2024-25 - Y8 - Data Representation - Quiz 6

Which of these statements is NOT true about sound?

• Sound has to be converted from analogue to digital to be played on a computer
• A computer uses an Analogue to Digital converter
• A device to input sound on a computer is a microphone
• A device to output sound on a computer is a monitor

What is the height of a sound wave called?

• Aspect
• Adaptor
• Attachment
• Amplitude

Which of these best describes sampling?

• Taking an extract of text from a word document
• Taking away some pixels from an image
• Taking apart a binary number
• Taking measurements of a sound waves amplitude at regular intervals

Which of these best describes sampling rate?

• The pitch of sound
• The time period for a sound wave
• The number of samples are taken per second
• The frequency of a sound wave

What unit is sampling rate measured in?

• Bits per second (bps)
• Hertz (Hz)
• Megabits per second (Mbps)
• Frames per second (fps)

Which of these is NOT correct about the effect of increasing the sampling rate?

• Increasing the sampling rate means that the file size of the file will be increased
• Increasing the sampling rate means that more samples are taken per second
• Increasing the sampling rate means that the quality of the sound is reduced
• Increasing the sampling rate means that more of the original sound wave is sampled

Which of these best describes bit depth?

• The number of bits used to store each sound sample
• The amplitude of each sample
• The number of bits used per second of sound
• The number of samples taken per second

How many levels are available with a bit depth of 4 bits?

• 4
• 8
• 16
• 32

Which of these is NOT correct about the effect of increasing the bit depth?

• Increasing the bit depth means that the quality of the sound is increased
• Increasing the bit depth means that more levels are used to measure the amplitude per sample
• Increasing the bit depth means that the file size of the file will be decreased
• Increasing the bit depth means that the measurements of the sound waves amplitude are more accurate

Using the formula "file size (in bits) = sampling rate x bit depth x seconds", calculate the file size of this sound file: Duration-1 minute, Sampling Rate-10Hz, Bit Depth-5bits?

• 50 bits
• 100 bits
• 3,000 bits
• 19,200 bits