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Edexcel GCSE Computer Science (1CP2) Exam Questions

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2 questions · 4 marks

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1Describe2 marksPrimary Memory Swap Remove

Computers use RAM to hold data and instructions while programs run. RAM is volatile.

Describe what this means for the data and instructions that are held in RAM.

[2 marks]
Mark scheme

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

  • The data and instructions held in RAM are lost/cleared/erased when the power is switched off / is cut (1) so RAM can only hold the data and instructions for programs that are currently running (1)
  • If the power is switched off, the data and instructions held in RAM cannot be read/used by the CPU (1) so a program cannot carry on from where it stopped (1)
  • RAM can only hold the data and instructions for a program while the computer is switched on (1) because it loses its contents / cannot keep them without a continuous power supply (1)

Accept 'RAM needs a continuous power supply' / 'RAM needs power to keep its data and instructions' as an alternative way of saying that the data and instructions in RAM are lost when the power is switched off (1). Do not award a second mark for a response that only repeats that the contents are lost when the power is switched off (e.g. 'the data is gone when the power is off').

Do not accept responses that say the data and instructions in RAM are permanent / are stored when the power is off.

Do not award a mark for responses that say RAM is temporary / temporarily holds data with no reference to the power being switched off.

Do not award a mark for responses that state data is deleted/lost without any reference to the power being switched off.

Do not award a mark for responses about RAM being fast, small/large in capacity or read-only, as these do not describe volatility.

Example answers and how they were marked
Full marks2/2

The data and instructions held in RAM are lost when the power is switched off so RAM can only hold the data and instructions for programs that are currently running.

Why: Linked point (1): the contents are lost when the power is switched off, plus a distinct linked development (1): RAM only holds the data and instructions for programs that are currently running.

Some marks1/2

If the power is cut then the data and instructions in RAM are gone.

Why: Correct point (1): the data and instructions are lost when the power is cut; no distinct development is given, so only one mark.

No marks0/2

RAM is volatile, which means the data in it is stored permanently and cannot be changed.

Why: Reverses the meaning of volatile and says the contents are permanent; this is the misconception covered by the 'Do not accept' line, so no mark.

2Explain2 marksTopologies Swap Remove

A small office uses a star topology with a central switch.

Explain one benefit of using a star topology in the office.

[2 marks]
Mark scheme

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

  • If one cable/device fails, the other devices on the network are not affected (1) because each device has its own separate connection to the central switch (1)
  • Faults are easier to find (1) because each device has its own cable, so the faulty cable can be checked on its own (1)
  • Data is sent only to the intended device (1) because the central switch forwards the data only to the device it is addressed to (1)
  • Data transfer is fast (1) because each device has its own cable, so devices do not share the cable with each other (1)
  • New devices can be added easily (1) because a device only needs one cable to a spare port on the central switch (1)

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

A benefit stated on its own can earn one mark; the second mark is only for a linked reason.

Accept 'switch' for the central device.

Do not accept 'server' or 'hub' for the central device.

Do not accept 'hub', as a hub sends data to all devices, not only to the intended device.

Do not award a mark for responses that say only that the network is better/more reliable/easier without naming a benefit.

Example answers and how they were marked
Full marks2/2

If one of the cables breaks, the other devices can still communicate because each device has its own separate cable connected to the central switch.

Why: Linked benefit (1) and reason (1): a single cable failure does not affect the other devices because each device has a separate connection to the switch.

Some marks1/2

If one cable breaks, the other devices are not affected.

Why: A benefit is stated on its own (1), but there is no linked reason about each device having its own connection to the central switch, so the second mark is not awarded.

No marks0/2

It is better than a bus topology because every device connects to the central server.

Why: No credit: 'better' does not name a benefit, so no first mark, and 'server' is not accepted as the central device, so there is no linked reason either.

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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