03 Text and Images

What of the following are character sets that can be used to represent text?

• ASCII
• Unicode

• MP3

• JPEG
• Bitmap

How many characters could be represented by the original 7-bit ASCII system?

How many bits does extended ASCII use for 1 letter or character?

• 8

• 7

• 2

• 10

ASCII can represent more characters than Unicode?

• True

• False

The letter "A" is represented by the number 65 in ASCII. What would the sequence 66, 65 and 71 represent in ASCII?

• BAD

• CAFE

• BAG

• AGE

Which of the following statements are true?

• A bitmap is a type of digital image.

• Text and bitmaps are both represented on a computer using binary.

• Text files are usually smaller than bitmaps because they use less bits.

• ASCII can represent all written languages, including all symbol based languages such as Chinese, Japanese and Arabic.

• Text files are usually bigger than bitmaps because they use less bits.

What is a pixel?

• A single unit of a digital image with a single colour.

• A single unit of a digital image with multiple colours.

• A unit to measure the size of binary number.

• The number of colours in a digital image.

What is a bitmap?

• An image file that is made up of pixels.

• A type of number system that uses 0s and 1s to represent whole numbers.

• A file that represents text characters.

• The number of colours in a digital image.

Colour Depth and Number of Colours are the same thing.

• True

• False

What is the difference between colour depth and number of colours.

• There is no difference, they mean the same thing.

• Colour depth is the number of bits per pixel, number of colours is how many colours each pixel could show.

• Number of colours is the number of bits per pixel, colour depth is how many colours each pixel could show.

• Number of colours is how many primary colours are available, colour depth is how many shades of each one of those colours there can be.