Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 349 · 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) an input (b) a power source (c) a fuse (d) an output
2. 2.🔍 Which sensor would you use to warn of a gas leak? (a) a rain sensor (b) a sound sensor (c) a soil moisture sensor (d) a gas sensor
3. 3.Which job needs a sound sensor? (a) start a fan when hot (b) switch on lamps at dusk (c) switch on with a clap (d) open blinds at sunrise
4. 4.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
5. 5.🔍 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
6. 6.⚙️ What is an actuator? (a) a battery (b) a program (c) an output that acts (d) a sensor
7. 7.Which job needs a soil moisture sensor? (a) start a fan when hot (b) warn of a gas leak (c) make a parking alarm (d) water a dry plant
8. 8.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) an LED (c) a buzzer (d) a motor
9. 9.Which job needs a pump? (a) show the temperature (b) move water to plants (c) turn to an exact angle (d) spin a robot’s wheels
10. 10.🔍 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?
11. 11.🔍 Which sensor would you use to make a parking alarm? (a) a gas sensor (b) a distance sensor (c) a temperature sensor (d) a light sensor
12. 12.Which job needs a gas sensor? (a) make a parking alarm (b) spot someone walking in (c) switch on with a clap (d) warn of a gas leak
13. 13.Which job needs a display? (a) spin a robot’s wheels (b) turn to an exact angle (c) show the temperature (d) beep an alarm
14. 14.Which job needs a motor? (a) spin a robot’s wheels (b) show a status light (c) turn to an exact angle (d) open a gate to 90°
15. 15.Which job needs a distance sensor? (a) warn of a gas leak (b) stop a robot near walls (c) keep an incubator warm (d) water a dry plant
16. 16.⚙️ Which actuator would you use to move water to plants? (a) a motor (b) a servo motor (c) a pump (d) an LED
17. 17.🔍 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
18. 18.🔍 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)?
19. 19.True or false: to warn of a gas leak, use a motion sensor. (a) False (b) True
20. 20.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
21. 21.True or false: to stop a robot near walls, use a soil moisture sensor. (a) False (b) True
22. 22.Which job needs a light sensor? (a) start a fan when hot (b) spot someone walking in (c) switch on with a clap (d) switch on lamps at dusk
23. 23.🔍 Which sensor would you use to water a dry plant? (a) a soil moisture sensor (b) a gas sensor (c) a temperature sensor (d) a light sensor
24. 24.Which job needs a rain sensor? (a) measure classroom noise (b) switch on with a clap (c) close a window in rain (d) start a fan when hot
25. 25.🔍 Which sensor would you use to open blinds at sunrise? (a) a rain sensor (b) a light sensor (c) a temperature sensor (d) a soil moisture sensor
26. 26.True or false: to warn of a gas leak, use a temperature sensor. (a) True (b) False
27. 27.🔍 Which sensor would you use to switch on lamps at dusk? (a) a distance sensor (b) a motion sensor (c) a sound sensor (d) a light sensor
28. 28.Which job needs a motion sensor? (a) switch on lamps at dusk (b) warn of a gas leak (c) start a fan when hot (d) spot someone walking in
29. 29.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a sound sensor (c) a temperature sensor (d) a gas sensor
30. 30.🔍 Which sensor would you use to measure classroom noise? (a) a temperature sensor (b) a gas sensor (c) a sound sensor (d) a light sensor
31. 31.⚙️ Which actuator would you use to beep an alarm? (a) a display (b) a motor (c) a buzzer (d) a pump
32. 32.🔍 Which sensor would you use to keep an incubator warm? (a) a soil moisture sensor (b) a motion sensor (c) a temperature sensor (d) a rain sensor
33. 33.Which job needs a servo motor? (a) spin a robot’s wheels (b) turn to an exact angle (c) show a status light (d) beep an alarm
34. 34.🔍 A distance sensor sends a sound pulse and hears the echo 4 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 close a window in rain? (a) a sound sensor (b) a rain sensor (c) a motion sensor (d) a distance sensor
36. 36.⚙️ Which actuator would you use to open a gate to 90°? (a) a buzzer (b) a motor (c) a display (d) a servo motor
37. 37.⚙️ Which actuator would you use to show the temperature? (a) a display (b) an LED (c) a pump (d) a servo motor
38. 38.🔍 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?
39. 39.Which job needs an LED? (a) open a gate to 90° (b) show a status light (c) turn to an exact angle (d) beep an alarm
40. 40.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) a display (c) a servo motor (d) a buzzer

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