WorksheetsYear 10 DIG Theory Class Quiz
Total questions: 60
Worksheet time: 30mins
What is the main difference between lossy and lossless compression?
Lossy compression removes some data permanently, while lossless compression allows all data to be restored.
Lossy compression is slower than lossless compression.
Lossless compression always results in a smaller file than lossy compression.
Lossy compression is only used for text files.
What is the definition of compression?
The process of reducing the size of something by pressing or squeezing it.
The process of expanding the size of something by pulling it apart.
The process of changing the color of an object.
The process of heating an object to increase its temperature.
What is the main purpose of compression in computing?
To make file sizes smaller
To increase the number of files
To delete unnecessary files
To change file formats
Which of the following best describes compression?
A technique used to make file sizes smaller
A method for increasing file security
A process for duplicating files
A way to organize files alphabetically
Why might someone use compression on their files?
To reduce the amount of storage space needed
To make files harder to find
To change the file type
To increase the file size
Which of the following is a type of data compression?
Lossy Compression
Data Encryption
File Fragmentation
Data Mining
What are the two main types of compression?
Lossy Compression and Lossless Compression
Data Compression and File Compression
Image Compression and Video Compression
Secure Compression and Fast Compression
If you need to compress a file without losing any data, which type of compression should you use?
Lossless Compression
Lossy Compression
Secure Compression
Fast Compression
Which type of image compression retains all the original data and quality?
Lossless
Lossy
Progressive
Interlaced
What is a visible effect of lossy image compression compared to lossless compression?
Lossy compression results in reduced image quality
Lossy compression increases image sharpness
Lossy compression adds more colors
Lossy compression makes the image larger in file size
If you need to preserve every detail of an image for editing purposes, which compression method should you choose?
Lossless
Lossy
Encrypted
Fragmented
What is lossy compression?
A compression technique that allows certain content to be ignored without losing significant fidelity or content.
A method of increasing the size of a file by adding extra data.
A way to store information without any loss of data.
A process that duplicates information to ensure accuracy.
Which of the following best describes the main purpose of lossy compression?
To reduce file size by ignoring some information while maintaining significant fidelity or content.
To increase the quality of the original file.
To ensure that no information is ever lost.
To make files larger for easier storage.
Why might lossy compression be used instead of lossless compression?
To achieve a smaller file size by allowing some less important information to be ignored.
To guarantee that every bit of original data is preserved.
To make files more difficult to open.
To increase the amount of data stored in a file.
What is a key characteristic of lossy compression algorithms?
Some information may be lost
All information is perfectly preserved
Files always become larger
They only work with text files
Which of the following is an advantage of using lossy compression over lossless compression?
It can produce much smaller files
It always increases image quality
It never loses any information
It is only used for audio files
In which situation is lossy compression most appropriate to use?
When the difference after compression isn’t very noticeable
When every bit of information must be preserved
When compressing executable programs
When compressing encrypted data
How do lossy compression algorithms often take advantage of human anatomy?
By removing information humans can’t easily detect
By increasing the number of colors in an image
By making files larger for better quality
By only compressing text data
Why might we not notice the loss of some information in a lossy compressed image?
Because we can’t tell the difference between certain values of color
Because lossy compression always improves image quality
Because lossy compression only affects file size, not content
Because our computers automatically restore lost data
Which of the following is an advantage of file compression?
Quality can be reduced significantly.
Quicker to send, move, and store files.
Inferior copy to original file.
Unknown byte/pixel relationship.
What is a disadvantage of file compression?
Can achieve smaller compression on file.
Much higher audio and video compression ratio.
Quality can be reduced significantly.
You can pre determine the amount of compression.
Which statement best explains why file compression might not be suitable for all file types?
Compression can only be used for audio files.
Some file types may not support compression methods.
Compression always improves file quality.
Compression is only used for video files.
Suppose you need to send a large video file quickly over the internet. Which advantage of compression would be most beneficial in this scenario?
Inferior copy to original file.
Unknown byte/pixel relationship.
Quicker to send, move, and store files.
Quality can be reduced significantly.
If you were to explain the effect of reducing the percentage from 50% to 5% in these images, which of the following best describes what happens?
The image becomes clearer and more detailed
The image becomes more pixelated and loses detail
The colors in the image become brighter
The size of the image increases
What is the main characteristic of lossless compression?
It reduces the size of information without losing any original content.
It permanently deletes some parts of the information.
It increases the size of the information.
It only works for images and videos.
Which of the following best describes the purpose of lossless compression?
To code information so that its size is reduced while preserving all original content.
To make information unreadable to unauthorized users.
To convert information into a different format.
To increase the speed of internet connection.
Why might someone choose lossless compression over other types of compression?
To ensure that no original content is lost during compression.
To make files larger for easier storage.
To remove unnecessary information permanently.
To change the format of the information.
What happens to an image after it is compressed and then uncompressed using a lossless compression algorithm?
The image is exactly the same as the original
The image loses some quality
The image becomes larger in size
The image changes color
Which of the following is true about lossless compression?
No information is lost during compression
Some information is lost during compression
The image quality is reduced
It is rarely used
Why might someone choose to use a lossless compression algorithm instead of a lossy one?
To ensure that no information is lost in the image
To make the file size as small as possible, regardless of quality
To change the colors in the image
To make the image blurry
Which of the following is an advantage of the compression method described in the material?
Maintains the original file
Compression ratio is very high
Results in a smaller file than lossy compression
Irreversible process
Which statement best explains why this compression method is considered reversible?
The original file can be restored after decompression.
The file is permanently changed after compression.
Only image files can be compressed.
The compression ratio is always perfect.
If you need to compress a file without losing any data, which advantage of this method would be most important?
Maintains the original file
Compression ratio not as good
Large file compared to lossy compression
Irreversible
Why might someone choose a lossy compression method instead of the one described in the material?
To achieve a smaller file size
To maintain higher end quality and finish
To ensure the process is reversible
To compress data of any kind
Which type of image compression reduces the file size the most in the given comparison?
Original
Lossless
Lossy
None of the above
What is the main difference between lossless and lossy image compression as shown in the image?
Lossless compression reduces file size more than lossy
Lossy compression reduces file size more but may reduce image quality
Lossless compression always increases file size
Lossy compression keeps the image quality the same as the original
If you need to keep the image quality as close to the original as possible, which compression method should you choose based on the image?
Lossy
Lossless
Both are the same
None of the above
What is a file format in the context of storing images?
A way of storing an image
A type of computer virus
A method for printing documents
A programming language
Explain how file formats impact the way images are stored or transmitted. Use reasoning to support your answer.
File formats determine how images are converted into bits, which affects how they are stored or transmitted.
File formats only change the color of images, not how they are stored.
File formats are used to print images, not store or transmit them.
File formats have no impact on image storage or transmission.
Why is it important to know different file formats when working with computers?
To choose the correct software to open files
To improve computer speed
To increase internet speed
To reduce electricity usage
Which of the following is a common image file format?
.bmp
.mp3
.wav
.zip
Which file format is typically used for compressed folders or archives?
.gif
.zip
.jpeg
.png
If you want to save a sound recording, which of the following file formats would you most likely use?
.wav
.png
.gif
.bmp
A student wants to share a high-quality photo online. Which file format from the list would be most suitable for this purpose?
.mp3
.jpeg
.zip
.wav
You are creating an animated image for a website. Which file format would you most likely use?
.gif
.mp3
.zip
.wav
Which file format from the list is commonly used for audio files and is known for compressing sound data?
.mp3
.png
.bmp
.gif
Compare the file formats .png and .jpeg. Which one is better suited for images that require transparency?
.jpeg
.png
.mp3
.zip
A teacher wants to send multiple documents in a single file to students. Which file format should they use to compress and package the files?
.zip
.wav
.bmp
.gif
Which of the following best describes the difference between vector and raster (Bitmap) graphics?
Vector graphics are made of pixels, while raster graphics are made of lines
Vector graphics are made of mathematical paths, while raster graphics are made of pixels
Raster graphics are always black and white, while vector graphics are always colored
Raster graphics are used for text, while vector graphics are used for photos
What are bitmap graphics made up of?
Pixels
Lines
Vectors
Shapes
In bitmap graphics, what does each tiny square dot represent?
A shape
A colour
A line
A texture
How do the dots in bitmap graphics form an image?
By being arranged in rows
By combining into patterns
By being colored randomly
By overlapping each other
What does a bitmap graphics program define?
The file size and format
Which pixel will be which colour and the dimensions of the image
The type of device used
The speed of rendering
Explain how a bitmap graphics program determines the appearance of an image. (DoK Level 2)
By selecting random colours for each pixel
By defining which pixel will be which colour and setting the image dimensions
By using only black and white pixels
By ignoring pixel arrangement
Imagine you are designing a bitmap image. What steps would you take to ensure the image displays the correct colours and dimensions? (DoK Level 3)
Assign colours to each pixel and specify the width and height of the image
Use only one colour for all pixels
Ignore the arrangement of pixels
Let the computer randomly choose colours
Which type of image file is dependent on resolution and may show "jaggies" or become blurred when resized?
Bitmap
Vector
SVG
GIF
What happens to a bitmap image when its size is increased?
It may show visible pixels and jaggies or become blurred
It becomes sharper and clearer
It automatically adjusts without quality loss
It changes to a vector image
Bitmap files are limited to which shape, even if the image appears transparent?
Rectangle
Circle
Triangle
Hexagon
Any image that is scanned or comes from a digital camera is what type of file?
Raster file
Vector file
Text file
Audio file
Explain why size changes can greatly affect the quality of a bitmap image's final print.
Because resizing can cause pixelation or blurring due to resolution dependency
Because bitmap images automatically improve in quality when resized
Because bitmap images are always sharp regardless of size
Because bitmap images convert to vector format when resized
