Data Representation Quizzes for Year 8 Computing Students

Question 1

Which of these is a type of data used in computers?

Accepted Answer

Text

Accepted Answer

Number

Accepted Answer

Image

Answer

Action

Question 2

Which image format is widely used for compressing photographs while preserving image quality?

Accepted Answer

JPEG

Answer

PNG

Answer

GIF

Answer

BMP

Question 3

What is the purpose of a sound card in a computer system?

Accepted Answer

To process and produce sound

Answer

To store data on the hard drive

Answer

To display images on the monitor

Answer

To connect to the internet

Question 4

How are images represented in computers?

Accepted Answer

Using numbers to represent colors

Answer

As text characters

Answer

As sound waves

Answer

By storing the image as a whole

Question 5

Which tool is typically used to convert an image file from one format to another?

Accepted Answer

An image editor

Answer

A word processor

Answer

A spreadsheet

Answer

A video player

Question 6

How does a computer store sound as a digital file?

Accepted Answer

As a series of numbers representing sound waves

Answer

As text characters

Answer

As images

Answer

As videos

Question 7

Which of the following is an example of a lossy compression format?

Accepted Answer

JPEG

Answer

GIF

Answer

PNG

Answer

BMP

Question 8

How are text characters represented in computers?

Accepted Answer

Using the ASCII or Unicode code

Answer

Using binary code

Answer

Using Morse code

Answer

Using sign language

Question 9

Which of the following is a lossy sound compression technique?

Accepted Answer

MP3

Answer

WAV

Answer

MIDI

Answer

FLAC

Question 10

Which of the following is the smallest unit of data in a computer?

Accepted Answer

Bit

Answer

Byte

Answer

Kilobyte

Answer

Megabyte

Question 11

How is sound generally represented in a computer?

Accepted Answer

As a series of digital samples

Answer

As a series of analog waves

Answer

As a series of MIDI messages

Answer

As a series of symbols

Question 12

What is a key purpose of a file format?

Accepted Answer

To specify how data is stored in a file

Answer

To specify how data is transmitted over a network

Answer

To specify how data is processed by a computer

Answer

To specify how data is displayed on a screen

Question 13

Which of the following is an example of a vector graphic?

Accepted Answer

A line drawing

Answer

A photograph

Answer

A 3D model

Answer

A bitmap image

Question 14

Which of the following is NOT a factor that can affect the size of a digital image?

Accepted Answer

Storage space available

Answer

Image resolution

Answer

Image size

Answer

File format

Question 15

What is the difference between a bit and a byte?

Accepted Answer

A bit is a single binary digit, while a byte is a group of 8 bits.

Answer

A byte is a single binary digit, while a bit is a group of 8 bytes.

Answer

A bit is a unit of data, while a byte is a unit of storage.

Answer

A byte is a unit of data, while a bit is a unit of storage.

Question 16

What is the purpose of a checksum?

Accepted Answer

To detect errors in data transmission or storage.

Answer

To encrypt data for security purposes.

Answer

To compress data to reduce file size.

Answer

To convert data from one format to another.

Question 17

Which data type is composed of small colored squares known as pixels?

Accepted Answer

Images

Answer

Text

Answer

Numbers

Answer

Sounds

Question 18

Which of the following is NOT a fundamental data type in computers?

Accepted Answer

Objects

Answer

Text

Answer

Numbers

Answer

Images

Question 19

Which of the following is a type of lossy compression?

Accepted Answer

JPEG

Answer

GIF

Answer

PNG

Answer

BMP

Question 20

What is the purpose of a checksum?

Accepted Answer

To ensure that data has not been corrupted during transmission

Answer

To encrypt data

Answer

To compress data

Answer

To store data

Question 21

Which of the following is NOT a data type commonly used in computers?

Accepted Answer

Acceleration

Answer

Text

Answer

Numbers

Answer

Images

Question 22

How are individual characters in a text file represented in a computer?

Accepted Answer

Using ASCII or Unicode codes

Answer

In the form of binary digits

Answer

As hexadecimal numbers

Answer

Through voice recordings

Question 23

Which of the following image compression techniques preserves the original quality of the image without any loss?

Accepted Answer

PNG

Answer

JPEG

Answer

GIF

Answer

MP4

Question 24

What is the hexadecimal equivalent of the decimal number 155?

Accepted Answer

9B

Answer

100

Answer

155

Answer

11110111

Question 25

What is the primary purpose of a data dictionary in database management?

Accepted Answer

To define the data types and structures used in a database.

Answer

To store the actual data in a database.

Answer

To create a visual representation of a database.

Answer

To manage user access and security for a database.

Question 26

What is the key difference between a primary key and a foreign key in a database table?

Accepted Answer

A primary key uniquely identifies each record in a table, while a foreign key references the primary key of another table.

Answer

A foreign key uniquely identifies each record in a table, while a primary key references the foreign key of another table.

Answer

A primary key can contain duplicate values, while a foreign key cannot.

Answer

A foreign key can contain duplicate values, while a primary key cannot.

Question 27

Which of the choices below is NOT a common data type used in computers?

Accepted Answer

Sunlight

Answer

Text

Answer

Numbers

Answer

Images

Question 28

What is the term for the process of converting an image into a digital format?

Accepted Answer

Digitization

Answer

Rasterization

Answer

Vectorization

Answer

Compression

Question 29

What advantage does lossless compression offer for images?

Accepted Answer

Preserved image quality

Answer

Reduced file size

Answer

Faster compression

Answer

Lower storage requirements

Question 30

Which of these is an example of a vector graphics format?

Accepted Answer

SVG

Answer

JPEG

Answer

PNG

Answer

GIF

Question 31

Which of the following is NOT a lossy compression technique?

Accepted Answer

PNG

Answer

JPEG

Answer

MP3

Answer

GIF

Question 32

Which of the following is **not** a common data type used in computers?

Accepted Answer

Energy

Answer

Text

Answer

Numbers

Answer

Images

Question 33

How are numbers typically represented inside computers?

Accepted Answer

Using binary code

Answer

Using decimal code

Answer

Using hexadecimal code

Answer

Using ASCII code

Question 34

What is the primary reason for converting data between different formats?

Accepted Answer

To make data compatible with different applications

Answer

To reduce storage space

Answer

To improve data security

Answer

To enhance data accuracy

Question 35

Which type of image is made up of a grid of colored pixels?

Accepted Answer

Raster image

Answer

Vector graphic

Answer

Text document

Answer

Sound file

Question 36

Which of the following is **not** a method of data validation?

Accepted Answer

Adding random data

Answer

Checking for data type

Answer

Checking for range

Answer

Checking for consistency

Question 37

Which of the following file extensions is commonly used to store images?

Accepted Answer

.jpg

Answer

.txt

Answer

.mp3

Answer

.doc

Question 38

What is the primary purpose of using lossless compression?

Accepted Answer

To reduce file size without losing any data

Answer

To increase file size for better quality

Answer

To convert data from one format to another

Answer

To encrypt data for security

Question 39

Which of the following is a vector graphics format?

Accepted Answer

.svg

Answer

.bmp

Answer

.gif

Answer

.mp4

Question 40

Which statement differentiates ASCII from Unicode?

Accepted Answer

Unicode supports more characters than ASCII

Answer

ASCII supports more characters than Unicode

Answer

ASCII is used for representing text while Unicode represents non-textual data

Answer

Unicode is a newer standard compared to ASCII

Question 41

What is the primary purpose of a database management system (DBMS)?

Accepted Answer

Organizing and managing data

Answer

Providing a user interface for data access

Answer

Protecting data from unauthorized access

Answer

Converting data from one format to another

Question 42

Which of the following is **not** a type of data used in computers?

Accepted Answer

Smell

Answer

Numbers

Answer

Text

Answer

Images

Question 43

What is a key advantage of using binary numbers to represent data?

Accepted Answer

Requires less storage space

Answer

Can represent any type of data

Answer

Easier to read and understand

Answer

More accurate than other number systems

Question 44

What is the key 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 mathematical shapes.

Answer

Vector images are better quality than raster images.

Answer

Raster images are larger in size than vector images.

Question 45

What is the primary purpose of quantization in audio representation?

Accepted Answer

Reducing the number of bits needed to represent the audio sample.

Answer

Converting the analog audio signal to digital.

Answer

Increasing the quality of the audio.

Question 46

Which of the following audio compression techniques results in some loss of sound quality?

Accepted Answer

MP3

Answer

FLAC

Answer

WAV

Answer

AIFF

Question 47

Which of the following is NOT a data type used in computers?

Accepted Answer

Smell

Answer

Numbers

Answer

Sound

Answer

Images

Question 48

How is text represented in computers?

Accepted Answer

ASCII or Unicode

Answer

Decimal

Answer

Hexadecimal

Answer

Binary

Question 49

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

Accepted Answer

MP3

Answer

JPEG

Answer

GIF

Answer

PNG

Question 50

How can sound be represented in computers?

Accepted Answer

Pulse-code modulation (PCM)

Answer

Amplitude modulation (AM)

Answer

MIDI

Answer

Frequency modulation (FM)

Question 51

Which of the following is a lossless compression method?

Accepted Answer

ZIP

Answer

MP3

Answer

JPEG

Answer

GIF

Question 52

What is the purpose of error correction codes?

Accepted Answer

To detect and correct errors that occur during data transmission or storage.

Answer

To compress data

Answer

To encrypt data

Question 53

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

Accepted Answer

Data destruction

Answer

Data transformation

Answer

Data sorting

Answer

Data filtering

Question 54

What is the role of a database management system (DBMS)?

Accepted Answer

To manage and organize data in a database

Answer

To process data

Answer

To store data

Answer

To display data

Question 55

What is the difference between data mining and data visualization?

Accepted Answer

Data mining analyzes data to discover patterns and trends, while data visualization presents data in a visual format.

Answer

Data mining is more complex than data visualization.