Lesson 4.1.1.2

4.1.1.2 Programming concepts: sequence, selection and iteration Quiz: AQA Computer Science, Unit 1

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.1.1.2, Programming concepts: sequence, selection and iteration: 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. Which of these is NOT one of the three principles used to combine statements in imperative programming?

    • Inheritance
    • Iteration
    • Selection
    • Sequence

  2. What is selection in a program?

    • Executing statements one after another in order
    • Choosing between alternative paths depending on a condition
    • Repeating a block of statements a number of times
    • Declaring a constant with a fixed value

  3. What is definite iteration?

    • Repetition that continues until a condition becomes true, with no fixed count
    • Choosing one of several alternative paths
    • Running statements once in sequence
    • Repetition for a number of times known before the loop starts

  4. What is indefinite iteration?

    • Choosing between two alternative paths by testing a condition with an IF statement
    • Repetition for a fixed count that is set at the start of the loop and never changes
    • Running the same group of statements exactly once from top to bottom in sequence
    • Repetition controlled by a condition, where the number of repeats is not known in advance

  5. What does a condition at the end of a post-test loop mean for the loop body?

    • The body can never run
    • The loop cannot be exited early
    • The condition is checked before the first run
    • The body always runs at least once

  6. What does nested selection mean?

    • A selection with no condition
    • Two separate selections that run one after another
    • One selection statement placed inside another
    • A selection that repeats itself forever

  7. Why is it important to use meaningful identifier names in a program?

    • They make the program run faster when it is compiled
    • They reduce the amount of memory needed for variables
    • They allow the program to skip type checking
    • They make the code easier to read, understand and maintain

  8. Trace the code: x := 0; WHILE x < 3 DO x := x + 1 END WHILE. What is the final value of x?

    • 4
    • 3
    • 0
    • 2

  9. A REPEAT ... UNTIL loop sets count to 5, then the body decrements count by 1, and the loop ends when count = 0. How many times does the body run?

    • 1
    • 4
    • 6
    • 5

  10. A WHILE loop tests the condition at the start, and the condition is false before the first iteration. How many times does the body run?

    • 1
    • 0
    • It runs forever
    • 2

  11. sum := 0; FOR i := 1 TO 4 DO sum := sum + i END FOR. What is the final value of sum?

    • 12
    • 4
    • 10
    • 8

  12. A FOR loop runs i from 1 to 3 and, inside it, a nested FOR loop runs j from 1 to 2. How many times does the innermost body run?

    • 3
    • 9
    • 6
    • 5

  13. A program sets score to 49 and runs: IF score >= 50 THEN output pass ELSE output fail END IF. What is output?

    • 49
    • pass
    • fail
    • neither

  14. A program must display a menu at least once before deciding whether to repeat. Which loop structure is most suitable?

    • A pre-test (WHILE) loop
    • No loop, only selection
    • A FOR loop with a count of zero
    • A post-test (REPEAT ... UNTIL) loop

  15. A FOR loop counts i from 10 down to 1 in steps of 3, so i takes the values 10, 7, 4 and 1. How many iterations are there?

    • 10
    • 5
    • 3
    • 4

  16. A loop must keep reading integers until the user enters the sentinel value -1. Which type of iteration is most suitable?

    • Selection with no loop
    • Recursion with no base case
    • Definite iteration with a count of 10
    • Indefinite iteration controlled by a condition

  17. Why does a pre-test loop differ from a post-test loop when the condition is initially false?

    • A pre-test loop can only be used with a FOR count
    • A post-test loop never runs, while a pre-test loop always runs once
    • A pre-test loop may run zero times while a post-test loop runs at least once
    • Both loops always run the same number of times

  18. A program runs: x := 15; IF x > 10 THEN IF x > 20 THEN output high ELSE output mid END IF ELSE output low END IF. What is output?

    • low
    • high
    • mid
    • nothing

  19. A nested loop processes a grid with 4 rows and 5 columns, visiting every cell once. How many cells are visited in total?

    • 1024
    • 20
    • 25
    • 9

  20. Which of the following loops is definite iteration?

    • IF score > 50 THEN
    • REPEAT ... UNTIL valid
    • FOR i := 1 TO 10
    • WHILE NOT found DO

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