Computing Year 10 Mid Years Spec

What base is decimal?

10

What base is binary?

2

What base is hexadecimal?

16

What is binary?

a system where numbers and values are represented as 0 or 1

Why do computers use binary?

To represent all data and instructions

Why is hexadecimal often used in computer science?

-Large numbers can be represented in fewer digits

-it is easier for humans to understand, write and check than binary.

How many columns on a nibble table?

4

How many columns on a byte table?

8

What does a small b represent?

bit

What does a big B represent?

byte

What range can represented in 8 bits?

0 to 255

What is a bit?

fundamental unit of information

1KB/kilobyte is

1000 bytes.

1MB/megabyte is

1000 kilobytes

1GB/gigabyte is

1000 megabytes

1TB/terabyte is

1000 gigabytes

What is a character set?

A collection of characters that a computer recognises from their binary representation

What is ASCII?

7 bit code that can hold 128 characters

What is Unicode?

16 bit code that can hold 65,536 characters

Advantage of ASCII over Unicode

Takes up less storage

Advantage of Unicode over ASCII

Has more characters

Unicode uses the same codes as ASCII up to ...

127