Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 313 · 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 job needs a sound sensor? (a) warn of a gas leak (b) switch on with a clap (c) spot someone walking in (d) water a dry plant
2. 2.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
3. 3.Which job needs a servo motor? (a) show the temperature (b) turn to an exact angle (c) show a status light (d) spin a robot’s wheels
4. 4.Which job needs an LED? (a) turn to an exact angle (b) show a status light (c) show the temperature (d) spin a robot’s wheels
5. 5.Which job needs a buzzer? (a) turn to an exact angle (b) spin a robot’s wheels (c) beep an alarm (d) show the temperature
6. 6.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an input (c) an output (d) a fuse
7. 7.⚙️ What is an actuator? (a) a program (b) an output that acts (c) a battery (d) a sensor
8. 8.🔍 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?
9. 9.⚙️ Which actuator would you use to show the temperature? (a) a buzzer (b) an LED (c) a display (d) a motor
10. 10.True or false: to stop a robot near walls, use a gas sensor. (a) True (b) False
11. 11.Which job needs a soil moisture sensor? (a) spot someone walking in (b) make a parking alarm (c) switch on with a clap (d) water a dry plant
12. 12.🔍 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
13. 13.True or false: to open blinds at sunrise, use a gas sensor. (a) True (b) False
14. 14.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a sound sensor (c) a distance sensor (d) a rain sensor
15. 15.🔍 Which sensor would you use to measure classroom noise? (a) a soil moisture sensor (b) a motion sensor (c) a sound sensor (d) a gas sensor
16. 16.Which job needs a pump? (a) spin a robot’s wheels (b) move water to plants (c) show the temperature (d) turn to an exact angle
17. 17.🔍 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?
18. 18.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a buzzer (c) an LED (d) a motor
19. 19.🔍 Which sensor would you use to keep an incubator warm? (a) a soil moisture sensor (b) a gas sensor (c) a sound sensor (d) a temperature sensor
20. 20.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a buzzer (c) a servo motor (d) a display
21. 21.⚙️ Which actuator would you use to beep an alarm? (a) a motor (b) a buzzer (c) a servo motor (d) a pump
22. 22.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
23. 23.Which job needs a light sensor? (a) water a dry plant (b) open blinds at sunrise (c) close a window in rain (d) keep an incubator warm
24. 24.🔍 Which sensor would you use to start a fan when hot? (a) a distance sensor (b) a motion sensor (c) a light sensor (d) a temperature sensor
25. 25.Which job needs a distance sensor? (a) water a dry plant (b) open blinds at sunrise (c) spot someone walking in (d) make a parking alarm
26. 26.Which job needs a display? (a) show the temperature (b) move water to plants (c) beep an alarm (d) open a gate to 90°
27. 27.Which job needs a gas sensor? (a) keep an incubator warm (b) warn of a gas leak (c) water a dry plant (d) stop a robot near walls
28. 28.Which job needs a servo motor? (a) beep an alarm (b) show the temperature (c) move water to plants (d) open a gate to 90°
29. 29.🔍 Which sensor would you use to switch on lamps at dusk? (a) a light sensor (b) a soil moisture sensor (c) a gas sensor (d) a sound sensor
30. 30.True or false: to switch on with a clap, use a motion sensor. (a) False (b) True
31. 31.🔍 Which sensor would you use to warn of a gas leak? (a) a distance sensor (b) a light sensor (c) a temperature sensor (d) a gas sensor
32. 32.🔍 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)?
33. 33.🔍 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)?
34. 34.🔍 Which sensor would you use to close a window in rain? (a) a motion sensor (b) a temperature sensor (c) a soil moisture sensor (d) a rain sensor
35. 35.Which job needs a motor? (a) show the temperature (b) show a status light (c) spin a robot’s wheels (d) turn to an exact angle
36. 36.True or false: to switch on with a clap, use a distance sensor. (a) False (b) True
37. 37.True or false: to measure classroom noise, use a gas sensor. (a) False (b) True
38. 38.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a display (c) a pump (d) a servo motor
39. 39.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
40. 40.🔍 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?

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