Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 9 · 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.⚙️ What is an actuator? (a) an output that acts (b) a program (c) a sensor (d) a battery
2. 2.🔍 Which sensor would you use to open blinds at sunrise? (a) a rain sensor (b) a temperature sensor (c) a light sensor (d) a soil moisture sensor
3. 3.Which job needs a display? (a) move water to plants (b) show the temperature (c) beep an alarm (d) turn to an exact angle
4. 4.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a temperature sensor (c) a rain sensor (d) a light sensor
5. 5.Which job needs an LED? (a) open a gate to 90° (b) beep an alarm (c) show the temperature (d) show a status light
6. 6.🔍 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
7. 7.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a fuse (c) an output (d) a power source
8. 8.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
9. 9.🔍 Which sensor would you use to keep an incubator warm? (a) a soil moisture sensor (b) a temperature sensor (c) a distance sensor (d) a rain sensor
10. 10.True or false: to start a fan when hot, use a gas sensor. (a) True (b) False
11. 11.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
12. 12.🔍 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)?
13. 13.True or false: to open blinds at sunrise, use a gas sensor. (a) True (b) False
14. 14.🔍 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 motion sensor
15. 15.🔍 Which sensor would you use to warn of a gas leak? (a) a gas sensor (b) a distance sensor (c) a light sensor (d) a temperature sensor
16. 16.Which job needs a sound sensor? (a) switch on with a clap (b) stop a robot near walls (c) switch on lamps at dusk (d) make a parking alarm
17. 17.Which job needs a motor? (a) spin a robot’s wheels (b) show the temperature (c) show a status light (d) beep an alarm
18. 18.⚙️ Which actuator would you use to show a status light? (a) a motor (b) a servo motor (c) an LED (d) a pump
19. 19.🔍 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
20. 20.🔍 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
21. 21.Which job needs a temperature sensor? (a) close a window in rain (b) open blinds at sunrise (c) switch on lamps at dusk (d) start a fan when hot
22. 22.🔍 Which sensor would you use to stop a robot near walls? (a) a motion sensor (b) a light sensor (c) a distance sensor (d) a soil moisture sensor
23. 23.🔍 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
24. 24.Which job needs a temperature sensor? (a) keep an incubator warm (b) warn of a gas leak (c) open blinds at sunrise (d) switch on lamps at dusk
25. 25.True or false: to switch on with a clap, use a light sensor. (a) True (b) False
26. 26.🔍 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
27. 27.🔍 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.🔍 Which sensor would you use to water a dry plant? (a) a temperature sensor (b) a soil moisture sensor (c) a rain sensor (d) a sound sensor
29. 29.🔍 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?
30. 30.⚙️ Which actuator would you use to open a gate to 90°? (a) a motor (b) a display (c) an LED (d) a servo motor
31. 31.🔍 Which sensor would you use to spot someone walking in? (a) a distance sensor (b) a rain sensor (c) a gas sensor (d) a motion sensor
32. 32.⚙️ Which actuator would you use to beep an alarm? (a) a pump (b) an LED (c) a display (d) a buzzer
33. 33.Which job needs a soil moisture sensor? (a) make a parking alarm (b) switch on with a clap (c) water a dry plant (d) open blinds at sunrise
34. 34.True or false: to close a window in rain, use a temperature sensor. (a) True (b) False
35. 35.Which job needs a rain sensor? (a) keep an incubator warm (b) make a parking alarm (c) start a fan when hot (d) close a window in rain
36. 36.🔍 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
37. 37.True or false: to warn of a gas leak, use a distance sensor. (a) True (b) False
38. 38.🔍 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?
39. 39.Which job needs a light sensor? (a) spot someone walking in (b) open blinds at sunrise (c) stop a robot near walls (d) keep an incubator warm
40. 40.🔍 Which sensor would you use to close a window in rain? (a) a distance sensor (b) a temperature sensor (c) a rain sensor (d) a soil moisture sensor

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