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J277 1 Paper 1 mixed knowledge and application
Part 3 of 5 · J277 Paper 1 · Exam transition
Mixed Paper 1 retrieval across one mobile science lab, with the topic no longer named for you.
Students will:
- decide which specification area a question is testing
- apply hardware and memory knowledge to a described system
- apply network, security and impact knowledge to the same context
- work with less scaffolding as the worksheet progresses
- make and justify an independent technical decision
Inside: 7 explanation cells, 3 multiple-choice questions, 1 fill-in-the-blanks cell and 8 written answers. 38 marks, about 60 minutes.
Series: J277 Paper 1 · Exam transition, part 3 of 5.
Shared by Coding PathwayVerified teacher
- 19 cells
- About 60 minutes
- CC BY-SA 4.0
- Shared 17 Aug 2026
- Updated 9 Sept 2026
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Paper 1 exam transition 3: mixed knowledge and application
Paper 1 moves between topics. This worksheet uses a mobile community science lab to help you retrieve knowledge, choose the relevant idea and apply it without being told the topic name first.
The lab contains laptops, sensors, a local server and a website used to publish observations. Work becomes progressively less scaffolded.
1. The mobile lab system
Inside the vehicle, laptops connect to a switch using Ethernet. A wireless access point connects tablets. A router links the lab's LAN to external networks. The server stores observations, user accounts and a web application.
Read each question carefully. Do not write everything you know about the device: select the function that answers the question.
Which device forwards data between the lab's LAN and external networks?
- ASwitch
- BWireless access point
- CRouter
- DNIC
Explain why Ethernet is suitable for the fixed server but Wi-Fi is suitable for tablets carried around the lab. (4 marks)
Develop one relevant reason for each connection method and link it to the named device.
Students type their answer here.
Twenty students upload large image files at the same time. Explain two ways this could affect network performance. (4 marks)
State the factor, then show its direction and consequence. Do this twice.
Students type their answer here.
2. Inside a laptop
The CPU follows the fetch-execute cycle. The PC stores the address of the next instruction, the MAR stores the address currently being accessed, the MDR stores data or an instruction being transferred, and the ACC stores intermediate arithmetic or logic results.
Performance depends on several factors. A higher clock speed means more cycles per second; more cores can process more instructions at the same time when software can use them; a larger cache can keep more frequently used data and instructions close to the CPU. Avoid claiming that any one factor always doubles performance.
- cache
- accumulator
- memory address register
- control unit
- memory data register
- program counter
The lab compares two laptops. Laptop A has a higher clock speed; Laptop B has more cores and a larger cache. Explain why clock speed alone is not enough to decide which will run the lab software faster. (4 marks)
Explain the effect of at least two different performance factors and avoid an unsupported winner.
Students type their answer here.
3. Memory, storage and systems software
RAM stores programs and data currently in use and is volatile. ROM is non-volatile and can store instructions needed when a system starts or fixed instructions in an embedded system. Secondary storage keeps programs and data when power is removed. Virtual memory uses secondary storage when RAM is insufficient, but is slower than RAM.
The operating system manages resources. Be precise about whether a question concerns memory allocation, multitasking, a peripheral and its driver, users or files.
A laptop has too many applications open and begins using part of its SSD as if it were RAM. What is this called?
- AROM
- BCache
- CCompression
- DVirtual memory
Explain why heavy use of virtual memory can make the laptop slower. (3 marks)
Compare secondary storage with RAM and link this to repeated transfers.
Students type their answer here.
A new USB microscope is connected to a laptop. Explain how the operating system and a device driver help it work. (3 marks)
Distinguish general peripheral management from the driver's translation role.
Students type their answer here.
4. Data, security and impact
The lab publishes images and sound recordings. Increasing resolution, colour depth, sample rate or bit depth can improve representation quality but normally increases uncompressed file size. Compression reduces file size; lossy compression removes data permanently, while lossless compression allows the original data to be reconstructed.
The service also stores student names and observations. Security controls and legal responsibilities must be explained in relation to the actual risk and data.
The lab must preserve every measurement in a scientific data file while reducing its size. Which approach is most suitable?
- ALossless compression
- BLossy compression
- CIncrease the colour depth
- DStore it only in RAM
An attacker intercepts observation files while they are uploaded. Explain how encryption limits the harm. (3 marks)
Say what encryption changes, what is needed to reverse it, and what an interceptor sees.
Students type their answer here.
The lab wants to keep every student's personal data forever in case it is useful. Explain two concerns under the Data Protection Act 2018. (4 marks)
Develop two relevant principles or responsibilities and apply each to indefinite storage.
Students type their answer here.
5. Make an independent decision
The lab can either store all files on its own server or use a cloud service. Researchers travel between locations, some sites have unreliable Internet access, and the files include personal data.
There is no automatic correct choice. A high-quality answer compares consequences and makes its assumptions visible.
Recommend local server storage, cloud storage or a combined approach for the lab. Justify your recommendation. (6 marks)
Consider access, control/security, reliability, cost or maintenance. Apply each developed point to the lab and finish with a supported decision.
Students type their answer here.
Finish: retrieve, select, apply
Mixed questions are not asking you to guess the topic label. They ask you to:
- retrieve the relevant knowledge
- select the part that answers the question
- explain how it works
- apply the consequence to the scenario.
That is the core AO2 habit for Paper 1.