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WorksheetsUNIT 2.6 DATA REPRESENTATION
Total questions: 50
Worksheet time: 17mins
Name
Class
Date
1.
Q1: What numeric base does Binary operate on? (1-4) ü
a)
2
b)
1
c)
8
d)
16
2.
Q2: How many bits are there in a byte? (1-4) ü
a)
8
b)
16
c)
1
d)
2
3.
Q3: What is the maximum number of bits needed to represent 15 in denary? (3-5)
a)
6
b)
4
4.
Q4: What is the 8 bit binary representation of 17? (5-7) ü
a)
10010
b)
10001
c)
1101
d)
100010
5.
Q5: What is the binary representation of 32? (5-7) ü
a)
100000
b)
100100
c)
110000
d)
100001
6.
Q6: What is the Denary representation of this 8 bit number? 01001111 (5-7)
a)
59
b)
79
c)
69
d)
49
7.
Q7: Q7: What is the Denary representation of this 8 bit number? 11010101 (5-7)
a)
199
b)
206
c)
228
d)
213
8.
Q8: How Bytes are there in a Terabyte? (5-7) ü
a)
1024 Kilobytes
b)
1024 Megabytes
c)
1024 Gigabytes
9.
Q9: Why do we use the binary number system in Computing? (4-6) ü
a)
Because a CPU has two transistors
b)
To represent the two different states of transistors
c)
To allow the CPU to be in one of two states
10.
Q10: What is the hex number 6B in binary? (6-8) ü
a)
1101011
b)
10101110
c)
1110111
11.
Q1: How many bits are used in ASCII? (1-4) ü
a)
16
b)
1
c)
7
d)
8
12.
Q2: How many Bytes are used in Unicode? (1-4) ü
a)
8
b)
16
c)
1
d)
2
13.
Q3: The ASCII code is represented by using 16 bits. (1-4) ü
a)
true
b)
false
14.
Q4: The ASCII is capable of representing non-European languages. (3-4) ü
a)
true
b)
false
15.
Q5: Upper and lower case letters have a different ASCII code? (3-4) ü
a)
true
b)
false
16.
Q6: What is the maximum number of values that can be represented in 8 bits? (4-6)
a)
16
b)
256
c)
65536
d)
128
17.
Q7: What is the maximum number of values that can be represented in 7 bits? (4-6)
a)
16
b)
256
c)
65536
d)
128
18.
Q8: A character set is… (4-6) ü
a)
What language can be used in a computer system
b)
The fonts that a computer has installed.
c)
Possible characters represented by a computer system
19.
Q9: ASCII can represent more characters than Unicode? (4-6) ü
a)
true
b)
false
20.
Q10: ASCII Stands for (6-7) ü
a)
American Standard Code for Information Interchange
b)
American Scientific Code for Information Interchanging
c)
Absolute Standard Codes for Instruction Interchange
21.
Q1: What do we call the smallest unit of data that can be represented in an image? (1-4)
a)
Pixel
b)
Dot
c)
Colour
d)
Bit
22.
Q2: What is meant by Colour Depth? (4-6)
a)
Number of pixels in the image
b)
The number of colours available for each pixel
c)
How pixelated the image is
23.
Q3: If you increase the colour depth then the file size will decrease? (4-6)
a)
true
b)
false
24.
Q4: How many colours can be represented with a 4 bit colour depth? (7-9) ü
a)
2
b)
4
c)
16
d)
256
25.
Q5: What term is used to define what must be known about a bitmap, to represent it accurately?
a)
Microdata
b)
Metadata
c)
Megadata
26.
Q6: In modern technology what unit of measurement would be used for screen size? (4-6)
a)
Pixels per inch (PPI)
b)
Dots per inch (DPI)
c)
Pixels per metre (PPM)
27.
Q7: Which of the following is not stored as Metadata about an image? (6-9) ü
a)
Height
b)
Colour Depth
c)
Resolution
d)
Number of people in the image
28.
Q8: Which of the following is not an image file? (4-6) ü
a)
PNG
b)
JPEG
c)
Bitmap
d)
MPEG
29.
Q9: What 3 colours are used to produce a broad array of colours in a computer system? (1-4)
a)
Green, Red, Orange
b)
Red, Green, Blue
c)
Yellow, Green, Red
30.
Q10: What is the name of the type of graphic that uses shapes of solid colour? (6-8)
a)
Raster
b)
GIF
c)
JPEG
d)
Vector
31.
Q1: What unit is sample rate measured in? (1-4) ü
a)
Bits per second (bps)
b)
Hertz (Hz)
c)
Megabits per second (Mbps)
32.
Q2: Which of the following is not true if you increase the sample rate? (3-6) ü
a)
Better quality of recording
b)
Needs greater storage space
c)
larger file size
d)
Decrease in quality
33.
Q3: What is meant by bit depth? (3-6) ü
a)
The number of samples taken per second
b)
The amplitude of each sample
c)
The number of bits used per second of audio
d)
The number of bits used to store each sound sample
34.
Q4: Which of the following is true if you decrease the bit rate? (3-6) ü
a)
File size increases
b)
Sound quality increases
c)
Sound quality decreases
d)
Number of sound samples taken per second increases
35.
Q5: What is measured when the wave is sampled? (3-6) ü
a)
Amplitude
b)
Hertz
c)
Bit rate
d)
Frequency
36.
Q6: What sample rate is used for CD quality sound? (6-8) ü
a)
44,100 Hz
b)
88,200 Hz
c)
22,100 Hz
37.
Q7: The purpose of a Digital to Analogue converter is to… (6-8)
a)
convert binary data into analogue form so we can hear it
b)
convert soundwaves to binary so its understood by a computer
38.
Q8: What piece of hardware would you use to input sound into a computer? (1-3)
a)
Speaker
b)
Analogue to digital converter
c)
Microphone
d)
Digital to analogue converter
39.
Q9: If you increase the bit depth of an audio file then you increase the
a)
quality? (1-4)
b)
ü
c)
true
d)
false
40.
Q10: The amplitude of a sound wave is… (6-9) ü
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
41.
Q1: What is compression? (1-4) ü
a)
To convert one file to another
b)
To reduce the size of data to save space
c)
To minimize the time taken for a file to be downloaded
d)
To compress something by pressing it very hard
42.
Q2: What does Lossy Compression do to files? (4-6) ü
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)
Remove unneeded data in a file to reduce file size
43.
Q3: What is Lossless Compression? (4-6) ü
a)
No information is lost but file size is increased
b)
There is no loss in information at all after compression
c)
Files which have the exact same data after compression
d)
Compression that involves an algorithm
44.
Q4: What type of compression does ZIP use? (7-9)
a)
Lossy
b)
Lossless
45.
Q5: What type of compression would you use to compress a video? (4-6) ü
a)
Lossy
b)
Lossless
46.
Q6: What type of compression would you use to compress a text file (4-6) ü
a)
Lossy
b)
Lossless
47.
Q7: When Lossy compression is used data is lost (1-4) ü
a)
Lossy
b)
Lossless
48.
Q8: Which of the following are not in a compressed format? (7-9) ü
a)
JPEG
b)
MPEG
c)
Bitmap
d)
MP3
49.
Q9: Uncompressed audio and video files require less memory than compressed files. (1-4)
a)
true
b)
false
50.
Q10: JPEG Stands for (4-6) ü
a)
Joint Photo Exempted Grade
b)
Joint Photographic Experts Group
c)
Junior Photographic Export Group
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