Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 112 · 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 motor? (a) move water to plants (b) show a status light (c) beep an alarm (d) spin a robot’s wheels
2. 2.Which job needs a servo motor? (a) turn to an exact angle (b) spin a robot’s wheels (c) beep an alarm (d) show a status light
3. 3.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
4. 4.Which job needs a sound sensor? (a) start a fan when hot (b) warn of a gas leak (c) stop a robot near walls (d) measure classroom noise
5. 5.Which job needs a temperature sensor? (a) warn of a gas leak (b) keep an incubator warm (c) switch on lamps at dusk (d) switch on with a clap
6. 6.🔍 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
7. 7.🔍 Which sensor would you use to start a fan when hot? (a) a rain sensor (b) a distance sensor (c) a temperature sensor (d) a gas sensor
8. 8.Which job needs a light sensor? (a) switch on lamps at dusk (b) stop a robot near walls (c) close a window in rain (d) make a parking alarm
9. 9.Which job needs a gas sensor? (a) close a window in rain (b) start a fan when hot (c) warn of a gas leak (d) make a parking alarm
10. 10.🔍 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
11. 11.🔍 Which sensor would you use to switch on lamps at dusk? (a) a light sensor (b) a motion sensor (c) a distance sensor (d) a temperature sensor
12. 12.🔍 Which sensor would you use to water a dry plant? (a) a distance sensor (b) a gas sensor (c) a light sensor (d) a soil moisture sensor
13. 13.Which job needs a light sensor? (a) start a fan when hot (b) close a window in rain (c) open blinds at sunrise (d) warn of a gas leak
14. 14.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) an LED (c) a buzzer (d) a motor
15. 15.True or false: to measure classroom noise, use a distance sensor. (a) True (b) False
16. 16.Which job needs a rain sensor? (a) start a fan when hot (b) close a window in rain (c) stop a robot near walls (d) water a dry plant
17. 17.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a fuse (d) a power source
18. 18.🔍 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 soil moisture sensor
19. 19.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
20. 20.🔍 Which sensor would you use to spot someone walking in? (a) a light sensor (b) a rain sensor (c) a motion sensor (d) a sound sensor
21. 21.⚙️ What is an actuator? (a) a battery (b) a program (c) a sensor (d) an output that acts
22. 22.🔍 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?
23. 23.True or false: to close a window in rain, use a sound sensor. (a) True (b) False
24. 24.🔍 Which sensor would you use to open blinds at sunrise? (a) a distance sensor (b) a gas sensor (c) a light sensor (d) a sound sensor
25. 25.🔍 Which sensor would you use to keep an incubator warm? (a) a motion sensor (b) a distance sensor (c) a temperature sensor (d) a soil moisture sensor
26. 26.True or false: to switch on lamps at dusk, use a soil moisture sensor. (a) True (b) False
27. 27.🔍 Which sensor would you use to close a window in rain? (a) a motion sensor (b) a sound sensor (c) a rain sensor (d) a gas sensor
28. 28.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a motor (c) a pump (d) a buzzer
29. 29.Which job needs a distance sensor? (a) keep an incubator warm (b) close a window in rain (c) stop a robot near walls (d) warn of a gas leak
30. 30.True or false: to make a parking alarm, use a gas sensor. (a) True (b) False
31. 31.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) an LED (c) a pump (d) a motor
32. 32.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a gas sensor (c) a motion sensor (d) a temperature sensor
33. 33.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
34. 34.True or false: to water a dry plant, use a sound sensor. (a) False (b) True
35. 35.True or false: to measure classroom noise, use a light sensor. (a) False (b) True
36. 36.🔍 Which sensor would you use to measure classroom noise? (a) a distance sensor (b) a soil moisture sensor (c) a motion sensor (d) a sound sensor
37. 37.🔍 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?
38. 38.Which job needs a buzzer? (a) show a status light (b) turn to an exact angle (c) beep an alarm (d) show the temperature
39. 39.Which job needs a motion sensor? (a) spot someone walking in (b) water a dry plant (c) switch on lamps at dusk (d) switch on with a clap
40. 40.Which job needs a sound sensor? (a) switch on with a clap (b) warn of a gas leak (c) open blinds at sunrise (d) water a dry plant

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