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WorksheetsImages & Sounds Representation - E.O.T Quizz
Total questions: 103
Worksheet time: 52mins
What does the binary system use to represent data?
Numbers 1–9
Letters A–Z
Only two digits, 0 and 1
Symbols
Which of the following is represented in binary using ASCII?
Images
Letters and characters
Sounds
Colours
The letter ‘A’ is represented in binary as 01000001. What is this system called?
Bitmap
Unicode
ASCII
Binary shift
What is a bitmap image made up of?
Mathematical equations
Coloured pixels
Sound waves
Binary digits only
What is a pixel?
A group of bits
The smallest unit of a digital image
A colour code
A binary file
What does the term “bit” stand for?
Binary item
Binary digit
Binary text
Binary tool
What does colour depth measure?
The height and width of an image
The number of bits used to represent each pixel
The brightness of colours
The number of bytes in a file
How many colours can be represented by 3 bits per pixel?
4
6
8
16
What formula is used to calculate the number of colours?
Width × Height
2n
Height ÷ Width
n + 2
Which of the following provides the most colours?
1-bit colour
4-bit colour
8-bit colour
2-bit colour
What does image resolution measure?
The number of bytes in a file
Pixel density (dots per inch)
Colour combinations
File speed
What happens when pixels are smaller?
The image becomes blurrier
Fewer pixels fit on the screen
Pixel density increases
The image file size decreases
Section 6: Metadata — What is metadata?
Data about the image, such as width, height, and colour depth
A type of colour code
A way to compress files
The image background
Section 6: Metadata — Why is metadata important?
It stores colour depth only
It helps the computer display the image correctly
It adds sound to an image
It increases resolution
What formula is used to calculate bitmap file size?
Width × Height × Colour Depth
Width + Height × Colour Depth
Width × Colour Depth ÷ Height
Width ÷ Colour Depth
If an image is 10 pixels wide, 8 pixels high, and uses 4 bits per pixel, what is the file size?
400 bits
80 bits
40 bits
800 bits
Increasing colour depth and resolution will:
Decrease the image quality
Reduce file size
Increase file size
Have no effect
Why do digital photographers often use 24-bit colour depth?
It reduces image clarity
It allows more than 16 million colours
It takes up less space
It uses grayscale only
Which statement about bitmap and vector images is true?
Bitmaps are made up of pixels; vectors use mathematical formulas
Vectors use pixels; bitmaps use formulas
Both are pixel-based
Both lose quality when resized
Why might a graphic designer choose a vector image format for company branding?
It uses fewer colours
It scales without losing quality
It’s easier to store in binary
It has smaller resolution
What happens to the file size if you double the image resolution but keep colour depth the same?
It stays the same
It doubles
It halves
It becomes black and white
Which statement best summarises image representation?
Images are stored using sound waves
Images are stored in binary as either bitmaps or vectors
Images are made of letters and digits
Images cannot be represented digitally
What two factors mainly affect image file size?
Resolution and colour depth
Height and width only
Binary and ASCII
Bit and pixel
Computers store and process data using ________ code, made up of 0s and 1s.
binary
decimal
ASCII
hexadecimal
ASCII is used to represent:
Colours
Images
Characters and symbols
Sound waves
Which 8-bit ASCII binary code represents the uppercase letter A?
01000001
01100001
01000010
00100001
Bitmap images are made up of:
Pixels
Numbers
Sounds
Letters
Vector images are made up of:
Pixels
Mathematical formulas
Binary digits
Text characters
Match the term Bitmap to its correct description.
Made of pixels
Drawn using mathematical formulas
Data about an image (e.g., width, height)
Smallest part of an image
Match the term Vector to its correct description.
Made of pixels
Drawn using mathematical formulas
Data about an image (e.g., width, height)
Smallest part of an image
Match the term Metadata to its correct description.
Made of pixels
Drawn using mathematical formulas
Data about an image (e.g., width, height)
Smallest part of an image
Match the term Pixel to its correct description.
Made of pixels
Drawn using mathematical formulas
Data about an image (e.g., width, height)
Smallest part of an image
A ________ image stores the mathematical instructions to draw shapes.
vector
bitmap
raster
pixel
State one advantage of using vector images over bitmap images.
They can be resized without losing quality
They use a fixed pixel grid
They always have larger file sizes at small dimensions
They contain a fixed resolution that cannot change
Each pixel in a bitmap represents:
A shape
A sound
A colour
A number
The more pixels an image has:
The lower the resolution
The smaller the file size
The higher the resolution
The fewer colours it can display
The smallest unit of a digital image is called a ________.
pixel
byte
vector
sample
In a 1-bit image, how many colours can be shown?
1
2
4
8
Explain why bitmap images can become blurry when resized.
Each pixel is enlarged, causing loss of detail
Vector mathematics improves clarity when enlarged
Metadata changes the file type during resizing
Colour depth automatically decreases when resizing
What is colour depth?
The number of colours in an image
The number of bits used per pixel
The image resolution
The file size
What is the formula to calculate the number of colours?
Width × Height
2n
Height + Width
8 × bits
How many colours can a 2-bit image display?
2
4
8
16
The greater the ________, the more colours an image can display.
colour depth
resolution
width
brightness
A 24-bit image can display how many colours?
65,536
16.7 million
256
1024
What does image resolution measure?
Image brightness
Pixel density
Colour variation
File type
Resolution is often measured in:
Pixels per inch (ppi)
Bits per second
Bytes per pixel
Hertz
Higher resolution means more ________ per inch, leading to clearer images.
pixels
bytes
colours
bits
Explain why increasing resolution improves image quality.
More pixels capture more detail
It reduces colour depth automatically
It lowers file size, removing compression artifacts
It changes the file type to a clearer format
What does metadata store?
The binary code for colours
Information about the image
Sound data
Mathematical shapes
Which of the following is included in image metadata?
File name only
Width, height, and colour depth
Only colour palette
File type and size only
Metadata helps computers reconstruct an image by using its ________ and ________.
width and height
colour depth and brightness
file name and type
resolution and ppi
Why is metadata important when opening an image file?
It tells the computer how to display the image correctly
It compresses the image automatically
It changes the colour palette to default
It converts bitmap images to vector format
What formula is used to calculate image file size?
Width × Height × Colour Depth
Width + Height + Colour Depth
Width × Depth ÷ Height
Height × 2n
An image is 20 pixels wide, 10 pixels high, and 8 bits per pixel. What is its file size?
200 bits
800 bits
1,600 bits
2,000 bits
Increasing colour depth will:
Reduce image quality
Increase file size
Lower resolution
Reduce brightness
The more bits used per pixel, the larger the ________ of the image.
file size
resolution
width
height
Explain the trade-off between image quality and file size.
Higher quality images require more storage space due to higher resolution and colour depth
Higher quality images take up less storage due to efficient pixels
File size is unrelated to image quality
Lower resolution always gives better colour depth
Which image type is best for photographs?
Bitmap
Vector
ASCII
Metadata
Which image type is best for drawings and logos?
Bitmap
Vector
JPEG
PNG
What does DPI stand for?
Data Per Image
Dots Per Inch
Display Pixel Index
Digital Pixel Information
A high DPI value means the image has more units per inch. Select all that apply.
dots
pixels
layers
kilobytes
Why do graphic designers use vector images for company branding?
They can scale images without losing clarity.
They are pixel-based and show more texture.
They always have more colours than bitmap formats.
They export as smaller files in every case.
Which of the following statements is true?
Vector images are pixel-based.
Bitmap images can be scaled infinitely.
Metadata defines an image’s dimensions.
Colour depth is measured in bytes only.
What happens if you increase both the colour depth and resolution?
File size decreases
File size increases
Image becomes distorted
Colour palette shrinks
What is a bit?
A group of eight bytes.
A single binary digit, either 0 or 1.
A small file used to store music.
A type of sound wave.
What is a sample in sound processing?
The whole sound file from start to finish.
A measurement of the sound wave at a specific moment in time.
The loudest part of a sound clip.
Any random part of a song chosen by the user.
What is an analogue signal?
A signal that only has two possible values.
A continuous signal that can take any value within a range.
A type of digital file used for music.
A signal that only exists inside a computer.
What is a digital signal?
A continuous signal that changes smoothly.
A random set of sounds produced by a speaker.
Data represented using discrete values, usually 0s and 1s.
Any signal that travels through the air.
Which statement best describes real-world sound waves?
They are digital, made up of 0s and 1s.
They are analogue, varying continuously over time.
They are always stored as MP3 files.
They can only have two volume levels: loud or quiet.
Why do we need to convert sound from analogue to digital?
So it can be heard by humans.
So it can be transmitted through air.
So a computer can store and process it using binary.
So it becomes louder automatically.
What does ADC stand for in this topic?
Audio Data Compaction
Analogue-to-Digital Conversion
Advanced Digital Coding
Automatic Data Control
Which device is a common example of something that performs analogue-to-digital conversion?
Printer
Monitor
Microphone with an audio interface
Headphones
What is sample rate?
The number of bits used to store each sample.
The loudness of the sound measured in decibels.
The number of samples of the sound taken each second.
The length of the sound clip in minutes.
What is the unit for sample rate?
Bits per second (bps)
Bytes (B)
Hertz (Hz)
Kilobytes (KB)
A typical CD audio file has a sample rate of 44,100 Hz. What does this mean?
44,100 bits are used to store each sample.
The sound lasts for 44,100 seconds.
44,100 samples of the sound are taken every second.
The volume is fixed at 44,100 decibels.
What is bit depth (sample resolution)?
The number of sound files stored on a CD.
The number of bits used to store each individual sample.
The size of the speaker used to play the sound.
The total number of seconds in the recording.
What effect does a higher bit depth usually have?
Lower sound quality and smaller file size.
Better sound quality but larger file size.
No change in quality or file size.
Quieter sound but faster playback.
CD-quality sound uses 16 bits per sample. What does this allow?
Only 256 possible amplitude values.
Exactly 16 amplitude levels.
65,536 different amplitude values can be represented.
An unlimited number of amplitude values.
What is duration in a digital sound file?
The number of bits in each sample.
The number of samples taken per second.
The length of the recording measured in seconds.
The highest frequency in the recording.
How does increasing the duration of a sound recording affect file size (with other factors fixed)?
File size decreases because the sound is stretched.
File size stays exactly the same.
File size increases because more samples are taken.
File size becomes zero because the sound is compressed.
Which formula is used to calculate the size of an uncompressed sound file in bits?
File size = sample rate × duration
File size = bit depth × duration
File size = (sample rate × bit depth × duration)
File size = (sample rate + bit depth + duration)
In the formula for sound file size, what does sample rate represent?
How many bits are used per sample.
How many samples of the sound are taken each second.
The total number of bits in the file.
How many channels the sound has.
In the same formula, what does bit depth represent?
The number of samples taken during the whole recording.
The number of bits used to store each sample.
The number of files stored on the device.
The speed of the computer processor.
A sound is recorded at 44,100 Hz, 16-bit, for 10 seconds, mono (1 channel). Which statement is TRUE about its file size?
Increasing the duration to 20 seconds would reduce the file size.
Reducing the sample rate would reduce file size but also reduce quality.
Increasing bit depth from 16-bit to 24-bit would make the file smaller.
Changing nothing will change the file size each time it is played.
Which change will usually give better quality sound but also a larger file size?
Lower sample rate and lower bit depth.
Higher sample rate and lower bit depth.
Higher sample rate and higher bit depth.
Lower sample rate and higher bit depth.
Which combination of factors will always increase the size of a digital sound file?
Higher sample rate, higher bit depth, longer duration.
Lower sample rate, lower bit depth, shorter duration.
Lower sample rate, higher bit depth, shorter duration.
Higher sample rate, lower bit depth, shorter duration.
Which of these best explains sampling?
Turning text into sound.
Measuring the height (amplitude) of the sound wave at regular time intervals.
Storing sound as a single very large number.
Playing a recording faster to save space.
What happens if the sample rate is too low?
The file will not save.
The sound will be completely silent.
The playback may sound distorted or lose detail compared to the original.
The volume automatically increases.
Which of the following is TRUE about increasing the sample rate?
Quality improves and file size increases.
Quality gets worse but file size increases.
Quality improves and file size decreases.
Quality stays the same but file size decreases.
A sound is sampled at 22,050 Hz instead of 44,100 Hz, with all other factors the same. What is the main effect?
The file will be exactly twice as large.
The file size will roughly halve, but quality may be lower.
The file will not play on speakers.
The bit depth will automatically increase.
Which option correctly matches term to definition?
Bit depth – number of samples taken per second.
Sample rate – number of bits used to store each sample.
Duration – the length of the recording in time.
Analogue – data stored as 0s and 1s.
Which device mainly does Digital-to-Analogue Conversion (DAC)?
Microphone
Keyboard
Speaker or headphones
Scanner
Why does a higher bit depth give more accurate sound?
More bits mean more possible amplitude values.
More bits make the sound play faster.
More bits reduce the number of samples per second.
More bits remove the need for sampling completely.
Which of these is the BEST description of bit rate for audio?
The number of files stored on a hard drive.
The number of bits processed or transmitted per second.
The number of minutes in a song.
The number of channels (mono or stereo).
A mono recording is made at 11,025 Hz, 8-bit, for 20 seconds. Which change would most clearly increase quality?
Reduce sample rate to 5,000 Hz.
Reduce bit depth to 4-bit.
Increase bit depth to 16-bit while keeping sample rate the same.
Shorten the duration to 10 seconds.
A student says: “If I double the sample rate AND double the bit depth, the file size will stay the same.” How should you respond?
“You’re right; sample rate doesn’t affect file size.”
“You’re wrong; the file size will increase because both factors are larger.”
“You’re right; duration is the only thing that changes file size.”
“You’re wrong; file size will go to zero.”
Which of these is an advantage of storing sound digitally instead of as analogue?
Digital sound can only be played once.
Digital sound can be copied, edited and shared without degrading quality.
Digital sound can never be compressed.
Digital sound cannot be sent over the internet.
Two sound files have the same duration. File A has a higher sample rate and higher bit depth than File B. What is MOST likely true?
File A has better quality but a larger file size.
File A has worse quality but a larger file size.
File A has the same quality and size as File B.
File A will not play on any device.
What is the usual effect of compression (for example, MP3) on an audio file?
Makes the file bigger but quieter.
Reduces file size, sometimes with a small loss in quality.
Increases file size without changing anything.
Deletes the file after playing it once.
A sound is recorded at 48,000 Hz, 16-bit, for 5 seconds, mono. Which factor would NOT change the file size?
Increasing the duration to 8 seconds.
Reducing the sample rate.
Changing from mono to stereo.
Using different lyrics but keeping the same technical settings.
Which statement about analogue vs digital is correct?
Analogue signals are continuous; digital signals use discrete values like 0s and 1s.
Analogue signals are always binary; digital signals are always continuous.
Both analogue and digital signals are stored the same way in a computer.
Digital signals cannot be processed by a computer.
A track is recorded in stereo instead of mono with the same sample rate, bit depth, and duration. What happens to the file size?
It roughly doubles.
It stays exactly the same.
It becomes half.
It becomes zero.
Which combination would give the SMALLEST uncompressed file size (assume same duration, mono)?
48,000 Hz, 24-bit
44,100 Hz, 16-bit
22,050 Hz, 16-bit
22,050 Hz, 8-bit
