Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 227 · 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 open blinds at sunrise? (a) a sound sensor (b) a distance sensor (c) a motion sensor (d) a light sensor
2. 2.⚙️ Which actuator would you use to beep an alarm? (a) a servo motor (b) a buzzer (c) a display (d) an LED
3. 3.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
4. 4.🔍 Which sensor would you use to start a fan when hot? (a) a motion sensor (b) a temperature sensor (c) a gas sensor (d) a light sensor
5. 5.🔍 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
6. 6.Which job needs a buzzer? (a) beep an alarm (b) open a gate to 90° (c) show the temperature (d) show a status light
7. 7.⚙️ What is an actuator? (a) a sensor (b) a battery (c) a program (d) an output that acts
8. 8.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
9. 9.Which job needs a light sensor? (a) stop a robot near walls (b) make a parking alarm (c) start a fan when hot (d) open blinds at sunrise
10. 10.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
11. 11.True or false: to spot someone walking in, use a soil moisture sensor. (a) True (b) False
12. 12.🔍 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
13. 13.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) an input (c) a power source (d) a fuse
14. 14.Which job needs a pump? (a) turn to an exact angle (b) beep an alarm (c) move water to plants (d) open a gate to 90°
15. 15.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
16. 16.⚙️ Which actuator would you use to show the temperature? (a) a buzzer (b) a display (c) a motor (d) a servo motor
17. 17.Which job needs a gas sensor? (a) warn of a gas leak (b) water a dry plant (c) start a fan when hot (d) switch on lamps at dusk
18. 18.🔍 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)?
19. 19.True or false: to close a window in rain, use a temperature sensor. (a) False (b) True
20. 20.🔍 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?
21. 21.🔍 Which sensor would you use to keep an incubator warm? (a) a sound sensor (b) a gas sensor (c) a temperature sensor (d) a soil moisture sensor
22. 22.⚙️ Which actuator would you use to turn to an exact angle? (a) an LED (b) a pump (c) a display (d) a servo motor
23. 23.Which job needs a sound sensor? (a) switch on lamps at dusk (b) measure classroom noise (c) start a fan when hot (d) close a window in rain
24. 24.Which job needs a display? (a) turn to an exact angle (b) open a gate to 90° (c) show the temperature (d) spin a robot’s wheels
25. 25.🔍 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 motion sensor
26. 26.True or false: to make a parking alarm, use a gas sensor. (a) False (b) True
27. 27.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) a display (c) a buzzer (d) a servo motor
28. 28.🔍 Which sensor would you use to stop a robot near walls? (a) a temperature sensor (b) a soil moisture sensor (c) a motion sensor (d) a distance sensor
29. 29.Which job needs a distance sensor? (a) switch on lamps at dusk (b) switch on with a clap (c) make a parking alarm (d) spot someone walking in
30. 30.🔍 An object is 289 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
31. 31.🔍 Which sensor would you use to close a window in rain? (a) a motion sensor (b) a temperature sensor (c) a rain sensor (d) a distance sensor
32. 32.🔍 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)?
33. 33.Which job needs a motor? (a) turn to an exact angle (b) show the temperature (c) spin a robot’s wheels (d) open a gate to 90°
34. 34.Which job needs a distance sensor? (a) measure classroom noise (b) switch on lamps at dusk (c) open blinds at sunrise (d) stop a robot near walls
35. 35.True or false: to close a window in rain, use a gas sensor. (a) False (b) True
36. 36.🔍 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?
37. 37.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
38. 38.Which job needs a soil moisture sensor? (a) measure classroom noise (b) switch on with a clap (c) spot someone walking in (d) water a dry plant
39. 39.True or false: to stop a robot near walls, use a rain sensor. (a) False (b) True
40. 40.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a light sensor (c) a temperature sensor (d) a sound sensor

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