Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 106 · 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 keep an incubator warm, use a temperature sensor. (a) False (b) True
2. 2.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an output (c) an input (d) a power source
3. 3.Which job needs a buzzer? (a) open a gate to 90° (b) show the temperature (c) turn to an exact angle (d) beep an alarm
4. 4.⚙️ What is an actuator? (a) an output that acts (b) a program (c) a battery (d) a sensor
5. 5.🔍 Which sensor would you use to open blinds at sunrise? (a) a temperature sensor (b) a rain sensor (c) a light sensor (d) a gas sensor
6. 6.🔍 Which sensor would you use to spot someone walking in? (a) a light sensor (b) a temperature sensor (c) a soil moisture sensor (d) a motion sensor
7. 7.Which job needs a soil moisture sensor? (a) water a dry plant (b) measure classroom noise (c) open blinds at sunrise (d) stop a robot near walls
8. 8.🔍 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
9. 9.🔍 Which sensor would you use to stop a robot near walls? (a) a rain sensor (b) a soil moisture sensor (c) a distance sensor (d) a motion sensor
10. 10.🔍 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
11. 11.Which job needs a servo motor? (a) show a status light (b) show the temperature (c) turn to an exact angle (d) spin a robot’s wheels
12. 12.True or false: to make a parking alarm, use a sound sensor. (a) False (b) True
13. 13.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a pump (c) a servo motor (d) a motor
14. 14.⚙️ Which actuator would you use to show a status light? (a) a display (b) a servo motor (c) a motor (d) an LED
15. 15.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a display (c) a servo motor (d) a buzzer
16. 16.⚙️ Which actuator would you use to beep an alarm? (a) a display (b) a motor (c) a buzzer (d) a servo motor
17. 17.🔍 Which sensor would you use to make a parking alarm? (a) a motion sensor (b) a gas sensor (c) a distance sensor (d) a sound sensor
18. 18.🔍 Which sensor would you use to water a dry plant? (a) a light sensor (b) a rain sensor (c) a soil moisture sensor (d) a gas sensor
19. 19.Which job needs a display? (a) move water to plants (b) spin a robot’s wheels (c) show the temperature (d) turn to an exact angle
20. 20.Which job needs a motor? (a) turn to an exact angle (b) open a gate to 90° (c) show a status light (d) spin a robot’s wheels
21. 21.Which job needs a distance sensor? (a) stop a robot near walls (b) switch on lamps at dusk (c) warn of a gas leak (d) switch on with a clap
22. 22.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
23. 23.🔍 Which sensor would you use to start a fan when hot? (a) a distance sensor (b) a temperature sensor (c) a light sensor (d) a soil moisture sensor
24. 24.Which job needs a rain sensor? (a) spot someone walking in (b) close a window in rain (c) measure classroom noise (d) start a fan when hot
25. 25.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
26. 26.True or false: to keep an incubator warm, use a motion sensor. (a) True (b) False
27. 27.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) a servo motor (c) an LED (d) a motor
28. 28.🔍 Which sensor would you use to switch on with a clap? (a) a distance sensor (b) a temperature sensor (c) a sound sensor (d) a light sensor
29. 29.True or false: to switch on with a clap, use a light sensor. (a) False (b) True
30. 30.🔍 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)?
31. 31.🔍 Which sensor would you use to switch on lamps at dusk? (a) a light sensor (b) a rain sensor (c) a distance sensor (d) a motion 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) keep an incubator warm (b) warn of a gas leak (c) measure classroom noise (d) spot someone walking in
34. 34.Which job needs a servo motor? (a) spin a robot’s wheels (b) open a gate to 90° (c) beep an alarm (d) show the temperature
35. 35.Which job needs an LED? (a) turn to an exact angle (b) open a gate to 90° (c) show the temperature (d) show a status light
36. 36.🔍 Which sensor would you use to measure classroom noise? (a) a rain sensor (b) a sound sensor (c) a temperature sensor (d) a distance sensor
37. 37.Which job needs a pump? (a) show a status light (b) move water to plants (c) show the temperature (d) beep an alarm
38. 38.🔍 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
39. 39.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a soil moisture sensor (c) a light sensor (d) a rain sensor
40. 40.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False

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