Images and Sound on a Computer: revision quiz and key terms
Free practice for Images and Sound on a Computer in KS3 Computing (Years 7–9). It covers: pixels, resolution, colour depth, metadata and bitmap images; analogue vs digital sound, sampling, sample rate and bit depth; lossy vs lossless compression (JPEG, PNG, MP3, WAV). Try the questions, then check the key terms.
Try 5 free questions
Zara wants to email a holiday photo and keep the file small. Which format is best?
Increasing the bit depth of a sound file usually increases its file size.
Image A is 800 × 600 pixels. Image B is 1600 × 1200 pixels. Which statement is correct?
A lower sample rate gives a more accurate recording.
A sample rate of 44.1 kHz means how many samples are taken each second?
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Key terms for Images and Sound on a Computer
- Analogue
- A signal that changes smoothly and continuously, like a real sound wave.
- Colour depth
- How many 0s and 1s are used to store each tiny square's shade.
- Digital
- Stored as numbers, using only 0s and 1s.
- File size
- How much storage space a saved image or recording takes up, measured in bytes.
- JPEG
- A common photo file type that loses a little detail to save space.
- Megapixel
- One million tiny squares; used to describe a camera's detail.
- MP3
- A popular music file type that saves space by removing hard-to-hear sounds.
- Sampling
- Measuring a sound wave's height at regular moments so it can be stored.
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