Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 53 · 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 start a fan when hot? (a) a gas sensor (b) a temperature sensor (c) a motion sensor (d) a light sensor
2. 2.🔍 Which sensor would you use to open blinds at sunrise? (a) a temperature sensor (b) a soil moisture sensor (c) a rain sensor (d) a light sensor
3. 3.⚙️ Which actuator would you use to turn to an exact angle? (a) a display (b) a buzzer (c) a pump (d) a servo motor
4. 4.🔍 Which sensor would you use to keep an incubator warm? (a) a soil moisture sensor (b) a distance sensor (c) a motion sensor (d) a temperature sensor
5. 5.True or false: to keep an incubator warm, use a sound sensor. (a) False (b) True
6. 6.Which job needs a gas sensor? (a) warn of a gas leak (b) keep an incubator warm (c) stop a robot near walls (d) make a parking alarm
7. 7.🔍 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
8. 8.⚙️ Which actuator would you use to spin a robot’s wheels? (a) an LED (b) a motor (c) a buzzer (d) a pump
9. 9.True or false: to measure classroom noise, use a temperature sensor. (a) False (b) True
10. 10.🔍 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
11. 11.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a fuse (c) a power source (d) an output
12. 12.Which job needs a servo motor? (a) turn to an exact angle (b) show the temperature (c) show a status light (d) spin a robot’s wheels
13. 13.⚙️ What is an actuator? (a) a battery (b) a sensor (c) a program (d) an output that acts
14. 14.Which job needs a distance sensor? (a) stop a robot near walls (b) start a fan when hot (c) water a dry plant (d) switch on with a clap
15. 15.Which job needs a motor? (a) turn to an exact angle (b) beep an alarm (c) show the temperature (d) spin a robot’s wheels
16. 16.True or false: to make a parking alarm, use a rain sensor. (a) True (b) False
17. 17.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a motor (c) an LED (d) a servo motor
18. 18.🔍 Which sensor would you use to switch on lamps at dusk? (a) a temperature sensor (b) a light sensor (c) a rain sensor (d) a motion sensor
19. 19.Which job needs an LED? (a) show a status light (b) turn to an exact angle (c) beep an alarm (d) show the temperature
20. 20.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a motor (c) a display (d) a buzzer
21. 21.🔍 Which sensor would you use to spot someone walking in? (a) a light sensor (b) a temperature sensor (c) a soil moisture sensor (d) a motion sensor
22. 22.True or false: to measure classroom noise, use a light sensor. (a) False (b) True
23. 23.Which job needs a motion sensor? (a) spot someone walking in (b) measure classroom noise (c) water a dry plant (d) switch on lamps at dusk
24. 24.True or false: to water a dry plant, use a temperature sensor. (a) True (b) False
25. 25.Which job needs a soil moisture sensor? (a) open blinds at sunrise (b) water a dry plant (c) make a parking alarm (d) warn of a gas leak
26. 26.🔍 Which sensor would you use to measure classroom noise? (a) a motion sensor (b) a sound sensor (c) a gas sensor (d) a soil moisture sensor
27. 27.Which job needs a buzzer? (a) move water to plants (b) spin a robot’s wheels (c) open a gate to 90° (d) beep an alarm
28. 28.Which job needs a display? (a) beep an alarm (b) turn to an exact angle (c) show the temperature (d) show a status light
29. 29.🔍 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)?
30. 30.🔍 Which sensor would you use to close a window in rain? (a) a sound sensor (b) a distance sensor (c) a soil moisture sensor (d) a rain sensor
31. 31.Which job needs a sound sensor? (a) spot someone walking in (b) open blinds at sunrise (c) warn of a gas leak (d) measure classroom noise
32. 32.True or false: to switch on with a clap, use a soil moisture sensor. (a) False (b) True
33. 33.Which job needs a light sensor? (a) close a window in rain (b) start a fan when hot (c) stop a robot near walls (d) switch on lamps at dusk
34. 34.True or false: to switch on lamps at dusk, use a distance sensor. (a) False (b) True
35. 35.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a light sensor (c) a sound sensor (d) a motion sensor
36. 36.🔍 Which sensor would you use to switch on with a clap? (a) a gas sensor (b) a motion sensor (c) a soil moisture sensor (d) a sound sensor
37. 37.Which job needs a temperature sensor? (a) water a dry plant (b) spot someone walking in (c) keep an incubator warm (d) make a parking alarm
38. 38.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
39. 39.🔍 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?
40. 40.⚙️ Which actuator would you use to open a gate to 90°? (a) a buzzer (b) an LED (c) a pump (d) a servo motor

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