Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 179 · 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 gas sensor (b) a motion sensor (c) a temperature sensor (d) a sound sensor
2. 2.🔍 Which sensor would you use to switch on lamps at dusk? (a) a motion sensor (b) a gas sensor (c) a sound sensor (d) a light sensor
3. 3.🔍 Which sensor would you use to start a fan when hot? (a) a sound sensor (b) a soil moisture sensor (c) a gas sensor (d) a temperature sensor
4. 4.Which job needs a motor? (a) open a gate to 90° (b) show a status light (c) turn to an exact angle (d) spin a robot’s wheels
5. 5.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) a fuse (c) an input (d) an output
6. 6.Which job needs a buzzer? (a) spin a robot’s wheels (b) open a gate to 90° (c) show a status light (d) beep an alarm
7. 7.🔍 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)?
8. 8.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a soil moisture sensor (c) a motion sensor (d) a light sensor
9. 9.Which job needs an LED? (a) spin a robot’s wheels (b) show a status light (c) open a gate to 90° (d) move water to plants
10. 10.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
11. 11.🔍 Which sensor would you use to spot someone walking in? (a) a gas sensor (b) a sound sensor (c) a motion sensor (d) a light sensor
12. 12.⚙️ What is an actuator? (a) a battery (b) a sensor (c) a program (d) an output that acts
13. 13.Which job needs a pump? (a) move water to plants (b) turn to an exact angle (c) show a status light (d) beep an alarm
14. 14.🔍 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?
15. 15.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
16. 16.🔍 Which sensor would you use to stop a robot near walls? (a) a gas sensor (b) a rain sensor (c) a distance sensor (d) a sound sensor
17. 17.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) a motor (c) a display (d) a pump
18. 18.Which job needs a light sensor? (a) close a window in rain (b) warn of a gas leak (c) start a fan when hot (d) switch on lamps at dusk
19. 19.🔍 Which sensor would you use to warn of a gas leak? (a) a distance sensor (b) a gas sensor (c) a rain sensor (d) a temperature sensor
20. 20.True or false: to make a parking alarm, use a rain sensor. (a) True (b) False
21. 21.Which job needs a display? (a) beep an alarm (b) show the temperature (c) turn to an exact angle (d) spin a robot’s wheels
22. 22.Which job needs a rain sensor? (a) measure classroom noise (b) switch on lamps at dusk (c) close a window in rain (d) keep an incubator warm
23. 23.⚙️ Which actuator would you use to move water to plants? (a) a display (b) a pump (c) an LED (d) a servo motor
24. 24.Which job needs a temperature sensor? (a) water a dry plant (b) keep an incubator warm (c) open blinds at sunrise (d) warn of a gas leak
25. 25.True or false: to switch on with a clap, use a soil moisture sensor. (a) True (b) False
26. 26.True or false: to make a parking alarm, use a temperature sensor. (a) False (b) True
27. 27.True or false: to switch on with a clap, use a light sensor. (a) True (b) False
28. 28.Which job needs a temperature sensor? (a) start a fan when hot (b) switch on lamps at dusk (c) water a dry plant (d) open blinds at sunrise
29. 29.🔍 Which sensor would you use to open blinds at sunrise? (a) a rain sensor (b) a light sensor (c) a temperature sensor (d) a distance sensor
30. 30.⚙️ Which actuator would you use to show a status light? (a) a display (b) a buzzer (c) a pump (d) an LED
31. 31.🔍 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
32. 32.🔍 A distance sensor sends a sound pulse and hears the echo 1 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 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
34. 34.True or false: to warn of a gas leak, use a temperature sensor. (a) True (b) False
35. 35.⚙️ Which actuator would you use to show the temperature? (a) a buzzer (b) a pump (c) a display (d) a motor
36. 36.🔍 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
37. 37.🔍 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)?
38. 38.Which job needs a gas sensor? (a) warn of a gas leak (b) make a parking alarm (c) water a dry plant (d) switch on lamps at dusk
39. 39.Which job needs a distance sensor? (a) make a parking alarm (b) start a fan when hot (c) switch on lamps at dusk (d) keep an incubator warm
40. 40.🔍 An object is 289 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?

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