Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 122 · 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.True or false: to switch on with a clap, use a temperature sensor. (a) True (b) False
2. 2.Which job needs a sound sensor? (a) measure classroom noise (b) make a parking alarm (c) keep an incubator warm (d) stop a robot near walls
3. 3.True or false: to open blinds at sunrise, use a temperature sensor. (a) True (b) False
4. 4.Which job needs a motor? (a) beep an alarm (b) show a status light (c) move water to plants (d) spin a robot’s wheels
5. 5.🔍 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
6. 6.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a servo motor (c) a pump (d) a display
7. 7.Which job needs a pump? (a) turn to an exact angle (b) beep an alarm (c) move water to plants (d) show a status light
8. 8.Which job needs a buzzer? (a) beep an alarm (b) show a status light (c) move water to plants (d) show the temperature
9. 9.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) a display (c) a buzzer (d) an LED
10. 10.🔍 Which sensor would you use to measure classroom noise? (a) a gas sensor (b) a sound sensor (c) a motion sensor (d) a soil moisture sensor
11. 11.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
12. 12.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a fuse (c) a power source (d) an input
13. 13.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a gas sensor (c) a distance sensor (d) a motion sensor
14. 14.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
15. 15.True or false: to start a fan when hot, use a rain sensor. (a) True (b) False
16. 16.🔍 Which sensor would you use to make a parking alarm? (a) a gas sensor (b) a soil moisture sensor (c) a rain sensor (d) a distance sensor
17. 17.🔍 Which sensor would you use to stop a robot near walls? (a) a gas sensor (b) a light sensor (c) a temperature sensor (d) a distance sensor
18. 18.Which job needs a rain sensor? (a) stop a robot near walls (b) spot someone walking in (c) make a parking alarm (d) close a window in rain
19. 19.🔍 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?
20. 20.🔍 Which sensor would you use to switch on lamps at dusk? (a) a distance sensor (b) a sound sensor (c) a gas sensor (d) a light sensor
21. 21.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
22. 22.True or false: to open blinds at sunrise, use a sound sensor. (a) False (b) True
23. 23.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a buzzer (c) a servo motor (d) a display
24. 24.Which job needs a motion sensor? (a) switch on lamps at dusk (b) spot someone walking in (c) start a fan when hot (d) water a dry plant
25. 25.Which job needs a soil moisture sensor? (a) spot someone walking in (b) measure classroom noise (c) switch on lamps at dusk (d) water a dry plant
26. 26.Which job needs an LED? (a) spin a robot’s wheels (b) turn to an exact angle (c) open a gate to 90° (d) show a status light
27. 27.🔍 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)?
28. 28.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a servo motor (c) a buzzer (d) a display
29. 29.🔍 Which sensor would you use to warn of a gas leak? (a) a sound sensor (b) a rain sensor (c) a gas sensor (d) a temperature sensor
30. 30.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
31. 31.Which job needs a gas sensor? (a) spot someone walking in (b) water a dry plant (c) start a fan when hot (d) warn of a gas leak
32. 32.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
33. 33.⚙️ What is an actuator? (a) a program (b) a battery (c) a sensor (d) an output that acts
34. 34.🔍 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?
35. 35.True or false: to spot someone walking in, use a soil moisture sensor. (a) True (b) False
36. 36.Which job needs a display? (a) open a gate to 90° (b) show the temperature (c) spin a robot’s wheels (d) move water to plants
37. 37.Which job needs a temperature sensor? (a) switch on lamps at dusk (b) keep an incubator warm (c) spot someone walking in (d) stop a robot near walls
38. 38.🔍 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?
39. 39.🔍 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)?
40. 40.🔍 Which sensor would you use to keep an incubator warm? (a) a light sensor (b) a temperature sensor (c) a motion sensor (d) a gas sensor

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