Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 92 · 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 spot someone walking in, use a motion sensor. (a) False (b) True
2. 2.🔍 Which sensor would you use to warn of a gas leak? (a) a rain sensor (b) a gas sensor (c) a sound sensor (d) a soil moisture sensor
3. 3.⚙️ Which actuator would you use to show the temperature? (a) a buzzer (b) a servo motor (c) a display (d) a motor
4. 4.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) a pump (c) a motor (d) an LED
5. 5.Which job needs a buzzer? (a) show a status light (b) show the temperature (c) open a gate to 90° (d) beep an alarm
6. 6.🔍 Which sensor would you use to start a fan when hot? (a) a gas sensor (b) a sound sensor (c) a light sensor (d) a temperature sensor
7. 7.Which job needs an LED? (a) open a gate to 90° (b) show a status light (c) spin a robot’s wheels (d) turn to an exact angle
8. 8.Which job needs a gas sensor? (a) keep an incubator warm (b) warn of a gas leak (c) switch on with a clap (d) switch on lamps at dusk
9. 9.Which job needs a temperature sensor? (a) open blinds at sunrise (b) make a parking alarm (c) close a window in rain (d) start a fan when hot
10. 10.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
11. 11.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a motor (c) an LED (d) a display
12. 12.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
13. 13.Which job needs a display? (a) show the temperature (b) spin a robot’s wheels (c) move water to plants (d) show a status light
14. 14.🔍 Which sensor would you use to close a window in rain? (a) a distance sensor (b) a light sensor (c) a rain sensor (d) a motion sensor
15. 15.Which job needs a light sensor? (a) start a fan when hot (b) stop a robot near walls (c) water a dry plant (d) switch on lamps at dusk
16. 16.⚙️ Which actuator would you use to open a gate to 90°? (a) a buzzer (b) a pump (c) a servo motor (d) a motor
17. 17.Which job needs a motion sensor? (a) make a parking alarm (b) water a dry plant (c) stop a robot near walls (d) spot someone walking in
18. 18.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an input (c) a power source (d) an output
19. 19.🔍 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
20. 20.⚙️ What is an actuator? (a) a sensor (b) a battery (c) a program (d) an output that acts
21. 21.⚙️ Which actuator would you use to show a status light? (a) a pump (b) a buzzer (c) a display (d) an LED
22. 22.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a soil moisture sensor (c) a motion sensor (d) a distance sensor
23. 23.🔍 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)?
24. 24.Which job needs a servo motor? (a) spin a robot’s wheels (b) show the temperature (c) open a gate to 90° (d) show a status light
25. 25.True or false: to switch on with a clap, use a distance sensor. (a) True (b) False
26. 26.🔍 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?
27. 27.🔍 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)?
28. 28.🔍 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)?
29. 29.🔍 Which sensor would you use to stop a robot near walls? (a) a sound sensor (b) a distance sensor (c) a light sensor (d) a rain sensor
30. 30.⚙️ Which actuator would you use to turn to an exact angle? (a) a display (b) a servo motor (c) a pump (d) a buzzer
31. 31.🔍 Which sensor would you use to measure classroom noise? (a) a motion sensor (b) a distance sensor (c) a sound sensor (d) a soil moisture sensor
32. 32.True or false: to measure classroom noise, use a light sensor. (a) False (b) True
33. 33.True or false: to keep an incubator warm, use a rain sensor. (a) False (b) True
34. 34.Which job needs a pump? (a) turn to an exact angle (b) open a gate to 90° (c) beep an alarm (d) move water to plants
35. 35.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a rain sensor (c) a motion sensor (d) a sound sensor
36. 36.Which job needs a temperature sensor? (a) keep an incubator warm (b) measure classroom noise (c) close a window in rain (d) water a dry plant
37. 37.🔍 Which sensor would you use to water a dry plant? (a) a sound sensor (b) a rain sensor (c) a distance sensor (d) a soil moisture sensor
38. 38.🔍 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?
39. 39.🔍 Which sensor would you use to spot someone walking in? (a) a distance sensor (b) a motion sensor (c) a temperature sensor (d) a soil moisture sensor
40. 40.🔍 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 gas sensor

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