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CS Y7 > Master Deck > Flashcards

Master Deck Flashcards

1
Q

<p></p>

<p>Computers use a \_\_\_\_\_\_\_ number system</p>

A

<p></p>

<p>binary</p>

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2
Q

<p></p>

<p>Humans use a \_\_\_\_\_\_\_\_\_ number system</p>

A

<p></p>

<p>denary</p>

<div><div></div></div>

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3
Q

<p></p>

<p>Binary is also known as \_\_\_\_\_\_\_</p>

A

<p></p>

<p>base 2</p>

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4
Q

<p></p>

<p>Denary is also known as \_\_\_\_\_\_\_\_</p>

A

<p></p>

<p>base 10</p>

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5
Q

<p></p>

<p>Binary (base 2) is made up of the numbers....</p>

A

<p></p>

<p>0 and 1</p>

<p>zero and one</p>

<div><div></div></div>

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6
Q

<p></p>

<p>Denary is made up of the numbers....</p>

A

<p></p>

<p>0 to 9</p>

<p>zero to nine</p>

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7
Q

<p></p>

<p>What are the data units from smallest to largest?</p>

A

<p></p>

<p>bit</p>

<p>nibble</p>

<p>byte</p>

<p>kilobyte</p>

<p>megabyte</p>

<p>gigabyte</p>

<p>terabyte</p>

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8
Q

<p></p>

<p>What are examples of data?</p>

A

<p></p>

<p>text/words</p>

<p>sounds</p>

<p>images</p>

<p>numbers</p>

<p>video</p>

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9
Q

<p></p>

<p>Computers take \_\_\_\_\_ and \_\_\_\_\_\_ it into \_\_\_\_\_\_\_\_\_</p>

A

<p></p>

<p>Computers take <strong>data </strong>and <strong>process </strong>it into <strong>information</strong>.</p>

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10
Q

<p></p>

<p>What is an algorithm?</p>

A

<p></p>

<p>An algorithm is a set of steps to solve a problem</p>

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11
Q

<p><br></br>8 bits =</p>

A

<p></p>

<p>1 byte</p>

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12
Q

<p></p>

<p>A computer process stores data using \_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_\_ that can be ON or OFF</p>

A

<p></p>

<p>A computer process stores data using <strong>electrical switches</strong>that can be ON or OFF</p>

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13
Q

<p></p>

<p>What are the 8-bitbinary placeholder values?</p>

A

<p></p>

<p>128 / 64 / 32 / 16 / 8 / 4 / 2 / 1</p>

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14
Q

<p></p>

<p>How do you convert a binary number to denary?</p>

A

<p></p>

<p>Find all the placeholders with 1s in them and add those placeholders up. The answer is the denary number.</p>

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15
Q

<p></p>

<p>A shorter way to write <strong>b</strong>inary dig<strong>it</strong> is \_\_\_\_</p>

A

<p></p>

<p>bit</p>

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16
Q

<p></p>

<p>What are 3 facts about a bit?</p>

A

<p></p>

<p>The smallest piece of computer memory</p>

<p>A single on/off switch inside a computer's electronic memory</p>

<p>A single 1 or 0</p>

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17
Q

<p></p>

<p>A kilobyte is 1024 bytes and will store about....</p>

A

<p></p>

<p>half a page of text</p>

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18
Q

<p></p>

<p>A megabyte is 1024 kilobytes. A picture on your phone is...</p>

A

<p></p>

<p>about 3 megabytes</p>

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19
Q

<p></p>

<p>A gigabyte is 1024 megabytes. A movie is about...</p>

A

<p></p>

<p>4 gigabytes</p>

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20
Q

<p></p>

<p>Kilobyte = \_\_\_\_</p>

<p>Megabyte = \_\_\_\_</p>

<p>Gigabyte = \_\_\_\_</p>

<p>Terabyte = \_\_\_\_</p>

<p></p>

A

<p></p>

<p>Kilobyte = KB</p>

<p>Megabyte = MB</p>

<p>Gigabyte = GB</p>

<p>Terabyte = TB</p>

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21
Q

<p></p>

<p>What are the 4-bit binary values of the numbers 0 - 5?</p>

<p>0 = _ _ _ _</p>

<p>1 = _ _ _ _</p>

<p>2 = _ _ _ _</p>

<p>3 = _ _ _ _</p>

<p>4 = _ _ _ _</p>

<p>5 = _ _ _ _</p>

A

<p>What are the 4-bit binary values of the numbers 0 - 5?</p>

<p>0 = 0000</p>

<p>1 = 0001</p>

<p>2 = 0010</p>

<p>3 = 0011</p>

<p>4 = 0100</p>

<p>5 = 0101</p>

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22
Q

<p></p>

<p>What are the 4-bit binary values of the numbers 6 - 10?</p>

<p>6 = _ _ _ _</p>

<p>7 = _ _ _ _</p>

<p>8 = _ _ _ _</p>

<p>9 = _ _ _ _</p>

<p>10 = _ _ _ _</p>

A

<p></p>

<p>What are the 4-bit binary values of the numbers 6 - 10?</p>

<p>6 = 0110</p>

<p>7 = 0111</p>

<p>8 = 1000</p>

<p>9 = 1001</p>

<p>10 = 1010</p>

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23
Q

<p></p>

<p>128 64 32 16 8 4 2 1</p>

<p></p>

<p>8 + 16?</p>

A

<p></p>

<p>128 64 32 16 8 4 2 1</p>

<p></p>

<p><strong>24</strong></p>

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24
Q

<p></p>

<p>128 64 32 16 8 4 2 1</p>

<p></p>

<p>16 + 32?</p>

A

<p></p>

<p>128 64 32 16 8 4 2 1</p>

<p></p>

<p><strong>48</strong></p>

<div><div></div></div>

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25
Q

<p></p>

<p>128 64 32 16 8 4 2 1</p>

<p></p>

<p>64 + 32?</p>

<div><div></div></div>

A

<p></p>

<p>128 64 32 16 8 4 2 1</p>

<p></p>

<p><strong>96</strong></p>

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26
Q

<p></p>

<p>128 64 32 16 8 4 2 1</p>

<p></p>

<p>64 + 128?</p>

<div><div></div></div>

A

<p></p>

<p>128 64 32 16 8 4 2 1</p>

<p></p>

<p><strong>192</strong></p>

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27
Q

What is a web browser?

A

A web browser is software that lets you look at web pages.

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28
Q

What are the steps a browser takes to show you a web page?

A

Get the web servers name from the URLConnect to the web serverTransfer a copy of the web page onto your computerDisplay the webpage humans can understand it

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29
Q

What are 6 main web browsers?

A

Google ChromeInternet ExplorerMicrosoft EdgeOperaSafariMozilla Firefox

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30
Q

To show a web page, a browser has to………..

A
  1. Connect to the web server2. Web server transfers a copy of the web page to your computer3. Browser displays a web page in a way humans can understand
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31
Q

What does URL stand for?

A

Uniform Resource Locator

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32
Q

What are the 3 parts of this URL?http://www.cie.org.uk/index.htm

A

http:// - protocolwww.cie.org.uk - domain name (or web server)/index.htm - path (or file)

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33
Q

What is the purpose of an ISP?

A

To provide access to the internet

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34
Q

What does ISP stand for?

A

Internet Service Provider

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35
Q

Name 3 main ISPs in South Korea?

A

KT, SK Broadband, LGU+

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36
Q

What does HTML stand for?

A

Hypertext Markup Language

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37
Q

HTML is a…

A

markup language

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38
Q

Markup languages are used to…

A

add descriptions to text

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39
Q

HTML descriptions are called…

A

tags

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40
Q

HTML tags…

A

tell a browser how to display a document (e.g. webpage)

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41
Q

HTML tags usually come in pairs. Why?

A

One tag turns on the feature, the other turns it off<h1>Dulwich College</h1>

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42
Q

What are the two main types of HTML tags?

A

Structure Presentation

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43
Q

What do HTML structure tags do?

A

Structure tags control the layout of the web pageE.g. page title, headings, sections and paragraphs

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44
Q

What do HTML presentation tags do?

A

Presentation tags change how the web page is displayede.g. bold text, font style, font colour

45
Q

What is hypertext?

A

Hypertext is text that makes a link to a new web page.Hypertext links are shown in blue underlined text

46
Q

<p>Why do programmers use algorithms?</p>

A

<p>Plan and check a program makes sense Choose the right way to solve a problem Describe your solution to people easily Keep a record of your solution</p>

47
Q

<p>What is an example of an algorithm?</p>

A

<p>A recipe</p>

48
Q

<p>What is a sequence, or a sequence of instructions?</p>

A

<p>A series of logical steps carried out in order</p>

49
Q

<p>What is stepwise refinement?</p>

A

<p>Breaking an algorithm down into smaller pieces</p>

50
Q

<p>What does this programming flowchart symbol mean?</p>

<p></p>

<p></p>

<div><div></div></div>

A

<p>Decision</p>

<p></p>

<p>A question is made and has to be answered YES/NO, TRUE/FALSE</p>

51
Q

<p>What does this programming flowchart symbol mean?</p>

A

<p>Start/ End</p>

<p></p>

<p>Shows the beginning and the end of the program</p>

52
Q

<p>What does this programming flowchart symbol mean?</p>

A

<p>Input/Output</p>

<p></p>

<p>Input - the <strong>user </strong>has to input something (e.g. enter data)</p>

<p>Output - the <strong>computer </strong>has to output something (e.g. a display)</p>

53
Q

<p>What does this programming flowchart symbol mean?</p>

A

<p>Process</p>

<p></p>

<p>An instruction that's carried out by the program</p>

54
Q

<p>What does this programming flowchart symbol mean?</p>

A

<p>Shows the direction of the program</p>

55
Q

<p>Name 3 advantages of stepwise refinement</p>

A

<p>Instructions are more detailed</p>

<p>Easier for the user to follow</p>

<p>Less chance of errors</p>

56
Q

<p>What is a conditional statement (or selection)?</p>

A

<p>A program can produce different outputs depending on the results of a logical test.</p>

<p></p>

57
Q

<p>What is a logical test?</p>

A

<p>A test that gives an answer of either TRUE or FALSE</p>

58
Q

<p>What is an algorithm?</p>

A

<p>An algorithm is a set of steps to solve a problem</p>

59
Q

<p>What is pseudocode?</p>

A

<p>A written form of programming describing steps of an algorithm (for humans)</p>

60
Q

What is malicious damage to data?

A

Deliberate unauthorised actions intended to cause damage to data

61
Q

Name 3 examples of malicious damage to data

A

Unauthorised viewingCopying dataCorrupting data

62
Q

Name 3 examples of accidental damage to data

A

Software crashingHardware failureHuman error (deleting/overwriting, dropping/spilling liquids)

63
Q

Explain why data is valuable

A

It can be for personal or business useCould be a personal or private diary or emailCould be company finances or plans

64
Q

What does accidental damage to data mean?

A

Harm was not intendedCould be a software fault or hardware crashCould be something like a power cut or earthquake

65
Q

What are examples of biometric security?

A

finger or thumb printpalm printfacial features (e.g. distance between your eyes)Iris pattern

66
Q

What does biometric mean?

A

A record of physical characteristics used to confirm identity

67
Q

What is a record of physical characteristics used to confirm identity?

A

Biometric security

68
Q

Why is proof of access important to data security?

A

Controls access to dataPrevents identity theft

69
Q

What makes up a strong password?

A

UPPER and lowercase lettersSpecial characters (!#$%#)At least 8 charactersNumbers

70
Q

Why is data valuable?

A

Data can be for personal or business use

71
Q

All data is stored in ________ format

A

All data is stored in binary format

72
Q

What is data that has a precise value that can be represented as a number?

A

digital data

73
Q

Text is also stored as binary numbers.Each character is given a code number.What is the name of the code system?

A

ASCII or UNICODE

74
Q

What tells the computer how to read a file?

A

The file format

75
Q

What are examples of data?

A

videotext/wordsnumbersimagessounds

76
Q

All number values are processed as ______ _______ inside a computer

A

All number values are processed as binary numbers inside a computer

77
Q

One byte of storage can store all the whole numbers from _ to ___

A

One byte of storage can store all the whole numbers from 0 to 255

78
Q

To store numbers larger than 255, computers need more ______

A

To store numbers larger than 255, computers need more bytes

79
Q

Python is a _________ __________

A

Python is a programming language

80
Q

Name 3 facts about python

A

Simple syntax similar to EnglishDesigned to be easy to useIt’s a high-level language

81
Q

What is a syntax in programming?

A

The ‘grammar’ of programming. It means there are rules for how you can write your code. If you don’t follow the rules, your program won’t run properly.

82
Q

An output in Python is an ___-_____ ________

A

An output in Python is an on-screen display

83
Q

To make text appear (or output to the screen) you can use _________

A

print

84
Q

What’s the correct syntax to output:Dulwich College Seoul

A

print (“Dulwich College Seoul”)

85
Q

What’s the correct name of these?( )

A

parentheses( )

86
Q

Something we want the computer to remember is called a __________

A

variable

87
Q

When choosing a variable name you must:

A

Not include spacesUse only letters, numbers and underscore _Using upper and lowercase numbers is different

88
Q

To print a variable name (for example ‘cheese’) you would code

A

print (cheese)

89
Q

What are facts about serial data transmission?

A

single wireone bit at a timeused for long distancereliablecheapslowexample is internet or USB

90
Q

What are facts about parallel data transmission?

A

multiple wiresup to 8 bits at the same timeused for short distancenot as reliable as serialexpensivefastexample is transmission inside a computer

91
Q

What are examples of simplex data transmission?

A

computer to printerCCTVcomputer to monitorcomputer to speaker

92
Q

What are examples of (full) duplex data transmission?

A

telephone callvideo conference (google meet/zoom)whatsapp callonline gaming

93
Q

What are the kinds of signals used to transmit data?

A

wireless signals (radio, microwave, infrared waves)electrical pulses down metal cablespulses of light down fibre-optic cable

94
Q

Describe simplex data transmission

A

one direction only

95
Q

Describe half-duplex data transmission

A

both directions - but not at the same time

96
Q

Describe (full) duplex data transmission

A

both directions - same time

97
Q

What is an example of half-duplex data transmission?

A

Walkie-talkie

98
Q

What’s an example of long distance data transmission

A

internet

99
Q

What’s an example of short distance data transmission?

A

bluetooth (wireless)inside a computer

100
Q

Data is transmitted in one of 3 ways

A

simplexhalf-duplex(full) duplex

101
Q

What kind of data transmission is this?single wire, one bit at a time, cheap, reliable, slow, used for long distance

A

serial

102
Q

What kind of data transmission is this?multiple wires, up to one byte at a time, expensive, fast, not very reliable over long distance, used for short distance

A

parallel

103
Q

What type of data transmission is one way only?

A

simplex

104
Q

What type of data transmission is both directions, but one way at a time?

A

half-duplex

105
Q

What type of data transmission is both directions at the same time?

A

(full) duplex

106
Q

Computer to speaker, computer to monitor and computer to printer are all examples of…

A

simplex data transmissions

107
Q

Walkie talkies are an example of…

A

half-duplex data transmission

108
Q

Online gaming, telephone calls and video calls are examples of…

A

(full) duplex data transmission

CS Y7 (1 decks)

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