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Calculating audio and video file sizes

Quiz by GCSE Computer Science Teacher 2

GCSE (AQA)
Computer Science
English National Curriculum

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12 questions
Show answers
  • Q1
    Which of these do we not need to know in order to calculate a file size?
    Sample rate
    Channels
    File name
    Seconds (length of recording)
    30s
    3.3.7.b
  • Q2
    Which of these is the correct formula for calculating sample rate?
    Frequency × sample resolution × seconds = sample rate
    (Frequency × sample resolution) × channels = sample rate
    Frequency + sample resolution + channels = sample rate
    Frequency × sample resolution / channels = bit rate
    60s
    3.3.7.b
  • Q3
    What is the correct formula for calculating the file size of an audio file?
    (Sample rate x resolution ) / sample length = file size
    Sample rate / resolution x sample length = file size
    Sample rate + resolution + sample length = file size
    (Sample rate x resolution) x sample length = file size
    60s
    3.3.7.b
  • Q4
    What is 1,411,200 bits per second in kbps?
    1,411.2 kbps
    14.11 kbps
    1.411 kbps
    14,112 kbps
    60s
    3.3.7.b
  • Q5
    To find out the sample rate of 100 second recording with file size of 12, 000 bits and a sample resolution of 8 bits, which equation is correct?
    (12,000 / 8) x 30 = 1,500 Hz
    (12,000 / 30) / 8 = 50 Hz
    (12,000 * 8) / 30 = 3200 Hz
    (12,000 / 30) x 30 = 12, 000 Hz
    60s
    3.3.7.b
  • Q6
    How do you convert a measurement in bytes to bits?
    Divide the number of byes by 10
    Multiply the number of bytes by 10
    Divide the number of bytes by 8
    Multiply the number bytes by 8
    60s
    3.3.7.b
  • Q7
    How do you convert a measurement of bits to megabytes
    Bits / 8 = bytes. bytes / 1000 = megabytes
    Bits / 8 = bytes. bytes / 100,000 = megabytes
    Bits x 8 = bytes. bytes / 100,000 = megabytes
    Bits / 8 = bytes. bytes / 10,000 = megabytes
    60s
    3.3.7.b
  • Q8
    What is 160,000 bytes in kilobytes?
    16 Kb
    1.60 Kb
    1,600 Kb
    160 Kb
    60s
    3.3.7.b
  • Q9
    What is 160,000 bytes in megabytes?
    1.6 Mb
    16 Mb
    0.016 Mb
    0.0016 Mb
    60s
    3.3.7.b
  • Q10
    What impact does compressing an audio file have on its file size?
    It will be reduced
    It will stay the same but be a lower quality
    It will be increased
    It will stay the same but be better quality
    60s
    3.3.7.b
  • Q11
    As well as the file size, what else is changed during lossy compression?
    The sample rate is decreased
    The length of the recording is shorter
    The sample rate is increased
    The bits used is increased
    60s
    3.3.7.b
  • Q12
    How does reducing the sample rate decrease the file size?
    The file length is shortened in the process
    More bits are needed to store the sample
    Less storage is needed as there is a smaller file length
    Less bits are needed to store the samples
    60s
    3.3.7.b

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