# 2.1 Units And Binary Numbers Flashcards

1
Q

What is binary

A

A base 2 number system. It has 2 states power on = 1, power off = 0

2
Q

How is data stored on a computer?

A

Data such as images, text files etc., are stored in binary

3
Q

1 bit

A

Single 0 or 1

4
Q

1 byte

A

8 bits (1 char of text)

5
Q

1 nibble

A

4 bits or half a byte

6
Q

1 kB

A

1000 bytes

7
Q

1 MB

A

1000 kB

8
Q

1 GB

A

1000 MB

9
Q

1 TB

A

1000 GB

10
Q

1 PB

A

1000 TB

11
Q

Give the order of size of bytes

A
• Kilo
• Mega
• Giga
• Tera
• Peta
12
Q

How much space does 2 char of text take?

A

1 byte

13
Q

How much space does a full page of text take?

A

30 kB

14
Q

How much space does a small digital colour take?

A

3 MB

15
Q

How much space does a Music CD have?

A

650 mB

16
Q

DVD Capacity

A

4.5GB

17
Q

Hard disk capacity

A

1 TB

18
Q

How do you work out the combination of number of bits

A

2^n

19
Q

What base is denary?

A

10

20
Q

What base is binary?

A

Base 2

21
Q

In a byte of data which bit is the most significant?

A

The MSB is the bit furthest to the left. In a byte the MSB has a value of 128

22
Q

In a byte of data which bit is the least significant

A

The LSB is the bit furthest to the right.

23
Q

Convert 28 into binary in 1 byte

A

00011100

24
Q

What is the largest value that can be stored in a byte?

A

255

25
Q

How do you calculate the largest value with a certain amount of bits being n?

A

2^n-1