Y10 Quiz Digital Data

Which of the following would not be suitable for Lossy Compression?

• Images

• Music

• Videos

• Text

You would use ______ compression if you still needed to have a high quality image

• Lossy

• Lossless

The correct encoding of the letter C in this tree is...

• 11

• 10

• 01

• 00

Huffman trees use the _______________ of each character to work out their encoding.

• Frequency

• Order in ASCII

• Number value

How do you move through a Huffman tree?

• 0 = right 1= left

• 1 = left 2 = right

• 0 = left 1 = right

• 0 = middle 1 = back

How do you calculate the number of bits of a body of text in ASCII?

• Number of characters * 7

• Number of characters (including spaces) *7

• bits in Huffman * 7

• bits in Huffman / 7

Uncompressed audio and video files require less memory than compressed files

• True

• False

Which of the following are not in a compressed format?

• JPEG

• MPEG

• Bitmap

• MP3

How many bits are used to store the word PIT using ACSII?

• 3

• 21

• 28

• 1

How many bits will be used to store the word PIT when compressed with Huffman?

• 21

• 3

• 8

• 9