Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 252 · 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.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a fuse (c) a power source (d) an input
2. 2.⚙️ Which actuator would you use to show the temperature? (a) a servo motor (b) a display (c) a motor (d) an LED
3. 3.🔍 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
4. 4.True or false: to open blinds at sunrise, use a gas sensor. (a) False (b) True
5. 5.Which job needs a temperature sensor? (a) start a fan when hot (b) switch on lamps at dusk (c) spot someone walking in (d) stop a robot near walls
6. 6.Which job needs a temperature sensor? (a) open blinds at sunrise (b) keep an incubator warm (c) stop a robot near walls (d) close a window in rain
7. 7.Which job needs a rain sensor? (a) close a window in rain (b) measure classroom noise (c) open blinds at sunrise (d) water a dry plant
8. 8.Which job needs an LED? (a) spin a robot’s wheels (b) show a status light (c) show the temperature (d) beep an alarm
9. 9.⚙️ What is an actuator? (a) a program (b) an output that acts (c) a sensor (d) a battery
10. 10.🔍 Which sensor would you use to stop a robot near walls? (a) a motion sensor (b) a distance sensor (c) a temperature sensor (d) a light sensor
11. 11.🔍 Which sensor would you use to start a fan when hot? (a) a sound sensor (b) a distance sensor (c) a temperature sensor (d) a gas sensor
12. 12.Which job needs a light sensor? (a) start a fan when hot (b) switch on lamps at dusk (c) make a parking alarm (d) warn of a gas leak
13. 13.Which job needs a light sensor? (a) open blinds at sunrise (b) stop a robot near walls (c) keep an incubator warm (d) warn of a gas leak
14. 14.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) a buzzer (c) a motor (d) a servo motor
15. 15.Which job needs a soil moisture sensor? (a) switch on lamps at dusk (b) spot someone walking in (c) measure classroom noise (d) water a dry plant
16. 16.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
17. 17.🔍 Which sensor would you use to keep an incubator warm? (a) a gas sensor (b) a light sensor (c) a sound sensor (d) a temperature sensor
18. 18.🔍 Which sensor would you use to measure classroom noise? (a) a rain sensor (b) a sound sensor (c) a light sensor (d) a gas sensor
19. 19.Which job needs a servo motor? (a) turn to an exact angle (b) spin a robot’s wheels (c) move water to plants (d) show a status light
20. 20.True or false: to start a fan when hot, use a rain sensor. (a) True (b) False
21. 21.⚙️ Which actuator would you use to open a gate to 90°? (a) a display (b) a servo motor (c) an LED (d) a buzzer
22. 22.🔍 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?
23. 23.Which job needs a motion sensor? (a) switch on with a clap (b) close a window in rain (c) make a parking alarm (d) spot someone walking in
24. 24.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a motion sensor (c) a soil moisture sensor (d) a light sensor
25. 25.🔍 Which sensor would you use to switch on with a clap? (a) a temperature sensor (b) a rain sensor (c) a sound sensor (d) a distance sensor
26. 26.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a gas sensor (c) a rain sensor (d) a light sensor
27. 27.🔍 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?
28. 28.Which job needs a pump? (a) move water to plants (b) show a status light (c) beep an alarm (d) open a gate to 90°
29. 29.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
30. 30.🔍 Which sensor would you use to close a window in rain? (a) a gas sensor (b) a soil moisture sensor (c) a sound sensor (d) a rain sensor
31. 31.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a servo motor (c) a pump (d) an LED
32. 32.🔍 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)?
33. 33.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
34. 34.Which job needs a distance sensor? (a) stop a robot near walls (b) measure classroom noise (c) spot someone walking in (d) switch on with a clap
35. 35.Which job needs a servo motor? (a) spin a robot’s wheels (b) turn to an exact angle (c) show a status light (d) move water to plants
36. 36.True or false: to spot someone walking in, use a soil moisture sensor. (a) True (b) False
37. 37.Which job needs a display? (a) turn to an exact angle (b) show a status light (c) beep an alarm (d) show the temperature
38. 38.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
39. 39.🔍 Which sensor would you use to water a dry plant? (a) a soil moisture sensor (b) a temperature sensor (c) a distance sensor (d) a rain sensor
40. 40.True or false: to start a fan when hot, use a soil moisture sensor. (a) True (b) False

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