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Electronics Worksheet: If Else with Sensors

Electronics lesson 24: If / else with sensors · Set 304 · 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 (moisture < 50) { pump ON } else { pump OFF }
    The soil moisture sensor reads 64 %. What happens?     (a) pump OFF (b) pump ON
  2. 2.🤖 if (temperature > 25) { fan ON } else { fan OFF }
    The temperature sensor reads 21 °C. What happens?     (a) fan ON (b) fan OFF
  3. 3.🤖 if (temperature > 38) { show “Hot” } else if (temperature > 19) { show “Warm” } else { show “Cool” }
    The temperature is 18 °C. What is shown?     (a) Cool (b) Hot (c) Warm
  4. 4.🤖 if (sound > 70) { red LED ON } else { green LED ON }
    The sound sensor reads 70. What happens?     (a) green LED ON (b) red LED ON
  5. 5.🤖 In “if (temp > 30)”, what runs when temp is exactly 30? (a) both parts (b) neither part (c) the if part (d) the else part
  6. 6.🤖 if (moisture < 40) { pump ON } else { pump OFF }
    The soil moisture sensor reads 39 %. What happens?     (a) pump OFF (b) pump ON
  7. 7.🤖 if (temperature > 32) { fan ON } else { fan OFF }
    The temperature sensor reads 33 °C. What happens?     (a) fan OFF (b) fan ON
  8. 8.🤖 “if (A AND B)” is true when … (a) only B is true (b) both are false (c) both A and B are true (d) only A is true
  9. 9.🤖 if (moisture < 40) { pump ON } else { pump OFF }
    The soil moisture sensor reads 36 %. What happens?     (a) pump ON (b) pump OFF
  10. 10.🤖 if (distance < 10) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 7 cm. What happens?     (a) buzzer beeps (b) buzzer is silent
  11. 11.🤖 if (distance < 30) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 32 cm. What happens?     (a) buzzer is silent (b) buzzer beeps
  12. 12.🤖 if (light < 300 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 500 and motion is not detected (false). What happens?     (a) porch lamp ON (b) porch lamp OFF
  13. 13.🤖 if (light < 400 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 340 and motion is detected (true). What happens?     (a) porch lamp OFF (b) porch lamp ON
  14. 14.🤖 if (moisture < 30) { pump ON } else { pump OFF }
    The soil moisture sensor reads 37 %. What happens?     (a) pump ON (b) pump OFF
  15. 15.🤖 if (temperature > 36) { show “Hot” } else if (temperature > 23) { show “Warm” } else { show “Cool” }
    The temperature is 35 °C. What is shown?     (a) Cool (b) Warm (c) Hot
  16. 16.🤖 if (light < 400 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 250 and motion is detected (true). What happens?     (a) porch lamp ON (b) porch lamp OFF
  17. 17.🤖 if (temperature > 31) { show “Hot” } else if (temperature > 24) { show “Warm” } else { show “Cool” }
    The temperature is 13 °C. What is shown?     (a) Hot (b) Warm (c) Cool
  18. 18.🤖 if (temperature > 37) { show “Hot” } else if (temperature > 19) { show “Warm” } else { show “Cool” }
    The temperature is 23 °C. What is shown?     (a) Cool (b) Warm (c) Hot
  19. 19.🤖 if (temperature > 33) { show “Hot” } else if (temperature > 24) { show “Warm” } else { show “Cool” }
    The temperature is 36 °C. What is shown?     (a) Cool (b) Hot (c) Warm
  20. 20.🤖 if (light < 400 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 470 and motion is not detected (false). What happens?     (a) porch lamp ON (b) porch lamp OFF
  21. 21.🤖 if (light < 300 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 490 and motion is not detected (false). What happens?     (a) porch lamp ON (b) porch lamp OFF
  22. 22.🤖 if (temperature > 32) { show “Hot” } else if (temperature > 19) { show “Warm” } else { show “Cool” }
    The temperature is 14 °C. What is shown?     (a) Hot (b) Warm (c) Cool
  23. 23.🤖 if (light < 300) { lamp ON } else { lamp OFF }
    The light sensor reads 368. What happens?     (a) lamp OFF (b) lamp ON
  24. 24.🤖 if (light < 400) { lamp ON } else { lamp OFF }
    The light sensor reads 449. What happens?     (a) lamp OFF (b) lamp ON
  25. 25.🤖 if (moisture < 30) { pump ON } else { pump OFF }
    The soil moisture sensor reads 16 %. What happens?     (a) pump OFF (b) pump ON
  26. 26.🤖 if (temperature > 35) { show “Hot” } else if (temperature > 20) { show “Warm” } else { show “Cool” }
    The temperature is 18 °C. What is shown?     (a) Cool (b) Hot (c) Warm
  27. 27.🤖 if (temperature > 31) { show “Hot” } else if (temperature > 20) { show “Warm” } else { show “Cool” }
    The temperature is 10 °C. What is shown?     (a) Hot (b) Warm (c) Cool
  28. 28.🤖 if (sound > 80) { red LED ON } else { green LED ON }
    The sound sensor reads 87. What happens?     (a) green LED ON (b) red LED ON
  29. 29.🤖 if (temperature > 35) { show “Hot” } else if (temperature > 20) { show “Warm” } else { show “Cool” }
    The temperature is 39 °C. What is shown?     (a) Warm (b) Hot (c) Cool
  30. 30.🤖 if (distance < 30) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 21 cm. What happens?     (a) buzzer beeps (b) buzzer is silent
  31. 31.🤖 if (temperature > 32) { fan ON } else { fan OFF }
    The temperature sensor reads 32 °C. What happens?     (a) fan OFF (b) fan ON
  32. 32.🤖 if (temperature > 32) { fan ON } else { fan OFF }
    The temperature sensor reads 39 °C. What happens?     (a) fan OFF (b) fan ON
  33. 33.🤖 if (temperature > 32) { fan ON } else { fan OFF }
    The temperature sensor reads 37 °C. What happens?     (a) fan OFF (b) fan ON
  34. 34.🤖 if (moisture < 50) { pump ON } else { pump OFF }
    The soil moisture sensor reads 61 %. What happens?     (a) pump OFF (b) pump ON
  35. 35.🤖 if (temperature > 34) { show “Hot” } else if (temperature > 18) { show “Warm” } else { show “Cool” }
    The temperature is 12 °C. What is shown?     (a) Hot (b) Warm (c) Cool
  36. 36.🤖 if (temperature > 31) { show “Hot” } else if (temperature > 22) { show “Warm” } else { show “Cool” }
    The temperature is 39 °C. What is shown?     (a) Cool (b) Warm (c) Hot
  37. 37.🤖 if (distance < 15) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 7 cm. What happens?     (a) buzzer is silent (b) buzzer beeps
  38. 38.🤖 if (distance < 30) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 28 cm. What happens?     (a) buzzer beeps (b) buzzer is silent
  39. 39.🤖 if (light < 300) { lamp ON } else { lamp OFF }
    The light sensor reads 236. What happens?     (a) lamp ON (b) lamp OFF
  40. 40.🤖 if (light < 300 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 180 and motion is detected (true). What happens?     (a) porch lamp ON (b) porch lamp OFF

Answer key

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

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