Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 47 · 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 measure classroom noise? (a) a soil moisture sensor (b) a gas sensor (c) a motion sensor (d) a sound 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) show the temperature
3. 3.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) a motor (c) a servo motor (d) an LED
4. 4.Which job needs a motion sensor? (a) spot someone walking in (b) switch on with a clap (c) start a fan when hot (d) open blinds at sunrise
5. 5.Which job needs a motor? (a) open a gate to 90° (b) show a status light (c) beep an alarm (d) spin a robot’s wheels
6. 6.Which job needs a display? (a) open a gate to 90° (b) show a status light (c) show the temperature (d) move water to plants
7. 7.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a pump (c) a servo motor (d) an LED
8. 8.⚙️ What is an actuator? (a) an output that acts (b) a program (c) a battery (d) a sensor
9. 9.Which job needs a sound sensor? (a) keep an incubator warm (b) measure classroom noise (c) spot someone walking in (d) open blinds at sunrise
10. 10.Which job needs a light sensor? (a) spot someone walking in (b) close a window in rain (c) switch on lamps at dusk (d) keep an incubator warm
11. 11.🔍 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)?
12. 12.🔍 Which sensor would you use to close a window in rain? (a) a sound sensor (b) a motion sensor (c) a light sensor (d) a rain sensor
13. 13.Which job needs a temperature sensor? (a) spot someone walking in (b) warn of a gas leak (c) switch on with a clap (d) keep an incubator warm
14. 14.Which job needs a rain sensor? (a) close a window in rain (b) open blinds at sunrise (c) switch on with a clap (d) switch on lamps at dusk
15. 15.Which job needs a gas sensor? (a) spot someone walking in (b) measure classroom noise (c) warn of a gas leak (d) keep an incubator warm
16. 16.🔍 Which sensor would you use to keep an incubator warm? (a) a soil moisture sensor (b) a distance sensor (c) a temperature sensor (d) a rain sensor
17. 17.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
18. 18.🔍 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)?
19. 19.Which job needs a pump? (a) show the temperature (b) beep an alarm (c) move water to plants (d) turn to an exact angle
20. 20.True or false: to open blinds at sunrise, use a sound sensor. (a) False (b) True
21. 21.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a sound sensor (c) a rain sensor (d) a temperature sensor
22. 22.🔍 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?
23. 23.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a motor (c) a servo motor (d) an LED
24. 24.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a servo motor (c) a pump (d) a display
25. 25.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
26. 26.🔍 Which sensor would you use to warn of a gas leak? (a) a sound sensor (b) a gas sensor (c) a distance sensor (d) a rain sensor
27. 27.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an output (c) a fuse (d) an input
28. 28.🔍 Which sensor would you use to start a fan when hot? (a) a motion sensor (b) a temperature sensor (c) a distance sensor (d) a sound sensor
29. 29.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
30. 30.Which job needs a soil moisture sensor? (a) start a fan when hot (b) open blinds at sunrise (c) water a dry plant (d) stop a robot near walls
31. 31.True or false: to start a fan when hot, use a light sensor. (a) False (b) True
32. 32.Which job needs a buzzer? (a) open a gate to 90° (b) show the temperature (c) beep an alarm (d) turn to an exact angle
33. 33.🔍 Which sensor would you use to switch on with a clap? (a) a soil moisture sensor (b) a temperature sensor (c) a light sensor (d) a sound sensor
34. 34.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
35. 35.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
36. 36.🔍 Which sensor would you use to water a dry plant? (a) a soil moisture sensor (b) a light sensor (c) a gas sensor (d) a temperature sensor
37. 37.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
38. 38.Which job needs a servo motor? (a) show the temperature (b) show a status light (c) move water to plants (d) open a gate to 90°
39. 39.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a display (c) a buzzer (d) a pump
40. 40.🔍 An object is 340 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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