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Electronics Worksheet: If Else with Sensors

Electronics lesson 24: If / else with sensors · Set 219 · 40 questions
TalentJR

Remember (Test, then choose): Put the reading into the condition: true → the if part, false → the else part. > means strictly more and < strictly less; an equal reading makes them false. AND: both true. OR: at least one true. In a chain, the first true condition wins.

NameDateTime takenScore ___ / 40
  1. 1.🤖 if (sound > 80) { red LED ON } else { green LED ON }
    The sound sensor reads 71. What happens?     (a) green LED ON (b) red LED ON
  2. 2.🤖 if (temperature > 32) { show “Hot” } else if (temperature > 21) { show “Warm” } else { show “Cool” }
    The temperature is 24 °C. What is shown?     (a) Cool (b) Warm (c) Hot
  3. 3.🤖 if (sound > 60) { red LED ON } else { green LED ON }
    The sound sensor reads 78. What happens?     (a) green LED ON (b) red LED ON
  4. 4.🤖 if (temperature > 34) { show “Hot” } else if (temperature > 23) { show “Warm” } else { show “Cool” }
    The temperature is 43 °C. What is shown?     (a) Cool (b) Hot (c) Warm
  5. 5.🤖 “if (A AND B)” is true when … (a) only A is true (b) only B is true (c) both are false (d) both A and B are true
  6. 6.🤖 if (distance < 30) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 23 cm. What happens?     (a) buzzer beeps (b) buzzer is silent
  7. 7.🤖 if (moisture < 30) { pump ON } else { pump OFF }
    The soil moisture sensor reads 43 %. What happens?     (a) pump OFF (b) pump ON
  8. 8.🤖 if (temperature > 37) { show “Hot” } else if (temperature > 22) { show “Warm” } else { show “Cool” }
    The temperature is 15 °C. What is shown?     (a) Warm (b) Cool (c) Hot
  9. 9.🤖 if (temperature > 30) { show “Hot” } else if (temperature > 24) { show “Warm” } else { show “Cool” }
    The temperature is 39 °C. What is shown?     (a) Hot (b) Cool (c) Warm
  10. 10.🤖 if (light < 200 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 380 and motion is detected (true). What happens?     (a) porch lamp ON (b) porch lamp OFF
  11. 11.🤖 if (moisture < 50) { pump ON } else { pump OFF }
    The soil moisture sensor reads 32 %. What happens?     (a) pump ON (b) pump OFF
  12. 12.🤖 In “if (temp > 30)”, what runs when temp is exactly 30? (a) neither part (b) the if part (c) the else part (d) both parts
  13. 13.🤖 if (light < 300 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 480 and motion is not detected (false). What happens?     (a) porch lamp ON (b) porch lamp OFF
  14. 14.🤖 if (light < 200 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 390 and motion is not detected (false). What happens?     (a) porch lamp OFF (b) porch lamp ON
  15. 15.🤖 if (distance < 20) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 11 cm. What happens?     (a) buzzer beeps (b) buzzer is silent
  16. 16.🤖 if (light < 400 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 240 and motion is not detected (false). What happens?     (a) porch lamp ON (b) porch lamp OFF
  17. 17.🤖 if (light < 300 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 440 and motion is detected (true). What happens?     (a) porch lamp ON (b) porch lamp OFF
  18. 18.🤖 if (temperature > 33) { show “Hot” } else if (temperature > 24) { show “Warm” } else { show “Cool” }
    The temperature is 35 °C. What is shown?     (a) Cool (b) Hot (c) Warm
  19. 19.🤖 if (temperature > 37) { show “Hot” } else if (temperature > 19) { show “Warm” } else { show “Cool” }
    The temperature is 20 °C. What is shown?     (a) Cool (b) Hot (c) Warm
  20. 20.🤖 if (light < 300 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 90 and motion is not detected (false). What happens?     (a) porch lamp OFF (b) porch lamp ON
  21. 21.🤖 if (temperature > 32) { fan ON } else { fan OFF }
    The temperature sensor reads 34 °C. What happens?     (a) fan OFF (b) fan ON
  22. 22.🤖 if (temperature > 31) { show “Hot” } else if (temperature > 18) { show “Warm” } else { show “Cool” }
    The temperature is 45 °C. What is shown?     (a) Warm (b) Cool (c) Hot
  23. 23.🤖 if (light < 400) { lamp ON } else { lamp OFF }
    The light sensor reads 389. What happens?     (a) lamp OFF (b) lamp ON
  24. 24.🤖 if (sound > 60) { red LED ON } else { green LED ON }
    The sound sensor reads 45. What happens?     (a) red LED ON (b) green LED ON
  25. 25.🤖 if (temperature > 37) { show “Hot” } else if (temperature > 20) { show “Warm” } else { show “Cool” }
    The temperature is 44 °C. What is shown?     (a) Cool (b) Hot (c) Warm
  26. 26.🤖 if (distance < 15) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 8 cm. What happens?     (a) buzzer is silent (b) buzzer beeps
  27. 27.🤖 if (temperature > 37) { show “Hot” } else if (temperature > 18) { show “Warm” } else { show “Cool” }
    The temperature is 14 °C. What is shown?     (a) Hot (b) Cool (c) Warm
  28. 28.🤖 if (temperature > 25) { fan ON } else { fan OFF }
    The temperature sensor reads 22 °C. What happens?     (a) fan OFF (b) fan ON
  29. 29.🤖 if (temperature > 30) { fan ON } else { fan OFF }
    The temperature sensor reads 36 °C. What happens?     (a) fan OFF (b) fan ON
  30. 30.🤖 if (temperature > 31) { show “Hot” } else if (temperature > 21) { show “Warm” } else { show “Cool” }
    The temperature is 22 °C. What is shown?     (a) Hot (b) Cool (c) Warm
  31. 31.🤖 if (moisture < 50) { pump ON } else { pump OFF }
    The soil moisture sensor reads 35 %. What happens?     (a) pump OFF (b) pump ON
  32. 32.🤖 if (moisture < 50) { pump ON } else { pump OFF }
    The soil moisture sensor reads 45 %. What happens?     (a) pump ON (b) pump OFF
  33. 33.🤖 if (distance < 30) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 39 cm. What happens?     (a) buzzer beeps (b) buzzer is silent
  34. 34.🤖 if (light < 500) { lamp ON } else { lamp OFF }
    The light sensor reads 352. What happens?     (a) lamp OFF (b) lamp ON
  35. 35.🤖 if (temperature > 35) { show “Hot” } else if (temperature > 20) { show “Warm” } else { show “Cool” }
    The temperature is 38 °C. What is shown?     (a) Warm (b) Cool (c) Hot
  36. 36.🤖 if (temperature > 38) { show “Hot” } else if (temperature > 19) { show “Warm” } else { show “Cool” }
    The temperature is 17 °C. What is shown?     (a) Cool (b) Warm (c) Hot
  37. 37.🤖 if (light < 500) { lamp ON } else { lamp OFF }
    The light sensor reads 473. What happens?     (a) lamp ON (b) lamp OFF
  38. 38.🤖 if (temperature > 36) { show “Hot” } else if (temperature > 21) { show “Warm” } else { show “Cool” }
    The temperature is 17 °C. What is shown?     (a) Hot (b) Warm (c) Cool
  39. 39.🤖 if (distance < 15) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 7 cm. What happens?     (a) buzzer beeps (b) buzzer is silent
  40. 40.🤖 if (temperature > 35) { show “Hot” } else if (temperature > 18) { show “Warm” } else { show “Cool” }
    The temperature is 20 °C. What is shown?     (a) Warm (b) Hot (c) Cool

Answer key

  1. green LED ON
  2. Warm
  3. red LED ON
  4. Hot
  5. both A and B are true
  6. buzzer beeps
  7. pump OFF
  8. Cool
  9. Hot
  10. porch lamp OFF
  11. pump ON
  12. the else part
  13. porch lamp OFF
  14. porch lamp OFF
  15. buzzer beeps
  16. porch lamp OFF
  17. porch lamp ON
  18. Hot
  19. Warm
  20. porch lamp ON
  21. fan ON
  22. Hot
  23. lamp ON
  24. green LED ON
  25. Hot
  26. buzzer beeps
  27. Cool
  28. fan OFF
  29. fan ON
  30. Warm
  31. pump ON
  32. pump ON
  33. buzzer is silent
  34. lamp ON
  35. Hot
  36. Cool
  37. lamp ON
  38. Cool
  39. buzzer beeps
  40. Warm

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