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Edexcel GCSE Computer Science (1CP2) Exam Questions

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3 questions · 9 marks

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1Multiple choice1 markCharacter Sets Swap Remove

ASCII is a character set used for representing text.

Identify the number of bits used to encode each character in ASCII.

[1 mark]
  • A6
  • B7
  • C8
  • D16
Mark scheme
  • B 7 (1)
  • The only correct answer is B. The correct answer is 7 bits.
  • A is not correct because 6 bits give only 64 different characters
  • C is not correct because 8 bits are used by extended ASCII to give 256 characters
  • D is not correct because 16 bits give 65 536 different characters, which is far more than the 128 in ASCII
Example answers and how they were marked
Full marks1/1

B 7

Why: B is the only correct answer: each ASCII character is encoded using 7 bits (1).

No marks0/1

C 8

Why: Near miss scoring 0: 8 bits is extended ASCII, and the scheme's C line says extended ASCII, not ASCII, is not the answer.

No marks0/1

A 6

Why: Misconception scoring 0: 6 bits give only 64 different characters, so it cannot be ASCII.

2Calculate2 marksBinary Shifts Swap Remove

Computer systems manipulate bit patterns.

Complete the table with the result of applying the shift to the binary pattern.

[2 marks]
Binary patternShift8-bit binary result
0011 0100Logical shift left by 3
Mark scheme

Award one mark for each correct nibble in the correct order:

  • 1010 (1)
  • 0000 (1)

0 marks if the response is not 8-bit binary.

Example answers and how they were marked
Full marks2/2

1010 0000

Why: Every bit moves 3 places left, with 0s in from the right: both nibbles are correct (2).

Some marks1/2

1101 0000

Why: Shifts 2 places instead of 3. The second nibble is correct (1); the first is not.

No marks0/2

0000 0110

Why: Shifts the bits the wrong way. Neither nibble is correct.

3Discuss6 marksUser Management Swap Remove

A small design company has 18 employees who use a network with a shared file server. Some employees are company directors and need to manage the system. Designers need to work on shared project folders, but salary files must be kept private.

Discuss how the operating system's user management can give employees the access they need while protecting the company's files.

Your answer should include:

  • administrator accounts
  • standard user accounts
  • file permissions.
[6 marks]
Mark scheme

Indicative content

Administrator accounts

  • An administrator account can create new user accounts for new employees and delete accounts when employees leave.
  • The administrator can reset a forgotten password, so an employee can get back to work without sharing another person's account.
  • The administrator can set the access rights for each user or group, so designers get access to project folders and only directors can open salary files.
  • Administrator privileges should be given to only a few trusted employees, as administrators can change any settings on the system.

Standard user accounts

  • Designers should use standard user accounts, so they cannot install unauthorised software or change system settings.
  • A standard user can be given permission to read and write files in the project folder that their team uses.
  • Standard users should not be able to change other users' permissions, so the access rules cannot be removed by accident.
  • If a standard user tries to open a file without permission, the operating system denies access.

File permissions

  • Each file or folder can have permissions that allow a user to read, write or delete it.
  • Project folders can be set so all designers can read and write the files inside them.
  • Salary files can be set so only directors can read them, and other users are denied access.
  • Permissions can be set for a group of users, such as all designers, which is quicker than setting them for each person.
  • A file can be made read-only for standard users, so they can view it but cannot change it.

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)

Level 3 responses must cover administrator accounts, standard user accounts and file permissions, and apply them to the design company.

Do not accept general operating system functions such as managing the processor or memory unless they are explicitly linked to controlling what a user can access.

Example answers and how they were marked
Full marks6/6

The directors should have administrator accounts so they can create accounts for new designers, delete accounts when staff leave, and set permissions on the file server. Ordinary designers should have standard user accounts so they cannot install software or change permissions. The administrator can give the designers read and write permission on the shared project folders, but only the directors can read the salary files. This means the designers can work together on projects, while confidential salary information stays private. If a designer leaves, the administrator can disable their account so they can no longer open company files.

Why: Level 3. It covers administrator accounts, standard accounts and file permissions, with coherent application to project folders and salary files.

Some marks4/6

The administrator can add and delete users and set their permissions. Normal users can only access the files they are allowed to. The salary files can be made private so only the administrator can see them.

Why: Level 2. Administrator accounts and file permissions are described with some application, but standard user accounts are not developed and the explanation lacks sustained reasoning.

No marks0/6

The administrator is the person who uses the computer most often, so the operating system gives them more memory and a faster processor. This means they can manage the users.

Why: Level 0. It confuses administrator privileges with extra memory and processor speed, which is process management, not user management.

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