Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 77 · 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.True or false: to water a dry plant, use a light sensor. (a) False (b) True
2. 2.Which job needs a servo motor? (a) turn to an exact angle (b) spin a robot’s wheels (c) show the temperature (d) show a status light
3. 3.True or false: to switch on with a clap, use a temperature sensor. (a) True (b) False
4. 4.Which job needs a light sensor? (a) measure classroom noise (b) spot someone walking in (c) make a parking alarm (d) switch on lamps at dusk
5. 5.🔍 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
6. 6.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a gas sensor (c) a soil moisture sensor (d) a sound sensor
7. 7.Which job needs a buzzer? (a) turn to an exact angle (b) show the temperature (c) show a status light (d) beep an alarm
8. 8.Which job needs a motor? (a) show a status light (b) spin a robot’s wheels (c) move water to plants (d) open a gate to 90°
9. 9.True or false: to start a fan when hot, use a distance sensor. (a) True (b) False
10. 10.True or false: to keep an incubator warm, use a gas sensor. (a) True (b) False
11. 11.True or false: to stop a robot near walls, use a gas sensor. (a) False (b) True
12. 12.⚙️ What is an actuator? (a) a sensor (b) a program (c) an output that acts (d) a battery
13. 13.Which job needs a rain sensor? (a) close a window in rain (b) open blinds at sunrise (c) warn of a gas leak (d) stop a robot near walls
14. 14.🔍 Which sensor would you use to start a fan when hot? (a) a gas sensor (b) a temperature sensor (c) a sound sensor (d) a light sensor
15. 15.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a light sensor (c) a sound sensor (d) a soil moisture sensor
16. 16.True or false: to spot someone walking in, use a soil moisture sensor. (a) True (b) False
17. 17.🔍 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
18. 18.🔍 Which sensor would you use to open blinds at sunrise? (a) a motion sensor (b) a distance sensor (c) a soil moisture sensor (d) a light sensor
19. 19.🔍 Which sensor would you use to spot someone walking in? (a) a light sensor (b) a distance sensor (c) a motion sensor (d) a rain sensor
20. 20.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a servo motor (c) a display (d) a motor
21. 21.🔍 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
22. 22.🔍 Which sensor would you use to water a dry plant? (a) a distance sensor (b) a sound sensor (c) a soil moisture sensor (d) a rain sensor
23. 23.🔍 Which sensor would you use to make a parking alarm? (a) a sound sensor (b) a gas sensor (c) a temperature sensor (d) a distance sensor
24. 24.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
25. 25.True or false: to switch on lamps at dusk, use a motion sensor. (a) True (b) False
26. 26.Which job needs a sound sensor? (a) stop a robot near walls (b) start a fan when hot (c) spot someone walking in (d) switch on with a clap
27. 27.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a light sensor (c) a gas sensor (d) a rain sensor
28. 28.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a servo motor (c) a motor (d) a display
29. 29.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) a buzzer (c) an LED (d) a motor
30. 30.🔍 Which sensor would you use to switch on lamps at dusk? (a) a soil moisture sensor (b) a light sensor (c) a temperature sensor (d) a distance sensor
31. 31.🔍 Which sensor would you use to measure classroom noise? (a) a soil moisture sensor (b) a motion sensor (c) a sound sensor (d) a rain sensor
32. 32.🔍 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
33. 33.Which job needs a gas sensor? (a) measure classroom noise (b) warn of a gas leak (c) spot someone walking in (d) close a window in rain
34. 34.🔍 Which sensor would you use to warn of a gas leak? (a) a rain sensor (b) a gas sensor (c) a sound sensor (d) a light sensor
35. 35.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) an LED (c) a servo motor (d) a buzzer
36. 36.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) an LED (c) a motor (d) a pump
37. 37.True or false: to make a parking alarm, use a sound sensor. (a) False (b) True
38. 38.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
39. 39.🔍 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
40. 40.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an input (c) a power source (d) an output

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