← Loops and variables lesson New set →

Electronics Worksheet: Loops and Variables

Electronics lesson 25: Loops and variables · Set 131 · 40 questions
TalentJR

Remember (Trace every pass): count = count + k adds k each time round; after n rounds: start + n × k. A loop inside a loop runs outer × inner times. while (condition) repeats until the condition is false — count the rounds as you trace.

NameDateTime takenScore ___ / 40
  1. 1.🔁 total = 0
    for i = 1 to 10 { total = total + i }
    What is total at the end?
  2. 2.🔁 repeat 3 times { repeat 2 times { beep } }
    How many beeps are there?
  3. 3.🔁 total = 0
    for i = 1 to 7 { total = total + i }
    What is total at the end?
  4. 4.🔁 total = 0
    for i = 1 to 3 { total = total + i }
    What is total at the end?
  5. 5.🔁 total = 0
    for i = 1 to 9 { total = total + i }
    What is total at the end?
  6. 6.🔁 What does “count = count + 1” do? (a) takes 1 away (b) adds 1 to count (c) sets count to 1 (d) prints 1
  7. 7.🔁 What does a variable do in a program? (a) measures light (b) blinks an LED (c) joins two wires (d) stores a value
  8. 8.🔁 count = 0
    while (count < 8) { count = count + 4 }
    How many times does the loop run?
  9. 9.🔁 repeat 3 times { repeat 5 times { beep } }
    How many beeps are there?
  10. 10.🔁 total = 0
    for i = 1 to 4 { total = total + i }
    What is total at the end?
  11. 11.🔁 count = 1
    while (count < 21) { count = count + 5 }
    How many times does the loop run?
  12. 12.🔁 count = 0
    while (count < 12) { count = count + 3 }
    How many times does the loop run?
  13. 13.🔁 count = 3
    while (count < 33) { count = count + 5 }
    How many times does the loop run?
  14. 14.🔁 x = 4
    repeat 5 times { x = x × 2 }
    What is x at the end?
  15. 15.🔁 count = 0
    while (count < 10) { count = count + 2 }
    How many times does the loop run?
  16. 16.🔁 count = 4
    while (count < 28) { count = count + 4 }
    How many times does the loop run?
  17. 17.🔁 count = 3
    while (count < 12) { count = count + 3 }
    How many times does the loop run?
  18. 18.🔁 count = 5
    repeat 6 times { count = count + 6 }
    What is count at the end?
  19. 19.🔁 count = 10
    repeat 10 times { count = count + 8 }
    What is count at the end?
  20. 20.🔁 count = 4
    while (count < 18) { count = count + 2 }
    How many times does the loop run?
  21. 21.🔁 count = 4
    repeat 10 times { count = count + 4 }
    What is count at the end?
  22. 22.🔁 count = 4
    repeat 4 times { count = count + 2 }
    What is count at the end?
  23. 23.🔁 repeat 6 times { repeat 2 times { beep } }
    How many beeps are there?
  24. 24.🔁 repeat 4 times { repeat 3 times { beep } }
    How many beeps are there?
  25. 25.🔁 count = 1
    repeat 10 times { count = count + 9 }
    What is count at the end?
  26. 26.🔁 total = 0
    for i = 1 to 12 { total = total + i }
    What is total at the end?
  27. 27.🔁 count = 5
    while (count < 26) { count = count + 3 }
    How many times does the loop run?
  28. 28.🔁 repeat 2 times { repeat 6 times { beep } }
    How many beeps are there?
  29. 29.🔁 x = 2
    repeat 5 times { x = x × 2 }
    What is x at the end?
  30. 30.🔁 count = 6
    repeat 9 times { count = count + 3 }
    What is count at the end?
  31. 31.🔁 total = 0
    for i = 1 to 5 { total = total + i }
    What is total at the end?
  32. 32.🔁 count = 4
    repeat 4 times { count = count + 6 }
    What is count at the end?
  33. 33.🔁 count = 3
    while (count < 7) { count = count + 2 }
    How many times does the loop run?
  34. 34.🔁 x = 2
    repeat 1 time { x = x × 2 }
    What is x at the end?
  35. 35.🔁 repeat 3 times { repeat 4 times { beep } }
    How many beeps are there?
  36. 36.🔁 total = 0
    for i = 1 to 8 { total = total + i }
    What is total at the end?
  37. 37.🔁 total = 0
    for i = 1 to 6 { total = total + i }
    What is total at the end?
  38. 38.🔁 repeat 2 times { repeat 2 times { beep } }
    How many beeps are there?
  39. 39.🔁 count = 7
    repeat 9 times { count = count + 7 }
    What is count at the end?
  40. 40.🔁 count = 2
    while (count < 30) { count = count + 4 }
    How many times does the loop run?

Answer key

  1. 55
  2. 6
  3. 28
  4. 6
  5. 45
  6. adds 1 to count
  7. stores a value
  8. 2
  9. 15
  10. 10
  11. 4
  12. 4
  13. 6
  14. 128
  15. 5
  16. 6
  17. 3
  18. 41
  19. 90
  20. 7
  21. 44
  22. 12
  23. 12
  24. 12
  25. 91
  26. 78
  27. 7
  28. 12
  29. 64
  30. 33
  31. 15
  32. 28
  33. 2
  34. 4
  35. 12
  36. 36
  37. 21
  38. 4
  39. 70
  40. 7

Free electronics lessons, practice and worksheets at talentjr.in/electronics-for-kids