Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 213 · 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 measure classroom noise? (a) a motion sensor (b) a temperature sensor (c) a sound sensor (d) a light sensor
2. 2.Which job needs a sound sensor? (a) keep an incubator warm (b) water a dry plant (c) make a parking alarm (d) switch on with a clap
3. 3.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a sound sensor (c) a gas sensor (d) a light sensor
4. 4.Which job needs a rain sensor? (a) close a window in rain (b) spot someone walking in (c) open blinds at sunrise (d) stop a robot near walls
5. 5.🔍 Which sensor would you use to keep an incubator warm? (a) a sound sensor (b) a soil moisture sensor (c) a temperature sensor (d) a distance sensor
6. 6.🔍 Which sensor would you use to close a window in rain? (a) a motion sensor (b) a sound sensor (c) a rain sensor (d) a soil moisture sensor
7. 7.🔍 Which sensor would you use to water a dry plant? (a) a motion sensor (b) a distance sensor (c) a sound sensor (d) a soil moisture sensor
8. 8.Which job needs an LED? (a) turn to an exact angle (b) show a status light (c) spin a robot’s wheels (d) open a gate to 90°
9. 9.True or false: to close a window in rain, use a rain sensor. (a) True (b) False
10. 10.Which job needs a display? (a) open a gate to 90° (b) beep an alarm (c) turn to an exact angle (d) show the temperature
11. 11.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) a motor (c) a servo motor (d) an LED
12. 12.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a power source (d) a fuse
13. 13.True or false: to keep an incubator warm, use a sound sensor. (a) False (b) True
14. 14.🔍 Which sensor would you use to start a fan when hot? (a) a light sensor (b) a motion sensor (c) a rain sensor (d) a temperature sensor
15. 15.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
16. 16.🔍 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)?
17. 17.🔍 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?
18. 18.🔍 Which sensor would you use to warn of a gas leak? (a) a motion sensor (b) a soil moisture sensor (c) a sound sensor (d) a gas sensor
19. 19.🔍 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?
20. 20.Which job needs a temperature sensor? (a) make a parking alarm (b) measure classroom noise (c) start a fan when hot (d) stop a robot near walls
21. 21.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a display (c) a motor (d) a buzzer
22. 22.True or false: to water a dry plant, use a motion sensor. (a) True (b) False
23. 23.⚙️ What is an actuator? (a) a program (b) an output that acts (c) a sensor (d) a battery
24. 24.Which job needs a motion sensor? (a) close a window in rain (b) spot someone walking in (c) water a dry plant (d) stop a robot near walls
25. 25.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
26. 26.🔍 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)?
27. 27.True or false: to close a window in rain, use a gas sensor. (a) True (b) False
28. 28.Which job needs a light sensor? (a) stop a robot near walls (b) close a window in rain (c) switch on lamps at dusk (d) water a dry plant
29. 29.🔍 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
30. 30.⚙️ Which actuator would you use to show the temperature? (a) a servo motor (b) a display (c) an LED (d) a motor
31. 31.🔍 Which sensor would you use to switch on with a clap? (a) a temperature sensor (b) a light sensor (c) a soil moisture sensor (d) a sound sensor
32. 32.Which job needs a servo motor? (a) move water to plants (b) show a status light (c) spin a robot’s wheels (d) turn to an exact angle
33. 33.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a buzzer (c) a pump (d) an LED
34. 34.True or false: to make a parking alarm, use a sound sensor. (a) False (b) True
35. 35.🔍 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
36. 36.🔍 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
37. 37.🔍 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)?
38. 38.⚙️ Which actuator would you use to turn to an exact angle? (a) an LED (b) a motor (c) a servo motor (d) a pump
39. 39.🔍 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.Which job needs a pump? (a) open a gate to 90° (b) show the temperature (c) move water to plants (d) beep an alarm

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