1.2.4 Data Storage - OCR

How many colours can an image with a colour depth of 3 store?

• 2 colours

• 4 colours

• 8 colours

• 24 colours

How many colours can be displayed by an image with a colour depth of 2 bits?

• 2 colours

• 4 colours

• 8 colours

• 24 colours

What is the calculation to work out how many bytes a bitmap is?

• height * width * colour depth / 8

• height / width * colour depth / 8

• height - width + colour depth / 8

• height * width / colour depth / 8

Additional Information about the image file is stored as

• Metadata

• Properties

• File summary

• Pixels

What would be the colour depth of an image which can use up to 256 colours?

• 256 bit

• 8 bit

• 8 byte

• 256 byte

What is the sample rate?

• The number of times a sound wave is sampled per second

• The number of bits used to store each sample

• How loud a sound is

• The size of the sound wave

What is sample rate measure in?

• Bits

• Hertz

• GB

• amps

What is the formula for finding a sound files size?

• size = rate * resolution * seconds

• size = rate * resolution * minutes

• size = amplitude * bits * seconds

• size = sample * frequency * bits

What is the file size (in bits) of a sound with the following properties:

Sampling rate = 1,000Hz

Sample resolution = 16 bits

Length = 300 seconds

• 480 bits

• 4,800 bits

• 408,000 bits

• 4,800,000 bits

A sound has a file size of 17, 640 kilobytes. How much would this be in megabytes? (using 100kb instead of 1024kb for simple quicker math's)

• 1.76

• 17.64

• 176.4

• 1764