Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 7 · 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 measure classroom noise, use a gas sensor. (a) True (b) False
2. 2.True or false: to water a dry plant, use a soil moisture sensor. (a) True (b) False
3. 3.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an input (d) an output
4. 4.Which job needs a rain sensor? (a) start a fan when hot (b) measure classroom noise (c) warn of a gas leak (d) close a window in rain
5. 5.Which job needs a motor? (a) turn to an exact angle (b) spin a robot’s wheels (c) open a gate to 90° (d) move water to plants
6. 6.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) a buzzer (c) a pump (d) a motor
7. 7.Which job needs a motion sensor? (a) stop a robot near walls (b) water a dry plant (c) spot someone walking in (d) switch on with a clap
8. 8.🔍 Which sensor would you use to keep an incubator warm? (a) a sound sensor (b) a gas sensor (c) a temperature sensor (d) a light sensor
9. 9.Which job needs a servo motor? (a) open a gate to 90° (b) beep an alarm (c) show the temperature (d) spin a robot’s wheels
10. 10.Which job needs a soil moisture sensor? (a) close a window in rain (b) measure classroom noise (c) water a dry plant (d) make a parking alarm
11. 11.🔍 Which sensor would you use to water a dry plant? (a) a gas sensor (b) a motion sensor (c) a temperature sensor (d) a soil moisture sensor
12. 12.⚙️ Which actuator would you use to beep an alarm? (a) a servo motor (b) a buzzer (c) a display (d) a motor
13. 13.🔍 Which sensor would you use to warn of a gas leak? (a) a rain sensor (b) a distance sensor (c) a gas sensor (d) a soil moisture sensor
14. 14.🔍 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)?
15. 15.⚙️ What is an actuator? (a) a sensor (b) a program (c) an output that acts (d) a battery
16. 16.⚙️ Which actuator would you use to open a gate to 90°? (a) a buzzer (b) a motor (c) a display (d) a servo motor
17. 17.True or false: to spot someone walking in, use a soil moisture sensor. (a) True (b) False
18. 18.⚙️ Which actuator would you use to turn to an exact angle? (a) an LED (b) a servo motor (c) a pump (d) a motor
19. 19.🔍 Which sensor would you use to measure classroom noise? (a) a light sensor (b) a distance sensor (c) a temperature sensor (d) a sound sensor
20. 20.🔍 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?
21. 21.Which job needs a gas sensor? (a) close a window in rain (b) make a parking alarm (c) switch on with a clap (d) warn of a gas leak
22. 22.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
23. 23.Which job needs a sound sensor? (a) switch on lamps at dusk (b) close a window in rain (c) water a dry plant (d) measure classroom noise
24. 24.🔍 Which sensor would you use to switch on lamps at dusk? (a) a rain sensor (b) a gas sensor (c) a light sensor (d) a soil moisture sensor
25. 25.Which job needs a temperature sensor? (a) start a fan when hot (b) make a parking alarm (c) switch on lamps at dusk (d) close a window in rain
26. 26.True or false: to start a fan when hot, use a distance sensor. (a) False (b) True
27. 27.Which job needs a temperature sensor? (a) switch on with a clap (b) keep an incubator warm (c) make a parking alarm (d) warn of a gas leak
28. 28.Which job needs a distance sensor? (a) keep an incubator warm (b) stop a robot near walls (c) open blinds at sunrise (d) warn of a gas leak
29. 29.🔍 Which sensor would you use to switch on with a clap? (a) a gas sensor (b) a soil moisture sensor (c) a rain sensor (d) a sound sensor
30. 30.Which job needs an LED? (a) turn to an exact angle (b) show the temperature (c) open a gate to 90° (d) show a status light
31. 31.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
32. 32.⚙️ Which actuator would you use to show the temperature? (a) a servo motor (b) an LED (c) a motor (d) a display
33. 33.Which job needs a light sensor? (a) switch on with a clap (b) water a dry plant (c) switch on lamps at dusk (d) measure classroom noise
34. 34.🔍 An object is 51 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 close a window in rain, use a rain sensor. (a) False (b) True
36. 36.Which job needs a pump? (a) show the temperature (b) spin a robot’s wheels (c) beep an alarm (d) move water to plants
37. 37.Which job needs a buzzer? (a) spin a robot’s wheels (b) turn to an exact angle (c) open a gate to 90° (d) beep an alarm
38. 38.True or false: to open blinds at sunrise, use a soil moisture sensor. (a) False (b) True
39. 39.🔍 Which sensor would you use to open blinds at sunrise? (a) a sound sensor (b) a rain sensor (c) a gas sensor (d) a light sensor
40. 40.🔍 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?

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