Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 62 · 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 spot someone walking in? (a) a distance sensor (b) a temperature sensor (c) a light sensor (d) a motion sensor
2. 2.Which job needs a display? (a) show the temperature (b) show a status light (c) spin a robot’s wheels (d) open a gate to 90°
3. 3.🔍 Which sensor would you use to keep an incubator warm? (a) a motion sensor (b) a temperature sensor (c) a gas sensor (d) a sound sensor
4. 4.Which job needs an LED? (a) beep an alarm (b) turn to an exact angle (c) show a status light (d) show the temperature
5. 5.Which job needs a light sensor? (a) switch on with a clap (b) warn of a gas leak (c) open blinds at sunrise (d) start a fan when hot
6. 6.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) a motor (c) a buzzer (d) a pump
7. 7.⚙️ Which actuator would you use to show the temperature? (a) a display (b) an LED (c) a buzzer (d) a servo motor
8. 8.True or false: to measure classroom noise, use a gas sensor. (a) True (b) False
9. 9.⚙️ What is an actuator? (a) a program (b) a sensor (c) a battery (d) an output that acts
10. 10.⚙️ Which actuator would you use to open a gate to 90°? (a) a display (b) a pump (c) a buzzer (d) a servo motor
11. 11.True or false: to warn of a gas leak, use a light sensor. (a) False (b) True
12. 12.Which job needs a motor? (a) show the temperature (b) open a gate to 90° (c) spin a robot’s wheels (d) turn to an exact angle
13. 13.⚙️ Which actuator would you use to move water to plants? (a) a motor (b) a buzzer (c) a servo motor (d) a pump
14. 14.🔍 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)?
15. 15.Which job needs a distance sensor? (a) warn of a gas leak (b) spot someone walking in (c) stop a robot near walls (d) water a dry plant
16. 16.Which job needs a buzzer? (a) spin a robot’s wheels (b) beep an alarm (c) open a gate to 90° (d) show the temperature
17. 17.🔍 Which sensor would you use to measure classroom noise? (a) a sound sensor (b) a motion sensor (c) a temperature sensor (d) a distance sensor
18. 18.Which job needs a motion sensor? (a) warn of a gas leak (b) spot someone walking in (c) stop a robot near walls (d) switch on lamps at dusk
19. 19.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
20. 20.Which job needs a gas sensor? (a) spot someone walking in (b) keep an incubator warm (c) warn of a gas leak (d) open blinds at sunrise
21. 21.True or false: to keep an incubator warm, use a light sensor. (a) False (b) True
22. 22.True or false: to measure classroom noise, use a motion sensor. (a) False (b) True
23. 23.Which job needs a temperature sensor? (a) spot someone walking in (b) start a fan when hot (c) make a parking alarm (d) close a window in rain
24. 24.Which job needs a sound sensor? (a) switch on with a clap (b) water a dry plant (c) open blinds at sunrise (d) spot someone walking in
25. 25.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a fuse (c) a power source (d) an input
26. 26.True or false: to stop a robot near walls, use a motion sensor. (a) False (b) True
27. 27.Which job needs a servo motor? (a) beep an alarm (b) open a gate to 90° (c) move water to plants (d) show a status light
28. 28.🔍 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?
29. 29.🔍 Which sensor would you use to start a fan when hot? (a) a sound sensor (b) a soil moisture sensor (c) a temperature sensor (d) a rain sensor
30. 30.🔍 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?
31. 31.🔍 Which sensor would you use to warn of a gas leak? (a) a rain sensor (b) a light sensor (c) a soil moisture sensor (d) a gas sensor
32. 32.Which job needs a pump? (a) turn to an exact angle (b) spin a robot’s wheels (c) show the temperature (d) move water to plants
33. 33.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a servo motor (c) a display (d) a motor
34. 34.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a soil moisture sensor (c) a motion sensor (d) a sound sensor
35. 35.🔍 Which sensor would you use to close a window in rain? (a) a distance sensor (b) a motion sensor (c) a light sensor (d) a rain sensor
36. 36.🔍 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)?
37. 37.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) an LED (c) a pump (d) a motor
38. 38.True or false: to spot someone walking in, use a sound sensor. (a) True (b) False
39. 39.🔍 Which sensor would you use to switch on with a clap? (a) a soil moisture sensor (b) a sound sensor (c) a distance sensor (d) a temperature sensor
40. 40.True or false: to open blinds at sunrise, use a gas sensor. (a) False (b) True

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