Data Representation: Interactive Quizzes for Year 7 Computing Students

Question 1

A group of bits that represent a single character is known as a:

Accepted Answer

Byte

Answer

Bit

Answer

Word

Answer

Nibble

Question 2

What's the main purpose of data validation?

Accepted Answer

To ensure entered data is accurate and consistent

Answer

To improve program performance

Answer

To restrict unauthorized access to data

Answer

To reduce the size of data files

Question 3

Which of the following is considered a lossy compression technique?

Accepted Answer

JPEG

Answer

GIF

Answer

PNG

Answer

ZIP

Question 4

In a database, what purpose does a primary key serve?

Accepted Answer

To uniquely identify each record in a table

Answer

To enforce data integrity between tables

Answer

To store the most important data in a table

Answer

To enhance query performance

Question 5

What is the purpose of ASCII codes?

Accepted Answer

To represent numbers as characters

Answer

To compress data

Answer

To encrypt data

Answer

To store images

Question 6

Which of the following is NOT a file format?

Accepted Answer

Algorithm

Answer

Text

Answer

Binary

Answer

Vector

Question 7

What benefit does cloud storage provide?

Accepted Answer

Access to data from anywhere

Answer

Higher security than local storage

Answer

Lower cost than local storage

Answer

Faster speed than local storage

Question 8

Which of the following is an incorrect data type in Python?

Accepted Answer

Array

Answer

Integer

Answer

String

Answer

Boolean

Question 9

What is the main purpose of using a variable in a programming language?

Accepted Answer

To temporarily store data and information

Answer

To permanently store data and information

Answer

To perform calculations and operations

Answer

To control the flow of a program

Question 10

Which of the following is used to open a file in Python?

Accepted Answer

open()

Answer

read()

Answer

write()

Answer

close()

Question 11

What is the main function of a primary key in a database table?

Accepted Answer

To uniquely identify each row within the table

Answer

To store the most critical data in the table

Answer

To establish links between tables

Answer

To ensure the accuracy and consistency of data

Question 12

What is the primary function of a router in a network?

Accepted Answer

To direct packets of data between networks

Answer

To connect devices within a network

Answer

To safeguard a network's security

Answer

To store and manage data

Question 13

Data can be represented in different ways. Which of these is **not** a way to represent data?

Accepted Answer

Ideas

Answer

Text

Answer

Numbers

Answer

Sound

Question 14

The binary number system uses only two digits, 0 and 1. What is the correct definition of the binary number system?

Accepted Answer

A system that uses only the numbers 0 and 1

Answer

A system that uses only the numbers 1 and 0

Answer

A system that uses only the numbers 0 and 9

Answer

A system that uses only the numbers 1 and 9

Question 15

When you compress an image, you can use lossy or lossless compression techniques. Which of these techniques results in losing some of the original image data?

Accepted Answer

Lossy compression

Answer

Lossless compression

Answer

Both lossy and lossless compression

Answer

Neither lossy nor lossless compression

Question 16

Data structures are used to organise and store data in a computer system. Which of these is **not** a type of data structure?

Accepted Answer

Variable

Answer

Array

Answer

List

Answer

Queue

Question 17

A hash table is a data structure that is used to store data in a key-value pair format. What is the main purpose of using a hash table?

Accepted Answer

To quickly find and retrieve data based on a key

Answer

To store data in a sequential order

Answer

To store data in a hierarchical structure

Answer

To store data in a relational format

Question 18

Databases are used to store and manage large amounts of data. Which of these is **not** a benefit of using a database?

Accepted Answer

Easy data deletion

Answer

Data integrity

Answer

Data security

Answer

Data sharing

Question 19

In a database, a primary key and a foreign key are used to establish relationships between tables. What is the difference between a primary key and a foreign key?

Accepted Answer

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

Answer

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

Answer

A primary key and a foreign key are the same thing

Answer

A primary key is used to store data, while a foreign key is used to retrieve data

Question 20

Data validation is used to check if data entered into a computer system is correct and complete. Which of these is **not** a type of data validation?

Accepted Answer

Spell checking

Answer

Range checking

Answer

Type checking

Answer

Format checking

Question 21

A data dictionary is a document that provides information about the structure and contents of a database. What is the main purpose of a data dictionary?

Accepted Answer

To document the structure and contents of a database

Answer

To store data in a database

Answer

To query data in a database

Answer

To update data in a database

Question 22

Which of the following is a lossless data compression technique?

Accepted Answer

GIF

Answer

JPEG

Answer

MP3

Answer

MPEG

Question 23

What is the resolution of an image that measures 1024 pixels in width and 768 pixels in height?

Accepted Answer

1024 x 768

Answer

768 x 1024

Answer

1792

Answer

589824

Question 24

Which of these file extensions is commonly associated with Microsoft Word documents?

Accepted Answer

.doc

Answer

.txt

Answer

.xls

Answer

.ppt

Question 25

What is the main purpose of data compression?

Accepted Answer

To make a file smaller in size.

Answer

To speed up file transfers.

Answer

To enhance data security.

Answer

To improve data quality.

Question 26

What is the ASCII code (a number) for the lowercase letter 'a'?

Accepted Answer

97

Answer

65

Answer

122

Answer

101

Question 27

Which of the following is NOT a common type of data format?

Accepted Answer

Object

Answer

Text

Answer

Number

Answer

Image

Question 28

The hexadecimal number '1A' is equivalent to which of the following in base 10 (decimal)?

Accepted Answer

26

Answer

10

Answer

16

Answer

32

Question 29

Which of the following is a data format used to store and compress images with some loss of quality?

Accepted Answer

JPEG

Answer

PNG

Answer

GIF

Answer

BMP

Question 30

What is the main purpose of a checksum?

Accepted Answer

To detect errors in data transmission

Answer

To encrypt data

Answer

To compress data

Answer

To convert data from one format to another

Question 31

What is the key difference between a variable and a constant in programming?

Accepted Answer

A variable's value can change, while a constant's value cannot.

Answer

A constant's value can change, while a variable's value cannot.

Answer

Variables and constants are always the same thing.

Answer

Variables store data while constants store instructions.

Question 32

What is the primary role of an operating system on a computer?

Accepted Answer

To manage the hardware and software resources of the computer

Answer

To create and edit documents

Answer

To browse the internet

Answer

To play games

Question 33

Which data format is commonly used to represent numbers on computers?

Accepted Answer

Binary

Answer

ASCII

Answer

JPEG

Answer

PNG

Question 34

Which of the following is NOT a common image data format?

Accepted Answer

ASCII

Answer

GIF

Answer

JPEG

Answer

PNG

Question 35

What is the binary number equivalent of the decimal number 13?

Accepted Answer

1101

Answer

1111

Answer

1011

Answer

1001

Question 36

What is the primary purpose of using a compression algorithm?

Accepted Answer

To reduce the size of a file

Answer

To increase the size of a file

Answer

To change the file format

Answer

To encrypt the file

Question 37

What is the main difference between a raster image and a vector image?

Accepted Answer

Raster images are made up of pixels, while vector images are made up of lines and shapes

Answer

Raster images are smaller in size than vector images

Answer

Vector images are more detailed than raster images

Answer

Raster images are used for photographs, while vector images are used for drawings

Question 38

What is the function of a hash function?

Accepted Answer

To generate a unique identifier for a data item

Answer

To encrypt a data item

Answer

To compress a data item

Answer

To search for a data item

Question 39

Which of the following is NOT a type of data mining technique?

Accepted Answer

Data visualisation

Answer

Classification

Answer

Clustering

Answer

Regression

Question 40

Which of these options is a data type used for representing text?

Accepted Answer

String

Answer

Boolean

Answer

Integer

Answer

Double

Question 41

Which file format is used to store images?

Accepted Answer

BMP

Answer

TXT

Answer

HTML

Answer

CSV

Question 42

What is the primary reason for converting data from one format to another?

Accepted Answer

To allow computers to process the data more efficiently

Answer

To decrease the size of the data

Answer

To enhance data security

Answer

To make data easier to share

Question 43

Which of the following is NOT a characteristic of valid data?

Accepted Answer

Timeliness

Answer

Accuracy

Answer

Reliability

Answer

Completeness

Question 44

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

Accepted Answer

65

Answer

97

Answer

72

Answer

80

Question 45

Which data structure is used to organize a collection of similar data elements?

Accepted Answer

Array

Answer

Tree

Answer

Graph

Answer

Queue

Question 46

What is the distinction between a bit and a byte?

Accepted Answer

A bit is a binary digit, while a byte is made up of 8 bits

Answer

A bit is 8 times smaller than a byte

Answer

A byte is 8 times smaller than a bit

Answer

There is no difference between a bit and a byte

Question 47

Which of the following is an example of a lossless data compression technique?

Accepted Answer

ZIP

Answer

JPEG

Answer

MP3

Answer

AVI

Question 48

What is the main purpose of metadata?

Accepted Answer

To provide information about other data

Answer

To securely store sensitive data

Answer

To improve data performance

Answer

To compress data

Question 49

Which of these is **not** a type of data representation?

Accepted Answer

Object

Answer

Text

Answer

Number

Answer

Image

Question 50

Which data type is used for representing whole numbers?

Accepted Answer

Integer

Answer

String

Answer

Float

Answer

Boolean

Question 51

Which image compression technique preserves the original image quality?

Accepted Answer

PNG

Answer

JPEG

Answer

GIF

Answer

BMP

Question 52

What's the main purpose of a data structure?

Accepted Answer

To organize data for easy access

Answer

To store data in a specific format

Answer

To encrypt data for security

Answer

To delete unnecessary data

Question 53

Which characteristic is **not** desirable for data representation?

Accepted Answer

Ambiguous

Answer

Accurate

Answer

Concise

Answer

Efficient

Question 54

What's a key advantage of using a database?

Accepted Answer

It simplifies handling large amounts of data

Answer

It stores data in many different files

Answer

It guarantees data is never lost or corrupted

Answer

It ensures data is always current

Question 55

What's the difference between a primary and foreign key?

Accepted Answer

A primary key identifies a row uniquely, while a foreign key links tables

Answer

A primary key can't be repeated, unlike a foreign key

Answer

A primary key is numeric, while a foreign key can be any data type

Answer

A primary key is used for creating a table, while a foreign key is used for changing a table

Question 56

What's the main purpose of a web server?

Accepted Answer

To deliver websites to users

Answer

To store websites

Answer

To manage email

Answer

To protect websites from hackers

Question 57

What is the primary purpose of a checksum?

Accepted Answer

To ensure the integrity of data during transmission

Answer

To encrypt data

Answer

To compress data

Answer

To format data

Question 58

Which of the following options is NOT a file format for images?

Accepted Answer

DOCX

Answer

JPEG

Answer

PNG

Answer

TIFF

Question 59

What is the key difference between analogue and digital data?

Accepted Answer

Analogue data is continuous, while digital data is discrete

Answer

Digital data is continuous, while analogue data is discrete

Answer

Both analogue and digital data are continuous

Answer

Both analogue and digital data are discrete

Question 60

Which of the following is a vector graphic format?

Accepted Answer

SVG

Answer

JPEG

Answer

PNG

Answer

BMP

Question 61

What is the primary purpose of a database?

Accepted Answer

To store and organise large amounts of data

Answer

To perform calculations on data

Answer

To create reports and visualisations

Answer

To share data with others

Question 62

What is the primary purpose of a query in a database?

Accepted Answer

To retrieve specific data from a database

Answer

To update data in a database

Answer

To create a new database

Answer

To delete data from a database

Question 63

Which data format is commonly used to represent text information?

Accepted Answer

ASCII

Answer

JPEG

Answer

MP3

Answer

WAV

Question 64

How many bits are present in a single byte?

Accepted Answer

8

Answer

4

Answer

16

Answer

32