Lesson 4.1.1.6

4.1.1.6 Constants and variables Quiz: AQA Computer Science, Unit 1

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.1.1.6, Constants and variables: 20 multiple choice questions for the AQA Computer Science (7517), Unit 1: Fundamentals of programming, written with Revision Ninja.

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The 20 questions

  1. What is the key feature of a constant compared to a variable?

    • Fixed value
    • Local scope
    • Dynamic value
    • Global scope

  2. What is the primary maintenance benefit of using a named constant?

    • Single update point
    • Lower memory usage
    • Faster execution speed
    • Automatic type inference

  3. What term describes a named value that cannot be changed during runtime?

    • Array
    • Constant
    • Variable
    • Pointer

  4. Which operation stores a computed value inside a variable?

    • Initialisation
    • Assignment
    • Iteration
    • Declaration

  5. Which name follows common convention for a named constant that holds the number of days in a week?

    • daysInWeekCount
    • 7 days in a week
    • DaysInWeekTotalValue
    • DAYS_IN_WEEK

  6. Given a constant TAX_RATE and variable price, which value can be reassigned at runtime?

    • Both identifiers
    • Neither identifier
    • price
    • TAX_RATE

  7. What is the term for assigning a starting value to a variable?

    • Declaration
    • Assignment
    • Instantiation
    • Initialisation

  8. CONST MAX = 10 is declared, and the code later uses MAX * 2. What is the value?

    • 20
    • 10
    • 5
    • 12

  9. x := 5, then x := x + 3. What is the final value of x?

    • 8
    • 15
    • 3
    • 5

  10. A constant GST_RATE = 0.2 is applied to a price of 50 to find the tax. What is the tax?

    • 15
    • 250
    • 5
    • 10

  11. What type of error is raised when attempting to alter a constant value?

    • Overflow error
    • Compilation error
    • Logic error
    • Runtime error

  12. To swap the values of variables a and b, which sequence of statements works correctly?

    • a := b; b := a; temp := a
    • temp := a; a := b; b := temp
    • temp := b; a := a; b := temp
    • a := a + b; b := a; temp := b

  13. A variable count is set to 0 and incremented once inside a loop that runs 4 times. What is count at the end?

    • 3
    • 5
    • 0
    • 4

  14. Which identifier is most meaningful for storing the number of students enrolled on a course?

    • numberOfStudents
    • x
    • students123
    • num

  15. What is a key advantage of using a named constant instead of a hardcoded value?

    • Reduced memory usage
    • Faster execution speed
    • Automatic type conversion
    • Single location update

  16. A total variable is initialised to 0. Then 5 is added three times and 2 is subtracted once. What is the final total?

    • 3
    • 10
    • 15
    • 13

  17. A constant RATE = 0.05 is applied as compound interest to a balance of 100 for 2 years. What is the balance at the end, to 2 decimal places?

    • 110.00
    • 105.00
    • 110.25
    • 115.50

  18. Which programming construct prevents hardcoding the same literal value in multiple places?

    • Named constant
    • Local variable
    • Global variable
    • Subroutine parameter

  19. What happens if a running total variable is not initialised to zero before a calculation?

    • Syntax error
    • Type mismatch error
    • Infinite loop
    • Incorrect cumulative total

  20. Why use a named constant like PI instead of repeating the literal value 3.14159?

    • Increases execution speed
    • Improves code readability
    • Saves RAM allocation
    • Prevents compilation errors

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