Y9 Data Representation

The type of compression which removes some of the data from a file in order to reduce its size is

• Lossy

• Lossless

• Lossleader

• Lost

How does lossy compression work with sound files?

• It removes background noise

• It removes sound humans can't hear

• It reduces the sampling size

• It filters the loudest sounds

What is each pixel in a bitmap image represented by?

• A binary code

• A hex value

• Machine code

How many colours can be represented in a 1 bit image

• 1

• 2

• 0

• 3

How many colours can be represented by a two bit image?

• 2

• 3

• 4

• 1

What is bit depth?

• The number of bits used to store a sample

• The size of a sound file

• The size of an image file

• An RGB value

Convert 11001001 to Denary.

• 199
• 200
• 201
• 202

Binary is a base two number system. What does this mean?

• That there are 10 possible states (0-9)
• That there are 16 possible states (0-9 and A-F)
• That there are 2 possible states (0 or 1)
• That the computer can only understand letters

What is the smallest unit of data in binary?

• A nibble
• A byte
• A bit
• A letter

How many bits are in a byte?

• 2
• 0
• 8
• 4