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Electronics Worksheet: If Else with Sensors

Electronics lesson 24: If / else with sensors · Set 897 · 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 (light < 400) { lamp ON } else { lamp OFF }
    The light sensor reads 448. What happens?     (a) lamp ON (b) lamp OFF
  2. 2.🤖 In “if (temp > 30)”, what runs when temp is exactly 30? (a) the else part (b) neither part (c) both parts (d) the if part
  3. 3.🤖 if (temperature > 30) { fan ON } else { fan OFF }
    The temperature sensor reads 34 °C. What happens?     (a) fan OFF (b) fan ON
  4. 4.🤖 if (temperature > 30) { show “Hot” } else if (temperature > 19) { show “Warm” } else { show “Cool” }
    The temperature is 20 °C. What is shown?     (a) Warm (b) Cool (c) Hot
  5. 5.🤖 if (temperature > 35) { show “Hot” } else if (temperature > 20) { show “Warm” } else { show “Cool” }
    The temperature is 23 °C. What is shown?     (a) Cool (b) Warm (c) Hot
  6. 6.🤖 if (moisture < 40) { pump ON } else { pump OFF }
    The soil moisture sensor reads 20 %. What happens?     (a) pump OFF (b) pump ON
  7. 7.🤖 if (light < 400 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 640 and motion is detected (true). What happens?     (a) porch lamp ON (b) porch lamp OFF
  8. 8.🤖 “if (A AND B)” is true when … (a) only A is true (b) only B is true (c) both A and B are true (d) both are false
  9. 9.🤖 if (light < 400 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 420 and motion is detected (true). What happens?     (a) porch lamp OFF (b) porch lamp ON
  10. 10.🤖 if (light < 200 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 530 and motion is not detected (false). What happens?     (a) porch lamp ON (b) porch lamp OFF
  11. 11.🤖 if (temperature > 36) { show “Hot” } else if (temperature > 20) { show “Warm” } else { show “Cool” }
    The temperature is 36 °C. What is shown?     (a) Hot (b) Cool (c) Warm
  12. 12.🤖 if (temperature > 33) { show “Hot” } else if (temperature > 24) { show “Warm” } else { show “Cool” }
    The temperature is 22 °C. What is shown?     (a) Cool (b) Warm (c) Hot
  13. 13.🤖 if (light < 200) { lamp ON } else { lamp OFF }
    The light sensor reads 121. What happens?     (a) lamp ON (b) lamp OFF
  14. 14.🤖 if (light < 400 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 510 and motion is not detected (false). What happens?     (a) porch lamp ON (b) porch lamp OFF
  15. 15.🤖 if (temperature > 37) { show “Hot” } else if (temperature > 20) { show “Warm” } else { show “Cool” }
    The temperature is 33 °C. What is shown?     (a) Hot (b) Cool (c) Warm
  16. 16.🤖 if (temperature > 38) { show “Hot” } else if (temperature > 21) { show “Warm” } else { show “Cool” }
    The temperature is 44 °C. What is shown?     (a) Warm (b) Hot (c) Cool
  17. 17.🤖 if (temperature > 38) { show “Hot” } else if (temperature > 21) { show “Warm” } else { show “Cool” }
    The temperature is 11 °C. What is shown?     (a) Warm (b) Cool (c) Hot
  18. 18.🤖 if (light < 200 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
  19. 19.🤖 if (moisture < 30) { pump ON } else { pump OFF }
    The soil moisture sensor reads 47 %. What happens?     (a) pump ON (b) pump OFF
  20. 20.🤖 if (light < 200 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 160 and motion is not detected (false). What happens?     (a) porch lamp ON (b) porch lamp OFF
  21. 21.🤖 if (light < 200) { lamp ON } else { lamp OFF }
    The light sensor reads 53. What happens?     (a) lamp ON (b) lamp OFF
  22. 22.🤖 if (light < 200 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 60 and motion is not detected (false). What happens?     (a) porch lamp ON (b) porch lamp OFF
  23. 23.🤖 if (light < 200) { lamp ON } else { lamp OFF }
    The light sensor reads 137. What happens?     (a) lamp ON (b) lamp OFF
  24. 24.🤖 if (temperature > 37) { show “Hot” } else if (temperature > 22) { show “Warm” } else { show “Cool” }
    The temperature is 10 °C. What is shown?     (a) Warm (b) Cool (c) Hot
  25. 25.🤖 if (temperature > 36) { show “Hot” } else if (temperature > 26) { show “Warm” } else { show “Cool” }
    The temperature is 30 °C. What is shown?     (a) Cool (b) Warm (c) Hot
  26. 26.🤖 if (temperature > 33) { show “Hot” } else if (temperature > 18) { show “Warm” } else { show “Cool” }
    The temperature is 26 °C. What is shown?     (a) Cool (b) Hot (c) Warm
  27. 27.🤖 if (temperature > 37) { show “Hot” } else if (temperature > 18) { show “Warm” } else { show “Cool” }
    The temperature is 19 °C. What is shown?     (a) Cool (b) Warm (c) Hot
  28. 28.🤖 if (sound > 70) { red LED ON } else { green LED ON }
    The sound sensor reads 72. What happens?     (a) green LED ON (b) red LED ON
  29. 29.🤖 if (light < 200 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 510 and motion is detected (true). What happens?     (a) porch lamp OFF (b) porch lamp ON
  30. 30.🤖 if (light < 400 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 340 and motion is not detected (false). What happens?     (a) porch lamp ON (b) porch lamp OFF
  31. 31.🤖 if (light < 200 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 180 and motion is not detected (false). What happens?     (a) porch lamp ON (b) porch lamp OFF
  32. 32.🤖 if (temperature > 30) { show “Hot” } else if (temperature > 24) { show “Warm” } else { show “Cool” }
    The temperature is 13 °C. What is shown?     (a) Hot (b) Cool (c) Warm
  33. 33.🤖 if (light < 400 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 320 and motion is detected (true). What happens?     (a) porch lamp OFF (b) porch lamp ON
  34. 34.🤖 if (sound > 70) { red LED ON } else { green LED ON }
    The sound sensor reads 56. What happens?     (a) green LED ON (b) red LED ON
  35. 35.🤖 if (sound > 60) { red LED ON } else { green LED ON }
    The sound sensor reads 53. What happens?     (a) red LED ON (b) green LED ON
  36. 36.🤖 if (light < 400 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 430 and motion is not detected (false). What happens?     (a) porch lamp ON (b) porch lamp OFF
  37. 37.🤖 if (temperature > 37) { show “Hot” } else if (temperature > 24) { show “Warm” } else { show “Cool” }
    The temperature is 33 °C. What is shown?     (a) Hot (b) Warm (c) Cool
  38. 38.🤖 if (temperature > 32) { show “Hot” } else if (temperature > 26) { show “Warm” } else { show “Cool” }
    The temperature is 39 °C. What is shown?     (a) Warm (b) Hot (c) Cool
  39. 39.🤖 if (moisture < 50) { pump ON } else { pump OFF }
    The soil moisture sensor reads 41 %. What happens?     (a) pump ON (b) pump OFF
  40. 40.🤖 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 OFF (b) porch lamp ON

Answer key

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

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