Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 103 · 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) a power source (b) an input (c) a fuse (d) an output
2. 2.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a display (c) a buzzer (d) an LED
3. 3.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) a servo motor (c) a buzzer (d) a pump
4. 4.🔍 Which sensor would you use to water a dry plant? (a) a soil moisture sensor (b) a distance sensor (c) a motion sensor (d) a rain sensor
5. 5.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a soil moisture sensor (c) a gas sensor (d) a light sensor
6. 6.⚙️ What is an actuator? (a) an output that acts (b) a battery (c) a program (d) a sensor
7. 7.Which job needs a motor? (a) spin a robot’s wheels (b) show a status light (c) move water to plants (d) beep an alarm
8. 8.🔍 Which sensor would you use to switch on lamps at dusk? (a) a distance sensor (b) a motion sensor (c) a gas sensor (d) a light sensor
9. 9.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
10. 10.Which job needs a buzzer? (a) beep an alarm (b) move water to plants (c) show a status light (d) open a gate to 90°
11. 11.🔍 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
12. 12.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
13. 13.🔍 Which sensor would you use to spot someone walking in? (a) a soil moisture sensor (b) a motion sensor (c) a rain sensor (d) a light sensor
14. 14.True or false: to switch on lamps at dusk, use a motion sensor. (a) True (b) False
15. 15.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
16. 16.🔍 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)?
17. 17.🔍 Which sensor would you use to warn of a gas leak? (a) a sound sensor (b) a temperature sensor (c) a soil moisture sensor (d) a gas sensor
18. 18.🔍 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
19. 19.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) a display (c) a motor (d) a servo motor
20. 20.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a display (c) a pump (d) a servo motor
21. 21.🔍 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)?
22. 22.⚙️ Which actuator would you use to move water to plants? (a) a motor (b) a servo motor (c) a pump (d) an LED
23. 23.Which job needs a distance sensor? (a) make a parking alarm (b) water a dry plant (c) open blinds at sunrise (d) start a fan when hot
24. 24.🔍 Which sensor would you use to close a window in rain? (a) a gas sensor (b) a sound sensor (c) a rain sensor (d) a motion sensor
25. 25.Which job needs a sound sensor? (a) water a dry plant (b) open blinds at sunrise (c) start a fan when hot (d) switch on with a clap
26. 26.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a rain sensor (c) a temperature sensor (d) a sound sensor
27. 27.Which job needs a gas sensor? (a) spot someone walking in (b) switch on lamps at dusk (c) warn of a gas leak (d) water a dry plant
28. 28.🔍 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?
29. 29.True or false: to warn of a gas leak, use a rain sensor. (a) True (b) False
30. 30.🔍 Which sensor would you use to stop a robot near walls? (a) a gas sensor (b) a distance sensor (c) a soil moisture sensor (d) a temperature sensor
31. 31.Which job needs a display? (a) turn to an exact angle (b) spin a robot’s wheels (c) open a gate to 90° (d) show the temperature
32. 32.🔍 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
33. 33.Which job needs a rain sensor? (a) close a window in rain (b) start a fan when hot (c) make a parking alarm (d) water a dry plant
34. 34.Which job needs a distance sensor? (a) spot someone walking in (b) stop a robot near walls (c) open blinds at sunrise (d) switch on lamps at dusk
35. 35.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
36. 36.🔍 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)?
37. 37.Which job needs a sound sensor? (a) switch on lamps at dusk (b) keep an incubator warm (c) measure classroom noise (d) water a dry plant
38. 38.Which job needs an LED? (a) move water to plants (b) show a status light (c) turn to an exact angle (d) spin a robot’s wheels
39. 39.🔍 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
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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