Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 220 · 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 switch on with a clap? (a) a gas sensor (b) a distance sensor (c) a sound sensor (d) a soil moisture sensor
2. 2.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) a pump (c) a buzzer (d) an LED
3. 3.Which job needs a pump? (a) spin a robot’s wheels (b) turn to an exact angle (c) move water to plants (d) open a gate to 90°
4. 4.🔍 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)?
5. 5.Which job needs a distance sensor? (a) switch on with a clap (b) warn of a gas leak (c) water a dry plant (d) stop a robot near walls
6. 6.🔍 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?
7. 7.⚙️ Which actuator would you use to show the temperature? (a) a servo motor (b) a pump (c) a display (d) a buzzer
8. 8.Which job needs an LED? (a) open a gate to 90° (b) beep an alarm (c) show a status light (d) spin a robot’s wheels
9. 9.Which job needs a buzzer? (a) move water to plants (b) show the temperature (c) beep an alarm (d) turn to an exact angle
10. 10.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an output (d) an input
11. 11.⚙️ What is an actuator? (a) a battery (b) a sensor (c) a program (d) an output that acts
12. 12.Which job needs a display? (a) beep an alarm (b) show a status light (c) show the temperature (d) turn to an exact angle
13. 13.🔍 Which sensor would you use to keep an incubator warm? (a) a light sensor (b) a rain sensor (c) a soil moisture sensor (d) a temperature sensor
14. 14.🔍 Which sensor would you use to start a fan when hot? (a) a sound sensor (b) a temperature sensor (c) a distance sensor (d) a gas sensor
15. 15.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
16. 16.Which job needs a temperature sensor? (a) measure classroom noise (b) stop a robot near walls (c) open blinds at sunrise (d) keep an incubator warm
17. 17.🔍 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?
18. 18.⚙️ Which actuator would you use to spin a robot’s wheels? (a) an LED (b) a pump (c) a servo motor (d) a motor
19. 19.🔍 Which sensor would you use to stop a robot near walls? (a) a motion sensor (b) a sound sensor (c) a distance sensor (d) a light sensor
20. 20.🔍 Which sensor would you use to water a dry plant? (a) a sound sensor (b) a soil moisture sensor (c) a distance sensor (d) a gas sensor
21. 21.Which job needs a light sensor? (a) make a parking alarm (b) open blinds at sunrise (c) start a fan when hot (d) close a window in rain
22. 22.Which job needs a rain sensor? (a) spot someone walking in (b) make a parking alarm (c) close a window in rain (d) measure classroom noise
23. 23.🔍 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
24. 24.🔍 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
25. 25.🔍 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)?
26. 26.🔍 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
27. 27.Which job needs a soil moisture sensor? (a) switch on lamps at dusk (b) water a dry plant (c) spot someone walking in (d) measure classroom noise
28. 28.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a display (c) a pump (d) a servo motor
29. 29.🔍 Which sensor would you use to measure classroom noise? (a) a gas sensor (b) a temperature sensor (c) a sound sensor (d) a distance sensor
30. 30.⚙️ Which actuator would you use to move water to plants? (a) a buzzer (b) a motor (c) a servo motor (d) a pump
31. 31.Which job needs a servo motor? (a) open a gate to 90° (b) move water to plants (c) show a status light (d) spin a robot’s wheels
32. 32.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
33. 33.🔍 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?
34. 34.True or false: to close a window in rain, use a soil moisture sensor. (a) False (b) True
35. 35.Which job needs a sound sensor? (a) spot someone walking in (b) switch on lamps at dusk (c) measure classroom noise (d) close a window in rain
36. 36.🔍 Which sensor would you use to warn of a gas leak? (a) a soil moisture sensor (b) a sound sensor (c) a light sensor (d) a gas sensor
37. 37.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a rain sensor (c) a soil moisture sensor (d) a distance sensor
38. 38.🔍 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)?
39. 39.True or false: to measure classroom noise, use a temperature sensor. (a) True (b) False
40. 40.🔍 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?

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