Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 157 · 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 buzzer? (a) move water to plants (b) open a gate to 90° (c) beep an alarm (d) spin a robot’s wheels
2. 2.Which job needs a light sensor? (a) stop a robot near walls (b) start a fan when hot (c) water a dry plant (d) switch on lamps at dusk
3. 3.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a power source (c) a fuse (d) an output
4. 4.🔍 Which sensor would you use to make a parking alarm? (a) a rain sensor (b) a sound sensor (c) a light sensor (d) a distance sensor
5. 5.🔍 Which sensor would you use to switch on with a clap? (a) a distance sensor (b) a rain sensor (c) a sound sensor (d) a soil moisture sensor
6. 6.Which job needs a gas sensor? (a) start a fan when hot (b) warn of a gas leak (c) stop a robot near walls (d) open blinds at sunrise
7. 7.Which job needs a sound sensor? (a) close a window in rain (b) switch on with a clap (c) switch on lamps at dusk (d) water a dry plant
8. 8.🔍 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
9. 9.Which job needs a motor? (a) move water to plants (b) show a status light (c) show the temperature (d) spin a robot’s wheels
10. 10.Which job needs a motion sensor? (a) stop a robot near walls (b) measure classroom noise (c) spot someone walking in (d) warn of a gas leak
11. 11.🔍 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)?
12. 12.Which job needs a temperature sensor? (a) water a dry plant (b) switch on with a clap (c) start a fan when hot (d) measure classroom noise
13. 13.⚙️ Which actuator would you use to show a status light? (a) a motor (b) a buzzer (c) a servo motor (d) an LED
14. 14.🔍 Which sensor would you use to stop a robot near walls? (a) a light sensor (b) a motion sensor (c) a soil moisture sensor (d) a distance sensor
15. 15.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
16. 16.Which job needs a pump? (a) beep an alarm (b) show a status light (c) turn to an exact angle (d) move water to plants
17. 17.Which job needs a soil moisture sensor? (a) make a parking alarm (b) switch on lamps at dusk (c) water a dry plant (d) switch on with a clap
18. 18.🔍 Which sensor would you use to close a window in rain? (a) a light sensor (b) a temperature sensor (c) a gas sensor (d) a rain sensor
19. 19.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a pump (c) a buzzer (d) an LED
20. 20.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a rain sensor (c) a soil moisture sensor (d) a gas sensor
21. 21.🔍 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?
22. 22.⚙️ What is an actuator? (a) a program (b) an output that acts (c) a battery (d) a sensor
23. 23.Which job needs a rain sensor? (a) keep an incubator warm (b) spot someone walking in (c) close a window in rain (d) stop a robot near walls
24. 24.🔍 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
25. 25.True or false: to open blinds at sunrise, use a temperature sensor. (a) False (b) True
26. 26.Which job needs a distance sensor? (a) close a window in rain (b) water a dry plant (c) spot someone walking in (d) stop a robot near walls
27. 27.Which job needs a temperature sensor? (a) keep an incubator warm (b) open blinds at sunrise (c) switch on with a clap (d) close a window in rain
28. 28.⚙️ Which actuator would you use to move water to plants? (a) a buzzer (b) a pump (c) a servo motor (d) an LED
29. 29.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a gas sensor (c) a temperature sensor (d) a soil moisture sensor
30. 30.🔍 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
31. 31.Which job needs a display? (a) show the temperature (b) open a gate to 90° (c) turn to an exact angle (d) move water to plants
32. 32.🔍 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?
33. 33.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a distance sensor (c) a motion sensor (d) a sound sensor
34. 34.⚙️ Which actuator would you use to open a gate to 90°? (a) a pump (b) a motor (c) a servo motor (d) a buzzer
35. 35.🔍 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
36. 36.True or false: to stop a robot near walls, use a temperature sensor. (a) False (b) True
37. 37.True or false: to open blinds at sunrise, use a motion sensor. (a) False (b) True
38. 38.True or false: to start a fan when hot, use a motion sensor. (a) True (b) False
39. 39.🔍 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.🔍 Which sensor would you use to switch on lamps at dusk? (a) a gas sensor (b) a distance sensor (c) a light sensor (d) a motion sensor

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