Cambridge AS Level Computer Science: Multimedia

What is a bit-map image?

• A system that uses pixels to make up an image.

• A system that uses only lines and curves to make up an image.

• A system that uses only text to make up an image.

• A system that uses only sound to make up an image.

If an image has a resolution of 4096 x 3192 pixels, what does this mean?

• The image is made up of 4096 pixels in width and 3192 pixels in height.

• The image is made up of 4096 colours.

• The image is made up of 3192 sound samples.

• The image is made up of 4096 frames per second.

Explain the difference between image resolution and screen resolution using your own words.

• Image resolution is the number of pixels in an image, while screen resolution is the number of pixels a screen can display.

• Image resolution is the number of colours in an image, while screen resolution is the number of screens an image can be shown on.

• Image resolution is the number of bits per pixel, while screen resolution is the number of colours a screen can display.

• Image resolution and screen resolution are the same thing.

What is the pixel density (ppi) of an Apple iPhone 8 with a 5.5-inch screen and a resolution of 1920 × 1080 pixels?

• 2202 ppi

• 1920 ppi

• 401 ppi

• 1080 ppi

What is a key advantage of vector graphics when resizing images?

• They do not lose quality when scaled up

• They become blurry when enlarged

• They require more storage space

• They cannot be resized

According to the comparison table, why do vector graphic images not require large file sizes?

• They are made up of simple geometric shapes

• They use a lot of pixels

• They are always very realistic

• They use high image resolution

When deciding between using a vector graphic or a bit-map image, which factor should be considered if the image needs to look very realistic?

• Bit-map images are usually the best option

• Vector graphics are always more realistic

• File size is not important

• Vector graphics are always the best option

Why might it be necessary to convert a vector graphic to a bit-map image before printing?

• To match the format of most printers

• To reduce the file size

• To make the image less realistic

• To increase the number of geometric shapes

What is required for sound to travel from one place to another?

• A medium

• A vacuum

• Only air

• Only water

What does the amplitude of a sound wave specify?

• The loudness of the sound

• The pitch of the sound

• The speed of the sound

• The direction of the sound