Electronics Worksheet: If Else with Sensors

Electronics lesson 24: If / else with sensors · Set 881 · 40 questions

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.

1. 1.🤖 if (sound > 70) { red LED ON } else { green LED ON }
   The sound sensor reads 78. What happens? (a) green LED ON (b) red LED ON
2. 2.🤖 if (light < 200 OR motion) { porch lamp ON } else { porch lamp OFF }
   The light reading is 190 and motion is detected (true). What happens? (a) porch lamp OFF (b) porch lamp ON
3. 3.🤖 if (light < 300 OR motion) { porch lamp ON } else { porch lamp OFF }
   The light reading is 120 and motion is not detected (false). What happens? (a) porch lamp ON (b) porch lamp OFF
4. 4.🤖 if (light < 200 AND motion) { porch lamp ON } else { porch lamp OFF }
   The light reading is 500 and motion is detected (true). What happens? (a) porch lamp ON (b) porch lamp OFF
5. 5.🤖 In “if (temp > 30)”, what runs when temp is exactly 30? (a) neither part (b) the else part (c) both parts (d) the if part
6. 6.🤖 if (moisture < 50) { pump ON } else { pump OFF }
   The soil moisture sensor reads 66 %. What happens? (a) pump ON (b) pump OFF
7. 7.🤖 if (light < 300 OR motion) { porch lamp ON } else { porch lamp OFF }
   The light reading is 560 and motion is not detected (false). What happens? (a) porch lamp ON (b) porch lamp OFF
8. 8.🤖 if (light < 200 OR motion) { porch lamp ON } else { porch lamp OFF }
   The light reading is 300 and motion is detected (true). What happens? (a) porch lamp ON (b) porch lamp OFF
9. 9.🤖 if (temperature > 38) { show “Hot” } else if (temperature > 19) { show “Warm” } else { show “Cool” }
   The temperature is 25 °C. What is shown? (a) Hot (b) Cool (c) Warm
10. 10.🤖 if (light < 200 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 360 and motion is detected (true). What happens? (a) porch lamp OFF (b) porch lamp ON
11. 11.🤖 if (temperature > 30) { show “Hot” } else if (temperature > 22) { show “Warm” } else { show “Cool” }
    The temperature is 26 °C. What is shown? (a) Cool (b) Warm (c) Hot
12. 12.🤖 if (distance < 10) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 17 cm. What happens? (a) buzzer beeps (b) buzzer is silent
13. 13.🤖 if (light < 500) { lamp ON } else { lamp OFF }
    The light sensor reads 519. 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 60 and motion is detected (true). What happens? (a) porch lamp OFF (b) porch lamp ON
15. 15.🤖 if (light < 200 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 130 and motion is not detected (false). What happens? (a) porch lamp ON (b) porch lamp OFF
16. 16.🤖 “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
17. 17.🤖 if (temperature > 30) { fan ON } else { fan OFF }
    The temperature sensor reads 25 °C. What happens? (a) fan ON (b) fan OFF
18. 18.🤖 if (temperature > 32) { show “Hot” } else if (temperature > 24) { show “Warm” } else { show “Cool” }
    The temperature is 33 °C. What is shown? (a) Warm (b) Cool (c) Hot
19. 19.🤖 if (light < 200 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 ON (b) porch lamp OFF
20. 20.🤖 if (temperature > 32) { show “Hot” } else if (temperature > 21) { show “Warm” } else { show “Cool” }
    The temperature is 36 °C. What is shown? (a) Warm (b) Cool (c) Hot
21. 21.🤖 if (light < 200 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 280 and motion is detected (true). What happens? (a) porch lamp OFF (b) porch lamp ON
22. 22.🤖 if (temperature > 35) { show “Hot” } else if (temperature > 23) { show “Warm” } else { show “Cool” }
    The temperature is 40 °C. What is shown? (a) Cool (b) Warm (c) Hot
23. 23.🤖 if (distance < 15) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 8 cm. What happens? (a) buzzer beeps (b) buzzer is silent
24. 24.🤖 if (light < 300 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 130 and motion is not detected (false). What happens? (a) porch lamp OFF (b) porch lamp ON
25. 25.🤖 if (light < 400 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 650 and motion is detected (true). What happens? (a) porch lamp ON (b) porch lamp OFF
26. 26.🤖 if (sound > 70) { red LED ON } else { green LED ON }
    The sound sensor reads 59. What happens? (a) red LED ON (b) green LED ON
27. 27.🤖 if (light < 500) { lamp ON } else { lamp OFF }
    The light sensor reads 542. What happens? (a) lamp OFF (b) lamp ON
28. 28.🤖 if (light < 400 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 360 and motion is not detected (false). What happens? (a) porch lamp OFF (b) porch lamp ON
29. 29.🤖 if (moisture < 50) { pump ON } else { pump OFF }
    The soil moisture sensor reads 58 %. What happens? (a) pump OFF (b) pump ON
30. 30.🤖 if (light < 300 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 170 and motion is detected (true). What happens? (a) porch lamp OFF (b) porch lamp ON
31. 31.🤖 if (temperature > 33) { show “Hot” } else if (temperature > 23) { show “Warm” } else { show “Cool” }
    The temperature is 24 °C. What is shown? (a) Hot (b) Cool (c) Warm
32. 32.🤖 if (temperature > 35) { show “Hot” } else if (temperature > 19) { show “Warm” } else { show “Cool” }
    The temperature is 23 °C. What is shown? (a) Hot (b) Warm (c) Cool
33. 33.🤖 if (sound > 80) { red LED ON } else { green LED ON }
    The sound sensor reads 67. What happens? (a) green LED ON (b) red LED ON
34. 34.🤖 if (temperature > 32) { show “Hot” } else if (temperature > 20) { show “Warm” } else { show “Cool” }
    The temperature is 19 °C. What is shown? (a) Hot (b) Warm (c) Cool
35. 35.🤖 if (temperature > 36) { show “Hot” } else if (temperature > 26) { show “Warm” } else { show “Cool” }
    The temperature is 34 °C. What is shown? (a) Warm (b) Hot (c) Cool
36. 36.🤖 if (temperature > 31) { show “Hot” } else if (temperature > 22) { show “Warm” } else { show “Cool” }
    The temperature is 33 °C. What is shown? (a) Warm (b) Hot (c) Cool
37. 37.🤖 if (temperature > 34) { show “Hot” } else if (temperature > 26) { show “Warm” } else { show “Cool” }
    The temperature is 42 °C. What is shown? (a) Warm (b) Cool (c) Hot
38. 38.🤖 if (light < 400 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
39. 39.🤖 if (moisture < 30) { pump ON } else { pump OFF }
    The soil moisture sensor reads 48 %. What happens? (a) pump ON (b) pump OFF
40. 40.🤖 if (moisture < 30) { pump ON } else { pump OFF }
    The soil moisture sensor reads 24 %. What happens? (a) pump ON (b) pump OFF

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