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OCR GCSE Computer Science: Data Representation

Total questions: 50

Worksheet time: 17mins

Name
Class
Date
1.

What is the smallest unit of data in computing?

a)

Kilobyte

b)

Nibble

c)

Bit

d)

Byte

2.

How many bits are there in a byte?

a)

8

b)

4

c)

16

d)

32

3.

What is a nibble equivalent to?

a)

2 bytes

b)

4 bits

c)

8 bits

d)

1 byte

4.

What does binary data represent in computers?

a)

Hexadecimal numbers

b)

Decimal numbers

c)

Analogue data

d)

None of the above

5.

What device converts analogue signals to digital data?

a)

Analogue-to-Digital Converter

b)

Signal Processor

c)

Binary Converter

d)

Digital-to-Analogue Converter

6.

How many bytes are in 1 kilobyte?

a)

2048

b)

500

c)

1024

d)

1000

7.

What is the binary system also known as?

a)

Base 8

b)

Base 16

c)

Base 2

d)

Base 10

8.

What is the unit used to measure large quantities of data, which is larger than a terabyte?

a)

Kilobyte

b)

Petabyte

c)

Megabyte

d)

Gigabyte

9.

What is the primary form in which data is stored in a computer?

a)

Decimal

b)

Hexadecimal

c)

Binary

d)

Analogue

10.

What is the term for a unit of data containing 8 bits?

a)

Nibble

b)

Byte

c)

Word

d)

Bit

11.

What does ADC stand for?

a)

Analogue Data Conversion

b)

Analogue-to-Digital Converter

c)

Audio Digital Converter

d)

Advanced Data Conversion

12.

Which of the following is not a type of data?

a)

Integer

b)

Character

c)

Boolean

d)

Formula

13.

What is used to convert a digital signal back to an analogue signal?

a)

DAC

b)

ADC

c)

GPU

d)

CPU

14.

How many kilobytes are in one megabyte?

a)

1000

b)

1024

c)

100

d)

500

15.

What does the term 'binary digit' refer to?

a)

Byte

b)

Bit

c)

Baud

d)

Block

16.

Is 'real' sound analogue or digital?

a)

Analogue

b)

Digital

17.
A pixel is the _______ part of an image.
a)
Smallest
b)
Largest
18.

How does a higher picture resolution effect quality & file size?

a)

Quality is improved as there is more detail, file size is larger

b)

Quality is worse, as there is less detail but a smaller file size.

19.
Each pixel is displayed using a combination of what three colours?
a)
Blue, green and purple
b)
Red, grey and white
c)
Red, green and blue
d)
White, red and blue
20.
Define what is meant by the term 'metadata'.
a)
Metadata is the smallest element of an image.
b)
Metadata is the number of bits used to store the colour of a pixel.
c)
Metadata refers to information stored about an image.
d)
Metadata is a lossy compression file format that allows for very compact file sizes.
21.
Which of the following is NOT metadata that could be stored about an image?
a)
Pixel width and height.
b)
Picture resolution measured in DPI
c)
Camera name and model.
d)
Printer description
22.
What formula is used to calculate the file size of an image without knowing the DPI?
a)
Width of pixels x Height of pixels x colour depth.
b)
Width of pixels x Height of pixels x 8
23.

An image is 50 pixels wide by 20 pixels high.  The colour depth is 2 bit, what is the file size in bits?

a)

20 bits

b)

200 bits

c)

2000 bits

d)

20000 bits

24.

Define what is meant by the term 'colour depth'

a)

The number of pixels in an image, width*height, measured by dpi.

b)

The number of bits used to encode each pixel and thus the number of available colours

25.

How does a higher colour depth i.e. 16 bit instead of 4 bit effect quality & file size?

a)

Quality is improved as there are more colours available per pixel but file size is larger

b)

Quality is worse, as there are less colours available per pixel but a smaller file size.

26.
How is sound caused?
a)
By playing it through a hi-fi with speakers
b)
Vibrations travelling through air, water or metal.
27.
The amplitude of a sound wave is....
a)
How high the wave is from the crest or trough
b)
The frequency at which it is sampled
c)
The speed at which it travels through air
28.

Define what is meant by 'sampling'

a)

Height of the wave is measured, at intervals and stored as binary.

b)

The number of samples taken each second

c)

 The number of bits used per second of audio

d)

The amount of information required to describe one second of a sound.

29.
Define the term 'sample rate'.
a)

Height of the wave is measured, at intervals and stored as binary.

b)

The number of samples taken each second

c)

 The number of bits used per second of audio

d)

The amount of information required to describe one second of a sound.

30.

Define what is meant by 'bit depth'

a)

Height of the wave is measured, at intervals and stored as binary.

b)

The number of samples taken each second

c)

 The number of bits used per second of audio

d)

The amount of information required to describe one second of a sound.

31.
Which three factors affect the quality of an audio clip?
a)
Bit rate and bit depth
b)
Bit rate, bit depth and number of pixels
c)
Sample rate, analogue, number of pixels
d)
Sample rate, bit rate and bit depth
32.
How does sample rate affect the quality of an audio clip and file size?
a)
The higher the bit depth, the higher the quality of the audio, but the larger the file size
b)
The more bits that are sampled the better the accuracy of the file but also the greater the file size. 
c)
Greater the frequency of the samples, the better the sound quality.
33.

Define what is meant by the term 'character set'?

a)

All the characters recognised/can be represented by a computer.  Each character has a number.

b)

A set of characters in Disney

34.

How many bits (0s and 1s) are used in ASCII?

a)

7

b)

8

c)

9

d)

16

35.
How many bits are used in Unicode?
a)
7
b)
8
c)
9
d)
16
36.
How many characters can be encoded using 8 bit extended ASCII?
a)
128
b)
256
c)
512
d)
65536
37.
How many characters can be encoded using 16 bit Unicode?
a)
128
b)
256
c)
512
d)
65536
38.
Why was Unicode developed in 1991?
a)
To improve the character sets on computers
b)
Needed so we could display non-printing characters
c)
There was a need for a universal standard and more characters to cover all languages on earth.
d)
To replace early character sets used on teletype and teleprinting machines
39.

ASCII, Extended ASCII and Unicode are Standards for inputting data into a computer - True or False?

a)

True

b)

False

40.
Convert the Hex number 1F to binary.
a)
00111111
b)
00001111
c)
00010111
d)
00011111
41.
Convert the Hex number B9 to binary.
a)
10111001
b)
10111000
c)
10111101
d)
10101001
42.
What is 98 in hexadecimal
a)
62
b)
98
c)
AB
d)
69
43.
What is 184 in hexadecimal
a)
B8
b)
B4
c)
10111000
d)
9A
44.

What is D in binary

a)

1111

b)

1101

c)

1011

d)

0111

45.

Why is hexadecimal used by humans

a)

It is easier to read

b)

it takes up less space on the page/screen

c)

it is easier to remember

d)

It is easier to type

e)

It saves space on the computer

46.
What does Lossy Compression do to files?
a)
Increases the file size and keeps the same quality
b)
Eliminates no information at all
c)
Decreases the file size and keeps the same quality
d)
Eliminates unnecessary information in a file to reduce file size
47.
What is Lossless Compression?
a)
No information is lost but file size is increased
b)
There is no loss of information at all after compression
c)
Files which have the exact same data after compression
d)
Compression involves an algorithm
48.
What type of compression would you use to compress a video?
a)
Lossy
b)
Lossless
49.
What type of compression would you use to compress a text file?
a)
Lossy
b)
Lossless
50.
Which of the following are not in a compressed format?
a)
JPEG
b)
MPEG
c)
Bitmap
d)
MP3

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