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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

 

128   64   32   16   8   4   2   1 

 

64 + 32?

 

 

128   64   32   16   8   4   2   1 

 

96

26

 

128   64   32   16   8   4   2   1 

 

64 + 128?

 

 

128   64   32   16   8   4   2   1 

 

192

27
What is a web browser?
A web browser is software that lets you look at web pages.
28
What are the steps a browser takes to show you a web page?
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
29
What are 6 main web browsers?
Google ChromeInternet ExplorerMicrosoft EdgeOperaSafariMozilla Firefox
30
To show a web page, a browser has to...........
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
31
What does URL stand for?
Uniform Resource Locator
32
What are the 3 parts of this URL?http://www.cie.org.uk/index.htm
http:// - protocolwww.cie.org.uk - domain name (or web server)/index.htm - path (or file)
33
What is the purpose of an ISP?
To provide access to the internet
34
What does ISP stand for?
Internet Service Provider
35
Name 3 main ISPs in South Korea?
KT, SK Broadband, LGU+
36
What does HTML stand for?
Hypertext Markup Language
37
HTML is a...
markup language
38
Markup languages are used to...
add descriptions to text
39
HTML descriptions are called...
tags
40
HTML tags...
tell a browser how to display a document (e.g. webpage)
41
HTML tags usually come in pairs. Why?
One tag turns on the feature, the other turns it off

Dulwich College

42
What are the two main types of HTML tags?
Structure Presentation
43
What do HTML structure tags do?
Structure tags control the layout of the web pageE.g. page title, headings, sections and paragraphs
44
What do HTML presentation tags do?
Presentation tags change how the web page is displayede.g. bold text, font style, font colour
45
What is hypertext?
Hypertext is text that makes a link to a new web page.Hypertext links are shown in blue underlined text
46

Why do programmers use algorithms?

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

47

What is an example of an algorithm?

A recipe

48

What is a sequence, or a sequence of instructions?

A series of logical steps carried out in order

49

What is stepwise refinement?

Breaking an algorithm down into smaller pieces

50

What does this programming flowchart symbol mean?

 

 

 

Decision

 

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

51

What does this programming flowchart symbol mean?

Start/ End

 

Shows the beginning and the end of the program

52

What does this programming flowchart symbol mean?

Input/Output

 

Input - the user has to input something (e.g. enter data)

Output - the computer has to output something (e.g. a display)

53

What does this programming flowchart symbol mean?

Process

 

An instruction that's carried out by the program

54

What does this programming flowchart symbol mean?

Shows the direction of the program

55

Name 3 advantages of stepwise refinement

Instructions are more detailed

Easier for the user to follow

Less chance of errors

56

What is a conditional statement (or selection)?

A program can produce different outputs depending on the results of a logical test.

 

57

What is a logical test?

A test that gives an answer of either TRUE or FALSE

58

What is an algorithm?

An algorithm is a set of steps to solve a problem

59

What is pseudocode?

A written form of programming describing steps of an algorithm (for humans)

60
What is malicious damage to data?
Deliberate unauthorised actions intended to cause damage to data
61
Name 3 examples of malicious damage to data
Unauthorised viewingCopying dataCorrupting data
62
Name 3 examples of accidental damage to data
Software crashingHardware failureHuman error (deleting/overwriting, dropping/spilling liquids)
63
Explain why data is valuable
It can be for personal or business useCould be a personal or private diary or emailCould be company finances or plans
64
What does accidental damage to data mean?
Harm was not intendedCould be a software fault or hardware crashCould be something like a power cut or earthquake
65
What are examples of biometric security?
finger or thumb printpalm printfacial features (e.g. distance between your eyes)Iris pattern
66
What does biometric mean?
A record of physical characteristics used to confirm identity
67
What is a record of physical characteristics used to confirm identity?
Biometric security
68
Why is proof of access important to data security?
Controls access to dataPrevents identity theft
69
What makes up a strong password?
UPPER and lowercase lettersSpecial characters (!#$%#)At least 8 charactersNumbers
70
Why is data valuable?
Data can be for personal or business use
71
All data is stored in ________ format
All data is stored in binary format
72
What is data that has a precise value that can be represented as a number?
digital data
73
Text is also stored as binary numbers.Each character is given a code number.What is the name of the code system?
ASCII or UNICODE
74
What tells the computer how to read a file?
The file format
75
What are examples of data?
videotext/wordsnumbersimagessounds
76
All number values are processed as ______ _______ inside a computer
All number values are processed as binary numbers inside a computer
77
One byte of storage can store all the whole numbers from _ to ___
One byte of storage can store all the whole numbers from 0 to 255
78
To store numbers larger than 255, computers need more ______
To store numbers larger than 255, computers need more bytes
79
Python is a _________ __________
Python is a programming language
80
Name 3 facts about python
Simple syntax similar to EnglishDesigned to be easy to useIt's a high-level language
81
What is a syntax in programming?
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
An output in Python is an ___-_____ ________
An output in Python is an on-screen display
83
To make text appear (or output to the screen) you can use _________
print
84
What's the correct syntax to output:Dulwich College Seoul
print ("Dulwich College Seoul")
85
What's the correct name of these?( )
parentheses( )
86
Something we want the computer to remember is called a __________
variable
87
When choosing a variable name you must:
Not include spacesUse only letters, numbers and underscore _Using upper and lowercase numbers is different
88
To print a variable name (for example 'cheese') you would code
print (cheese)
89
What are facts about serial data transmission?
single wireone bit at a timeused for long distancereliablecheapslowexample is internet or USB
90
What are facts about parallel data transmission?
multiple wiresup to 8 bits at the same timeused for short distancenot as reliable as serialexpensivefastexample is transmission inside a computer
91
What are examples of simplex data transmission?
computer to printerCCTVcomputer to monitorcomputer to speaker
92
What are examples of (full) duplex data transmission?
telephone callvideo conference (google meet/zoom)whatsapp callonline gaming
93
What are the kinds of signals used to transmit data?
wireless signals (radio, microwave, infrared waves)electrical pulses down metal cablespulses of light down fibre-optic cable
94
Describe simplex data transmission
one direction only
95
Describe half-duplex data transmission
both directions - but not at the same time
96
Describe (full) duplex data transmission
both directions - same time
97
What is an example of half-duplex data transmission?
Walkie-talkie
98
What's an example of long distance data transmission
internet
99
What's an example of short distance data transmission?
bluetooth (wireless)inside a computer
100
Data is transmitted in one of 3 ways
simplexhalf-duplex(full) duplex
101
What kind of data transmission is this?single wire, one bit at a time, cheap, reliable, slow, used for long distance
serial
102
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
parallel
103
What type of data transmission is one way only?
simplex
104
What type of data transmission is both directions, but one way at a time?
half-duplex
105
What type of data transmission is both directions at the same time?
(full) duplex
106
Computer to speaker, computer to monitor and computer to printer are all examples of...
simplex data transmissions
107
Walkie talkies are an example of...
half-duplex data transmission
108
Online gaming, telephone calls and video calls are examples of...
(full) duplex data transmission

CS Y7 (1 decks)

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