Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 217 · 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 switch on lamps at dusk? (a) a rain sensor (b) a temperature sensor (c) a soil moisture sensor (d) a light sensor
2. 2.Which job needs a pump? (a) open a gate to 90° (b) move water to plants (c) turn to an exact angle (d) show a status light
3. 3.🔍 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)?
4. 4.Which job needs a sound sensor? (a) keep an incubator warm (b) open blinds at sunrise (c) make a parking alarm (d) switch on with a clap
5. 5.True or false: to switch on with a clap, use a light sensor. (a) False (b) True
6. 6.⚙️ What is an actuator? (a) a sensor (b) a program (c) a battery (d) an output that acts
7. 7.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) an LED (c) a motor (d) a buzzer
8. 8.⚙️ Which actuator would you use to move water to plants? (a) a motor (b) a display (c) a pump (d) an LED
9. 9.True or false: to water a dry plant, use a rain sensor. (a) True (b) False
10. 10.Which job needs a soil moisture sensor? (a) switch on lamps at dusk (b) water a dry plant (c) warn of a gas leak (d) measure classroom noise
11. 11.🔍 Which sensor would you use to start a fan when hot? (a) a light sensor (b) a rain sensor (c) a gas sensor (d) a temperature sensor
12. 12.True or false: to spot someone walking in, use a sound sensor. (a) False (b) True
13. 13.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
14. 14.True or false: to switch on lamps at dusk, use a motion sensor. (a) False (b) True
15. 15.Which job needs a gas sensor? (a) keep an incubator warm (b) switch on lamps at dusk (c) warn of a gas leak (d) water a dry plant
16. 16.True or false: to switch on with a clap, use a gas sensor. (a) True (b) False
17. 17.Which job needs a motion sensor? (a) warn of a gas leak (b) stop a robot near walls (c) spot someone walking in (d) start a fan when hot
18. 18.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
19. 19.🔍 Which sensor would you use to warn of a gas leak? (a) a motion sensor (b) a temperature sensor (c) a gas sensor (d) a light sensor
20. 20.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a power source (c) an input (d) a fuse
21. 21.Which job needs a distance sensor? (a) warn of a gas leak (b) keep an incubator warm (c) switch on lamps at dusk (d) stop a robot near walls
22. 22.⚙️ Which actuator would you use to open a gate to 90°? (a) a display (b) a buzzer (c) a pump (d) a servo motor
23. 23.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) an LED (c) a servo motor (d) a display
24. 24.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a temperature sensor (c) a light sensor (d) a distance sensor
25. 25.⚙️ Which actuator would you use to show a status light? (a) a display (b) an LED (c) a pump (d) a buzzer
26. 26.Which job needs a buzzer? (a) move water to plants (b) show a status light (c) beep an alarm (d) open a gate to 90°
27. 27.Which job needs a servo motor? (a) beep an alarm (b) show the temperature (c) show a status light (d) turn to an exact angle
28. 28.🔍 Which sensor would you use to make a parking alarm? (a) a temperature sensor (b) a distance sensor (c) a light sensor (d) a rain sensor
29. 29.Which job needs a motor? (a) beep an alarm (b) move water to plants (c) show a status light (d) spin a robot’s wheels
30. 30.True or false: to switch on with a clap, use a distance sensor. (a) True (b) False
31. 31.True or false: to water a dry plant, use a temperature sensor. (a) True (b) False
32. 32.Which job needs a temperature sensor? (a) keep an incubator warm (b) switch on lamps at dusk (c) open blinds at sunrise (d) stop a robot near walls
33. 33.Which job needs an LED? (a) show a status light (b) spin a robot’s wheels (c) move water to plants (d) turn to an exact angle
34. 34.🔍 Which sensor would you use to switch on with a clap? (a) a soil moisture sensor (b) a sound sensor (c) a light sensor (d) a temperature sensor
35. 35.Which job needs a display? (a) show a status light (b) spin a robot’s wheels (c) show the temperature (d) beep an alarm
36. 36.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
37. 37.🔍 Which sensor would you use to open blinds at sunrise? (a) a gas sensor (b) a rain sensor (c) a light sensor (d) a sound sensor
38. 38.🔍 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?
39. 39.True or false: to make a parking alarm, use a sound sensor. (a) True (b) False
40. 40.🔍 An object is 204 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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