Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 39 · 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 keep an incubator warm? (a) a distance sensor (b) a temperature sensor (c) a gas sensor (d) a light sensor
2. 2.🔍 Which sensor would you use to spot someone walking in? (a) a distance sensor (b) a motion sensor (c) a light sensor (d) a sound sensor
3. 3.True or false: to water a dry plant, use a soil moisture sensor. (a) True (b) False
4. 4.⚙️ What is an actuator? (a) a program (b) a sensor (c) a battery (d) an output that acts
5. 5.⚙️ Which actuator would you use to beep an alarm? (a) a pump (b) a servo motor (c) a buzzer (d) a motor
6. 6.Which job needs a servo motor? (a) show a status light (b) move water to plants (c) beep an alarm (d) turn to an exact angle
7. 7.Which job needs a buzzer? (a) show the temperature (b) beep an alarm (c) move water to plants (d) show a status light
8. 8.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a servo motor (c) an LED (d) a display
9. 9.Which job needs a gas sensor? (a) make a parking alarm (b) measure classroom noise (c) warn of a gas leak (d) water a dry plant
10. 10.🔍 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
11. 11.Which job needs a pump? (a) spin a robot’s wheels (b) beep an alarm (c) move water to plants (d) turn to an exact angle
12. 12.🔍 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)?
13. 13.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
14. 14.🔍 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?
15. 15.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a fuse (c) a power source (d) an output
16. 16.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) an LED (c) a motor (d) a buzzer
17. 17.True or false: to warn of a gas leak, use a rain sensor. (a) False (b) True
18. 18.Which job needs a display? (a) turn to an exact angle (b) show a status light (c) show the temperature (d) beep an alarm
19. 19.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
20. 20.🔍 Which sensor would you use to open blinds at sunrise? (a) a motion sensor (b) a light sensor (c) a rain sensor (d) a soil moisture sensor
21. 21.Which job needs a temperature sensor? (a) spot someone walking in (b) stop a robot near walls (c) water a dry plant (d) start a fan when hot
22. 22.🔍 Which sensor would you use to measure classroom noise? (a) a gas sensor (b) a rain sensor (c) a motion sensor (d) a sound sensor
23. 23.Which job needs a rain sensor? (a) close a window in rain (b) warn of a gas leak (c) keep an incubator warm (d) start a fan when hot
24. 24.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a servo motor (c) a display (d) a motor
25. 25.Which job needs a servo motor? (a) beep an alarm (b) open a gate to 90° (c) spin a robot’s wheels (d) show a status light
26. 26.🔍 Which sensor would you use to switch on with a clap? (a) a rain sensor (b) a motion sensor (c) a distance sensor (d) a sound sensor
27. 27.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) an LED (c) a servo motor (d) a buzzer
28. 28.🔍 Which sensor would you use to close a window in rain? (a) a gas sensor (b) a temperature sensor (c) a soil moisture sensor (d) a rain sensor
29. 29.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
30. 30.Which job needs an LED? (a) spin a robot’s wheels (b) move water to plants (c) open a gate to 90° (d) show a status light
31. 31.Which job needs a soil moisture sensor? (a) switch on lamps at dusk (b) water a dry plant (c) open blinds at sunrise (d) start a fan when hot
32. 32.🔍 Which sensor would you use to switch on lamps at dusk? (a) a light sensor (b) a motion sensor (c) a soil moisture sensor (d) a temperature sensor
33. 33.🔍 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)?
34. 34.Which job needs a light sensor? (a) keep an incubator warm (b) close a window in rain (c) measure classroom noise (d) open blinds at sunrise
35. 35.🔍 Which sensor would you use to water a dry plant? (a) a soil moisture sensor (b) a temperature sensor (c) a gas sensor (d) a light sensor
36. 36.Which job needs a distance sensor? (a) start a fan when hot (b) stop a robot near walls (c) keep an incubator warm (d) water a dry plant
37. 37.🔍 Which sensor would you use to warn of a gas leak? (a) a gas sensor (b) a motion sensor (c) a distance sensor (d) a sound sensor
38. 38.🔍 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
39. 39.Which job needs a motor? (a) turn to an exact angle (b) spin a robot’s wheels (c) open a gate to 90° (d) beep an alarm
40. 40.🔍 Which sensor would you use to make a parking alarm? (a) a temperature sensor (b) a rain sensor (c) a sound sensor (d) a distance sensor

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