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WorksheetsData Representation - The Big One
Total questions: 45
Worksheet time: 25mins
How many bits are used in ASCII?
16
1
7
8
This character set uses between 8 and 32 bits per character, so it can represent characters from languages from all around the world.
(a)
The ASCII code is represented by using 16 bits
True
False
The ASCII is capable of representing non-European languages
True
False
Upper and lower case letters have a different ASCII code?
True
False
What is the maximum number of values that can be represented in 8-bits?
16
256
128
65,536
What is the maximum number of values that can be represented in 7-bits?
16
256
128
65,536
A character set is...
What language can be used in a computer system
The fonts that a computer has installed.
The possible characters that can be represented by a computer system
ASCII can represent more characters than Unicode?
True
False
ASCII Stands for
(a)
Which character set can represent English text using the least storage space?
ASCII
Extended ASCII
Unicode
Which of these character sets allows the largest number of different characters?
ASCII
Extended ASCII
Unicode
What is a pixel?
A picture element - the small dots that make up an image
How an image is stored on the computer.
A type of image
A special type of photograph
Quality of an image depends on:
Resolution
Metadata
Screen size
Computer speed
The density of pixels in an image file is known as:
Resolution
Dimensions
Transparency
Compression
The smallest unit of data stored in an image file is called:
Pixels
Resolution
Alpha
Bitmap
Increasing the colour depth means…
A bigger range of colours can be used for each pixel
More pixels are in the image
More colours are in the image
Darker colours
Reducing the colour depth of an image will ......
Improve the quality of the image
Reduce the amount of binary needed for each pixel
Make the file size larger
Remove pixels from the image
Increasing the resolution of an image means that
More pixels will be used to make up the image
More colours will be used to make up the image
The image size will be bigger
Fewer pixels will be used to make up the image
Tiny squares called (a) are the building blocks of all digital images.
Which one of the following answers best describes a limitation of this colour depth?
Only a few colours can be displayed
The system could not be used for simple computer games
Only 1 colour can be displayed
Only 2 colours can be displayed
How many colours is the bottom picture showing given that it is using 4 bit colour depth?
16 colours
4 colours
256 colours
5 colours
In a bitmap graphic each pixel is represented in (a)
What is the colour depth of the image?
colour depth of 1
colour depth of 2
colour depth of 4
colour depth of 16
Why do bitmap images often appear blocky if you enlarge them too much?
Because there is only a limited amount of detail in the bitmap image
Because of rounding errors in the calculations for the coordinates and formulae being used to draw the image
Because adding new pixels to the image would take up all of the computer's memory as you zoom in
What does 'dpi' mean?
The number of colours supported by the image format
The number of dots that can be plotted each second on a screen or printer
The number of dots used per horizontal inch in the image
What does DPI stand for?
(a)
What is the smallest colour depth (in bits) that would be needed to store this image?
(a)
This bitmap image uses a colour depth of 8 bits. What are the maximum number of colours that can be used?
(a)
Most computer systems and digital cameras use 24-bit images. How many colours can be used?
65,536
16,777,215
4,294,967,296
16,384
Calculate the image file size, using the information given in the metadata.
**Give your answer in KB to 1dp**
(a)
Calculate the image file size, using the information given in the metadata.
**Give your answer in KB to 1dp**
(a)
