2.1.2 Inputs, outputs, preconditions, caching and reusable components Quiz: OCR Computer Science, Unit 6

The 20 questions

1. Which term describes requirements that must be met before a function or algorithm can safely execute?

   • Postconditions
   • Parameters
   • Preconditions
   • Invariants

2. What is the primary benefit of caching recently accessed data in memory?

   • Increased data security
   • Simpler code structure
   • Faster retrieval speed
   • Reduced memory usage

3. Which software development practice involves using pre-written, tested code modules across multiple projects?

   • Code obfuscation
   • Concurrent processing
   • Procedural abstraction
   • Code reusability

4. What is a potential drawback of web browser caching?

   • Slower page loads
   • Displaying stale data
   • Increased CPU usage
   • Higher bandwidth usage

5. In a subroutine declaration, what are the values passed into the subroutine called?

   • Parameters
   • Return values
   • Preconditions
   • Global variables

6. Which concept describes identifying what data a system needs to receive and produce?

   • Input and output
   • Concurrency
   • Caching
   • Recursion

7. Which algorithm technique saves intermediate results of expensive function calls to avoid recalculation?

   • Paging
   • Backtracking
   • Memoisation
   • Pipelines

8. Why should reusable software components be modular and self-contained?

   • Automatic error correction
   • Easy integration
   • Lower RAM usage
   • Faster CPU execution

9. What type of caching is implemented directly on a processor chip?

   • Web cache
   • DNS cache
   • Disk cache
   • CPU cache

10. What happens if a function is called without fulfilling its specified preconditions?

    • Optimal performance
    • Compilation success
    • Unpredictable errors
    • Automatic parameter repair

11. Which component specification details what data type a subroutine will return?

    • Postcondition
    • Precondition
    • Input specification
    • Output specification

12. How does using external libraries for reusable components affect development time?

    • Increases development time
    • Has no effect
    • Doubles testing time
    • Reduces development time

13. A navigation app caches local map data on a phone. What is the main advantage?

    • Offline availability
    • Increased storage space
    • Better GPS accuracy
    • Real-time traffic updates

14. Which condition ensures that data passed to a square root function is non-negative?

    • Global invariant
    • Precondition
    • Output parameter
    • Postcondition

15. What is the main risk of relying heavily on third-party reusable code libraries?

    • Unused local variables
    • External dependencies
    • Loss of caching
    • Slower compilation

16. In computational thinking, what does 'thinking ahead' primarily involve?

    • Designing user interfaces
    • Debugging syntax errors
    • Writing code immediately
    • Planning inputs/outputs

17. Which cache strategy determines which item to remove when the cache memory is full?

    • Replacement policy
    • Parameter passing
    • Modular breakdown
    • Precondition check

18. A function calculates compound interest. What are the principal, rate, and time?

    • Preconditions
    • Outputs
    • Inputs
    • Cached values

19. What is the primary purpose of a function header in a reusable code library?

    • Data caching
    • Hardware abstraction
    • Interface definition
    • Memory allocation

20. Which factor makes a subroutine easiest to reuse in another project?

    • Hardcoded input values
    • Complex nested loops
    • No global variables
    • Using global variables

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