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Understanding the efficiency of algorithms

Quiz by GCSE AQA Computer Science

GCSE (AQA)
Computer Science
English National Curriculum

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12 questions
Show answers
  • Q1
    Which of these can help determine the efficiency of an algorithm?
    That it uses a lot of iteration
    The time it takes to complete
    The amount of comments
    That it uses less selection
    45s
    3.1.3.a
  • Q2
    What impact does the efficiency of an algorithm have on the CPU?
    The CPU can be confused by simple algorithms
    More efficient algorithms requires more processing time
    More efficient algorithms require less processing time
    The CPU can not process inefficient algorithms
    45s
    3.1.3.a
  • Q3
    What does the concept of time efficiency mean?
    That an algorithm requires the least possible time to complete
    That longer algorithms require too much time
    That algorithms should not take a long time to code
    That an algorithm requires more time to complete
    45s
    3.1.3.a
  • Q4
    Which algorithm is the most effective for searching large data sets?
    Linear search
    Merge sort
    Bubble sort
    Binary search
    45s
    3.1.3.a
  • Q5
    Which algorithm in the least effective for searching large sorted data sets?
    Linear search
    Binary Search
    Bubble sort
    Merge sort
    45s
    3.1.3.a
  • Q6
    Why is using subroutines (functions and methods) an efficient way of writing code?
    It allows processes to be repeated with limited code
    It requires less lines of code
    All of these
    It requires less repetitive code
    45s
    3.1.3.a
  • Q7
    What can you do to avoid writing repeated lines of code?
    Use subroutines
    All of these
    None of these
    Using programming languages built in methods
    45s
    3.1.3.a
  • Q8
    What does the acronym DRY stand for?
    Don't Repeat Yourself
    Do Reuse Your code
    Do Repeat Yourself
    Don't Reuse Your code
    45s
    3.1.3.a
  • Q9
    Why should you try and avoid using unnecessary variables?
    To save time
    Because the program uses less memory
    Because it makes the code neater
    So that is offers more abstraction
    45s
    3.1.3.a
  • Q10
    How could this algorithm be made more efficient?
    Question Image
    Using a count controlled loop
    Using selection
    Using a condition controlled loop
    Using a function
    45s
    3.1.3.a
  • Q11
    How could this algorithm be made more efficient if you wanted to work out different shape angles repeatedly?
    Question Image
    using a while loop
    using a for loop
    Using selection
    Using a function
    45s
    3.1.3.a
  • Q12
    Why would this line of code be more efficient: OUTPUT("Your rectangle has a perimeter of", ( side1 + side 2) * 2)
    Question Image
    It uses a subroutine
    It is shorter than the original line
    It isn't, it would return an error
    It doesn't use an additional variable
    45s
    3.1.3.a

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