data representation computer science past papers

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IGCSE Computer Science By Topic

1.1 data representation, 1.1.1 binary systems, 1.1.2 hexadecimal, 1.1.3 data storage, 1.2 communication and internet technologies, 1.2.1 data transmission, 1.2.2 security aspects, 1.2.3 internet principles of operation, 1.3 hardware and software, 1.3.1 logic gates, 1.3.2 computer architecture and the fetch-execute cycle, 1.3.3 input devices, 1.3.4 output devices, 1.3.5 memory, storage devices and media, 1.3.6 operating systems, 1.3.7 high- and low-level languages and their translators, 1.4 security, 1.4.1 security, 2.1 algorithm design and problem-solving, 2.1.1 problem-solving and design, 2.1.2 pseudocode and flowcharts, 2.2 programming, 2.2.1 programming concepts, 2.2.2 data structures; arrays, 2.3 databases, privacy overview.

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Cambridge igcse computer science (0478).

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A LEVEL COMPUTER SCIENCE 9618 - Topical Past papers - Chapter 13- Data Representation

Subject: Computing

Age range: 16+

Resource type: Unit of work

Last updated

27 February 2024

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13 Data Representation 13.1 User-defined data types 13.2 File organisation and access 13.3 Floating-point numbers, representation and manipulation **Updated Upto 2023 May-June **

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Computer science 0478.

• Computer Science 0478 Past Papers
• Computer Science IGCSE Past Papers and Important Details

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Computer Science 0478 IGCSE Past Papers

Computer science 0478 past papers, computer science  igcse past papers  and important details, 12/01/2023 : computer science 0478 october november 2022 past papers of igcse are updated. moreover computer science 0478 past papers  of  feb march 2022  and  may june 2022  are also available. caie was previously known as cie. within this  past papers   section you will also get  topical past papers  now as well as  solved past papers, topical solved past papers, past papers with answers and solutions.   most of the files are in pdf format and all of them are available for free. examination resource or any other document which is not in pdf like doc, excel, ppt slides, mp4 / video files etc are also available here at papacambridge..

PapaCambridge now offers  CAIE Past Papers App on both  Google Play Store  and  Apple App Store . Once you use it, you will love it. Experience is phenomenal, fast and almost ad less. App not only has  CAIE Computer Science IGCSE Past Papers but it also has all Cambridge level  Past Papers, Notes, Books, Syllabus, Timetable and  Other Resources just like our website but in a lot more convenient way

PapaCambridge provides Cambridge IGCSE Computer Science 0478 latest past papers and resources that includes syllabus, specimens, question papers, marking schemes, resource booklet, FAQ’s , Teacher’s resources and a lot more. Past papers of Cambridge IGCSE Computer Science 0478 are available from 2002 up to the latest session. It’s the guarantee of PapaCambridge that you will find the latest past papers and other resources of Cambridge IGCSE Computer Science (0478) before any other website. All the content offered here is absolutely for free and is provided in the most convenient way so that you don’t face any issue.

Moreover, we have taken convenience to another level now. just login and you will be able to browse content faster and in a convenient way. you can now favourite, share, download entire session papers together and do much more by simply registering. it is absolutely free. , not only do you get yearly unsolved past papers of cambridge igcse computer science but there is a lot more at papacambridge now. click on the links below to find more stuff of caie cambridge igcse computer science. now, you can also get  caie a level teachers  from papacambridge and learn online from the best. , computer science 0478 online tutors, computer science updates, 05 october 2019 : cambridge igcse computer science (0478) past papers and other resources are now available. , 22 april 2020 : all content for cambridge igcse computer science (0478) has been updated., 20 may/june 2020 : all content for cambridge igcse computer science (0478) has been updated., 20 oct/nov 2020 : all content for cambridge igcse computer science (0478) has been updated., 25 august 2020 :   feb / march   2020  and  may / june computer science 0478 past papers are updated., 20 august 2021 :   feb / march   2021  and  may / june   2021  computer science 0478 past papers are updated., 20 january 2022 :   oct / nov   2021 computer science 0478 past papers are updated., the  cambridge igcse computer science syllabus enables learners to apply their computer science knowledge and understanding in order to analyse and present information, give reasoned explanations, and make judgements and recommendations. the syllabus covers topics such as the recording of financial information, computer science principles and control systems, and the preparation of final computer science for a variety of different organisations and businesses. , learners find out about raising capital by shares and loans, ratio analysis and cost computer science, and also study the preparation of cash flow statements, cash flow analysis, and standard costing and investment appraisal, among many other topics., if you don’t want to mess around here between notes, slides, ebooks etc and just want to have past papers of cambridge igcse computer science. check out : cambridge igcse computer science past papers. pastpapers.co only has past papers available to give you clean and smooth experience for browsing past papers.  get caie past papers  here., cambridge igcse computer science 0478 past papers, cambridge  igcse computer science question papers, cambridge  igcse computer science marking schemes, cambridge  igcse computer science syllabus, cambridge  igcse computer science grade thresholds, caie cambridge  igcse computer science, cambridge igcse  computer science resource material, common search terms:, past papers , past papers 2015 jun computer science - 0478 2015 jun igcse 2015 jun computer science - 0478 2015 jun may june 2024, past papers 2015 jun computer science - 0478 2015 jun igcse 2015 jun computer science - 0478 2015 jun march 2024, question papers 2015 jun computer science - 0478 2015 jun igcse 2015 jun computer science - 0478 2015 jun 2024, mark scheme 2015 jun computer science - 0478 2015 jun igcse 2015 jun computer science - 0478 2015 jun 2024, grade thresholds 2015 jun computer science - 0478 2015 jun igcse 2015 jun computer science - 0478 2015 jun 2024, confidential instructions 2015 jun computer science - 0478 2015 jun igcse 2015 jun computer science - 0478 2015 jun 2024, examiner reports latest 2015 jun computer science - 0478 2015 jun igcse 2015 jun computer science - 0478 2015 jun 2024, is there a set answer/method for the computer science pre-release tasks.

The pre-release tasks are open ended to allow more-able students to expand their program or programs. They can also be interpreted in different ways, as there is no one single solution to the tasks. The purpose of the tasks is to allow students to develop their problem solving and programming skills, to create a suitable solution(s) to the tasks. As you will see in the Mark Schemes of previous papers, the answers shown are only one example of a suitable solution. Please be aware that the pre-release tasks are live examination material so we are not in a position to answer specific queries relating to them.

What are the software requirements for IGCSE Computer Science?

For Cambridge IGCSE Computer Science students must have experience of using a high-level programming language, such as Visual Basic, Pascal/Delphi or Python (chosen by the school).

When will the pre-release material for IGCSE Computer Science be available and how do I access it?

From 2023 onward pre-release materials are no longer required for IGCSE Computer Science (0478) and IGCSE 9-1 Computer Science (0984). This is outlined in the ‘Changes to this syllabus for 2023, 2024 and 2025’ section at the back of the 2023 – 2025 syllabus document for each subject.

What high-level procedural language should candidates use?

Centres are free to use any high-level procedural language of their choice, the ones mentioned in the syllabuses are just the most popular choices. The choice is normally down to the experience of the candidate or teacher’s experience in teaching the language to candidates. The pre-release can be undertaken in any high-level procedural programming language, again the choice is down to the centre/candidate. We would recommend that candidates learn a full high-level procedural language such as Python or Visual Basic, so that they have good foundations for their future coding and are able to understand programming code questions within Paper 2.

For this syllabus (last examination in 2022) how many bytes are there in a kilobyte?

Candidates should be taught to use the division/multiplier of 1024 for the IGCSE Computer Science syllabuses. However, in the examination, where candidates do not have access to a calculator, candidates are permitted to use division/multiplication by 1000 in their examination calculations. 

For the new syllabus (first examined in 2023) when candidates are asked to perform calculations or conversions as part of their answer?

Candidates should be taught to use the division/multiplier of 1000 and 1024 at the appropriate time for the IGCSE Computer Science syllabuses. Candidates will be told which suffix to use, for example an answer must be in KB or KiB. If they are told KiB then they will need to use 1024. If they are told KB then they will need to use 1000.

Input and output devices - for the new syllabus first examined in 2023, are candidates still expected to know how each device physically functions as it is with the current syllabus last examined in 2022?

For the current syllabus last examined in 2022, candidates need to know how each device operates. For example, how does an input device scan a barcode and convert it to digital? However, for the new syllabus first examined in 2023, candidates only need to understand what each device does, why it does it, and when it might need to be used, but not how it physically functions.

📑 Update(s):

11/01/2024 :, may / june 2023 and oct / nov 2023 past papers are updated., 24/08/2023 :, caie a levels, o levels and igcse 2023 past papers of march and may /june are updated, 24/03/2023 :, caie a levels have new 2022 updated topical past papers with answers. exclusively available on papacambridge, 12/01/2023 :, october and november 2023 past papers of caie are updated., 2022 and 2023 updates :, 17/10/2022 past papers section is upgraded., may june 2022 and feb march 2022 past papers are updated..

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Teach Computer Science

GCSE Computer Science: Data Representation

Teach gcse students about the different types of data in computer systems and how each is used. suitable for use with aqa, cie, edexcel & ocr..

This module covers the different types of data in computer systems and how each is used. Including:

• Binary system
• Hexadecimal system
• Character sets
• File formats and compression

What’s included?

Each module contains:

• An editable PowerPoint lesson presentation
• Editable revision handouts
• A glossary which covers the key terminologies of the module
• Topic mindmaps for visualising the key concepts
• Printable flashcards to help students engage active recall and confidence-based repetition
• A quiz with accompanying answer key to test knowledge and understanding of the module

As a premium member, you get access to the entire library of GCSE Computer science resources. Choose your theory modules to below to start your downloads.

Binary System

Download module 10: binary system.

This download is exclusively for Teach Computer Science subscribers! To download this file, click the button below to signup (it only takes a minute) and you'll be brought right back to this page to start the download!

Hexadecimal System

Download module 11: hexadecimal system, character sets, download module 12: character sets, download module 13: images, download module 14: sounds, file formats and compression, download module 15: file formats and compression.

| CAIE IGCSE Computer Science 0478/0984(9-1)

1-data representation-igcse computer science past papers by topic for 0478/0984(9-1) for paper 1 / 1.2/1.3- data representation-text/sound and images and data storage and compression topic questions from igcse computer science past papers.

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• 1.2-1.3.1-IGCSE-Computer-Science-Mark-Scheme-Paper-1-Set-1.pdf
• 1.2-1.3.1-IGCSE-Computer-Science-Topic-Questions-Paper-1-Set-1.pdf
• 1.2-1.3.2-IGCSE-Computer-Science-Mark-Scheme-Paper-1-Set-2.pdf
• 1.2-1.3.2-IGCSE-Computer-Science-Topic-Questions-Paper-1-Set-2.pdf
• 1.2-1.3.3-IGCSE-Computer-Science-Mark-Scheme-Paper-1-Set-3.pdf
• 1.2-1.3.3-IGCSE-Computer-Science-Topic-Questions-Paper-1-Set-3.pdf
• 1.2-1.3.4-IGCSE-Computer-Science-Mark-Scheme-Paper-1-Set-4.pdf
• 1.2-1.3.4-IGCSE-Computer-Science-Topic-Questions-Paper-1-Set-4.pdf
• 1.2-1.3.5-IGCSE-Computer-Science-Mark-Scheme-Paper-1-Set-5.pdf
• 1.2-1.3.5-IGCSE-Computer-Science-Topic-Questions-Paper-1-Set-5.pdf
• 1.2-1.3.6-IGCSE-Computer-Science-Mark-Scheme-Paper-1-Set-6.pdf
• 1.2-1.3.6-IGCSE-Computer-Science-Topic-Questions-Paper-1-Set-6.pdf

1.2/1.3- Data Representation-Text/Sound and Images and data Storage and Compression Topic Questions from IGCSE Computer Science Past Papers 

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Computer Science > Machine Learning

Title: high-dimensional sparse data low-rank representation via accelerated asynchronous parallel stochastic gradient descent.

Abstract: Data characterized by high dimensionality and sparsity are commonly used to describe real-world node interactions. Low-rank representation (LR) can map high-dimensional sparse (HDS) data to low-dimensional feature spaces and infer node interactions via modeling data latent associations. Unfortunately, existing optimization algorithms for LR models are computationally inefficient and slowly convergent on large-scale datasets. To address this issue, this paper proposes an Accelerated Asynchronous Parallel Stochastic Gradient Descent A2PSGD for High-Dimensional Sparse Data Low-rank Representation with three fold-ideas: a) establishing a lock-free scheduler to simultaneously respond to scheduling requests from multiple threads; b) introducing a greedy algorithm-based load balancing strategy for balancing the computational load among threads; c) incorporating Nesterov's accelerated gradient into the learning scheme to accelerate model convergence. Empirical studies show that A2PSGD outperforms existing optimization algorithms for HDS data LR in both accuracy and training time.

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Data Storage ( CIE IGCSE Computer Science )

Topic questions.

Julia inputs personal data into her computer.

She stores three copies of the data using a hard disk drive (HDD), a solid state drive (SSD) and a USB flash memory drive.

How did you do?

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Elle uses both CDs and DVDs to store her school projects.

Kamil is setting up a new computer system to record television programmes. He wants to be able to record, view and then erase programmes that he does not want to keep. He has chosen to use DVD-RAM as an optical storage medium.

Explain to Kamil why it is better to use DVD-RAM rather than DVD+RW or DVD-RW.

1 ...................................................................

2 ....................................................................

A computer has a Von Neumann architechure.

Alessandro has some important data stored on his computer. He is concerned about accidental damage to his data.

Alessandro uses an SSD to store his data.

Describe what is meant by an SSD and how it operates to store data

Flash memories and CD-RWs are used as backing media for computers. Give two differences between these two media.

Andrew sends a large document to a printer.