Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 270 · 40 questions

Remember (Measure it, then move it): Match the sensor to the quantity: light, heat, distance, movement, soil wetness, sound, gas or rain. Match the actuator to the action: spin (motor), exact angle (servo), beep (buzzer), light (LED), water (pump), numbers (display). Echo distance = 17 × echo time in ms (cm), because the sound goes there and back.

1. 1.Which job needs a buzzer? (a) show a status light (b) show the temperature (c) move water to plants (d) beep an alarm
2. 2.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) a servo motor (c) a pump (d) a motor
3. 3.Which job needs a motion sensor? (a) keep an incubator warm (b) start a fan when hot (c) spot someone walking in (d) open blinds at sunrise
4. 4.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
5. 5.Which job needs a temperature sensor? (a) switch on lamps at dusk (b) keep an incubator warm (c) stop a robot near walls (d) water a dry plant
6. 6.⚙️ Which actuator would you use to beep an alarm? (a) a motor (b) a buzzer (c) a servo motor (d) a pump
7. 7.⚙️ Which actuator would you use to show a status light? (a) a display (b) a servo motor (c) a motor (d) an LED
8. 8.Which job needs an LED? (a) open a gate to 90° (b) turn to an exact angle (c) show a status light (d) beep an alarm
9. 9.⚙️ Which actuator would you use to open a gate to 90°? (a) a display (b) a motor (c) a buzzer (d) a servo motor
10. 10.True or false: to keep an incubator warm, use a light sensor. (a) True (b) False
11. 11.Which job needs a motor? (a) beep an alarm (b) open a gate to 90° (c) move water to plants (d) spin a robot’s wheels
12. 12.🔍 Which sensor would you use to switch on with a clap? (a) a temperature sensor (b) a soil moisture sensor (c) a sound sensor (d) a motion sensor
13. 13.🔍 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
14. 14.🔍 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
15. 15.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
16. 16.Which job needs a pump? (a) open a gate to 90° (b) show a status light (c) spin a robot’s wheels (d) move water to plants
17. 17.True or false: to spot someone walking in, use a temperature sensor. (a) True (b) False
18. 18.🔍 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
19. 19.Which job needs a light sensor? (a) water a dry plant (b) open blinds at sunrise (c) spot someone walking in (d) start a fan when hot
20. 20.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a temperature sensor (c) a distance sensor (d) a light sensor
21. 21.🔍 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
22. 22.True or false: to stop a robot near walls, use a temperature sensor. (a) True (b) False
23. 23.🔍 Which sensor would you use to warn of a gas leak? (a) a sound sensor (b) a gas sensor (c) a distance sensor (d) a light sensor
24. 24.🔍 Which sensor would you use to switch on lamps at dusk? (a) a distance sensor (b) a soil moisture sensor (c) a light sensor (d) a temperature sensor
25. 25.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an output (c) an input (d) a power source
26. 26.Which job needs a rain sensor? (a) keep an incubator warm (b) switch on with a clap (c) close a window in rain (d) make a parking alarm
27. 27.True or false: to make a parking alarm, use a gas sensor. (a) True (b) False
28. 28.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a pump (c) a servo motor (d) a buzzer
29. 29.🔍 Which sensor would you use to make a parking alarm? (a) a soil moisture sensor (b) a distance sensor (c) a gas sensor (d) a light sensor
30. 30.True or false: to start a fan when hot, use a light sensor. (a) True (b) False
31. 31.Which job needs a gas sensor? (a) make a parking alarm (b) water a dry plant (c) open blinds at sunrise (d) warn of a gas leak
32. 32.Which job needs a distance sensor? (a) open blinds at sunrise (b) close a window in rain (c) stop a robot near walls (d) switch on with a clap
33. 33.Which job needs a servo motor? (a) show the temperature (b) turn to an exact angle (c) move water to plants (d) spin a robot’s wheels
34. 34.⚙️ What is an actuator? (a) an output that acts (b) a sensor (c) a battery (d) a program
35. 35.🔍 Which sensor would you use to close a window in rain? (a) a motion sensor (b) a light sensor (c) a rain sensor (d) a gas sensor
36. 36.True or false: to spot someone walking in, use a gas sensor. (a) True (b) False
37. 37.True or false: to close a window in rain, use a gas sensor. (a) False (b) True
38. 38.🔍 Which sensor would you use to keep an incubator warm? (a) a light sensor (b) a temperature sensor (c) a motion sensor (d) a distance sensor
39. 39.Which job needs a servo motor? (a) show a status light (b) open a gate to 90° (c) beep an alarm (d) show the temperature
40. 40.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a servo motor (c) a motor (d) a pump

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