Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 305 · 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 switch on lamps at dusk? (a) a light sensor (b) a distance sensor (c) a gas sensor (d) a motion sensor
2. 2.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a buzzer (c) a motor (d) a pump
3. 3.🔍 Which sensor would you use to warn of a gas leak? (a) a sound sensor (b) a gas sensor (c) a rain sensor (d) a light sensor
4. 4.⚙️ Which actuator would you use to show a status light? (a) a pump (b) a motor (c) a buzzer (d) an LED
5. 5.Which job needs a distance sensor? (a) keep an incubator warm (b) switch on lamps at dusk (c) stop a robot near walls (d) open blinds at sunrise
6. 6.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a servo motor (c) a pump (d) a motor
7. 7.Which job needs a display? (a) move water to plants (b) show the temperature (c) show a status light (d) open a gate to 90°
8. 8.🔍 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)?
9. 9.Which job needs an LED? (a) show a status light (b) open a gate to 90° (c) turn to an exact angle (d) show the temperature
10. 10.🔍 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?
11. 11.Which job needs a pump? (a) beep an alarm (b) move water to plants (c) turn to an exact angle (d) show the temperature
12. 12.🔍 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
13. 13.Which job needs a servo motor? (a) move water to plants (b) open a gate to 90° (c) spin a robot’s wheels (d) beep an alarm
14. 14.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) a fuse (c) an output (d) an input
15. 15.Which job needs a servo motor? (a) move water to plants (b) turn to an exact angle (c) spin a robot’s wheels (d) show the temperature
16. 16.True or false: to switch on with a clap, use a gas sensor. (a) False (b) True
17. 17.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a servo motor (c) a display (d) a motor
18. 18.⚙️ What is an actuator? (a) a sensor (b) a program (c) a battery (d) an output that acts
19. 19.Which job needs a motor? (a) move water to plants (b) turn to an exact angle (c) show the temperature (d) spin a robot’s wheels
20. 20.🔍 Which sensor would you use to start a fan when hot? (a) a gas sensor (b) a soil moisture sensor (c) a temperature sensor (d) a motion sensor
21. 21.Which job needs a sound sensor? (a) switch on with a clap (b) switch on lamps at dusk (c) warn of a gas leak (d) keep an incubator warm
22. 22.True or false: to start a fan when hot, use a light sensor. (a) True (b) False
23. 23.⚙️ Which actuator would you use to turn to an exact angle? (a) a display (b) a buzzer (c) a servo motor (d) a motor
24. 24.🔍 Which sensor would you use to switch on with a clap? (a) a motion sensor (b) a distance sensor (c) a sound sensor (d) a temperature sensor
25. 25.🔍 Which sensor would you use to make a parking alarm? (a) a temperature sensor (b) a gas sensor (c) a sound sensor (d) a distance sensor
26. 26.🔍 Which sensor would you use to close a window in rain? (a) a gas sensor (b) a soil moisture sensor (c) a rain sensor (d) a distance sensor
27. 27.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a buzzer (c) a motor (d) a display
28. 28.True or false: to measure classroom noise, use a soil moisture sensor. (a) True (b) False
29. 29.Which job needs a rain sensor? (a) water a dry plant (b) start a fan when hot (c) close a window in rain (d) make a parking alarm
30. 30.🔍 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
31. 31.Which job needs a light sensor? (a) close a window in rain (b) open blinds at sunrise (c) keep an incubator warm (d) switch on with a clap
32. 32.⚙️ Which actuator would you use to move water to plants? (a) a buzzer (b) an LED (c) a pump (d) a motor
33. 33.True or false: to start a fan when hot, use a gas sensor. (a) True (b) False
34. 34.🔍 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?
35. 35.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
36. 36.🔍 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
37. 37.True or false: to switch on with a clap, use a rain sensor. (a) True (b) False
38. 38.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
39. 39.🔍 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.🔍 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)?

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