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Data Rep Quiz

Total questions: 23

Worksheet time: 11mins

Name
Class
Date
1.

Convert 1001 into decimal?

a)

8

b)

11

c)

12

d)

9

2.

What is colour/bit depth of the image?

a)

1

b)

2

c)

3

d)

4

3.

Left Binary Shifts

a)

Multiply

b)

Divide

4.

Moving one place left will

a)

Multiply numbers by 4

b)

Divide numbers by 4

c)

Multiply numbers by 2

d)

Divide numbers by 2

5.
Convert the Hex number DA to binary.
a)
11001010
b)
11011011
c)
11011010
d)
11011110
6.
Convert the binary number 01010101 to Hex
a)
44
b)
55
c)
66
d)
77
7.
Add binary numbers shown?
a)
01111011
b)
01101111
c)
01111101
d)
01101101
8.
True or False: The binary number for a capital 'A' is the same as the binary number for a lower-case 'a'?
a)
True
b)
False
9.

The word "Hello" is made up of 5 characters. How many bits is this (hint: how many 1's and 0's are needed to write it)

a)

40

b)

60

c)

80

d)

48

10.
A bitmap image is made up of
a)
Pixels
b)
Colours
c)
Sounds
d)
Samples
e)
Characters
11.
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
12.
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
13.
Define the term 'sample rate'.
a)
Snapshots of sound are taken as the wave cannot be represented as a series of continuous changes.
b)
The number of samples taken each second
c)
 The number of bits used per second of audio
d)
 The number of bits available for each clip
14.

How many bytes in a megabyte

a)

1000

b)

10,0000

c)

100,000

d)

1,000,000

15.
What is compression?
a)
To convert one file to another
b)
To reduce the size of data to save space
c)
To minimise the time taken for a file to be download
d)
To compress something by pressing it hard
16.

Which type of compression ensures that all of the data is kept?

a)

Lossless

b)

Lossy

17.

Which type of compression removes parts of the data?

a)

Lossy

b)

Lossless

18.

Compression makes file sizes...

a)

Bigger

b)

Smaller

c)

Keeps them the same

19.

Huffman trees use the _______________ of each character to work out their encoding.

a)

Frequency

b)

Order in ASCII

c)

Number value

20.

The correct encoding of the letter C in this tree is...

a)

11

b)

10

c)

01

d)

00

21.

How would you encode )xxxxx[;;;;;;;;;> using RLE.

a)

)1x5[1;9>1

b)

1)5x1[9;1>

c)

)x[;>

d)

1)6x1[6;1>

22.
When is Run Length Encoding used?
a)
When we want to compress patterns of data
b)
When we want to decompress patterns of data
c)
When we want to encode running videos
23.

The ASCII code is capable of representing non-European languages

a)

TRUE

b)

FALSE

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