# Homework 7 data representation

## Quiz by sharon Hockley

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8 questions
• Q1
What is bit rate?
the number or bits stored in each audio sample
the number of bits used to store the colour of the pixel
The number of bits used per second of audio
number of pixels in an image
30s
• Q2
Calculate how many different colours a 5 bit image can use
32
16
5
10
30s
• Q3
All bitmap images have some form of metadata
True
False
30s
• Q4
What is colour Depth?
The number of different colours available
the size of the image
The number of bits used for each pixel
the number of samples taken a second
30s
• Q5
What is meant by the term sampling frequency?
The number of samples taken per second
the length of the audio track
the number of samples taken per minute
the number of bits used to record each sample
30s
• Q6
What is the formula that relates bit rate, sample frequency and sample size?
Sampling frequency = Bit rate x Sample size
Bit rate = sample size / sampling frequency
Bit rate = sampling frequency x Sample size
Sample Size = Sampling frequency x Bit rate
30s
• Q7
What does compressing a file mean?
Improving the quality of the file
Increasing the size of the file
Reducing the size of the file
Always keeping the original quality of the file
30s
• Q8
Lossless compression temporarily removes data
True
False
30s

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