Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 286 · 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 actuator would you use to show the temperature? (a) a servo motor (b) an LED (c) a display (d) a buzzer
2. 2.🔍 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)?
3. 3.Which job needs a motor? (a) show a status light (b) turn to an exact angle (c) move water to plants (d) spin a robot’s wheels
4. 4.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) an LED (c) a pump (d) a display
5. 5.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
6. 6.🔍 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)?
7. 7.Which job needs a soil moisture sensor? (a) keep an incubator warm (b) switch on lamps at dusk (c) water a dry plant (d) make a parking alarm
8. 8.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an input (c) an output (d) a power source
9. 9.⚙️ What is an actuator? (a) a program (b) a battery (c) a sensor (d) an output that acts
10. 10.Which job needs a temperature sensor? (a) keep an incubator warm (b) switch on lamps at dusk (c) spot someone walking in (d) close a window in rain
11. 11.Which job needs a buzzer? (a) open a gate to 90° (b) beep an alarm (c) move water to plants (d) show the temperature
12. 12.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
13. 13.Which job needs a distance sensor? (a) start a fan when hot (b) stop a robot near walls (c) water a dry plant (d) switch on lamps at dusk
14. 14.Which job needs a servo motor? (a) beep an alarm (b) move water to plants (c) spin a robot’s wheels (d) open a gate to 90°
15. 15.🔍 Which sensor would you use to close a window in rain? (a) a light sensor (b) a rain sensor (c) a gas sensor (d) a sound sensor
16. 16.🔍 Which sensor would you use to open blinds at sunrise? (a) a temperature sensor (b) a gas sensor (c) a light sensor (d) a motion sensor
17. 17.Which job needs a distance sensor? (a) measure classroom noise (b) switch on with a clap (c) keep an incubator warm (d) make a parking alarm
18. 18.🔍 Which sensor would you use to warn of a gas leak? (a) a light sensor (b) a sound sensor (c) a temperature sensor (d) a gas sensor
19. 19.True or false: to keep an incubator warm, use a soil moisture sensor. (a) True (b) False
20. 20.🔍 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
21. 21.Which job needs a sound sensor? (a) switch on with a clap (b) start a fan when hot (c) make a parking alarm (d) open blinds at sunrise
22. 22.🔍 Which sensor would you use to water a dry plant? (a) a gas sensor (b) a rain sensor (c) a soil moisture sensor (d) a light sensor
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.Which job needs a servo motor? (a) show a status light (b) turn to an exact angle (c) show the temperature (d) move water to plants
25. 25.Which job needs a display? (a) show a status light (b) show the temperature (c) move water to plants (d) spin a robot’s wheels
26. 26.Which job needs a gas sensor? (a) spot someone walking in (b) make a parking alarm (c) water a dry plant (d) warn of a gas leak
27. 27.🔍 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)?
28. 28.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) an LED (c) a display (d) a motor
29. 29.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
30. 30.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a buzzer (c) a servo motor (d) an LED
31. 31.Which job needs a light sensor? (a) make a parking alarm (b) warn of a gas leak (c) water a dry plant (d) switch on lamps at dusk
32. 32.True or false: to spot someone walking in, use a distance sensor. (a) True (b) False
33. 33.🔍 Which sensor would you use to keep an incubator warm? (a) a gas sensor (b) a motion sensor (c) a distance sensor (d) a temperature sensor
34. 34.Which job needs a light sensor? (a) spot someone walking in (b) start a fan when hot (c) open blinds at sunrise (d) close a window in rain
35. 35.🔍 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?
36. 36.🔍 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
37. 37.True or false: to start a fan when hot, use a motion sensor. (a) True (b) False
38. 38.🔍 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)?
39. 39.True or false: to spot someone walking in, use a sound sensor. (a) True (b) False
40. 40.🔍 Which sensor would you use to spot someone walking in? (a) a temperature sensor (b) a soil moisture sensor (c) a light sensor (d) a motion sensor

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