c6 3-1 Character Sets and Images-GCSE Quiz

What is a character set?

• An image made up of a grid where each square is a pixel that can have a different colour.
• A type of character encoding that can use up to 32-bits.
• The number of bits we use per pixel affecting the number of colours that can be used by a computer.
• A defined list of characters and their associated codes recognised by a computer.

How many bits does ASCII use per character?

• 6
• 7
• 8
• 9

The ASCII binary code for the letter A is 01000001. What would the ASCII binary code be for B?

(a)  

The ASCII binary code for the letter A is 01000001. What would the ASCII binary code be for C?

(a)  

The ASCII binary code for the letter A is 01000001. What would the ASCII binary code be for D?

(a)  

In order to be able to represent characters from all the languages in the world, what character set should we use?

• ASCII
• Extended ASCII
• UNICODE
• Any of the above.

You have a text file that uses a 16-bit Unicode character set and is 200 characters in length. What is the size of the text file in bytes?

• 400 bytes
• 500 bytes
• 216 bytes
• 3200 bytes

If an image has an 8-bit colour depth, how many different colours can it support?

• 8
• 16
• 128
• 256

If a 0 is black and 1 is white, what is the correct binary sequence for the following bitmap?

• 101 101 101
• 010 010 010
• 111 000 111
• 000 111 000

You have an image with a resolution of 128 x 128 pixels and an 8-bit colour depth. What is the approximate size of the image in kilobytes?

• 1kb
• 8kb
• 16kb
• 24kb