Assessment - Revision Q2

What form must data be in for a computer to be able to process it?

• 
  Binary

• 
  Denary

• 
  Binary or denary

What code can be used to convert text into binary?

• 
  Python

• ASCII code

• 
  Binary code

How many characters can the ASCII code store?

• 129

• 
  128

• 
  266

What is included in the ASCII code?

• Just letters and numbers

• 
  Just letters

• Any key on a normal keyboard

What is metadata?

• Data that isn't needed

• 
  Data that gives information about other data

• 
  Data that is saved for later use

What does an analogue to digital converter do?

• Samples a sound wave at regular intervals then converts these to binary

• Makes an image smaller

• 
  Assigns binary code to text

Why would an image be compressed?

• 
  To increase its quality

• 
  To change the colours it contains

• 
  To make it smaller to store

What does lossy compression do?

• Compresses by discarding data that is thought to be unnecessary

• 
  Increases the quality of a file

• Compresses by breaking the file down into smaller parts for storage then putting them back together again when opened

What does lossless compression do?

• Compresses by discarding data that is thought to be unnecessary

• 
  Increases the quality of a file

• Compresses by breaking the file down into smaller parts for storage then putting them back together again when opened

What is a popular method for lossy compression of images?

• 
  MPEG

• JPEG

• 
  TIF