OCR GCSE 2012 Computing Specification J275 Version 1 April 2012
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OCR GCSE 2012 Computing Specification J275 Version 1 April 2012
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Accompanying Instructional DocumentLessons
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Curriculum area
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Max
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Content
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Theory
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2.1.1
Fundamentals of computer systems66
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(a)Define a computer systemOCR Module 1: 2.1
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(b)Describe the importance of computer systems in the modern worldOCR Module 1: 2.2
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(c)Explain the need for reliability in computer systemsOCR Module 1: 2.3
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(d)Explain the need for adherence to suitable professional standards in the development, use and maintenance of computer systemsOCR Module 1: 2.4
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(e)Explain the importance of ethical, environmental and legal considerations when creating computer systems.OCR Module 1: 2.5, 2.6
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2.1.2Computing Hardware
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The CPU46
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(a)State the purpose of the CPUOCR Module 2: 3.1
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(b)Describe the function of the CPU as fetching and executing instructions stored in memoryOCR Module 2: 3.2Crunch
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(c)Explain how common characteristics of CPUs such as clock speed, cache size and number of cores affect their performance
OCR Module 2: 3.3, 3.4, 3.5
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Binary Logic46
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(d)Explain why data is represented in computer systems in binary formOCR Module 2: 3.6
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(e)Understand and produce simple logic diagrams using the operations NOT, AND and OROCR Module 2: 3.7, 3.8
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(f)Produce a truth table from a given logic diagram
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Memory46
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(g)Describe the difference between RAM and ROMOCR Module 2: 3.9
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(h)Explain the need for ROM in a computer systemOCR Module 2: 3.10
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(i)Describe the purpose of RAM in a computer systemOCR Module 2: 3.11
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(j)Explain how the amount of RAM in a personal computer affects the performance of the computerOCR Module 2: 3.12
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(k)Explain the need for virtual memoryOCR Module 2: 3.13
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(l)Describe cache memoryOCR Module 2: 3.14
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(m)Describe flash memoryOCR Module 2: 3.15
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(n)Discuss how changes in memory technologies are leading to innovative computer designsOCR Module 2: 3.15
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Input & Output Devices34
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(o)Understand the need for input and output devicesOCR Module 2: 3.16
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(p)Describe suitable input devices for a wide range of computer controlled situationsOCR Module 2: 3.17
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(q)Describe suitable output devices for a wide range of computer controlled situationsOCR Module 2: 3.17
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(r)Discuss input and output devices for users with specific needsOCR Module 2: 3.18
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Secondary Storage34
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(s)Explain the need for secondary storageOCR Module 2: 3.19
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(t)Describe common storage technologies such as optical, magnetic and solid stateOCR Module 2: 3.19
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(u)Select suitable storage devices and storage media for a given application and justify their choice using characteristics such as capacity, speed, portability, durability and reliabilityOCR Module 2: 3.20
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2.1.3Software
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Software46
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(a)Explain the need for the following functions of an operating system: user interface, memory management, peripheral management, multi-tasking and securityOCR Module 3: 4.1
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(b)Describe the purpose and use of common utility programs for computer security (antivirus, spyware protection and firewalls), disk organisation (formatting, file transfer, and defragmentation), and system maintenance (system information and diagnosis, system cleanup tools, automatic updating)OCR Module 3: 4.2
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(c)Discuss the relative merits of custom written, off the shelf, open source and proprietary softwareOCR Module 3: 4.3
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2.1.4Representation of data in computer systems
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Units23
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(a)Define the terms bit, nibble, byte, kilobyte, megabyte, gigabyte, terabyteOCR Module 4: 5.1
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(b)Understand that data needs to be converted into a binary format to be processed by a computerOCR Module 4: 5.2
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Number46
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(c)Convert positive denary whole numbers (0-255) into 8-bit binary numbers and vice versaOCR Module 4: 5.3
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(d)Add two 8-bit binary integers and explain overflow errors which may occurOCR Module 4: 5.4
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(e)Convert positive denary whole numbers (0-255) into 2-digit hexadecimal numbers and vice versaOCR Module 4: 5.5
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(f)Convert between binary and hexadecimal equivalents of the same numberOCR Module 4: 5.5
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(g)Explain the use of hexadecimal numbers to represent binary numbersOCR Module 4: 5.5
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Character23
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(h)Explain the use of binary codes to represent charactersOCR Module 4: 5.6
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(i)Explain the term character setOCR Module 4: 5.6
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(j)Describe with examples (for example ASCII and Unicode) the relationship between the number of bits per character in a character set and the number of characters which can be representedOCR Module 4: 5.6
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Images12
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(k)Explain the representation of an image as a series of pixels represented in binaryOCR Module 4: 5.7
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(l)Explain the need for metadata to be included in the file such as height, width and colour depthOCR Module 4: 5.8
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(m)Discuss the effect of colour depth and resolution on the size of an image fileOCR Module 4: 5.7, 5.8
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Sound12
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(n)Explain how sound can be sampled and stored in digital formOCR Module 4: 5.9
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(o)Explain how sampling intervals and other considerations affect the size of a sound file and quality of its playbackOCR Module 4: 5.9
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Instructions23
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(p)Explain how instructions are coded as bit patternsOCR Module 4: 5.10
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(q)Explain how the computer distinguishes between instructions and dataOCR Module 4: 5.10
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2.1.5Databases
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The database concept34
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(a)Describe a database as a persistent organised store of dataOCR Module 5: 6.1
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(b)Explain the use of data handling software to create, maintain and interrogate a database.OCR Module 5: 6.1
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The DBMS34
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(c)Describe how a DBMS allows the separation of data from applications and why this is desirableOCR Module 5: 6.2
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(d)Describe the principal features of a DBMS and how they can be used to create customised data handling applicationsOCR Module 5: 6.2
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Relational databases69OCR Module 5: 6.2
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(e)Understand the relationship between entities and tablesOCR Module 5: 6.3
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(f)Understand the components of a relational database, such as tables, forms, queries, reports and modulesOCR Module 5: 6.3
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(g)Understand the use of logical operators in framing database queriesOCR Module 5: 6.4
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(h)Explain the use of key fields to connect tables and avoid data redundancyOCR Module 5: 6.5
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(i)Describe methods of validating data as it is inputOCR Module 5: 6.6
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2.1.6Computer communications and networking
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