Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 209 · 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 make a parking alarm? (a) a distance sensor (b) a gas sensor (c) a soil moisture sensor (d) a temperature sensor
2. 2.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a motor (c) a buzzer (d) an LED
3. 3.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) a pump (c) a motor (d) an LED
4. 4.🔍 Which sensor would you use to switch on lamps at dusk? (a) a temperature sensor (b) a distance sensor (c) a sound sensor (d) a light sensor
5. 5.Which job needs a soil moisture sensor? (a) water a dry plant (b) close a window in rain (c) switch on lamps at dusk (d) spot someone walking in
6. 6.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a servo motor (c) a display (d) a pump
7. 7.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
8. 8.Which job needs an LED? (a) show a status light (b) spin a robot’s wheels (c) turn to an exact angle (d) show the temperature
9. 9.Which job needs a temperature sensor? (a) switch on lamps at dusk (b) spot someone walking in (c) start a fan when hot (d) close a window in rain
10. 10.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
11. 11.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
12. 12.🔍 Which sensor would you use to close a window in rain? (a) a distance sensor (b) a rain sensor (c) a gas sensor (d) a light sensor
13. 13.🔍 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
14. 14.🔍 Which sensor would you use to keep an incubator warm? (a) a gas sensor (b) a temperature sensor (c) a sound sensor (d) a motion sensor
15. 15.Which job needs a motion sensor? (a) water a dry plant (b) switch on with a clap (c) measure classroom noise (d) spot someone walking in
16. 16.🔍 An object is 289 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
17. 17.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a buzzer (c) a pump (d) a display
18. 18.Which job needs a light sensor? (a) switch on lamps at dusk (b) start a fan when hot (c) spot someone walking in (d) close a window in rain
19. 19.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a servo motor (c) a buzzer (d) a motor
20. 20.🔍 Which sensor would you use to stop a robot near walls? (a) a soil moisture sensor (b) a motion sensor (c) a distance sensor (d) a light sensor
21. 21.Which job needs a display? (a) show the temperature (b) turn to an exact angle (c) spin a robot’s wheels (d) show a status light
22. 22.🔍 Which sensor would you use to water a dry plant? (a) a light sensor (b) a gas sensor (c) a distance sensor (d) a soil moisture sensor
23. 23.⚙️ What is an actuator? (a) a sensor (b) a battery (c) a program (d) an output that acts
24. 24.Which job needs a gas sensor? (a) spot someone walking in (b) water a dry plant (c) warn of a gas leak (d) open blinds at sunrise
25. 25.🔍 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
26. 26.🔍 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?
27. 27.Which job needs a distance sensor? (a) water a dry plant (b) switch on lamps at dusk (c) warn of a gas leak (d) make a parking alarm
28. 28.🔍 Which sensor would you use to open blinds at sunrise? (a) a soil moisture sensor (b) a distance sensor (c) a light sensor (d) a sound sensor
29. 29.Which job needs a servo motor? (a) turn to an exact angle (b) show the temperature (c) spin a robot’s wheels (d) show a status light
30. 30.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
31. 31.🔍 Which sensor would you use to switch on with a clap? (a) a sound sensor (b) a light sensor (c) a distance sensor (d) a gas sensor
32. 32.Which job needs a motor? (a) show a status light (b) turn to an exact angle (c) show the temperature (d) spin a robot’s wheels
33. 33.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
34. 34.Which job needs a temperature sensor? (a) spot someone walking in (b) make a parking alarm (c) switch on with a clap (d) keep an incubator warm
35. 35.Which job needs a buzzer? (a) show the temperature (b) turn to an exact angle (c) show a status light (d) beep an alarm
36. 36.⚙️ Which actuator would you use to move water to plants? (a) a display (b) an LED (c) a pump (d) a servo motor
37. 37.Which job needs a rain sensor? (a) open blinds at sunrise (b) keep an incubator warm (c) close a window in rain (d) make a parking alarm
38. 38.True or false: to measure classroom noise, use a motion sensor. (a) True (b) False
39. 39.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) an input (c) a power source (d) a fuse
40. 40.🔍 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)?

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