Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 95 · 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.⚙️ What is an actuator? (a) a battery (b) a sensor (c) a program (d) an output that acts
2. 2.Which job needs a buzzer? (a) show a status light (b) move water to plants (c) beep an alarm (d) show the temperature
3. 3.Which job needs a servo motor? (a) beep an alarm (b) open a gate to 90° (c) spin a robot’s wheels (d) move water to plants
4. 4.Which job needs a temperature sensor? (a) warn of a gas leak (b) stop a robot near walls (c) water a dry plant (d) keep an incubator warm
5. 5.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an output (c) a power source (d) an input
6. 6.Which job needs a rain sensor? (a) keep an incubator warm (b) close a window in rain (c) open blinds at sunrise (d) switch on lamps at dusk
7. 7.Which job needs a motor? (a) show a status light (b) turn to an exact angle (c) spin a robot’s wheels (d) open a gate to 90°
8. 8.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a display (c) a servo motor (d) a pump
9. 9.🔍 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
10. 10.Which job needs a soil moisture sensor? (a) start a fan when hot (b) spot someone walking in (c) open blinds at sunrise (d) water a dry plant
11. 11.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) a display (c) a motor (d) an LED
12. 12.Which job needs a motion sensor? (a) switch on lamps at dusk (b) spot someone walking in (c) water a dry plant (d) start a fan when hot
13. 13.Which job needs a servo motor? (a) spin a robot’s wheels (b) move water to plants (c) show the temperature (d) turn to an exact angle
14. 14.Which job needs a distance sensor? (a) measure classroom noise (b) close a window in rain (c) stop a robot near walls (d) spot someone walking in
15. 15.⚙️ Which actuator would you use to show the temperature? (a) a motor (b) a servo motor (c) a display (d) an LED
16. 16.⚙️ Which actuator would you use to move water to plants? (a) a motor (b) a display (c) a servo motor (d) a pump
17. 17.🔍 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
18. 18.🔍 Which sensor would you use to make a parking alarm? (a) a soil moisture sensor (b) a sound sensor (c) a distance sensor (d) a gas sensor
19. 19.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
20. 20.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a motion sensor (c) a gas sensor (d) a sound sensor
21. 21.🔍 Which sensor would you use to spot someone walking in? (a) a light sensor (b) a motion sensor (c) a temperature sensor (d) a gas sensor
22. 22.🔍 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?
23. 23.🔍 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
24. 24.🔍 Which sensor would you use to measure classroom noise? (a) a rain sensor (b) a soil moisture sensor (c) a sound sensor (d) a gas sensor
25. 25.🔍 Which sensor would you use to close a window in rain? (a) a soil moisture sensor (b) a distance sensor (c) a sound sensor (d) a rain sensor
26. 26.Which job needs a pump? (a) show the temperature (b) beep an alarm (c) move water to plants (d) turn to an exact angle
27. 27.Which job needs a gas sensor? (a) water a dry plant (b) spot someone walking in (c) close a window in rain (d) warn of a gas leak
28. 28.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
29. 29.🔍 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?
30. 30.Which job needs a distance sensor? (a) measure classroom noise (b) switch on lamps at dusk (c) make a parking alarm (d) warn of a gas leak
31. 31.True or false: to keep an incubator warm, use a sound sensor. (a) True (b) False
32. 32.🔍 An object is 153 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 start a fan when hot, use a rain sensor. (a) False (b) True
34. 34.Which job needs a sound sensor? (a) open blinds at sunrise (b) switch on with a clap (c) stop a robot near walls (d) spot someone walking in
35. 35.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a pump (c) a motor (d) an LED
36. 36.🔍 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?
37. 37.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) a display (c) a buzzer (d) an LED
38. 38.🔍 Which sensor would you use to warn of a gas leak? (a) a gas sensor (b) a sound sensor (c) a motion sensor (d) a light sensor
39. 39.🔍 Which sensor would you use to switch on lamps at dusk? (a) a temperature sensor (b) a gas sensor (c) a rain sensor (d) a light sensor
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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