Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 35 · 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 rain sensor? (a) switch on with a clap (b) open blinds at sunrise (c) keep an incubator warm (d) close a window in rain
2. 2.Which job needs a motor? (a) spin a robot’s wheels (b) turn to an exact angle (c) open a gate to 90° (d) show a status light
3. 3.🔍 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)?
4. 4.⚙️ What is an actuator? (a) an output that acts (b) a program (c) a battery (d) a sensor
5. 5.⚙️ Which actuator would you use to move water to plants? (a) a display (b) a motor (c) an LED (d) a pump
6. 6.Which job needs a light sensor? (a) stop a robot near walls (b) open blinds at sunrise (c) start a fan when hot (d) switch on with a clap
7. 7.Which job needs a distance sensor? (a) start a fan when hot (b) close a window in rain (c) switch on lamps at dusk (d) make a parking alarm
8. 8.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
9. 9.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a distance sensor (c) a sound sensor (d) a temperature sensor
10. 10.True or false: to measure classroom noise, use a motion sensor. (a) False (b) True
11. 11.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an output (c) a fuse (d) an input
12. 12.⚙️ Which actuator would you use to beep an alarm? (a) a servo motor (b) a motor (c) an LED (d) a buzzer
13. 13.🔍 Which sensor would you use to start a fan when hot? (a) a rain sensor (b) a soil moisture sensor (c) a sound sensor (d) a temperature sensor
14. 14.🔍 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)?
15. 15.True or false: to measure classroom noise, use a temperature sensor. (a) False (b) True
16. 16.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a motor (c) a servo motor (d) a display
17. 17.🔍 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?
18. 18.Which job needs a sound sensor? (a) water a dry plant (b) spot someone walking in (c) switch on with a clap (d) open blinds at sunrise
19. 19.True or false: to start a fan when hot, use a rain sensor. (a) False (b) True
20. 20.🔍 Which sensor would you use to keep an incubator warm? (a) a distance sensor (b) a soil moisture sensor (c) a temperature sensor (d) a motion sensor
21. 21.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a soil moisture sensor (c) a motion sensor (d) a gas sensor
22. 22.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a pump (c) a servo motor (d) a motor
23. 23.🔍 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
24. 24.True or false: to water a dry plant, use a light sensor. (a) False (b) True
25. 25.True or false: to stop a robot near walls, use a sound sensor. (a) True (b) False
26. 26.Which job needs a pump? (a) show the temperature (b) turn to an exact angle (c) move water to plants (d) beep an alarm
27. 27.Which job needs an LED? (a) show a status light (b) spin a robot’s wheels (c) move water to plants (d) turn to an exact angle
28. 28.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) a motor (c) an LED (d) a buzzer
29. 29.🔍 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
30. 30.🔍 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?
31. 31.Which job needs a distance sensor? (a) spot someone walking in (b) stop a robot near walls (c) water a dry plant (d) start a fan when hot
32. 32.Which job needs a servo motor? (a) move water to plants (b) beep an alarm (c) spin a robot’s wheels (d) turn to an exact angle
33. 33.🔍 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)?
34. 34.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) a servo motor (c) a buzzer (d) a motor
35. 35.🔍 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)?
36. 36.🔍 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
37. 37.🔍 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)?
38. 38.🔍 Which sensor would you use to close a window in rain? (a) a gas sensor (b) a rain sensor (c) a sound sensor (d) a motion sensor
39. 39.🔍 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)?
40. 40.True or false: to keep an incubator warm, use a sound sensor. (a) True (b) False

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