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1.2 Data Representation (Characters, Images, Sound, Compression)

Total questions: 35

Worksheet time: 25mins

Name
Class
Date
1.

How many bits are used in the ASCII character set?

a)

16

b)

1

c)

7

d)

8

2.

How many BYTES are used for the Unicode character set?

a)

8

b)

16

c)

1

d)

2

3.

The ASCII character set uses 16 bits per character

a)

TRUE

b)

FALSE

4.

The ASCII character set is capable of representing non-European languages

a)

TRUE

b)

FALSE

5.

A character set is...

a)

What language can be used by a computer system

b)

The fonts that a computer has installed

c)

The possible characters that can be represented by a computer system.

6.

ASCII can represent more characters than Unicode

a)

TRUE

b)

FALSE

7.

Each character in a character set is represented by a unique binary number

a)

True

b)

False

8.
Increasing the colour depth means…
a)
A bigger range of colours can be used for each pixel
b)
More pixels are in the image.
c)
More colours are in the image.
d)
Darker colours
9.
How many colours can be used for each pixel if the colour depth is 4 bit?
a)
4 colours
b)
5 colours
c)
15 colours
d)
16 colours
10.
How many colours can be used for each pixel if the colour depth is 8 bit?
a)
8 colours
b)
9 colours
c)
255 colours
d)
256 colours
11.
Reducing the amount of colours in the image will
a)
Reduce the quality of the image.
b)
Reduce the amount of binary needed for each pixel.
c)
Make the file size larger
d)
Remove pixels from the image.
12.
Which is NOT an example of metadata for an image file?
a)
Resolution
b)
Colour depth
c)
Camera used
d)
Sample rate
13.
Additional Information about the image file is stored as
a)
Metadata
b)
Properties
c)
File summary
d)
Pixels
14.
The number of pixels per inch in an image is known as the
a)
Dimensions
b)
Colour depth
c)
Resolution
d)
Megapixels
15.
Increasing the resolution of an image means that
a)
More pixels will be used to make up the image
b)
More colours will be used to make up the image
c)
The image size will be bigger
16.
The binary code for each pixel is used to determine
a)
Which colour will be displayed
b)
How big the image is
c)
What shape the image is
d)
How many pixels will be in the image
17.
Which is NOT an effect of increasing the resolution in an image?
a)
More colours can be displayed.
b)
More binary will be required to create the image.
c)
Larger file size
d)
Higher quality image
18.
How could you reduce the file size of an image?
a)
Reduce the numbr of colours used per pixel (colour depth)
b)
Reduce the dimensions of the image.
c)
Compress the file using a lossy compression file type.
d)
All of these
19.
Define the term "Resolution"
a)
The number of bits used per pixel (BPP).
b)
The number of colours used in an image.
c)
The number of pixels per inch (PPI).
d)
The total number of pixels in an image.
20.
How is all types of data represented in a computer?
a)
Sound
b)
Hex
c)
Binary
d)
English
21.
What is the process called for  converting analogue sound into binary (digital format)?
a)
Conversions
b)
Sampling
c)
Bit Rate
d)
Converting
22.
The height of a sound wave graph is related to what?
a)
Amplitude (loudness)
b)
Pace (speed)
c)
Key
d)
Tone
23.
What sample rate do most CDs have?
a)
44.1kHz
b)
50,000Hz
c)
40.2kHz
d)
4Hz
24.
What is bit depth?
a)
Number of bits assigned to each sample
b)
Rate at which the binary is calculated
c)
How deep the sound can go
d)
The speed of the sound wave
25.

What is the calculation to work out how many bytes a bitmap is?

a)

height * width * colour depth / 8

b)

height / width * colour depth / 8

c)

height - width + colour depth / 8

d)

height * width / colour depth / 8

26.

What is the formula for finding a sound files size?

a)

size = sample rate * bit depth * seconds

b)

size = sample rate * bit depts * minutes

c)

size = amplitude * bits * seconds

d)

size = sample * frequency * bits

27.

Tiny dots called ..... are the building blocks of all digital images.

a)
elements
b)
squares
c)
pixars
d)
pixels
28.
The following is true about sampling rates:
a)

They measure a number of recordings/snapshots of a sound wave taken per second.

b)
They are not as important as bit rates.
c)

They are the number of bits used to store each sound sample

29.

What is sample resolution or sample depth?

a)

The number of bits used to store each sample

b)

The number of times a wave is sampled per second

c)

How loud a sound is

d)

How quiet a sound is

30.
What is compression?
a)

Recording the amplitude of sound waves to create a digital sound file.

b)

Reducing the file size whilst trying to preserve quality.

c)

Scrambling data to prevent unauthorised access during transmission

d)

Rearranging files on a HDD so they are stored together sequentially

31.

Lossy Compression is…..?

a)

Usually performed on text

b)

When some original data is lost, and the original file cannot be re-created

c)

The original file can be re-created from the compressed file

d)

Turning the text into a format that only a reader with a key can decrypt it

32.

Lossless Compression is….?

a)

Usually performed on video files

b)

When some original data is lost and the original file cannot be re-created

c)

The original file can be re-created from the compressed file

d)

Turning the text into a format that only a reader with a key can decrypt it

33.

JPEG is which type of compressed file format?

a)

Lossy

b)

Lossless

34.

MP3 is which type of compressed file format?

a)

Lossy

b)

Lossless

35.

PNG is which type of compressed file format?

a)

Lossy

b)

Lossless

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