Data representation unit 3

Question 1

How is text represented in a computer?

Answer 1

Using character encoding systems like ASCII and Unicode.

Question 2

What is ASCII?

Answer 2

A code that represents text using 7 or 8 bits per character.

Question 3

What is Unicode used for?

Answer 3

To represent a wider range of characters from many languages around the world.

Question 4

What is a pixel?

Answer 4

The smallest point of colour in a bitmap image.

Question 5

What is colour depth (bit depth)?

Answer 5

The number of bits used per pixel to represent colour.

Question 5

How is bitmap image file size calculated?

Answer 5

File size = Width × Height × Colour depth (in bits) ÷ 8

Question 6

How is sound represented in a computer?

Answer 6

By sampling analogue sound waves at regular intervals and storing them in binary.

Question 7

What is sample rate?

Answer 7

The number of samples per second taken from an analogue sound.

Question 8

What is bit depth (for sound)?

Answer 8

The number of bits used to store each sample.

Question 9

How do sample rate and bit depth affect sound quality and file size?

Answer 9

Higher sample rate and bit depth = better quality and larger file size.

Question 10

What is a limitation of binary representation in sound?

Answer 10

Limited sampling frequency and bit depth can lead to lower sound fidelity.