A-Level OCR Computer Science ~ Unit 10 ~ Computational Thinking EXAM QUESTIONS AND ANSWERS 100% CORRECT!

What is a good example of abstraction? - ANSWER London Underground Map Problem Abstraction - ANSWER Removing details until the problem reduces to one which has already been solved Abstract Model - ANSWER Input --> Computational Problem --> Output Input - information relevant to the problem Output - solution to the problem Thinking Ahead - ANSWER Add detail to the initial abstract model until it has been transformed into a computer program Specifying Preconditions - ANSWER Program components are reusable, easier to debug and maintain and unnecessary checks are cut out Caching - ANSWER Temporary storage of data and instructions, and can be quickly retrieved Advantages of Caching - ANSWER Faster access to cached resources, saves cost on bandwidth use and reduces load on web services Disadvantages of Caching - ANSWER Slow performance if resource isn't found in the cache Thinking Procedurally - ANSWER Components of the problem and solution need to be identified, sub-procedures (modules) and the order of steps also need to be identified P