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Unit 2 Data Representation

Total questions: 57

Worksheet time: 35mins

Name
Class
Date
1.
Convert 128 to binary
a)

10000000

b)

01111110

c)

10000001

d)

11001100

2.
In computing, a bit is
a)
8 bytes
b)
a single    0 or 1     on or off
3.
A byte is
a)
8 bits
b)
4 bits
4.
The following is a correct order of units of storage from lowest to highest:
a)
a bit, a nibble, a byte, a kilobyte, a megabyte, a gigabyte, a terabyte
b)
a bit, a byte, a nibble, a kilobyte, a megabyte, a gigabyte, a terabyte
c)
a bit, a nibble, a byte, a megabyte, a kilobyte, a gigabyte, a terabyte
d)
a byte, a bit, a nibble, a megabyte, a kilobyte, a gigabyte, a terabyte
5.

Which is the smallest form of data?

a)

Bit

b)

Byte

c)

Nibble

d)

8 Binary Digits

6.

Which is larger?

a)

Megabyte

b)

Gigabyte

7.

Which is larger?

a)

Megabyte

b)

Kilobyte

8.

Convert 3 to binary

a)

10000001

b)

01111110

c)

00000011

d)

11001100

9.
Quality of an image depends on:
a)
Resolution
b)
Metadata
c)
Screen size
d)
Computer's speed
10.
Colour depth refers to:
a)
How many bits are used in a file to store colour information in every pixel
b)
Resolution divided by the number of colours in an image.
c)
Degree of file compression applied to an image file.
d)
Repeated resampling of an image.
11.
The smallest unit of data stored in an image file is called:
a)
Pixels
b)
Resolution
c)
Alpha
d)
Bitmap.
12.

A vector image is created using

a)

coloured pixels.

b)

dots.

c)

images.

d)

mathematics formulas.

13.

Bitmap graphics are made up of

a)

dots.

b)

images.

c)

mathematics formulas.

d)

coloured pixels.

14.
A character set is...
a)
What language can be used in a computer system.
b)
The fonts that a computer has installed.
c)
The possible characters that can be represented by a computer system.
15.
The (standard) ASCII code is capable of representing non-European languages.
a)
True
b)
False
16.
What is the maximum number of values that can be represented in 8 bits?
a)
255
b)
256
c)
65,536
d)
128
17.
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.
18.
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
19.
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
20.
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
21.

Convert the binary number 1001 to decimal.

a)

4

b)

5

c)

9

d)

11

22.

How many bits are in a nibble?

a)

8

b)

4

c)

2

d)

10

23.

What is the sample rate?

a)

The number of times a sound wave is sampled per second

b)

The number of bits used to store each sample

c)

How loud a sound is

d)

The size of the sound wave

24.

What is sample rate measure in?

a)

Bits

b)

Hertz

c)

GB

d)

amps

25.

What is used to convert a sound wave in to a digital format?

a)

A sound wave converter

b)

A router

c)

An amplitude to digital converter

d)

Analogue to digital converter

26.

What is amplitude?

a)

Number of samples taken

b)

The number of bits per sample

c)

The height of the sound wave

d)

The pitch

27.
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.
28.
How is sound caused?
a)
By playing it through a hi-fi with speakers
b)
Vibrations travelling through air, water or metal.
29.
What is the difference between analogue and digital data?
a)
Analogue is continuous data, whereas digital signals have two values, 0 and 1.
b)
Analogue has two values 0 and 1, whereas digital is continuous data.
30.

What characters does hexadecimal use?

a)

0- 9 then A-F

b)

0 - 10 then A-D

c)

1 - 9 then P-W

d)

1 - 10 then A-Z

31.

What does Hexadecimal 'A' equal in denary?

a)

8

b)

9

c)

10

d)

11

32.

What does Hexadecimal 'F' equal in denary?

a)

14

b)

15

c)

16

d)

17

33.

Hexadecimal is written using which Number Base system?

a)

2

b)

10

c)

16

d)

24

34.
Images can contain a geographical location of where the picture was taken. This is stored in a special area of an image file called:
a)
Metadata
b)
File name.
c)
Compression area.
d)
Alpha-channel.
35.
The following is true about metadata:
a)
It is data about data.
b)
It is corrupted data.
c)
It significantly increases file sizes.
36.

Convert the binary number to denary:

a)

64

b)

32

c)

96

d)

6432

37.

Convert the binary number to denary:

a)

2

b)

126

c)

128

d)

130

38.

Convert the binary number

10 00 01 00

a)

128

b)

4

c)

130

d)

132

39.

Convert the DECIMAL number

30

a)

00 01 00 10

b)

00 00 01 10

c)

00 01 11 10

d)

00 11 00 00

40.
a)
10100100
b)
10010100
c)
11000100
d)
01011110
41.
a)
10010000
b)
10001000
c)
10000100
d)
10100000
42.
a)
01111011
b)
01101111
c)
01111101
d)
01101101
43.

in Binary Addition Rules - What does 1 + 1 equal?

a)

0 carry the 1

b)

2

c)

1 carry the 1

d)

0

44.

in Binary Addition Rules - What does 1 + 0 equal?

a)

1

b)

0

c)

0 carry the 1

d)

1 carry the 1

45.

in Binary Addition Rules - What does 0 + 0 equal?

a)

0

b)

0 carry the 1

c)

1

d)

2

46.

in Binary Addition Rules - What does 1 + 1 + 1 equal?

a)

3

b)

0 carry the 1

c)

1 carry two 1s

d)

1 carry the 1

47.

True or False - Binary addition should be done one column at a time starting on the right?

a)

True

b)

False

48.

Convert Hex B2 to denary

a)

178

b)

165

c)

100

d)

59

49.

Convert Hex 4E to denary

a)

185

b)

99

c)

78

d)

54

50.

Convert Denary 95 to Hex

a)

DF

b)

5F

c)

63

d)

5A

51.

Convert Denary 255 to Hex

a)

11

b)

9F

c)

FD

d)

FF

52.

Which logic gate is this?

a)

AND

b)

OR

c)

NOT

d)

NAND

53.

Which logic gate is this?

a)

OR

b)

AND

c)

NOT

d)

NOR

54.

Which logic gate is this?

a)

OR

b)

AND

c)

NOT

d)

NOR

55.

What will this gate's output be?

a)

1

b)

0

56.

What type of logic gate is this table showing?

a)

NOT

b)

OR

c)

AND

d)

NAND

57.

What type of logic gate is this table showing?

a)

OR

b)

AND

c)

NOT

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