Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 255 · 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.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an output (c) an input (d) a power source
2. 2.True or false: to switch on with a clap, use a temperature sensor. (a) True (b) False
3. 3.True or false: to make a parking alarm, use a light sensor. (a) True (b) False
4. 4.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a pump (c) a servo motor (d) a display
5. 5.Which job needs a soil moisture sensor? (a) switch on with a clap (b) stop a robot near walls (c) spot someone walking in (d) water a dry plant
6. 6.🔍 Which sensor would you use to spot someone walking in? (a) a soil moisture sensor (b) a temperature sensor (c) a rain sensor (d) a motion sensor
7. 7.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a display (c) a motor (d) a buzzer
8. 8.True or false: to switch on lamps at dusk, use a sound sensor. (a) False (b) True
9. 9.🔍 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)?
10. 10.🔍 Which sensor would you use to switch on with a clap? (a) a distance sensor (b) a gas sensor (c) a sound sensor (d) a motion sensor
11. 11.Which job needs a rain sensor? (a) close a window in rain (b) switch on with a clap (c) open blinds at sunrise (d) warn of a gas leak
12. 12.Which job needs a sound sensor? (a) water a dry plant (b) switch on with a clap (c) make a parking alarm (d) open blinds at sunrise
13. 13.🔍 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
14. 14.⚙️ What is an actuator? (a) a program (b) a sensor (c) an output that acts (d) a battery
15. 15.🔍 Which sensor would you use to switch on lamps at dusk? (a) a rain sensor (b) a gas sensor (c) a sound sensor (d) a light sensor
16. 16.🔍 Which sensor would you use to close a window in rain? (a) a soil moisture sensor (b) a gas sensor (c) a sound sensor (d) a rain sensor
17. 17.🔍 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
18. 18.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a servo motor (c) an LED (d) a display
19. 19.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
20. 20.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
21. 21.Which job needs a gas sensor? (a) spot someone walking in (b) warn of a gas leak (c) switch on lamps at dusk (d) start a fan when hot
22. 22.🔍 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?
23. 23.True or false: to make a parking alarm, use a soil moisture sensor. (a) False (b) True
24. 24.Which job needs an LED? (a) open a gate to 90° (b) beep an alarm (c) move water to plants (d) show a status light
25. 25.Which job needs a display? (a) turn to an exact angle (b) show a status light (c) open a gate to 90° (d) show the temperature
26. 26.True or false: to water a dry plant, use a soil moisture sensor. (a) True (b) False
27. 27.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
28. 28.Which job needs a light sensor? (a) stop a robot near walls (b) switch on with a clap (c) switch on lamps at dusk (d) start a fan when hot
29. 29.Which job needs a temperature sensor? (a) open blinds at sunrise (b) measure classroom noise (c) start a fan when hot (d) close a window in rain
30. 30.Which job needs a motion sensor? (a) spot someone walking in (b) switch on with a clap (c) keep an incubator warm (d) start a fan when hot
31. 31.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a light sensor (c) a temperature sensor (d) a rain sensor
32. 32.Which job needs a pump? (a) beep an alarm (b) spin a robot’s wheels (c) open a gate to 90° (d) move water to plants
33. 33.True or false: to stop a robot near walls, use a rain sensor. (a) False (b) True
34. 34.True or false: to switch on with a clap, use a rain sensor. (a) False (b) True
35. 35.🔍 Which sensor would you use to water a dry plant? (a) a motion sensor (b) a sound sensor (c) a gas sensor (d) a soil moisture sensor
36. 36.⚙️ Which actuator would you use to show a status light? (a) a pump (b) a display (c) an LED (d) a servo motor
37. 37.🔍 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
38. 38.🔍 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
39. 39.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
40. 40.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a display (c) a pump (d) a servo motor

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