Questions and Answers
What data processing steps are necessary to develop a mobile application that identifies basketball courts in a suburb?
In a data dictionary, which item type is likely to be stored as a float?
What is the purpose of data normalisation?
What SQL query will return the name and mean temperature of planets with a diameter less than 50,000?
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What is the benefit of using an open data set?
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What is the purpose of data validation?
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What encryption method uses a private and public key to secure data during transmission over the internet?
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Which usability principle is demonstrated by screen-based user interfaces that dynamically adjust for different screen sizes?
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What is the primary cause of a long delay between asking a question and receiving a response during a video call?
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Which encryption method uses a fixed shift of letters down the alphabet with a modulus operation?
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What is the relationship between JSON and REST?
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1 BEGIN 2 INPUT firstNum 3 INPUT secondNum 4 FOR i = 1 TO firstNum 5 FOR j = 1 TO secondNum 6 CALCULATE result = i * j 7 OUTPUT i "*" j "=" result 8 ENDFOR 9 ENDFOR 10 END
How many times would line 6 of the given algorithm be executed if the user inputs firstNum = 6 and secondNum = 10?
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What is the purpose of the FOR loops in the given algorithm?
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What is the output format of the given algorithm?
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Study Notes
Encryption
- RSA uses a private and public key to secure data during transmission over the internet.
- Caesar encryption method uses a fixed shift of letters down the alphabet with a modulus operation.
User Interface
- Screen-based user interfaces must dynamically adjust for different screen sizes because devices have different aspect ratios and dimensions, demonstrating the useability principle.
- Arranging and organising UI elements demonstrates the principle of visual communication.
Networking
- Latency can cause delays in video calls, such as a long delay between asking a question and responding.
- Jitter is not the primary cause of delays in video calls.
Data Exchange
- JSON is a format used to exchange data through REST architecture.
- JSON is not a format used to exchange data with XML.
Algorithm
- The algorithm outputs a data set according to values a user inputs, with a nested FOR loop structure.
- The number of times a line is executed depends on the input values.
Data Analysis
- An open data set contains plain text, requiring data to be retrieved, normalised, and verified for use in a mobile application.
- Normalising, validating, and encrypting data is not necessary for developing a mobile application.
Data Types
- In a data dictionary, numeric item types include quantity and wholesalePrice, which would be stored as a float.
SQL Queries
- A SQL query can return specific data from a database, such as the name and mean temperature of planets with a diameter less than 50,000, ordered in descending order of mean temperature.
- The correct syntax for the SQL query involves using the WHERE and ORDER BY clauses correctly.
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