the index, while the value stored at that position is called the value.

Answer

The index is the value stored at the element, while the value is the position of the element in the array.

Answer

The index and the value are the same thing.

Answer

There is no such thing as an array index.

Question 12

What is the time complexity of accessing an element in an array using its index?

Accepted Answer

O(1)

Answer

O(n)

Answer

O(log n)

Answer

O(n^2)

Question 13

Which of the following is a type of data structure used to store a collection of data items of the same type?

Accepted Answer

Array

Answer

Variable

Answer

Function

Answer

Program

Question 14

Which of the following is the correct way to create an array in Python?

Accepted Answer

array_name = []

Answer

array_name = ()

Answer

array_name = {}

Answer

array_name = <>

Question 15

Which data structure is used to store data in a Last-In-First-Out (LIFO) order?

Accepted Answer

Stack

Answer

Queue

Answer

Array

Answer

List

Question 16

What is the main purpose of using a queue?

Accepted Answer

To store data items that need to be processed in a specific order

Answer

To store data items that need to be accessed randomly

Answer

To store data items that need to be sorted

Answer

To store data items that need to be grouped

Question 17

What is a data structure?

Accepted Answer

A way of organizing and storing data

Answer

A type of computer program

Answer

A storage device

Answer

A software application

Question 18

Which of these is NOT a type of data structure?

Accepted Answer

Database

Answer

Array

Answer

List

Answer

Stack

Question 19

What is the main purpose of using an array?

Accepted Answer

To store data in a specific order

Answer

To perform calculations on data

Answer

To compare different pieces of data

Answer

To display data on a screen

Question 20

Which of these is an advantage of using a linked list?

Accepted Answer

Easy to insert or remove items

Answer

Efficient for searching large amounts of data

Answer

Can store different types of data in the same list

Answer

Uses less memory than an array

Question 21

What is the time complexity of searching for an element in a binary search tree?

Accepted Answer

O(log n)

Answer

O(1)

Answer

O(n)

Answer

O(n^2)

Question 22

What is a hash table?

Accepted Answer

A data structure that uses a hash function to map keys to values

Answer

A type of database

Answer

A programming language

Answer

A computer algorithm

Question 23

Which of these is NOT a disadvantage of using a linked list?

Accepted Answer

Difficult to implement

Answer

Inefficient for accessing elements in the middle of the list

Answer

Can be more memory-intensive than arrays

Answer

Not suitable for storing large amounts of data

Question 24

What is the difference between a binary search tree and a binary tree?

Accepted Answer

A binary search tree has a specific ordering of elements for efficient searching

Answer

A binary tree can store duplicate elements, while a binary search tree cannot

Answer

A binary search tree is always balanced, while a binary tree may not be

Answer

There is no difference between a binary search tree and a binary tree

Question 25

Which type of data structure can store and organize multiple values?

Accepted Answer

Array

Answer

Variable

Answer

Index

Answer

Pointer

Question 26

A data structure that follows the Last In, First Out (LIFO) principle is called a:

Accepted Answer

Stack

Answer

Queue

Answer

List

Answer

Array

Question 27

In an array, the first element's index is always:

Accepted Answer

0

Answer

1

Answer

The array's length

Answer

The last index

Question 28

To access a specific element in a list, we use a:

Accepted Answer

Index

Answer

Pointer

Answer

Variable

Answer

Reference

Question 29

In which algorithm is a queue data structure commonly used?

Accepted Answer

Breadth-first search

Answer

Depth-first search

Answer

Sorting

Answer

Tree traversal

Question 30

Which benefit do linked lists offer?

Accepted Answer

Inserting and removing elements easily

Answer

Getting to any element quickly

Answer

Using fixed amounts of memory

Answer

Being simple to create

Question 31

A data structure used to store unique elements is called a:

Accepted Answer

Set

Answer

Bag

Answer

List

Answer

Array

Question 32

Which of these is NOT a common data structure?

Accepted Answer

Chart

Answer

Array

Answer

List

Answer

Stack

Question 33

Which method do we use to add an item to the end of a list?

Accepted Answer

append()

Answer

add()

Answer

insert()

Answer

push()

Question 34

Which data structure is often used to show a family tree?

Accepted Answer

Tree

Answer

Array

Answer

Queue

Answer

List

Question 35

What is the main reason for using a hash table?

Accepted Answer

To store data quickly using keys.

Answer

To organise data in a timeline.

Answer

To show data in a family tree structure.

Answer

To create a queue data structure.

Question 36

What is an advantage of using arrays?

Accepted Answer

They allow fast access to any item.

Answer

Their size can change to fit more data.

Answer

They can store different types of data.

Answer

They make it easy to add or remove items quickly.

Question 37

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

Accepted Answer

Stacks use LIFO, while queues use FIFO.

Answer

Stacks store data in a family tree structure, while queues do not.

Answer

Stacks are used to run programs, while queues are not.

Answer

Stacks are better for storing large amounts of data.

Question 38

What is the main purpose of using an array?

Accepted Answer

To efficiently store data in a specific order and access it directly using an index

Answer

To store data of different types

Answer

To perform complex mathematical operations on data

Answer

To create a hierarchical data structure

Question 39

What is a key difference between an array and a list?

Accepted Answer

Arrays are fixed in size, while lists can grow and shrink dynamically

Answer

Lists can store different data types, while arrays cannot

Answer

Arrays are more efficient for accessing data than lists

Answer

Lists are more secure than arrays

Question 40

Which data structure would be most appropriate for storing a set of student names?

Accepted Answer

List

Answer

Array

Answer

Stack

Answer

Queue

Question 41

What is the advantage of using a stack data structure?

Accepted Answer

Efficiently adding and removing elements only from the top (last-in, first-out)

Answer

Efficiently adding and removing elements from any position

Answer

Efficient random access to any element

Answer

Efficient sorting of elements

Question 42

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

Accepted Answer

Sort

Answer

Push

Answer

Pop

Answer

Peek

Question 43

What is a real-world application of a queue data structure?

Accepted Answer

Managing a line of people waiting for service (first-in, first-out)

Answer

Storing data that needs to be processed in strict order

Answer

Creating a dynamic list of items

Answer

Storing hierarchical data

Question 44

Which data structure is often used as the underlying implementation for a breadth-first search algorithm?

Accepted Answer

Queue

Answer

Array

Answer

List

Answer

Stack

Question 45

What is the time complexity of searching for an element in an unsorted array?

Accepted Answer

O(n) - linear time

Answer

O(1) - constant time

Answer

O(log n) - logarithmic time

Answer

O(n^2) - quadratic time

Question 46

What is a data structure used for?

Accepted Answer

Storing and organizing data efficiently

Answer

Connecting computer hardware components

Answer

Writing software programs

Answer

Sending messages over the internet

Question 47

Which data structure would you use to store a group of related items, such as names of students in a class?

Accepted Answer

Array

Answer

Graph

Answer

Tree

Answer

Linked list

Question 48

What is a key advantage of using a stack data structure?

Accepted Answer

It follows the Last-in, First-out (LIFO) principle

Answer

It is the most versatile data structure and can be used for many different purposes

Answer

It allows for easy access to any element in the data

Answer

It can store large amounts of data without losing performance

Question 49

Which of the following is NOT a type of data structure?

Accepted Answer

Formula

Answer

Array

Answer

Queue

Question 50

What is the main difference between arrays and linked lists?

Accepted Answer

Arrays store elements in contiguous memory locations, while linked lists do not

Answer

Arrays can only store numbers, while linked lists can store any type of data

Answer

Linked lists are always faster than arrays

Question 51

Which data structure is most commonly used for performing a depth-first search (DFS) in a graph?

Accepted Answer

Stack

Answer

Hash table

Answer

Queue

Answer

Tree

Question 52

Which data structure is specifically designed for storing unique elements and efficiently checking if an element is present?

Accepted Answer

Set

Answer

Queue

Answer

Array

Answer

Dictionary