# Computing: Representing Data

0.0 / 5

HideShow resource information

- Created by: kaliSerene
- Created on: 22-04-16 09:39

What number system do modern computers work in?

Binary

1 of 45

What is binary?

A number system with just two symbols: 0 and 1

2 of 45

What is binary made up of?

Data and instructions

3 of 45

What is each digit in binary called?

A bit Binary digIT

4 of 45

What is a kilobyte?

1024 bytes

5 of 45

What is a terabyte?

1024 gigabytes

6 of 45

What is a byte?

8 bits

7 of 45

What is a gigabyte?

1024 megabytes

8 of 45

What is a nibble?

4 bits

9 of 45

What is a megabyte?

1024 kilobytes

10 of 45

If you were adding a binary number and a column had 1 and 1, what would be the answer?

Write 0 and carry 1

11 of 45

If you were adding a binary number and a column had 1 and 0, what would be the answer?

Write 1 and carry 0

12 of 45

If you were adding a binary number and a column had 0 and 0, what would be the answer?

Write 0 and carry 0

13 of 45

All the symbols displayed by a computer are represented by a code. What does a computer do when it wants a symbol to be displayed?

The computer looks up the symbol matching the code from a list of codes and their associated characters. The list of codes and matching characters is the character set for the computer.

14 of 45

What are the codes used stored in?

Binary

15 of 45

What determines how many characters or symbols can be used?

The number of bits used to store the code

16 of 45

What does ASCII use?

7 bits, 127 characters or symbols plus the null character (128 in total)

17 of 45

What does Extended ASCII use?

8 bits, 256 characters or symbols

18 of 45

What is Unicode?

Can provide a character set for a computer that includes a wide range of specialist symbols. ASCII could be considered a subset of Unicode as Unicode keeps the original 127 ASCII codes.

19 of 45

What does UNICODE use?

16 bits, 65,000 possibilities or 32 bits providing over 4 billion possibilities

20 of 45

When we sort words in ASCII, what word would come first: 'zebra' or 'apple'?

Zebra

21 of 45

On a computer, images are stored as what?

Many binary values

22 of 45

How is the computer able to work out how to turn these binary values into the image?

The file with the binary data contains metadata (data about the data).

23 of 45

What is a pixel?

One tiny square of the image.

24 of 45

What does the number of bits we use for a pixel determine?

How many colours each pixel can represent. 1 bit can represent just two colours, 2 bits can represent 4 colours, 8 bits can represent 256 colours, 16 bits can represent 65,536 colours

25 of 45

The more bits per pixel (bpp), the...

...greater the colour depth and the more bits we need to store the data.

26 of 45

What is 16 bpp called?

High colour

27 of 45

What is 24 bpp called?

True colour

28 of 45

What does resolution mean?

The number of pixels per unit.

29 of 45

The more pixels per inch, the...

...more data to be stored and the large file needed to store the image.

30 of 45

What happens if a bitmapped image is enlarged on the screen?

The image size does not change. The pixels become bigger and the image becomes pixelated or 'blocky'.

31 of 45

How many colours can be represented using a 4-bit colour depth?

16

32 of 45

What are the main factors effecting the size of the file needed to store an image?

The resolution, the size and the colour depth.

33 of 45

What are sound files described by?

Metadata to make sure the computer can interpret the data accurately

34 of 45

What does the data stored include?

Audio codec, sample rate.

35 of 45

What needs to be done to sound to get it transferred to a computer?

Needs to be converted from analogue to digital

36 of 45

What is a sample interval?

Describes the sample rate, the time between samples being taken. The higher the sample interval the lower the sample rate.

37 of 45

When sound is sampled at a low rate it...

Very few samples are taken. There is a poor match between the original sound and the sampled sound, a small file size is required.

38 of 45

When sound is sampled at a high rate it...

Many more samples are taken, there is a good match between the original sound and the sampled sound, a large file size is required.

39 of 45

What is the bit rate?

The amount of space used for each sample.

40 of 45

What does a higher bit rate mean?

More accurate sampling at each point which gives better quality, more data needs to be stored which needs a larger file size

41 of 45

What happens when a computer is instructed to run a program?

The computer is directed to a specific location in memory that contains the first instruction in the program.

42 of 45

The CPU fetches the instruction and decodes it in order to find out what to do next. What is the instruction made up of?

The operator: instruction part, and the operand: data part.

43 of 45

What is the accumulator?

A special register in the CPU used to store the results of any calculation.

44 of 45

What can the CPU not tell the difference between?

Data and instructions which simple deals with what it finds according to what it expects to find.

45 of 45

## Other cards in this set

### Card 2

#### Front

What is binary?

#### Back

A number system with just two symbols: 0 and 1

### Card 3

#### Front

What is binary made up of?

#### Back

### Card 4

#### Front

What is each digit in binary called?

#### Back

### Card 5

#### Front

What is a kilobyte?

#### Back

## Similar Computing resources:

0.0 / 5

0.0 / 5

3.0 / 5

1.0 / 5

0.0 / 5

0.0 / 5

4.5 / 5

4.5 / 5

## Comments

No comments have yet been made