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9.1 Data Representation

Total questions: 31

Worksheet time: 18mins

Name
Class
Date
1.

What are the individual elements in the image called?

a)

Resolutions

b)

Pixels

c)

Sample frequency

d)

Images

2.

There are 448 individual elements in this image. What is this number called?

a)

Pixels

b)

Images

c)

Pictures

d)

Resolution

3.

This image allows two colours, therefore its colour depth is

a)

0

b)

1

c)

2

d)

11

e)

10

4.
The most common sampling rate for sound files is 44.1 khz.
a)
True
b)
False
5.
A microphone converts the changes in air pressure into voltage changes which are then digitised.
a)
True
b)
False
6.
The following is true about sampling rates:
a)
They measure a number of snapshots of sound taken per second.
b)
They are not as important as bit rates.
c)
They are different for every song, depending on its loudness.
7.
Identify a false statement:
a)
Higher bit rates usually improve the sound quality and result in smaller file size.
b)
Higher bit rates usually improve the sound quality but result in larger file size.
c)
To record a sound into binary format, ADC will be applied rather than DAC.
8.
Which of the following is not a usual way of reducing sound file size:
a)
Erasing metadata and keeping recordings short.
b)
Using lossy compression.
c)
Using lossless compression.
d)
Reducing sampling rate or bit rate.
9.
A bitmap image is made up of
a)
Pixels
b)
Colours
c)
Sounds
d)
Samples
e)
Characters
10.
The number of pixels per inch in an image is known as the
a)
Dimensions
b)
Colour depth
c)
Resolution
d)
Megapixels
11.
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
12.
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
13.
Most graphic formats create many colours from:
a)
Red, green, blue.
b)
Red, pink, yellow.
c)
Red, white, blue.
d)
Black, white, green.
14.

In a bitmap graphic each pixel is represented in _______

a)

Denary

b)

Binary

c)

Hexadecimal

d)

By letters

15.

An image with 4 colours will have a colour depth of:

a)

1

b)

2

c)

3

d)

4

16.

What is the colour depth of the image?

a)

colour depth of 1

b)

colour depth of 2

c)

colour depth of 4

d)

colour depth of 16

17.

A Byte consists of this many bits

a)

2

b)

4

c)

8

d)

16

18.

Which is larger?

a)

Bit

b)

Byte

19.

Every pixel on any image will have its own binary code?

a)

True

b)

False

20.

On an image each colour will have its own binary code?

a)

True

b)

False

21.

To calculate the file size of an image you:

a)

resolution (column * rows) *colour depth

b)

Number of colours used * resolution

c)

Resolution + colour depth

d)

Number of colours used + resolution

22.

Which of the following will increase the file size of an image?

a)

Increasing the colour depth

b)

Decreasing the colour depth

c)

Increasing the resolution

d)

Decreasing the resolution

23.

The sample interval is

a)

The time gap between taking a sample .e.g sampled every 5 milliseconds

b)

How many samples are taken in a second. 44.1khz means 44,100 are taken per second

c)

How many bits are recorded for each measurement

24.

The sample rate is

a)

The time gap between taking a sample .e.g sampled every 5 milliseconds

b)

How many samples are taken in a second. 44.1khz means 44,100 are taken per second

c)

How many bits are recorded for each measurement

25.

The sample size is

a)

The time gap between taking a sample .e.g sampled every 5 milliseconds

b)

How many samples are taken in a second. 44.1khz means 44,100 are taken per second

c)

How many bits are recorded for each measurement

26.

File size for sound is calculated as:

a)

sampling rate + Sample size + duration of clip

b)

sampling rate * Sample size * duration of clip

c)

sampling rate / Sample size / duration of clip

27.

An image with 5 rows and 4 columns of pixels with a colour depth of 1 (2 colours) will have a file size of how many bits...

a)

9

b)

20

c)

30

d)

90

28.

An image with 5 rows and 4 columns of pixels with a colour depth of 2 (4 colours) will have a file size of how many bits...

a)

9

b)

20

c)

40

d)

90

29.

An image with 5 rows and 4 columns of pixels with a total of three colours will have a file size of how many bits...

a)

9

b)

20

c)

40

d)

90

30.

A music clip that is has a sample rate of 10,000 samples per second with each sample having 10 bits in its total duration of ten second. What is the total file size for the clip (samples per second * sample size * duration)

a)

1,000 bits

b)

10,000, bits

c)

100,000 bits

d)

1,000,000 bits

31.

A music clip that is has a sample rate of 5,000 samples per second with each sample having 10 bits in its total duration of 20 second. What is the total file size for the clip (samples per second * sample size * duration)

a)

1,000 bits

b)

10,000, bits

c)

100,000 bits

d)

1,000,000 bits

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