Electronics Worksheet: Sensors and Actuators

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

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