Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 56 · 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 warn of a gas leak? (a) a temperature sensor (b) a light sensor (c) a soil moisture sensor (d) a gas sensor
2. 2.Which job needs an LED? (a) move water to plants (b) show a status light (c) open a gate to 90° (d) turn to an exact angle
3. 3.True or false: to spot someone walking in, use a temperature sensor. (a) True (b) False
4. 4.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a display (c) a motor (d) a buzzer
5. 5.Which job needs a servo motor? (a) beep an alarm (b) open a gate to 90° (c) show a status light (d) show the temperature
6. 6.⚙️ What is an actuator? (a) an output that acts (b) a program (c) a sensor (d) a battery
7. 7.True or false: to stop a robot near walls, use a sound sensor. (a) True (b) False
8. 8.Which job needs a motor? (a) spin a robot’s wheels (b) turn to an exact angle (c) move water to plants (d) show a status light
9. 9.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a display (c) a motor (d) a servo motor
10. 10.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
11. 11.⚙️ Which actuator would you use to show a status light? (a) an LED (b) a display (c) a pump (d) a buzzer
12. 12.Which job needs a servo motor? (a) beep an alarm (b) turn to an exact angle (c) show the temperature (d) spin a robot’s wheels
13. 13.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a motor (c) an LED (d) a pump
14. 14.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an input (c) a fuse (d) an output
15. 15.True or false: to switch on lamps at dusk, use a gas sensor. (a) True (b) False
16. 16.Which job needs a motion sensor? (a) spot someone walking in (b) make a parking alarm (c) switch on with a clap (d) keep an incubator warm
17. 17.True or false: to keep an incubator warm, use a gas sensor. (a) True (b) False
18. 18.Which job needs a sound sensor? (a) water a dry plant (b) start a fan when hot (c) close a window in rain (d) measure classroom noise
19. 19.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a sound sensor (c) a motion sensor (d) a soil moisture sensor
20. 20.Which job needs a rain sensor? (a) warn of a gas leak (b) start a fan when hot (c) switch on lamps at dusk (d) close a window in rain
21. 21.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
22. 22.🔍 Which sensor would you use to open blinds at sunrise? (a) a distance sensor (b) a temperature sensor (c) a gas sensor (d) a light sensor
23. 23.True or false: to water a dry plant, use a soil moisture sensor. (a) True (b) False
24. 24.🔍 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)?
25. 25.🔍 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)?
26. 26.Which job needs a pump? (a) turn to an exact angle (b) beep an alarm (c) spin a robot’s wheels (d) move water to plants
27. 27.Which job needs a sound sensor? (a) keep an incubator warm (b) close a window in rain (c) switch on with a clap (d) make a parking alarm
28. 28.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a display (c) a servo motor (d) a buzzer
29. 29.True or false: to make a parking alarm, use a motion sensor. (a) False (b) True
30. 30.Which job needs a buzzer? (a) beep an alarm (b) show a status light (c) spin a robot’s wheels (d) move water to plants
31. 31.True or false: to make a parking alarm, use a rain sensor. (a) False (b) True
32. 32.🔍 Which sensor would you use to make a parking alarm? (a) a gas sensor (b) a motion sensor (c) a temperature sensor (d) a distance sensor
33. 33.🔍 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)?
34. 34.Which job needs a soil moisture sensor? (a) make a parking alarm (b) open blinds at sunrise (c) close a window in rain (d) water a dry plant
35. 35.🔍 Which sensor would you use to measure classroom noise? (a) a light sensor (b) a sound sensor (c) a temperature sensor (d) a gas sensor
36. 36.🔍 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)?
37. 37.True or false: to spot someone walking in, use a distance sensor. (a) False (b) True
38. 38.🔍 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
39. 39.🔍 Which sensor would you use to stop a robot near walls? (a) a motion sensor (b) a soil moisture sensor (c) a distance sensor (d) a sound sensor
40. 40.True or false: to start a fan when hot, use a soil moisture sensor. (a) False (b) True

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