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Edexcel GCSE Computer Science (1CP2) Exam Questions

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3 questions · 10 marks

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1Describe2 marksStored Program Computers Swap Remove

The control unit (CU) is a component inside the CPU.

Describe the role of the control unit in the fetch-decode-execute cycle.

[2 marks]
Mark scheme

Award up to two marks for a linked description such as:

  • Decodes each (fetched) instruction (1) to work out which operation is needed / which components should carry it out (1)
  • Coordinates/directs the other components (1) by sending control signals along the control bus (1)
  • Fetches the next instruction (1) by sending its address to main memory along the address bus (1)
  • Sends a read/write control signal to main memory (1) so that the instruction or data is transferred during the fetch/execute stage (1)

Do not accept answers about synchronising the CPU or timing the cycles (that is the role of the clock).

Do not accept answers about carrying out arithmetic or logical operations (that is the ALU).

Do not accept answers about holding data or the results of instructions (that is registers/main memory).

Do not accept generic answers that only say the CU controls the CPU or processes instructions, with no linked development.

Only award one mark for a response that only repeats that the CU sends control signals; the second mark needs a linked outcome such as coordination, a memory read/write, or fetching an instruction.

Do not accept 'during the decode stage' as the development for the decoding point, as it restates the question.

Example answers and how they were marked
Full marks2/2

It decodes the instruction that has been fetched so that it knows which operation the CPU must carry out and which components should do it.

Why: Decoding named with the acceptable wording 'each (fetched) instruction' (1), plus the linked development that this identifies the operation and components (1).

Some marks1/2

It decodes each instruction during the decode stage of the cycle.

Why: Earns (1) for decoding the instruction. 'During the decode stage' restates the question and is not accepted as a development, so the second mark is not earned.

No marks0/2

It carries out the calculations and comparisons when the instruction is executed.

Why: Calculations and comparisons are the ALU's role, which the 'Do not accept' line rules out, so no mark is earned.

2Explain2 marksEmbedded Systems Swap Remove

A greenhouse uses an embedded system to keep the plants healthy.

Explain how the embedded system controls the temperature in the greenhouse.

[2 marks]
Mark scheme

Award up to two marks for a linked explanation such as:

  • A temperature sensor measures/reads the temperature in the greenhouse (1) which the processor compares with the value stored in the system (1)
  • The heater is switched on (1) when the temperature reading goes below the value stored in the system (1)
  • A fan/vent/window is opened/a cooler is switched on (1) when the temperature reading goes above the value stored in the system (1)
  • The temperature is checked/measured continuously (1) so the heater/fan is switched on or off as soon as the temperature changes (1)

For both marks, the expansion must follow/associate with the statement.

Allow one mark for a correct point on its own without a linked reason, e.g. 'a temperature sensor measures the temperature'.

Do not award 'the embedded system controls/keeps the temperature correct' as this repeats the question.

Do not accept naming a device without saying what it does, e.g. 'the greenhouse has a thermostat'.

Example answers and how they were marked
Full marks2/2

A temperature sensor measures the temperature in the greenhouse, which the processor compares with the value stored in the system.

Why: Point (1): the input and what it measures. Reason (1): the linked statement about what the processor does with the reading.

Some marks1/2

The embedded system uses a temperature sensor that measures the temperature in the greenhouse.

Why: A correct point on its own (1); no linked statement about what the system does with the reading, so the second mark is not awarded.

No marks0/2

The embedded system controls the temperature so the plants do not get too cold.

Why: Rewords the question without saying how the temperature is measured or changed, so no mark is awarded.

3Discuss6 marksSecondary Memory Swap Remove

An independent film studio sells its films on discs. It also offers the same films as downloads. The studio is deciding whether to keep selling films on optical discs.

Discuss the use of optical storage for selling films.

Your answer should include:

  • how data is stored on optical media
  • the benefits of optical discs for selling films
  • the drawbacks of optical discs for selling films.

You do not need to consider other types of secondary storage.

[6 marks]
Mark scheme

Indicative content

How data is stored on optical media

  • Data is stored as pits and lands burnt or pressed into a spiral track on the disc.
  • A laser beam is shone at the disc and the light that is reflected back is measured; pits and lands reflect the light differently.
  • The differences in the reflected light are read as binary 1s and 0s.

Benefits of optical discs for selling films

  • Optical discs are cheap to mass produce once the master disc has been pressed, so the studio can sell each film at a low price.
  • A disc is small and light, so a customer can easily store it, carry it home or give it as a gift.
  • A Blu-ray disc can hold a whole high-definition film (up to 50 GB), so a customer can watch the film without an internet connection.
  • Artwork can be printed on the disc and its case, which helps the studio sell the film.

Drawbacks of optical discs for selling films

  • A DVD holds only about 8.4 GB, so a high-definition film with extra features may not fit on one and the studio would need to sell it on a Blu-ray instead.
  • Optical discs are easily scratched, which can cause read errors so the film will not play.
  • Many modern devices, such as some laptops, no longer have a disc drive, so some customers would not be able to play the film.
  • Discs can be affected by heat and sunlight, so they may deteriorate over time.

Levels

  • Level 0 (0 marks): No rewardable content.
  • Level 1 (1–2 marks): Basic, independent points are made, showing elements of understanding of key concepts/principles of computer science. (AO1) The discussion will contain basic information with little linkage between points made or application to the context. (AO2)
  • Level 2 (3–4 marks): Demonstrates adequate understanding of key concepts/principles of computer science. (AO1) The discussion shows some linkages and lines of reasoning with some structure and application to the context. (AO2)
  • Level 3 (5–6 marks): Demonstrates comprehensive understanding of key concepts/principles of computer science to support the discussion being presented. (AO1) The discussion is well developed, with sustained lines of reasoning that are coherent and logically structured, and which clearly apply to the context. (AO2)

Additional guidance

  • Level 2 requires points to be linked or developed, for example a benefit or drawback explained in terms of the studio or its customers. An answer that only lists basic, independent points, with no linkage, is limited to Level 1.
  • Level 3 requires all three areas and a judgement about whether the studio should keep selling films on optical discs. Do not credit magnetic storage or solid state storage as a description of how optical media stores data; credit these only where they are compared with optical media.
Example answers and how they were marked
Full marks6/6

Optical media stores data as pits and lands burnt into a spiral track. A laser beam is shone at the disc and the reflected light is measured; pits and lands reflect it differently, and this pattern is read as binary 1s and 0s. Optical discs are cheap to mass produce, so the studio can sell each film at a low price, and a disc is small and light so a customer can store it or give it as a gift. A Blu-ray holds a whole high-definition film and can be played without an internet connection. However, a DVD may not hold a high-definition film with extra features, so the studio would need a Blu-ray, and discs are easily scratched, which can cause read errors so the film will not play. Many modern laptops have no disc drive, so some customers could not play the film. Overall the studio should keep selling discs as well as downloads, because the discs are cheap to produce and give customers a copy that works without an internet connection, even though some customers will prefer to download.

Why: Explains how data is stored on optical media using pits, lands, reflected light and binary (AO1); gives benefits applied to selling films (cheap mass production, portability, Blu-ray holds a film and plays offline) and drawbacks (DVD capacity, scratches causing read errors, no disc drive in modern laptops); ends with a sustained judgement and recommendation, so it meets the Level 3 guidance.

Some marks2/6

Optical storage uses a laser to read pits and lands. It is cheap to make discs, so the studio can sell them cheaply. Discs are portable. But they can be scratched and damaged. Some computers don't have a disc drive.

Why: Basic point about how data is stored, a laser reading pits and lands (1), plus basic points about benefits (cheap to produce, portable) and drawbacks (scratched, no disc drive), but the points are independent and undeveloped with no linkage or application to the studio, so it is the top of Level 1: 2 marks.

No marks0/6

Optical storage uses magnets to store data. The film studio should use optical discs because they are very fast and have a large capacity. They are not affected by scratches.

Why: No creditworthy points. Confuses optical storage with magnetic storage; claims it is fast, has a large capacity and is not affected by scratches, all of which are incorrect. Level 0.

Questions by topic

2.1 Binary

Build a paper on this topic 58
Adding Binary Numbers 6 questions Binary and Hexadecimal Basics 10 questions Binary Shifts 6 questions Binary to Denary Conversion 6 questions Binary to Hexadecimal Conversion 6 questions Denary to Binary Conversion 6 questions Denary to Hexadecimal Conversion 6 questions Denary to Negative Binary Conversion 6 questions Hexadecimal to Binary Conversion 6 questions

2.2 Data representation

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Character Sets 18 questions Images 19 questions Sound 19 questions

2.3 Data storage and compression

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Compression 18 questions Units & Conversion 6 questions

3.1 Hardware

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Embedded Systems 17 questions Fetch Decode Execute Cycle 15 questions Primary Memory 15 questions Secondary Memory 15 questions Stored Program Computers 15 questions

3.2 Software

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File Management 18 questions Memory Management 16 questions Peripheral Management 11 questions Process Management 12 questions Purpose & Function of Operating Systems 17 questions Software Basics 13 questions User Management 18 questions Utility Software 19 questions

3.3 Programming languages

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Low and High Level Languages 19 questions Translators 18 questions

4.1 Networks

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Addressing 16 questions LANs & WANs 16 questions Network Speed 5 questions Packet Switching 16 questions Protocols & Layers 17 questions The Internet 16 questions Topologies 17 questions Wired Connections 17 questions Wireless Connections 18 questions

4.2 Network security

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Network Security Risks 18 questions Preventing Network Security Risks 18 questions

5.1 Environmental

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E-waste 17 questions Manufacturing Technology 19 questions

5.2 Ethical and legal

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Data Protection Act 17 questions Impact of AI 18 questions Intellectual Property 18 questions Software Licences 18 questions

5.3 Cybersecurity

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Malware 18 questions Social Engineering 18 questions

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