Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 58 · 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 measure classroom noise? (a) a motion sensor (b) a temperature sensor (c) a sound sensor (d) a distance sensor
2. 2.🔍 Which sensor would you use to warn of a gas leak? (a) a temperature sensor (b) a gas sensor (c) a motion sensor (d) a light sensor
3. 3.🔍 Which sensor would you use to spot someone walking in? (a) a sound sensor (b) a temperature sensor (c) a distance sensor (d) a motion sensor
4. 4.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
5. 5.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) an input (c) a power source (d) a fuse
6. 6.🔍 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
7. 7.Which job needs a temperature sensor? (a) keep an incubator warm (b) make a parking alarm (c) stop a robot near walls (d) warn of a gas leak
8. 8.Which job needs a soil moisture sensor? (a) open blinds at sunrise (b) switch on with a clap (c) stop a robot near walls (d) water a dry plant
9. 9.🔍 Which sensor would you use to open blinds at sunrise? (a) a gas sensor (b) a distance sensor (c) a light sensor (d) a temperature sensor
10. 10.🔍 Which sensor would you use to water a dry plant? (a) a distance sensor (b) a temperature sensor (c) a soil moisture sensor (d) a sound sensor
11. 11.🔍 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?
12. 12.Which job needs a pump? (a) spin a robot’s wheels (b) turn to an exact angle (c) move water to plants (d) open a gate to 90°
13. 13.🔍 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?
14. 14.Which job needs a distance sensor? (a) close a window in rain (b) switch on with a clap (c) stop a robot near walls (d) keep an incubator warm
15. 15.⚙️ What is an actuator? (a) a program (b) a sensor (c) an output that acts (d) a battery
16. 16.Which job needs a light sensor? (a) warn of a gas leak (b) open blinds at sunrise (c) spot someone walking in (d) keep an incubator warm
17. 17.🔍 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)?
18. 18.⚙️ Which actuator would you use to beep an alarm? (a) a display (b) an LED (c) a buzzer (d) a pump
19. 19.Which job needs a gas sensor? (a) switch on lamps at dusk (b) make a parking alarm (c) warn of a gas leak (d) keep an incubator warm
20. 20.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) a servo motor (c) a buzzer (d) an LED
21. 21.🔍 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)?
22. 22.🔍 Which sensor would you use to stop a robot near walls? (a) a motion sensor (b) a distance sensor (c) a gas sensor (d) a soil moisture sensor
23. 23.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
24. 24.Which job needs a servo motor? (a) show a status light (b) turn to an exact angle (c) spin a robot’s wheels (d) beep an alarm
25. 25.🔍 Which sensor would you use to make a parking alarm? (a) a light sensor (b) a temperature sensor (c) a distance sensor (d) a gas sensor
26. 26.Which job needs a motion sensor? (a) warn of a gas leak (b) spot someone walking in (c) stop a robot near walls (d) open blinds at sunrise
27. 27.🔍 Which sensor would you use to switch on lamps at dusk? (a) a soil moisture sensor (b) a distance sensor (c) a light sensor (d) a rain sensor
28. 28.🔍 Which sensor would you use to start a fan when hot? (a) a light sensor (b) a temperature sensor (c) a gas sensor (d) a soil moisture sensor
29. 29.True or false: to warn of a gas leak, use a sound sensor. (a) False (b) True
30. 30.Which job needs a display? (a) beep an alarm (b) spin a robot’s wheels (c) move water to plants (d) show the temperature
31. 31.⚙️ Which actuator would you use to show the temperature? (a) a display (b) an LED (c) a buzzer (d) a pump
32. 32.Which job needs a servo motor? (a) show the temperature (b) beep an alarm (c) move water to plants (d) open a gate to 90°
33. 33.🔍 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
34. 34.True or false: to close a window in rain, use a motion sensor. (a) True (b) False
35. 35.🔍 Which sensor would you use to switch on with a clap? (a) a distance sensor (b) a sound sensor (c) a gas sensor (d) a light sensor
36. 36.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) a servo motor (c) a buzzer (d) a pump
37. 37.Which job needs a sound sensor? (a) stop a robot near walls (b) spot someone walking in (c) switch on with a clap (d) open blinds at sunrise
38. 38.True or false: to make a parking alarm, use a motion sensor. (a) False (b) True
39. 39.🔍 Which sensor would you use to keep an incubator warm? (a) a soil moisture sensor (b) a motion sensor (c) a temperature sensor (d) a distance sensor
40. 40.Which job needs a motor? (a) show a status light (b) turn to an exact angle (c) spin a robot’s wheels (d) show the temperature

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