Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 171 · 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 soil moisture sensor? (a) measure classroom noise (b) switch on lamps at dusk (c) open blinds at sunrise (d) water a dry plant
2. 2.Which job needs a motor? (a) beep an alarm (b) spin a robot’s wheels (c) turn to an exact angle (d) open a gate to 90°
3. 3.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
4. 4.🔍 Which sensor would you use to switch on lamps at dusk? (a) a soil moisture sensor (b) a motion sensor (c) a light sensor (d) a gas sensor
5. 5.Which job needs an LED? (a) show a status light (b) move water to plants (c) open a gate to 90° (d) beep an alarm
6. 6.Which job needs a gas sensor? (a) warn of a gas leak (b) start a fan when hot (c) water a dry plant (d) measure classroom noise
7. 7.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a motor (c) a display (d) a pump
8. 8.Which job needs a rain sensor? (a) switch on with a clap (b) switch on lamps at dusk (c) spot someone walking in (d) close a window in rain
9. 9.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) a buzzer (c) a pump (d) a display
10. 10.🔍 Which sensor would you use to open blinds at sunrise? (a) a motion sensor (b) a temperature sensor (c) a soil moisture sensor (d) a light sensor
11. 11.⚙️ What is an actuator? (a) an output that acts (b) a sensor (c) a program (d) a battery
12. 12.Which job needs a distance sensor? (a) water a dry plant (b) make a parking alarm (c) spot someone walking in (d) close a window in rain
13. 13.Which job needs a temperature sensor? (a) switch on lamps at dusk (b) close a window in rain (c) switch on with a clap (d) start a fan when hot
14. 14.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) an LED (c) a buzzer (d) a pump
15. 15.Which job needs a servo motor? (a) turn to an exact angle (b) beep an alarm (c) show the temperature (d) spin a robot’s wheels
16. 16.🔍 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
17. 17.Which job needs a light sensor? (a) switch on lamps at dusk (b) spot someone walking in (c) close a window in rain (d) start a fan when hot
18. 18.Which job needs a sound sensor? (a) make a parking alarm (b) keep an incubator warm (c) spot someone walking in (d) switch on with a clap
19. 19.Which job needs a buzzer? (a) turn to an exact angle (b) open a gate to 90° (c) show a status light (d) beep an alarm
20. 20.🔍 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?
21. 21.⚙️ Which actuator would you use to show a status light? (a) a pump (b) a servo motor (c) an LED (d) a display
22. 22.True or false: to stop a robot near walls, use a temperature sensor. (a) False (b) True
23. 23.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a display (c) a motor (d) a servo motor
24. 24.Which job needs a distance sensor? (a) measure classroom noise (b) stop a robot near walls (c) switch on lamps at dusk (d) warn of a gas leak
25. 25.Which job needs a servo motor? (a) show the temperature (b) spin a robot’s wheels (c) beep an alarm (d) open a gate to 90°
26. 26.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
27. 27.True or false: to start a fan when hot, use a light sensor. (a) True (b) False
28. 28.Which job needs a temperature sensor? (a) keep an incubator warm (b) water a dry plant (c) switch on with a clap (d) close a window in rain
29. 29.Which job needs a motion sensor? (a) water a dry plant (b) start a fan when hot (c) spot someone walking in (d) switch on lamps at dusk
30. 30.🔍 Which sensor would you use to keep an incubator warm? (a) a motion sensor (b) a sound sensor (c) a light sensor (d) a temperature sensor
31. 31.🔍 Which sensor would you use to stop a robot near walls? (a) a light sensor (b) a sound sensor (c) a rain sensor (d) a distance sensor
32. 32.🔍 An object is 187 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 display? (a) move water to plants (b) turn to an exact angle (c) show the temperature (d) beep an alarm
34. 34.🔍 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)?
35. 35.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an input (d) an output
36. 36.🔍 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?
37. 37.🔍 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
38. 38.🔍 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)?
39. 39.🔍 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)?
40. 40.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False

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