Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 57 · 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 job needs a sound sensor? (a) make a parking alarm (b) measure classroom noise (c) switch on lamps at dusk (d) close a window in rain
2. 2.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an output (c) an input (d) a fuse
3. 3.True or false: to keep an incubator warm, use a gas sensor. (a) True (b) False
4. 4.⚙️ What is an actuator? (a) an output that acts (b) a battery (c) a sensor (d) a program
5. 5.🔍 Which sensor would you use to keep an incubator warm? (a) a light sensor (b) a sound sensor (c) a rain sensor (d) a temperature sensor
6. 6.🔍 Which sensor would you use to switch on lamps at dusk? (a) a light sensor (b) a sound sensor (c) a temperature sensor (d) a soil moisture sensor
7. 7.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) a buzzer (c) an LED (d) a pump
8. 8.🔍 Which sensor would you use to measure classroom noise? (a) a soil moisture sensor (b) a sound sensor (c) a light sensor (d) a gas sensor
9. 9.⚙️ Which actuator would you use to open a gate to 90°? (a) a display (b) a servo motor (c) a buzzer (d) an LED
10. 10.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) a display (c) an LED (d) a motor
11. 11.🔍 Which sensor would you use to water a dry plant? (a) a motion sensor (b) a soil moisture sensor (c) a light sensor (d) a rain sensor
12. 12.Which job needs a buzzer? (a) open a gate to 90° (b) turn to an exact angle (c) beep an alarm (d) show the temperature
13. 13.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
14. 14.🔍 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?
15. 15.Which job needs a light sensor? (a) water a dry plant (b) stop a robot near walls (c) make a parking alarm (d) open blinds at sunrise
16. 16.Which job needs a soil moisture sensor? (a) open blinds at sunrise (b) close a window in rain (c) start a fan when hot (d) water a dry plant
17. 17.Which job needs a servo motor? (a) show a status light (b) move water to plants (c) open a gate to 90° (d) beep an alarm
18. 18.Which job needs a pump? (a) move water to plants (b) beep an alarm (c) spin a robot’s wheels (d) open a gate to 90°
19. 19.🔍 Which sensor would you use to stop a robot near walls? (a) a motion sensor (b) a temperature sensor (c) a distance sensor (d) a soil moisture sensor
20. 20.Which job needs a distance sensor? (a) water a dry plant (b) warn of a gas leak (c) spot someone walking in (d) make a parking alarm
21. 21.🔍 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)?
22. 22.🔍 Which sensor would you use to warn of a gas leak? (a) a gas sensor (b) a temperature sensor (c) a distance sensor (d) a sound sensor
23. 23.True or false: to close a window in rain, use a distance sensor. (a) True (b) False
24. 24.🔍 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
25. 25.🔍 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
26. 26.Which job needs a temperature sensor? (a) water a dry plant (b) close a window in rain (c) start a fan when hot (d) warn of a gas leak
27. 27.True or false: to switch on lamps at dusk, use a gas sensor. (a) True (b) False
28. 28.Which job needs a motion sensor? (a) spot someone walking in (b) measure classroom noise (c) switch on with a clap (d) warn of a gas leak
29. 29.Which job needs a rain sensor? (a) make a parking alarm (b) switch on lamps at dusk (c) open blinds at sunrise (d) close a window in rain
30. 30.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
31. 31.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a distance sensor (c) a soil moisture sensor (d) a gas sensor
32. 32.🔍 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?
33. 33.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
34. 34.True or false: to measure classroom noise, use a distance sensor. (a) False (b) True
35. 35.Which job needs a sound sensor? (a) start a fan when hot (b) switch on with a clap (c) make a parking alarm (d) spot someone walking in
36. 36.⚙️ Which actuator would you use to beep an alarm? (a) a servo motor (b) a display (c) an LED (d) a buzzer
37. 37.Which job needs a motor? (a) beep an alarm (b) open a gate to 90° (c) spin a robot’s wheels (d) show the temperature
38. 38.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a display (c) a servo motor (d) a pump
39. 39.🔍 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
40. 40.🔍 An object is 255 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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