Electronics Worksheet: If Else with Sensors

Electronics lesson 24: If / else with sensors · Set 3 · 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 (temperature > 30) { fan ON } else { fan OFF }
   The temperature sensor reads 23 °C. What happens? (a) fan OFF (b) fan ON
2. 2.🤖 if (light < 400 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
3. 3.🤖 if (temperature > 36) { show “Hot” } else if (temperature > 20) { show “Warm” } else { show “Cool” }
   The temperature is 39 °C. What is shown? (a) Hot (b) Cool (c) Warm
4. 4.🤖 if (light < 400 AND motion) { porch lamp ON } else { porch lamp OFF }
   The light reading is 350 and motion is not detected (false). What happens? (a) porch lamp OFF (b) porch lamp ON
5. 5.🤖 if (temperature > 33) { show “Hot” } else if (temperature > 18) { show “Warm” } else { show “Cool” }
   The temperature is 38 °C. What is shown? (a) Hot (b) Warm (c) Cool
6. 6.🤖 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
7. 7.🤖 if (temperature > 30) { show “Hot” } else if (temperature > 22) { show “Warm” } else { show “Cool” }
   The temperature is 32 °C. What is shown? (a) Cool (b) Hot (c) Warm
8. 8.🤖 if (temperature > 38) { show “Hot” } else if (temperature > 22) { show “Warm” } else { show “Cool” }
   The temperature is 34 °C. What is shown? (a) Warm (b) Hot (c) Cool
9. 9.🤖 if (light < 200 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 OFF (b) porch lamp ON
10. 10.🤖 if (light < 200 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 640 and motion is not detected (false). What happens? (a) porch lamp ON (b) porch lamp OFF
11. 11.🤖 if (light < 200 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 130 and motion is detected (true). What happens? (a) porch lamp ON (b) porch lamp OFF
12. 12.🤖 if (moisture < 30) { pump ON } else { pump OFF }
    The soil moisture sensor reads 26 %. What happens? (a) pump ON (b) pump OFF
13. 13.🤖 if (light < 200) { lamp ON } else { lamp OFF }
    The light sensor reads 96. What happens? (a) lamp OFF (b) lamp ON
14. 14.🤖 if (temperature > 32) { show “Hot” } else if (temperature > 23) { show “Warm” } else { show “Cool” }
    The temperature is 17 °C. What is shown? (a) Warm (b) Cool (c) Hot
15. 15.🤖 if (distance < 20) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 17 cm. What happens? (a) buzzer beeps (b) buzzer is silent
16. 16.🤖 if (distance < 30) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 34 cm. What happens? (a) buzzer beeps (b) buzzer is silent
17. 17.🤖 if (temperature > 25) { fan ON } else { fan OFF }
    The temperature sensor reads 17 °C. What happens? (a) fan OFF (b) fan ON
18. 18.🤖 if (temperature > 25) { fan ON } else { fan OFF }
    The temperature sensor reads 20 °C. What happens? (a) fan ON (b) fan OFF
19. 19.🤖 if (light < 400) { lamp ON } else { lamp OFF }
    The light sensor reads 416. What happens? (a) lamp ON (b) lamp OFF
20. 20.🤖 if (temperature > 25) { fan ON } else { fan OFF }
    The temperature sensor reads 22 °C. What happens? (a) fan ON (b) fan OFF
21. 21.🤖 if (light < 200 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 140 and motion is not detected (false). What happens? (a) porch lamp ON (b) porch lamp OFF
22. 22.🤖 if (light < 200 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 OFF (b) porch lamp ON
23. 23.🤖 if (temperature > 36) { show “Hot” } else if (temperature > 20) { show “Warm” } else { show “Cool” }
    The temperature is 19 °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 not detected (false). What happens? (a) porch lamp OFF (b) porch lamp ON
25. 25.🤖 “if (A AND B)” is true when … (a) only B is true (b) both are false (c) only A is true (d) both A and B are true
26. 26.🤖 if (sound > 80) { red LED ON } else { green LED ON }
    The sound sensor reads 87. What happens? (a) red LED ON (b) green LED ON
27. 27.🤖 if (temperature > 31) { show “Hot” } else if (temperature > 18) { show “Warm” } else { show “Cool” }
    The temperature is 16 °C. What is shown? (a) Cool (b) Hot (c) Warm
28. 28.🤖 if (light < 200) { lamp ON } else { lamp OFF }
    The light sensor reads 183. What happens? (a) lamp OFF (b) lamp ON
29. 29.🤖 if (moisture < 50) { pump ON } else { pump OFF }
    The soil moisture sensor reads 45 %. What happens? (a) pump OFF (b) pump ON
30. 30.🤖 if (temperature > 33) { show “Hot” } else if (temperature > 19) { show “Warm” } else { show “Cool” }
    The temperature is 19 °C. What is shown? (a) Warm (b) Hot (c) Cool
31. 31.🤖 if (temperature > 30) { fan ON } else { fan OFF }
    The temperature sensor reads 34 °C. What happens? (a) fan OFF (b) fan ON
32. 32.🤖 if (light < 500) { lamp ON } else { lamp OFF }
    The light sensor reads 476. What happens? (a) lamp OFF (b) lamp ON
33. 33.🤖 if (temperature > 33) { show “Hot” } else if (temperature > 25) { show “Warm” } else { show “Cool” }
    The temperature is 18 °C. What is shown? (a) Hot (b) Cool (c) Warm
34. 34.🤖 if (light < 200 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 580 and motion is not detected (false). What happens? (a) porch lamp ON (b) porch lamp OFF
35. 35.🤖 if (light < 200 OR 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
36. 36.🤖 if (temperature > 31) { show “Hot” } else if (temperature > 26) { show “Warm” } else { show “Cool” }
    The temperature is 26 °C. What is shown? (a) Cool (b) Hot (c) Warm
37. 37.🤖 if (temperature > 32) { show “Hot” } else if (temperature > 19) { show “Warm” } else { show “Cool” }
    The temperature is 22 °C. What is shown? (a) Hot (b) Cool (c) Warm
38. 38.🤖 if (sound > 70) { red LED ON } else { green LED ON }
    The sound sensor reads 53. What happens? (a) green LED ON (b) red LED ON
39. 39.🤖 if (temperature > 37) { show “Hot” } else if (temperature > 19) { show “Warm” } else { show “Cool” }
    The temperature is 45 °C. What is shown? (a) Cool (b) Warm (c) Hot
40. 40.🤖 if (temperature > 35) { show “Hot” } else if (temperature > 19) { show “Warm” } else { show “Cool” }
    The temperature is 19 °C. What is shown? (a) Warm (b) Cool (c) Hot

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