Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 73 · 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.⚙️ What is an actuator? (a) a sensor (b) a program (c) an output that acts (d) a battery
2. 2.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
3. 3.🔍 Which sensor would you use to switch on lamps at dusk? (a) a motion sensor (b) a distance sensor (c) a temperature sensor (d) a light sensor
4. 4.Which job needs a motor? (a) show the temperature (b) turn to an exact angle (c) spin a robot’s wheels (d) show a status light
5. 5.True or false: to start a fan when hot, use a sound sensor. (a) False (b) True
6. 6.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a fuse (c) a power source (d) an input
7. 7.🔍 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
8. 8.Which job needs a buzzer? (a) turn to an exact angle (b) open a gate to 90° (c) beep an alarm (d) spin a robot’s wheels
9. 9.Which job needs a temperature sensor? (a) start a fan when hot (b) open blinds at sunrise (c) make a parking alarm (d) spot someone walking in
10. 10.Which job needs an LED? (a) spin a robot’s wheels (b) show the temperature (c) turn to an exact angle (d) show a status light
11. 11.Which job needs a sound sensor? (a) warn of a gas leak (b) water a dry plant (c) measure classroom noise (d) open blinds at sunrise
12. 12.🔍 Which sensor would you use to close a window in rain? (a) a light sensor (b) a soil moisture sensor (c) a rain sensor (d) a distance sensor
13. 13.Which job needs a distance sensor? (a) switch on with a clap (b) open blinds at sunrise (c) spot someone walking in (d) make a parking alarm
14. 14.Which job needs a light sensor? (a) open blinds at sunrise (b) start a fan when hot (c) keep an incubator warm (d) make a parking alarm
15. 15.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
16. 16.🔍 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
17. 17.🔍 Which sensor would you use to water a dry plant? (a) a distance sensor (b) a light sensor (c) a sound sensor (d) a soil moisture sensor
18. 18.Which job needs a distance sensor? (a) start a fan when hot (b) open blinds at sunrise (c) switch on with a clap (d) stop a robot near walls
19. 19.🔍 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)?
20. 20.Which job needs a soil moisture sensor? (a) switch on lamps at dusk (b) open blinds at sunrise (c) water a dry plant (d) close a window in rain
21. 21.Which job needs a gas sensor? (a) warn of a gas leak (b) switch on lamps at dusk (c) keep an incubator warm (d) water a dry plant
22. 22.🔍 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?
23. 23.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a buzzer (c) a display (d) a servo motor
24. 24.⚙️ Which actuator would you use to show a status light? (a) a motor (b) an LED (c) a buzzer (d) a servo motor
25. 25.🔍 Which sensor would you use to stop a robot near walls? (a) a soil moisture sensor (b) a light sensor (c) a sound sensor (d) a distance sensor
26. 26.True or false: to stop a robot near walls, use a sound sensor. (a) False (b) True
27. 27.Which job needs a motion sensor? (a) warn of a gas leak (b) spot someone walking in (c) start a fan when hot (d) water a dry plant
28. 28.🔍 Which sensor would you use to measure classroom noise? (a) a gas sensor (b) a distance sensor (c) a rain sensor (d) a sound sensor
29. 29.Which job needs a rain sensor? (a) close a window in rain (b) keep an incubator warm (c) water a dry plant (d) make a parking alarm
30. 30.True or false: to water a dry plant, use a gas sensor. (a) False (b) True
31. 31.🔍 Which sensor would you use to switch on with a clap? (a) a rain sensor (b) a sound sensor (c) a distance sensor (d) a temperature sensor
32. 32.⚙️ Which actuator would you use to move water to plants? (a) a motor (b) a display (c) a pump (d) an LED
33. 33.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
34. 34.True or false: to open blinds at sunrise, use a motion sensor. (a) True (b) False
35. 35.Which job needs a sound sensor? (a) spot someone walking in (b) warn of a gas leak (c) switch on with a clap (d) water a dry plant
36. 36.Which job needs a light sensor? (a) close a window in rain (b) keep an incubator warm (c) make a parking alarm (d) switch on lamps at dusk
37. 37.Which job needs a pump? (a) turn to an exact angle (b) show the temperature (c) open a gate to 90° (d) move water to plants
38. 38.Which job needs a display? (a) turn to an exact angle (b) move water to plants (c) show the temperature (d) beep an alarm
39. 39.⚙️ Which actuator would you use to beep an alarm? (a) a servo motor (b) a display (c) a buzzer (d) a pump
40. 40.🔍 Which sensor would you use to warn of a gas leak? (a) a temperature sensor (b) a sound sensor (c) a gas sensor (d) a motion sensor

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