Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 117 · 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 keep an incubator warm? (a) a gas sensor (b) a distance sensor (c) a temperature sensor (d) a light sensor
2. 2.True or false: to keep an incubator warm, use a sound sensor. (a) False (b) True
3. 3.⚙️ Which actuator would you use to show the temperature? (a) a motor (b) a pump (c) a display (d) a servo motor
4. 4.Which job needs a light sensor? (a) start a fan when hot (b) make a parking alarm (c) measure classroom noise (d) open blinds at sunrise
5. 5.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) a fuse (c) an input (d) an output
6. 6.⚙️ What is an actuator? (a) a sensor (b) an output that acts (c) a battery (d) a program
7. 7.Which job needs a distance sensor? (a) warn of a gas leak (b) switch on lamps at dusk (c) keep an incubator warm (d) make a parking alarm
8. 8.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
9. 9.🔍 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?
10. 10.Which job needs a soil moisture sensor? (a) start a fan when hot (b) water a dry plant (c) measure classroom noise (d) close a window in rain
11. 11.🔍 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
12. 12.Which job needs a pump? (a) beep an alarm (b) open a gate to 90° (c) turn to an exact angle (d) move water to plants
13. 13.🔍 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
14. 14.Which job needs a motion sensor? (a) close a window in rain (b) make a parking alarm (c) spot someone walking in (d) stop a robot near walls
15. 15.🔍 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
16. 16.🔍 Which sensor would you use to switch on with a clap? (a) a distance sensor (b) a sound sensor (c) a soil moisture sensor (d) a motion sensor
17. 17.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) an LED (c) a motor (d) a servo motor
18. 18.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
19. 19.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
20. 20.Which job needs a display? (a) show the temperature (b) beep an alarm (c) spin a robot’s wheels (d) open a gate to 90°
21. 21.Which job needs a gas sensor? (a) measure classroom noise (b) keep an incubator warm (c) water a dry plant (d) warn of a gas leak
22. 22.⚙️ Which actuator would you use to move water to plants? (a) an LED (b) a motor (c) a buzzer (d) a pump
23. 23.True or false: to spot someone walking in, use a soil moisture sensor. (a) True (b) False
24. 24.🔍 Which sensor would you use to make a parking alarm? (a) a light sensor (b) a temperature sensor (c) a distance sensor (d) a soil moisture sensor
25. 25.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) a pump (c) a motor (d) a servo motor
26. 26.True or false: to water a dry plant, use a gas sensor. (a) False (b) True
27. 27.True or false: to start a fan when hot, use a gas sensor. (a) True (b) False
28. 28.🔍 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
29. 29.Which job needs a sound sensor? (a) switch on with a clap (b) spot someone walking in (c) water a dry plant (d) warn of a gas leak
30. 30.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a pump (c) a buzzer (d) a servo motor
31. 31.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
32. 32.🔍 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
33. 33.🔍 Which sensor would you use to switch on lamps at dusk? (a) a sound sensor (b) a rain sensor (c) a soil moisture sensor (d) a light sensor
34. 34.🔍 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?
35. 35.🔍 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)?
36. 36.🔍 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
37. 37.True or false: to close a window in rain, use a light sensor. (a) False (b) True
38. 38.🔍 Which sensor would you use to measure classroom noise? (a) a sound sensor (b) a light sensor (c) a soil moisture sensor (d) a temperature sensor
39. 39.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a motion sensor (c) a sound sensor (d) a temperature sensor
40. 40.True or false: to warn of a gas leak, use a motion sensor. (a) True (b) False

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