Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 180 · 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.True or false: to measure classroom noise, use a rain sensor. (a) True (b) False
2. 2.Which job needs a servo motor? (a) show the temperature (b) turn to an exact angle (c) show a status light (d) beep an alarm
3. 3.True or false: to close a window in rain, use a sound sensor. (a) False (b) True
4. 4.True or false: to start a fan when hot, use a motion sensor. (a) True (b) False
5. 5.🔍 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 light sensor
6. 6.True or false: to spot someone walking in, use a temperature sensor. (a) True (b) False
7. 7.🔍 Which sensor would you use to spot someone walking in? (a) a light sensor (b) a distance sensor (c) a temperature sensor (d) a motion sensor
8. 8.True or false: to water a dry plant, use a temperature sensor. (a) False (b) True
9. 9.⚙️ What is an actuator? (a) a sensor (b) an output that acts (c) a battery (d) a program
10. 10.Which job needs a temperature sensor? (a) water a dry plant (b) make a parking alarm (c) start a fan when hot (d) measure classroom noise
11. 11.🔍 Which sensor would you use to switch on with a clap? (a) a temperature sensor (b) a light sensor (c) a gas sensor (d) a sound sensor
12. 12.⚙️ Which actuator would you use to spin a robot’s wheels? (a) an LED (b) a servo motor (c) a pump (d) a motor
13. 13.Which job needs a motion sensor? (a) start a fan when hot (b) spot someone walking in (c) keep an incubator warm (d) make a parking alarm
14. 14.Which job needs a soil moisture sensor? (a) warn of a gas leak (b) water a dry plant (c) start a fan when hot (d) spot someone walking in
15. 15.🔍 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?
16. 16.Which job needs a pump? (a) turn to an exact angle (b) open a gate to 90° (c) show the temperature (d) move water to plants
17. 17.Which job needs a light sensor? (a) switch on lamps at dusk (b) close a window in rain (c) measure classroom noise (d) switch on with a clap
18. 18.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
19. 19.🔍 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)?
20. 20.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an output (d) an input
21. 21.True or false: to switch on lamps at dusk, use a sound sensor. (a) True (b) False
22. 22.Which job needs a display? (a) beep an alarm (b) show the temperature (c) turn to an exact angle (d) spin a robot’s wheels
23. 23.Which job needs a rain sensor? (a) water a dry plant (b) measure classroom noise (c) close a window in rain (d) make a parking alarm
24. 24.True or false: to warn of a gas leak, use a temperature sensor. (a) False (b) True
25. 25.🔍 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?
26. 26.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) an LED (c) a servo motor (d) a motor
27. 27.Which job needs a light sensor? (a) make a parking alarm (b) measure classroom noise (c) warn of a gas leak (d) open blinds at sunrise
28. 28.🔍 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?
29. 29.🔍 Which sensor would you use to warn of a gas leak? (a) a sound sensor (b) a soil moisture sensor (c) a gas sensor (d) a rain sensor
30. 30.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
31. 31.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a servo motor (c) a pump (d) a buzzer
32. 32.🔍 Which sensor would you use to switch on lamps at dusk? (a) a rain sensor (b) a gas sensor (c) a soil moisture sensor (d) a light sensor
33. 33.Which job needs an LED? (a) show a status light (b) show the temperature (c) move water to plants (d) beep an alarm
34. 34.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a display (c) a motor (d) a servo motor
35. 35.🔍 Which sensor would you use to make a parking alarm? (a) a gas sensor (b) a distance sensor (c) a soil moisture sensor (d) a light sensor
36. 36.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
37. 37.Which job needs a distance sensor? (a) keep an incubator warm (b) switch on with a clap (c) switch on lamps at dusk (d) stop a robot near walls
38. 38.Which job needs a sound sensor? (a) switch on with a clap (b) warn of a gas leak (c) open blinds at sunrise (d) spot someone walking in
39. 39.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a pump (c) a motor (d) a buzzer
40. 40.🔍 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?

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