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Electronics Worksheet: If Else with Sensors

Electronics lesson 24: If / else with sensors · Set 505 · 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 (A AND B)” is true when … (a) both are false (b) only A is true (c) only B is true (d) both A and B are true
  2. 2.🤖 if (distance < 20) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 19 cm. What happens?     (a) buzzer is silent (b) buzzer beeps
  3. 3.🤖 if (temperature > 25) { fan ON } else { fan OFF }
    The temperature sensor reads 23 °C. What happens?     (a) fan ON (b) fan OFF
  4. 4.🤖 if (light < 400) { lamp ON } else { lamp OFF }
    The light sensor reads 411. What happens?     (a) lamp OFF (b) lamp ON
  5. 5.🤖 In “if (temp > 30)”, what runs when temp is exactly 30? (a) both parts (b) the else part (c) the if part (d) neither part
  6. 6.🤖 if (distance < 30) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 21 cm. What happens?     (a) buzzer beeps (b) buzzer is silent
  7. 7.🤖 if (light < 400 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 360 and motion is detected (true). What happens?     (a) porch lamp ON (b) porch lamp OFF
  8. 8.🤖 if (light < 400 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 50 and motion is not detected (false). What happens?     (a) porch lamp ON (b) porch lamp OFF
  9. 9.🤖 if (temperature > 38) { show “Hot” } else if (temperature > 21) { show “Warm” } else { show “Cool” }
    The temperature is 33 °C. What is shown?     (a) Cool (b) Warm (c) Hot
  10. 10.🤖 if (temperature > 36) { show “Hot” } else if (temperature > 25) { show “Warm” } else { show “Cool” }
    The temperature is 32 °C. What is shown?     (a) Warm (b) Cool (c) Hot
  11. 11.🤖 if (moisture < 30) { pump ON } else { pump OFF }
    The soil moisture sensor reads 28 %. What happens?     (a) pump ON (b) pump OFF
  12. 12.🤖 if (moisture < 30) { pump ON } else { pump OFF }
    The soil moisture sensor reads 13 %. What happens?     (a) pump ON (b) pump OFF
  13. 13.🤖 if (temperature > 38) { show “Hot” } else if (temperature > 24) { show “Warm” } else { show “Cool” }
    The temperature is 14 °C. What is shown?     (a) Warm (b) Cool (c) Hot
  14. 14.🤖 if (moisture < 30) { pump ON } else { pump OFF }
    The soil moisture sensor reads 12 %. What happens?     (a) pump ON (b) pump OFF
  15. 15.🤖 if (temperature > 33) { show “Hot” } else if (temperature > 18) { show “Warm” } else { show “Cool” }
    The temperature is 12 °C. What is shown?     (a) Warm (b) Cool (c) Hot
  16. 16.🤖 if (moisture < 40) { pump ON } else { pump OFF }
    The soil moisture sensor reads 36 %. What happens?     (a) pump ON (b) pump OFF
  17. 17.🤖 if (temperature > 30) { fan ON } else { fan OFF }
    The temperature sensor reads 31 °C. What happens?     (a) fan OFF (b) fan ON
  18. 18.🤖 if (temperature > 30) { show “Hot” } else if (temperature > 20) { show “Warm” } else { show “Cool” }
    The temperature is 14 °C. What is shown?     (a) Warm (b) Cool (c) Hot
  19. 19.🤖 if (light < 500) { lamp ON } else { lamp OFF }
    The light sensor reads 437. What happens?     (a) lamp ON (b) lamp OFF
  20. 20.🤖 if (light < 300 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 520 and motion is detected (true). What happens?     (a) porch lamp ON (b) porch lamp OFF
  21. 21.🤖 if (light < 200 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 530 and motion is detected (true). What happens?     (a) porch lamp OFF (b) porch lamp ON
  22. 22.🤖 if (temperature > 37) { show “Hot” } else if (temperature > 25) { show “Warm” } else { show “Cool” }
    The temperature is 13 °C. What is shown?     (a) Hot (b) Cool (c) Warm
  23. 23.🤖 if (temperature > 31) { show “Hot” } else if (temperature > 24) { show “Warm” } else { show “Cool” }
    The temperature is 12 °C. What is shown?     (a) Warm (b) Cool (c) Hot
  24. 24.🤖 if (light < 200 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 330 and motion is detected (true). What happens?     (a) porch lamp ON (b) porch lamp OFF
  25. 25.🤖 if (sound > 60) { red LED ON } else { green LED ON }
    The sound sensor reads 74. What happens?     (a) red LED ON (b) green LED ON
  26. 26.🤖 if (distance < 20) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 15 cm. What happens?     (a) buzzer is silent (b) buzzer beeps
  27. 27.🤖 if (distance < 20) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 18 cm. What happens?     (a) buzzer is silent (b) buzzer beeps
  28. 28.🤖 if (light < 300 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 140 and motion is not detected (false). What happens?     (a) porch lamp OFF (b) porch lamp ON
  29. 29.🤖 if (temperature > 33) { show “Hot” } else if (temperature > 20) { show “Warm” } else { show “Cool” }
    The temperature is 14 °C. What is shown?     (a) Cool (b) Hot (c) Warm
  30. 30.🤖 if (moisture < 40) { pump ON } else { pump OFF }
    The soil moisture sensor reads 54 %. What happens?     (a) pump OFF (b) pump ON
  31. 31.🤖 if (temperature > 34) { show “Hot” } else if (temperature > 19) { show “Warm” } else { show “Cool” }
    The temperature is 16 °C. What is shown?     (a) Hot (b) Warm (c) Cool
  32. 32.🤖 if (light < 300 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 300 and motion is detected (true). What happens?     (a) porch lamp OFF (b) porch lamp ON
  33. 33.🤖 if (temperature > 32) { fan ON } else { fan OFF }
    The temperature sensor reads 28 °C. What happens?     (a) fan ON (b) fan OFF
  34. 34.🤖 if (temperature > 32) { show “Hot” } else if (temperature > 26) { show “Warm” } else { show “Cool” }
    The temperature is 43 °C. What is shown?     (a) Warm (b) Cool (c) Hot
  35. 35.🤖 if (temperature > 34) { show “Hot” } else if (temperature > 22) { show “Warm” } else { show “Cool” }
    The temperature is 10 °C. What is shown?     (a) Cool (b) Hot (c) Warm
  36. 36.🤖 if (light < 300 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 410 and motion is not detected (false). What happens?     (a) porch lamp OFF (b) porch lamp ON
  37. 37.🤖 if (light < 300 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 470 and motion is detected (true). What happens?     (a) porch lamp ON (b) porch lamp OFF
  38. 38.🤖 if (light < 300 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 520 and motion is detected (true). What happens?     (a) porch lamp ON (b) porch lamp OFF
  39. 39.🤖 if (light < 300 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 70 and motion is detected (true). What happens?     (a) porch lamp OFF (b) porch lamp ON
  40. 40.🤖 if (sound > 60) { red LED ON } else { green LED ON }
    The sound sensor reads 40. What happens?     (a) red LED ON (b) green LED ON

Answer key

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

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