Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 343 · 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 sound sensor? (a) switch on lamps at dusk (b) keep an incubator warm (c) stop a robot near walls (d) measure classroom noise
2. 2.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) a display (c) an LED (d) a motor
3. 3.⚙️ Which actuator would you use to beep an alarm? (a) a pump (b) a buzzer (c) an LED (d) a motor
4. 4.Which job needs a soil moisture sensor? (a) water a dry plant (b) stop a robot near walls (c) make a parking alarm (d) close a window in rain
5. 5.Which job needs a buzzer? (a) turn to an exact angle (b) show a status light (c) beep an alarm (d) open a gate to 90°
6. 6.True or false: to keep an incubator warm, use a motion sensor. (a) False (b) True
7. 7.Which job needs a motor? (a) show the temperature (b) open a gate to 90° (c) spin a robot’s wheels (d) turn to an exact angle
8. 8.Which job needs a distance sensor? (a) stop a robot near walls (b) open blinds at sunrise (c) keep an incubator warm (d) switch on with a clap
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.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a fuse (d) a power source
11. 11.Which job needs a pump? (a) move water to plants (b) spin a robot’s wheels (c) open a gate to 90° (d) beep an alarm
12. 12.Which job needs a light sensor? (a) water a dry plant (b) open blinds at sunrise (c) start a fan when hot (d) make a parking alarm
13. 13.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) an LED (c) a pump (d) a buzzer
14. 14.🔍 Which sensor would you use to close a window in rain? (a) a motion sensor (b) a rain sensor (c) a gas sensor (d) a soil moisture sensor
15. 15.Which job needs a motion sensor? (a) stop a robot near walls (b) start a fan when hot (c) water a dry plant (d) spot someone walking in
16. 16.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
17. 17.🔍 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
18. 18.🔍 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
19. 19.🔍 Which sensor would you use to keep an incubator warm? (a) a soil moisture sensor (b) a motion sensor (c) a gas sensor (d) a temperature sensor
20. 20.🔍 Which sensor would you use to switch on lamps at dusk? (a) a distance sensor (b) a light sensor (c) a soil moisture sensor (d) a temperature sensor
21. 21.True or false: to water a dry plant, use a soil moisture sensor. (a) True (b) False
22. 22.Which job needs a rain sensor? (a) warn of a gas leak (b) open blinds at sunrise (c) switch on with a clap (d) close a window in rain
23. 23.Which job needs a gas sensor? (a) make a parking alarm (b) warn of a gas leak (c) water a dry plant (d) stop a robot near walls
24. 24.🔍 Which sensor would you use to switch on with a clap? (a) a sound sensor (b) a rain sensor (c) a temperature sensor (d) a soil moisture sensor
25. 25.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
26. 26.🔍 Which sensor would you use to stop a robot near walls? (a) a gas sensor (b) a light sensor (c) a temperature sensor (d) a distance sensor
27. 27.🔍 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?
28. 28.⚙️ Which actuator would you use to show the temperature? (a) a motor (b) an LED (c) a display (d) a pump
29. 29.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) an LED (c) a motor (d) a servo motor
30. 30.True or false: to switch on lamps at dusk, use a sound sensor. (a) True (b) False
31. 31.🔍 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
32. 32.🔍 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?
33. 33.🔍 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
34. 34.🔍 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
35. 35.🔍 Which sensor would you use to start a fan when hot? (a) a soil moisture sensor (b) a distance sensor (c) a motion sensor (d) a temperature sensor
36. 36.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
37. 37.🔍 Which sensor would you use to warn of a gas leak? (a) a soil moisture sensor (b) a motion sensor (c) a rain sensor (d) a gas sensor
38. 38.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
39. 39.Which job needs a display? (a) show a status light (b) spin a robot’s wheels (c) show the temperature (d) beep an alarm
40. 40.Which job needs a distance sensor? (a) make a parking alarm (b) switch on with a clap (c) measure classroom noise (d) switch on lamps at dusk

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