IB Computer Science SL Flashcards: May 2015 Paper 1 Review

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Questions and Answers

What is the total maximum mark for the Computer science SL paper 1 exam?

70 marks

How are alternative answers or wordings indicated in the markscheme?

Alternative answers or wordings are indicated in the markscheme by a "/"; either wording can be accepted.

What is the purpose of words in parentheses `(...)` in the markscheme?

Words in parentheses (...) in the markscheme are not necessary to gain the mark.

When deciding upon alternative answers by candidates, what is the key principle to apply?

If the candidate's answer has the same meaning or can be clearly interpreted as being the same as that in the markscheme, then award the mark. Signup and view all the answers

What is the marking approach recommended in the text?

Mark positively. Signup and view all the answers

How are separate points worth one mark indicated in the markscheme?

Each statement worth one point has a separate line and the end is signified by means of a semi-colon (;). Signup and view all the answers

What is a suitable measure related to the insurance company?

Mirror system Signup and view all the answers

Explain the purpose of the OSI model.

To standardize network communication Signup and view all the answers

What are protocols used for in networking?

To facilitate correct process execution Signup and view all the answers

Provide an advantage of using the OSI model with an elaboration.

Standardization of network communication Signup and view all the answers

What is a disadvantage of using protocols in networking with an elaboration?

Potential overhead in data transmission Signup and view all the answers

List one purpose of any layer in the OSI model.

Physical layer defines the physical connection Signup and view all the answers

What is the purpose of the `COUNT` operation in the first example?

The <code>COUNT</code> operation counts the number of elements in the sequence, which is used to check if the sequence is perfect. Signup and view all the answers

What is the purpose of the `SUM` operation in the second example?

The <code>SUM</code> operation calculates the cumulative sum of the elements in the sequence. Signup and view all the answers

What is the significance of the `mod` operation in the examples?

The <code>mod</code> operation is used to check if the count of the sequence is a factor of the current element, which indicates that the sequence is perfect. Signup and view all the answers

Explain the purpose of the usability features mentioned in the text.

The usability features are designed to make the software more accessible and easier to use for users with various physical and technical capabilities, such as larger screens, adjustable brightness and volume, and accessibility options for visually impaired users. Signup and view all the answers

How are the usability features evaluated in the text?

The usability features are evaluated based on whether they provide [1 mark] for each feature and [1 mark] for an elaboration clearly related to the needs of the user, up to a maximum of [4 marks]. Signup and view all the answers

What are the two ways in which the communication and installation of software updates are evaluated in the text?

The communication of updates is evaluated by awarding [1 mark] for email/pop-up communication, and the method of installation is evaluated by awarding [1 mark] for automatic/link/list-based installation. Signup and view all the answers

What is one advantage of using mobile devices for lawyers in a law firm?

Lawyers can access information quickly from anywhere in the building, without needing to be at their workstation. Signup and view all the answers

What is one potential security concern with using a wireless network in a law firm?

The wireless signal could be accessible from nearby areas outside the building if not properly secured. Signup and view all the answers

How many marks are awarded for correctly looping through a collection in the given algorithm?

1 mark Signup and view all the answers

What is the first condition checked in the algorithm for returning a job?

If the job's time is greater than 10 minutes. Signup and view all the answers

In what order does the algorithm search for jobs based on priority levels?

The algorithm searches from priority level 1 to 4 in order. Signup and view all the answers

What is a similarity between using mobile devices and a cabled system for lawyers in a law firm?

Both systems allow lawyers to access information and work on tasks. Signup and view all the answers

How should markers approach grading candidates' responses?

Markers should give credit for what candidates have achieved and gotten correct, rather than penalizing them for mistakes or omissions. They should be forgiving of minor linguistic errors, especially for candidates writing in a second language. Signup and view all the answers

How should markers handle calculation errors that impact subsequent parts of a question?

If a calculation error is made in one part but the incorrect result is used correctly in subsequent parts, the marker should award follow-through (FT) marks for those later parts. Signup and view all the answers

For 'identify' questions asking for multiple responses, how should excessive answers be handled?

Markers should read all answers provided and mark positively up to the maximum marks prescribed. Any incorrect answers beyond that should be disregarded. Signup and view all the answers

For 'describe' questions asking for a certain number of facts, how should the marking be approached?

Markers should mark the first specified number of correct answers, which could include descriptions, identifications, or a mix of both. Signup and view all the answers

How should 'explain' questions asking for multiple explanations be marked?

For 'explain' questions specifying a number of required explanations, markers should mark the first specified number of correct answers, which could include full explanations, partial explanations, or a combination. Signup and view all the answers

What is considered more important in this subject: grammatical accuracy or effective communication?

The text states that in this subject, effective communication is more important than grammatical accuracy. Signup and view all the answers

Study Notes

Marking Guidance

Give candidates credit for what they have achieved and what they have got correct, rather than penalizing them for what they have not achieved or what they have got wrong.
Be forgiving of minor linguistic slips in candidates' writing, as effective communication is more important than grammatical accuracy.
If an error is made in the first part of a question, penalize it, but if the incorrect answer is used correctly in subsequent parts, award follow-through marks and indicate this with "FT".

Question Types

For "identify" questions, read all answers and mark positively up to the maximum marks, disregarding incorrect answers.
For "describe" questions, mark the first two correct answers, which can include two descriptions, one description and one identification, or two identifications.
For "explain" questions, mark the first two correct answers, which can include two full explanations, one explanation, one partial explanation, etc.

Section A

Award [1 mark] for each usability feature and [1 mark] for an elaboration clearly related to the needs of the user, up to [4 marks max].
Features can include larger screen, hotkeys, quick access to frequently used adjustments, size and sensitivity of touchpad, and standard accessibility for visually impaired.
Award up to [2 marks max] for communication with user and method of installation of update.

Algorithm

Award marks as follows up to [5 marks max]:
- [1 mark] for looping through the collection
- [1 mark] for returning a job first if time>10 min
- [1 mark] for searching the loop again for each priority level
- [1 mark] for searching from 1 – 4 in order
- [1 mark] for ending when the highest priority level job is found

Similarities and Differences

Award [2 marks max] for the similarities and [2 marks max] for the differences.

Markscheme

The markscheme is the property of the International Baccalaureate and must not be reproduced or distributed to any other person without the authorization of the IB Assessment Centre.
General guidance: do not award more than the maximum marks allowed for that part of a question.
When deciding upon alternative answers by candidates, consider the following points:
- Each statement worth one point has a separate line and the end is signified by means of a semi-colon (;).
- An alternative answer or wording is indicated in the markscheme by a “/”; either wording can be accepted.
- Words in ( … ) in the markscheme are not necessary to gain the mark.
- If the candidate’s answer has the same meaning or can be clearly interpreted as being the same as that in the markscheme then award the mark.

Computer Science

Award [1 mark] for a suitable measure and [2 marks] for a description related to the insurance company.
Examples of answers include mirror system, all changes to the records made on two systems, off-site backup, and snapshots/backups made on a regular basis.

OSI Model

Award up to [3 marks max]:
- The OSI is a standardized system/model for network connection
- Consists of (7) layers
- Each dealing with specific parts of network communication
- For example, the physical layer defines the physical connection
Award [1 mark] for the purpose of any of the 7 layers.
If the candidate lists all 7 layers with no specific example, award [2 marks] and a further [1 mark] if the purpose of at least one layer is given.

Protocols

Award up to [3 marks max]:
- Protocols are a set of rules
- To facilitate a process being carried out correctly
- (Used in each layer to ensure communication)
- For example, in the physical layer, protocols define the methods for opening and closing communication
Do not accept examples that are not related to networks.

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Description

Explore the official markscheme for the International Baccalaureate Computer Science Standard Level Paper 1 from May 2015. This document contains detailed mark allocations for Section A, covering a total of 25 marks.

IB Computer Science SL Paper 1 Markscheme May 2015