Data Handling for Year 8 Computing: Interactive Quizzes and Practice

Question 1

How does Huffman coding enhance data compression efficiency?

Accepted Answer

By assigning shorter codes to frequently occurring symbols, reducing the compressed data size.

Answer

By eliminating duplicate symbols before compression, reducing redundancy.

Answer

By converting data into binary format, simplifying storage and transmission.

Answer

By using a fixed-length code for all symbols, regardless of their frequency.

Question 2

Which of the following is a valid hexadecimal number?

Accepted Answer

ABCDEF

Answer

101010

Answer

123ABC

Question 3

Which of these is not a technique used to manipulate data?

Accepted Answer

Data validation

Answer

Sorting

Answer

Searching

Answer

Merging

Question 4

Why is binary search more efficient than linear search for large datasets?

Accepted Answer

Binary search has a time complexity of O(log n), while linear search has a time complexity of O(n).

Answer

Binary search can search unsorted data.

Answer

Binary search is easier to implement than linear search.

Question 5

Which data structure is best suited for quickly finding a particular item in a collection of data that is organized in ascending order?

Accepted Answer

Binary Search Tree

Answer

Array

Answer

Linked List

Question 6

Which of these is not considered a data structure?

Accepted Answer

Database

Answer

Array

Answer

Linked list

Answer

Queue

Question 7

Which data structure allows you to access items directly using a number?

Accepted Answer

Array

Answer

Stack

Answer

Queue

Question 8

Which of the following is an invalid hexadecimal digit?

Accepted Answer

Z

Answer

0

Answer

F

Question 9

Which of the following is a hexadecimal number?

Accepted Answer

FABCDE

Answer

11110000

Answer

789

Question 10

What is the binary equivalent of the decimal number 13?

Accepted Answer

00001101

Answer

00011001

Answer

00100101

Answer

01000011

Question 11

Which of these is a hexadecimal digit?

Accepted Answer

B

Answer

7

Answer

16

Answer

W

Question 12

Which of the following is a type of data structure?

Accepted Answer

Array

Answer

Expression

Answer

Function

Answer

Variable

Question 13

What is the main purpose of a sorting algorithm?

Accepted Answer

To organize data in ascending or descending order

Answer

To find a specific piece of data within a set

Answer

To remove duplicate data from a set

Answer

To combine similar data in a set

Question 14

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

Accepted Answer

A stack follows a LIFO (Last In First Out) approach, while a queue follows a FIFO (First In First Out) approach

Answer

A queue follows a LIFO (Last In First Out) approach, while a stack follows a FIFO (First In First Out) approach

Answer

A stack is a linear structure, while a queue is a circular structure

Answer

A queue is a linear structure, while a stack is a circular structure

Question 15

Which of the following is NOT a fundamental data manipulation technique?

Accepted Answer

Division

Answer

Sorting

Answer

Searching

Answer

Insertion

Question 16

What is the time complexity of a linear search in an unordered data set?

Accepted Answer

O(n)

Answer

O(1)

Answer

O(n^2)

Answer

O(log n)

Question 17

Which binary number is invalid?

Accepted Answer

123456

Answer

101010

Answer

110101

Answer

011100

Question 18

What is the ASCII code for 'A'?

Accepted Answer

65

Answer

75

Answer

85

Answer

95

Question 19

Which data structure is best for storing names in a list?

Accepted Answer

Array

Answer

Linked List

Answer

Stack

Answer

Queue

Question 20

What is the time complexity of a linear search algorithm?

Accepted Answer

O(n)

Answer

O(1)

Answer

O(log n)

Answer

O(n^2)

Question 21

Which sorting algorithm divides the array into smaller parts?

Accepted Answer

Merge Sort

Answer

Bubble Sort

Answer

Selection Sort

Answer

Insertion Sort

Question 22

Which is NOT a data manipulation operation?

Accepted Answer

Multiplying

Answer

Sorting

Answer

Searching

Answer

Adding

Question 23

What's the role of a data dictionary?

Accepted Answer

To describe data

Answer

To store data

Answer

To show data

Answer

To generate reports

Question 24

Identify the ASCII code that represents the lowercase letter 'a'.

Accepted Answer

97

Answer

65

Answer

100

Answer

110

Question 25

Identify the most efficient sorting algorithm for a large dataset.

Accepted Answer

Merge sort

Answer

Bubble sort

Answer

Selection sort

Answer

Insertion sort

Question 26

Which searching algorithm is the most efficient for finding an item in a sorted list?

Accepted Answer

Binary search

Answer

Linear search

Answer

Interpolation search

Answer

Jump search

Question 27

Identify the valid file extension for a text file.

Accepted Answer

.txt

Answer

.doc

Answer

.xls

Answer

.ppt

Question 28

Convert the binary number 10110101 to its hexadecimal representation.

Accepted Answer

BD

Answer

B5

Answer

DB

Answer

D5

Question 29

What is the ASCII code for the uppercase letter 'A'?

Accepted Answer

65

Answer

64

Answer

66

Answer

67

Question 30

What is the time complexity of the bubble sort algorithm?

Accepted Answer

O(n^2)

Answer

O(n)

Answer

O(n log n)

Answer

O(n^3)

Question 31

What is the main purpose of a look-up table?

Accepted Answer

To store frequently used values for quick access

Answer

To sort data in ascending order

Answer

To search for a specific element in a database

Answer

To generate random numbers

Question 32

What is the purpose of normalizing a database?

Accepted Answer

To reduce data redundancy and improve data integrity

Answer

To increase the size of the database

Answer

To make the database more secure

Answer

To improve the performance of the database

Question 33

Which programming language is commonly used for data analysis and machine learning?

Accepted Answer

Python

Answer

C++

Answer

Java

Answer

C#

Question 34

What is the purpose of a boolean data type?

Accepted Answer

To store true or false values

Answer

To store numbers

Answer

To store characters

Answer

To store dates

Question 35

Which unit of data is the smallest?

Accepted Answer

Bit

Answer

Byte

Answer

Nibble

Answer

Word

Question 36

Which of these is not a data structure?

Accepted Answer

Binary search algorithm

Answer

Array

Answer

Linked list

Answer

Tree

Question 37

What does a sorting algorithm do?

Accepted Answer

Organizes data in ascending or descending order

Answer

Searches for a specific element

Answer

Removes duplicate data

Answer

Creates a new data structure

Question 38

Linear search algorithms have a time complexity of:

Accepted Answer

O(n)

Answer

O(log n)

Answer

O(n^2)

Answer

O(1)

Question 39

What is the ASCII code for the capital letter 'A'?

Accepted Answer

65

Answer

75

Answer

85

Answer

95

Question 40

What is the purpose of a data dictionary?

Accepted Answer

Stores definitions of data elements and their relationships

Answer

Validates data

Answer

Generates reports

Answer

Creates a data model

Question 41

What differentiates a primary key from a foreign key?

Accepted Answer

A primary key uniquely identifies a record, while a foreign key references another record

Answer

A foreign key uniquely identifies a record, while a primary key references another record

Answer

Both primary and foreign keys can be used for data retrieval

Answer

They are interchangeable terms

Question 42

Which data structure stores data as key-value pairs?

Accepted Answer

Dictionary

Answer

Array

Answer

Stack

Answer

Queue

Question 43

What is the time complexity of a linear search algorithm?

Accepted Answer

O(n)

Answer

O(1)

Answer

O(log n)

Answer

O(n^2)

Question 44

Explain the distinction between a variable and a constant.

Accepted Answer

Variables can be altered, whereas constants remain fixed.

Answer

Constants can be altered, whereas variables are immutable.

Answer

Variables reside in memory, while constants do not.

Answer

Constants reside in memory, while variables do not.

Question 45

Which data type is designed to hold numbers with decimals?

Accepted Answer

Float

Answer

Integer

Answer

String

Answer

Boolean

Question 46

What is the primary purpose of a loop in programming?

Accepted Answer

Iterate over a set of instructions repeatedly.

Answer

Store data efficiently.

Answer

Perform complex calculations.

Answer

Display output on the screen.

Question 47

Which of the following is not considered a programming language?

Accepted Answer

Microsoft Word

Answer

Python

Answer

Java

Answer

C++

Question 48

Which type of data structure efficiently connects related data items?

Accepted Answer

Linked list

Answer

Array

Answer

Stack

Answer

Queue

Question 49

Which sorting algorithm has the best average and worst-case time complexity for large datasets?

Accepted Answer

Merge sort

Answer

Bubble sort

Answer

Insertion sort

Answer

Quick sort

Question 50

How does a binary search algorithm efficiently locate an item within a sorted array?

Accepted Answer

By iteratively dividing the array into smaller halves

Answer

By comparing the target element to the midpoint of the array

Answer

By using a linear search to check each element

Answer

By applying a hashing function to find the element

Question 51

What is the distinction between a primary key and a foreign key in a relational database?

Accepted Answer

A primary key uniquely identifies a row, while a foreign key references a primary key in another table

Answer

A foreign key is required for data integrity, while a primary key is optional

Answer

A foreign key can have multiple values, while a primary key is unique

Answer

A primary key is included in a composite key, while a foreign key is not

Question 52

Which SQL command is used to modify existing data in a database?

Accepted Answer

UPDATE

Answer

SELECT

Answer

INSERT

Answer

DELETE

Question 53

Find the hexadecimal equivalent of the decimal number 255.

Accepted Answer

FF

Answer

1FF

Answer

10FF

Answer

100FF

Question 54

What is the primary purpose of a data structure?

Accepted Answer

To organize and store data efficiently

Answer

To perform calculations

Answer

To display data in a user-friendly format

Answer

To manage user input

Question 55

Which sorting algorithm is known for its efficiency in handling large datasets?

Accepted Answer

Merge Sort

Answer

Bubble Sort

Answer

Insertion Sort

Answer

Selection Sort

Question 56

What is the time complexity of a linear search algorithm?

Accepted Answer

O(n)

Answer

O(log n)

Answer

O(n^2)

Answer

O(1)

Question 57

Which data structure is commonly used to store a collection of unique key-value pairs?

Accepted Answer

Dictionary

Answer

Array

Answer

List

Answer

Stack

Question 58

Which of the following is NOT a valid data type in Python?

Accepted Answer

Binary

Answer

Integer

Answer

Float

Answer

Boolean

Question 59

What is the output of the Python code: print(bin(15))?

Accepted Answer

0b1111

Answer

1111

Answer

15

Answer

Binary 15

Question 60

Which of the following is a hexadecimal number?

Accepted Answer

A3F

Answer

1001

Answer

11001001

Answer

0b11010

Question 61

Convert the binary number 11010110 to decimal.

Accepted Answer

102

Answer

110

Answer

210

Answer

201

Question 62

Which data structure would be most suitable for storing a list of student names?

Accepted Answer

Array

Answer

Linked list

Answer

Stack

Answer

Queue

Question 63

What is the time complexity of a linear search algorithm?

Accepted Answer

O(n)

Answer

O(1)

Answer

O(log n)

Answer

O(n^2)

Question 64

What is the main purpose of a hash function?

Accepted Answer

To create a unique identifier for a data item

Answer

To arrange data in ascending order

Answer

To reduce the size of data

Answer

To scramble data to make it unreadable