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?

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

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

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