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Electronics Worksheet: If Else with Sensors

Electronics lesson 24: If / else with sensors · Set 208 · 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 (temperature > 25) { fan ON } else { fan OFF }
    The temperature sensor reads 30 °C. What happens?     (a) fan OFF (b) fan ON
  2. 2.🤖 if (distance < 20) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 14 cm. What happens?     (a) buzzer is silent (b) buzzer beeps
  3. 3.🤖 In “if (temp > 30)”, what runs when temp is exactly 30? (a) both parts (b) neither part (c) the else part (d) the if part
  4. 4.🤖 if (light < 200 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 280 and motion is not detected (false). What happens?     (a) porch lamp ON (b) porch lamp OFF
  5. 5.🤖 if (temperature > 25) { fan ON } else { fan OFF }
    The temperature sensor reads 21 °C. What happens?     (a) fan OFF (b) fan ON
  6. 6.🤖 if (distance < 20) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 16 cm. What happens?     (a) buzzer is silent (b) buzzer beeps
  7. 7.🤖 if (temperature > 33) { show “Hot” } else if (temperature > 24) { show “Warm” } else { show “Cool” }
    The temperature is 40 °C. What is shown?     (a) Cool (b) Warm (c) Hot
  8. 8.🤖 if (temperature > 36) { show “Hot” } else if (temperature > 21) { show “Warm” } else { show “Cool” }
    The temperature is 33 °C. What is shown?     (a) Hot (b) Cool (c) Warm
  9. 9.🤖 if (light < 300 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 60 and motion is detected (true). What happens?     (a) porch lamp OFF (b) porch lamp ON
  10. 10.🤖 if (temperature > 30) { show “Hot” } else if (temperature > 21) { show “Warm” } else { show “Cool” }
    The temperature is 25 °C. What is shown?     (a) Cool (b) Warm (c) Hot
  11. 11.🤖 if (light < 200 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 340 and motion is detected (true). What happens?     (a) porch lamp ON (b) porch lamp OFF
  12. 12.🤖 if (temperature > 31) { show “Hot” } else if (temperature > 23) { show “Warm” } else { show “Cool” }
    The temperature is 14 °C. What is shown?     (a) Hot (b) Warm (c) Cool
  13. 13.🤖 if (temperature > 31) { show “Hot” } else if (temperature > 23) { show “Warm” } else { show “Cool” }
    The temperature is 23 °C. What is shown?     (a) Hot (b) Cool (c) Warm
  14. 14.🤖 “if (A AND B)” is true when … (a) both A and B are true (b) only A is true (c) both are false (d) only B is true
  15. 15.🤖 if (light < 400) { lamp ON } else { lamp OFF }
    The light sensor reads 474. What happens?     (a) lamp ON (b) lamp OFF
  16. 16.🤖 if (distance < 30) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 35 cm. What happens?     (a) buzzer is silent (b) buzzer beeps
  17. 17.🤖 if (light < 400 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 70 and motion is not detected (false). What happens?     (a) porch lamp OFF (b) porch lamp ON
  18. 18.🤖 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
  19. 19.🤖 if (temperature > 30) { show “Hot” } else if (temperature > 18) { show “Warm” } else { show “Cool” }
    The temperature is 17 °C. What is shown?     (a) Hot (b) Cool (c) Warm
  20. 20.🤖 if (moisture < 50) { pump ON } else { pump OFF }
    The soil moisture sensor reads 44 %. What happens?     (a) pump ON (b) pump OFF
  21. 21.🤖 if (temperature > 38) { show “Hot” } else if (temperature > 25) { show “Warm” } else { show “Cool” }
    The temperature is 20 °C. What is shown?     (a) Warm (b) Hot (c) Cool
  22. 22.🤖 if (temperature > 30) { show “Hot” } else if (temperature > 18) { show “Warm” } else { show “Cool” }
    The temperature is 31 °C. What is shown?     (a) Warm (b) Hot (c) Cool
  23. 23.🤖 if (temperature > 38) { show “Hot” } else if (temperature > 19) { show “Warm” } else { show “Cool” }
    The temperature is 39 °C. What is shown?     (a) Warm (b) Hot (c) Cool
  24. 24.🤖 if (temperature > 35) { show “Hot” } else if (temperature > 18) { show “Warm” } else { show “Cool” }
    The temperature is 33 °C. What is shown?     (a) Cool (b) Hot (c) Warm
  25. 25.🤖 if (distance < 10) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 1 cm. What happens?     (a) buzzer is silent (b) buzzer beeps
  26. 26.🤖 if (distance < 10) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 18 cm. What happens?     (a) buzzer beeps (b) buzzer is silent
  27. 27.🤖 if (temperature > 33) { show “Hot” } else if (temperature > 26) { show “Warm” } else { show “Cool” }
    The temperature is 15 °C. What is shown?     (a) Warm (b) Hot (c) Cool
  28. 28.🤖 if (light < 200) { lamp ON } else { lamp OFF }
    The light sensor reads 328. What happens?     (a) lamp OFF (b) lamp ON
  29. 29.🤖 if (temperature > 37) { show “Hot” } else if (temperature > 25) { show “Warm” } else { show “Cool” }
    The temperature is 38 °C. What is shown?     (a) Hot (b) Warm (c) Cool
  30. 30.🤖 if (temperature > 33) { show “Hot” } else if (temperature > 22) { show “Warm” } else { show “Cool” }
    The temperature is 16 °C. What is shown?     (a) Hot (b) Warm (c) Cool
  31. 31.🤖 if (temperature > 30) { show “Hot” } else if (temperature > 21) { show “Warm” } else { show “Cool” }
    The temperature is 33 °C. What is shown?     (a) Warm (b) Cool (c) Hot
  32. 32.🤖 if (temperature > 31) { show “Hot” } else if (temperature > 23) { show “Warm” } else { show “Cool” }
    The temperature is 11 °C. What is shown?     (a) Warm (b) Hot (c) Cool
  33. 33.🤖 if (temperature > 34) { show “Hot” } else if (temperature > 21) { show “Warm” } else { show “Cool” }
    The temperature is 28 °C. What is shown?     (a) Warm (b) Cool (c) Hot
  34. 34.🤖 if (temperature > 32) { show “Hot” } else if (temperature > 22) { show “Warm” } else { show “Cool” }
    The temperature is 35 °C. What is shown?     (a) Hot (b) Warm (c) Cool
  35. 35.🤖 if (temperature > 33) { show “Hot” } else if (temperature > 24) { show “Warm” } else { show “Cool” }
    The temperature is 22 °C. What is shown?     (a) Hot (b) Cool (c) Warm
  36. 36.🤖 if (temperature > 32) { show “Hot” } else if (temperature > 26) { show “Warm” } else { show “Cool” }
    The temperature is 15 °C. What is shown?     (a) Warm (b) Cool (c) Hot
  37. 37.🤖 if (light < 200) { lamp ON } else { lamp OFF }
    The light sensor reads 299. What happens?     (a) lamp OFF (b) lamp ON
  38. 38.🤖 if (sound > 70) { red LED ON } else { green LED ON }
    The sound sensor reads 76. What happens?     (a) red LED ON (b) green LED ON
  39. 39.🤖 if (temperature > 36) { show “Hot” } else if (temperature > 24) { show “Warm” } else { show “Cool” }
    The temperature is 27 °C. What is shown?     (a) Hot (b) Cool (c) Warm
  40. 40.🤖 if (light < 300 AND 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

Answer key

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

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