1.2 Text, Sound, and Images Cambridge IGCSE 0478

How many bits are used in standard ASCII to represent a character?

• 7 bits

• 8 bits

• 16 bits

• 32 bits

What is the main advantage of Unicode over ASCII?

• It supports a wider range of characters, including different languages.

• It requires fewer bits per character.

• It is faster to process than ASCII.

• It uses fewer characters than ASCII.

What does a computer do to store text data?

• It converts characters into binary using a character set.

• It stores characters as sound waves.

• It compresses the text into an image format.

• It stores text in hexadecimal directly.

How is sound converted into a digital format?

• A sound wave is sampled at regular intervals and stored as binary data.

• The entire sound wave is stored without any modification.

• The sound is converted into text before storage.

• The sound is directly stored as ASCII characters.

What does a higher sample rate in sound recording do?

• Increases sound quality but also increases file size.

• Decreases sound quality and reduces file size.

• Reduces the number of bits used per sample.

• Makes the sound play at a lower pitch.

What does colour depth refer to in an image?

• The number of bits used to represent each pixel’s colour.

• The number of pixels in an image.

• The number of colours used in an image.

• The number of times an image can be compressed.

Which of the following correctly describes image resolution?

• The number of pixels in the image, typically width × height.

• The number of colours an image can display.

• The number of bits required to store the image.

• The speed at which the image loads on a screen.

What is the effect of increasing both resolution and colour depth of an image?

• The image quality improves, but the file size increases.

• The image quality worsens, and the file size decreases.

• The image remains the same, but it becomes harder to display.

• The image loads faster but looks blurry.

What unit is used to measure sample rate in digital audio?

• Hertz (Hz)

• Bits per second (bps)

• Megabytes (MB)

• Frames per second (fps)

What happens if an image’s colour depth is reduced?

• The number of available colours decreases, and the image may look less detailed.

• The resolution of the image increases.

• The image becomes brighter and sharper.