Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 120 · 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 pump? (a) move water to plants (b) show a status light (c) show the temperature (d) open a gate to 90°
2. 2.🔍 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
3. 3.Which job needs a motion sensor? (a) start a fan when hot (b) open blinds at sunrise (c) make a parking alarm (d) spot someone walking in
4. 4.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an input (c) an output (d) a power source
5. 5.⚙️ What is an actuator? (a) an output that acts (b) a program (c) a battery (d) a sensor
6. 6.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a motion sensor (c) a gas sensor (d) a soil moisture sensor
7. 7.Which job needs a sound sensor? (a) open blinds at sunrise (b) stop a robot near walls (c) switch on with a clap (d) start a fan when hot
8. 8.🔍 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
9. 9.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a gas sensor (c) a motion sensor (d) a soil moisture sensor
10. 10.True or false: to stop a robot near walls, use a motion sensor. (a) True (b) False
11. 11.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) a servo motor (c) a motor (d) a pump
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.⚙️ Which actuator would you use to open a gate to 90°? (a) a motor (b) an LED (c) a display (d) a servo motor
14. 14.Which job needs a buzzer? (a) show a status light (b) move water to plants (c) show the temperature (d) beep an alarm
15. 15.Which job needs a motor? (a) show the temperature (b) show a status light (c) spin a robot’s wheels (d) turn to an exact angle
16. 16.Which job needs a temperature sensor? (a) keep an incubator warm (b) switch on with a clap (c) close a window in rain (d) switch on lamps at dusk
17. 17.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a motion sensor (c) a light sensor (d) a gas sensor
18. 18.🔍 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?
19. 19.True or false: to water a dry plant, use a light sensor. (a) True (b) False
20. 20.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
21. 21.🔍 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
22. 22.True or false: to close a window in rain, use a light sensor. (a) False (b) True
23. 23.🔍 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?
24. 24.🔍 Which sensor would you use to open blinds at sunrise? (a) a distance sensor (b) a sound sensor (c) a temperature sensor (d) a light sensor
25. 25.⚙️ Which actuator would you use to show the temperature? (a) a buzzer (b) a servo motor (c) an LED (d) a display
26. 26.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a rain sensor (c) a distance sensor (d) a gas sensor
27. 27.🔍 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?
28. 28.Which job needs a gas sensor? (a) switch on lamps at dusk (b) close a window in rain (c) keep an incubator warm (d) warn of a gas leak
29. 29.🔍 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?
30. 30.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
31. 31.⚙️ Which actuator would you use to beep an alarm? (a) a servo motor (b) a display (c) a motor (d) a buzzer
32. 32.Which job needs a soil moisture sensor? (a) water a dry plant (b) measure classroom noise (c) make a parking alarm (d) close a window in rain
33. 33.Which job needs a servo motor? (a) move water to plants (b) turn to an exact angle (c) show a status light (d) beep an alarm
34. 34.⚙️ Which actuator would you use to move water to plants? (a) an LED (b) a servo motor (c) a pump (d) a buzzer
35. 35.Which job needs an LED? (a) turn to an exact angle (b) open a gate to 90° (c) show a status light (d) move water to plants
36. 36.Which job needs a temperature sensor? (a) switch on with a clap (b) start a fan when hot (c) warn of a gas leak (d) switch on lamps at dusk
37. 37.🔍 Which sensor would you use to make a parking alarm? (a) a light sensor (b) a distance sensor (c) a sound sensor (d) a soil moisture sensor
38. 38.Which job needs a servo motor? (a) open a gate to 90° (b) move water to plants (c) spin a robot’s wheels (d) beep an alarm
39. 39.Which job needs a display? (a) move water to plants (b) show the temperature (c) beep an alarm (d) spin a robot’s wheels
40. 40.True or false: to make a parking alarm, use a light sensor. (a) False (b) True

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